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López-Goldar X, Mollema A, Sivak-Schwennesen C, Havko N, Howe G, Agrawal AA, Wetzel WC. Heat waves induce milkweed resistance to a specialist herbivore via increased toxicity and reduced nutrient content. PLANT, CELL & ENVIRONMENT 2024; 47:4530-4542. [PMID: 39011992 DOI: 10.1111/pce.15040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 06/08/2024] [Accepted: 07/06/2024] [Indexed: 07/17/2024]
Abstract
Over the last decade, a large effort has been made to understand how extreme climate events disrupt species interactions. Yet, it is unclear how these events affect plants and herbivores directly, via metabolic changes, and indirectly, via their subsequent altered interaction. We exposed common milkweed (Asclepias syriaca) and monarch caterpillars (Danaus plexippus) to control (26:14°C, day:night) or heat wave (HW) conditions (36:24°C, day:night) for 4 days and then moved each organism to a new control or HW partner to disentangle the direct and indirect effects of heat exposure on each organism. We found that the HW directly benefited plants in terms of growth and defence expression (increased latex exudation and total cardenolides) and insect her'bivores through faster larval development. Conversely, indirect HW effects caused both plant latex and total cardenolides to decrease after subsequent herbivory. Nonetheless, increasing trends of more toxic cardenolides and lower leaf nutritional quality after herbivory by HW caterpillars likely led to reduced plant damage compared to controls. Our findings reveal that indirect impacts of HWs may play a greater role in shaping plant-herbivore interactions via changes in key physiological traits, providing valuable understanding of how ecological interactions may proceed in a changing world.
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Affiliation(s)
- Xosé López-Goldar
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana, USA
- Department of Entomology, Michigan State University, East Lansing, Michigan, USA
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan, USA
| | - Alyssa Mollema
- Department of Entomology, Michigan State University, East Lansing, Michigan, USA
| | | | - Nathan Havko
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan, USA
| | - Gregg Howe
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan, USA
| | - Anurag A Agrawal
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA
| | - William C Wetzel
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, Montana, USA
- Department of Entomology, Michigan State University, East Lansing, Michigan, USA
- Department of Integrative Biology, Michigan State University, East Lansing, Michigan, USA
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2
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Zhao YJ, Wang S, Liao ZY, Parepa M, Zhang L, Cao P, Bi J, Guo Y, Bossdorf O, Richards CL, Wu J, Li B, Ju RT. Geographic variation in leaf traits and palatability of a native plant invader during domestic expansion. Ecology 2024; 105:e4425. [PMID: 39311032 DOI: 10.1002/ecy.4425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Accepted: 07/18/2024] [Indexed: 11/05/2024]
Abstract
Like alien plant invasion, range expansion of native plants may threaten biodiversity and economies, rendering them native invaders. Variation in abiotic and biotic conditions across a large geographic scale greatly affects variation in traits and interactions with herbivores of native plant invaders, which is an interesting yet mostly unexplored issue. We used a common garden experiment to compare defensive/nutritional traits and palatability to generalist herbivores of 20 native (23.64° N-30.18° N) and introduced range (31.58° N-36.87° N) populations of Reynoutria japonica, which is a native invader following range expansion in China. We analyzed the relationships among herbivore pressure, climate, plant chloroplast haplotypes, leaf traits, and herbivore performance. Of the 16 variables tested, we observed range differences in 11 variables and latitudinal clines in nine variables. In general, herbivores performed better on the introduced plants than on the native plants, and better on the high-latitude plants than on the low-latitude plants within the introduced populations. Three key traits (leaf thickness, specific leaf area, and carbon-to-nitrogen [C:N] ratio) determined palatability to herbivores and were significantly associated with temperature and/or precipitation of plant provenance as well as with plant haplotypes but not with herbivore pressure. Our results revealed a causal sequence from plant-range-based environmental forces and genetic context to plant quality and palatability to herbivores in R. japonica. These findings suggest a post-introduction evolution of R. japonica, which may partly explain the colonization success of this important native, but invasive plant.
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Affiliation(s)
- Yu-Jie Zhao
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
| | - Shengyu Wang
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
| | - Zhi-Yong Liao
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China
| | - Madalin Parepa
- Plant Evolutionary Ecology, Institute of Evolution and Ecology, University of Tübingen, Tübingen, Germany
| | - Lei Zhang
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
| | - Peipei Cao
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
| | - Jingwen Bi
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
| | - Yaolin Guo
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
| | - Oliver Bossdorf
- Plant Evolutionary Ecology, Institute of Evolution and Ecology, University of Tübingen, Tübingen, Germany
| | - Christina L Richards
- Plant Evolutionary Ecology, Institute of Evolution and Ecology, University of Tübingen, Tübingen, Germany
- Department of Integrative Biology, University of South Florida, Tampa, Florida, USA
| | - Jihua Wu
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
- State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, College of Ecology, Lanzhou University, Lanzhou, China
| | - Bo Li
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
| | - Rui-Ting Ju
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, China
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3
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Li Y, Liu Q, Zhang X, Mao B, Yang G, Shi F, Bi J, Ma Z, Tang G. Effects of Environmental Factors on the Diversity of Grasshopper Communities along Altitude Gradients in Xizang, China. INSECTS 2024; 15:671. [PMID: 39336639 PMCID: PMC11432001 DOI: 10.3390/insects15090671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2024] [Revised: 08/24/2024] [Accepted: 08/30/2024] [Indexed: 09/30/2024]
Abstract
To determine the grasshopper species composition, altitudinal distribution patterns, and their main drivers, we conducted a study in Xizang using 33 sample plots ranging from 600 to 4100 m. Grasshoppers were collected from August to October during 2020-2022 using sweep nets. A total of 1159 grasshoppers from six families, 28 genera, and 44 species were identified, with Omocestus cuonaensis and Aserratus eminifrontus as the dominant species, comprising 30.03% and 10.26% of total grasshoppers, respectively. The results showed that species richness and the Margalef richness index of grasshopper communities decreased significantly (p < 0.05) with increasing altitude, peaking at 1100-1600 m and lowest values at 2600-3100 m. Similarly, the Shannon-Wiener index and Simpson dominance index also decreased significantly (p < 0.05) with an increase in altitude, showing the highest and lowest values at 600-1100 m and 3100-3600 m, respectively. The Jaccard similarity coefficients among grasshopper communities varied from 0 to 0.40 across altitudinal gradients, indicating different degrees of dissimilarity. The results of Pearson correlation analyses showed that the Shannon-Wiener index, species richness, Margalef richness index, and Simpson dominance index of grasshopper communities were significantly negatively correlated with the temperature factors and soil pH, but they were significantly positively correlated with the moisture factors. Hierarchical partitioning identified annual mean temperature-daily difference, precipitation in the coldest season, and driest month precipitation as the primary factors explaining variance in grasshopper community diversity in Xizang. These findings provided greater insights into the mechanisms underlying insect community structure, distribution patterns, and diversity in Xizang ecosystems, including implications for the effects of global warming on insect communities.
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Affiliation(s)
- Yonghui Li
- Research Institute of Gaoligong Mountains, Baoshan University, Key Laboratory of Conservation and Utilization of Insect Resources in Western Yunnan, Baoshan 678000, China
- Baoshan Key Laboratory of Biodiversity Conservation and Utilization of Gaoligong Mountains, Baoshan 678000, China
- College of Plant Protection, Yunnan Agricultural University, National Key Laboratory for Conservation and Utilization of Biological Resources in Yunnan, Kunming 650201, China
| | - Qing Liu
- Research Institute of Gaoligong Mountains, Baoshan University, Key Laboratory of Conservation and Utilization of Insect Resources in Western Yunnan, Baoshan 678000, China
- Baoshan Key Laboratory of Biodiversity Conservation and Utilization of Gaoligong Mountains, Baoshan 678000, China
| | - Xiaoming Zhang
- College of Plant Protection, Yunnan Agricultural University, National Key Laboratory for Conservation and Utilization of Biological Resources in Yunnan, Kunming 650201, China
| | - Benyong Mao
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Guohui Yang
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Fuming Shi
- School of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding 071002, China
| | - Jingui Bi
- Research Institute of Gaoligong Mountains, Baoshan University, Key Laboratory of Conservation and Utilization of Insect Resources in Western Yunnan, Baoshan 678000, China
| | - Zhibin Ma
- Research Institute of Gaoligong Mountains, Baoshan University, Key Laboratory of Conservation and Utilization of Insect Resources in Western Yunnan, Baoshan 678000, China
| | - Guowen Tang
- College of Plant Protection, Yunnan Agricultural University, National Key Laboratory for Conservation and Utilization of Biological Resources in Yunnan, Kunming 650201, China
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Freedman MG, Long RW, Ramírez SR, Strauss SY. Evidence for Reductions in Physical and Chemical Plant Defense Traits in Island Flora. PLANTS (BASEL, SWITZERLAND) 2024; 13:1026. [PMID: 38611555 PMCID: PMC11013342 DOI: 10.3390/plants13071026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Revised: 03/28/2024] [Accepted: 03/29/2024] [Indexed: 04/14/2024]
Abstract
Reduced defense against large herbivores has been suggested to be part of the "island syndrome" in plants. However, empirical evidence for this pattern is mixed. In this paper, we present two studies that compare putative physical and chemical defense traits from plants on the California Channel Islands and nearby mainland based on sampling of both field and common garden plants. In the first study, we focus on five pairs of woody shrubs from three island and three mainland locations and find evidence for increased leaf area, decreased marginal leaf spines, and decreased concentrations of cyanogenic glycosides in island plants. We observed similar increases in leaf area and decreases in defense traits when comparing island and mainland genotypes grown together in botanic gardens, suggesting that trait differences are not solely driven by abiotic differences between island and mainland sites. In the second study, we conducted a common garden experiment with a perennial herb-Stachys bullata (Lamiaceae)-collected from two island and four mainland locations. Compared to their mainland relatives, island genotypes show highly reduced glandular trichomes and a nearly 100-fold reduction in mono- and sesquiterpene compounds from leaf surfaces. Island genotypes also had significantly higher specific leaf area, somewhat lower rates of gas exchange, and greater aboveground biomass than mainland genotypes across two years of study, potentially reflecting a broader shift in growth habit. Together, our results provide evidence for reduced expression of putative defense traits in island plants, though these results may reflect adaptation to both biotic (i.e., the historical absence of large herbivores) and climatic conditions on islands.
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Affiliation(s)
- Micah G. Freedman
- Center for Population Biology, University of California, Davis, CA 95616, USA
- Department of Evolution and Ecology, University of California, Davis, CA 95616, USA
| | - Randall W. Long
- Department of Biology, Lewis & Clark College, Portland, OR 97219, USA
| | - Santiago R. Ramírez
- Center for Population Biology, University of California, Davis, CA 95616, USA
- Department of Evolution and Ecology, University of California, Davis, CA 95616, USA
| | - Sharon Y. Strauss
- Center for Population Biology, University of California, Davis, CA 95616, USA
- Department of Evolution and Ecology, University of California, Davis, CA 95616, USA
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5
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Agrawal AA, Hastings AP, Duplais C. Testing the selective sequestration hypothesis: Monarch butterflies preferentially sequester plant defences that are less toxic to themselves while maintaining potency to others. Ecol Lett 2024; 27:e14340. [PMID: 38017619 DOI: 10.1111/ele.14340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 10/08/2023] [Accepted: 10/23/2023] [Indexed: 11/30/2023]
Abstract
Herbivores that sequester toxins are thought to have cracked the code of plant defences. Nonetheless, coevolutionary theory predicts that plants should evolve toxic variants that also negatively impact specialists. We propose and test the selective sequestration hypothesis, that specialists preferentially sequester compounds that are less toxic to themselves while maintaining toxicity to enemies. Using chemically distinct plants, we show that monarch butterflies sequester only a subset of cardenolides from milkweed leaves that are less potent against their target enzyme (Na+ /K+ -ATPase) compared to several dominant cardenolides from leaves. However, sequestered compounds remain highly potent against sensitive Na+ /K+ -ATPases found in most predators. We confirmed this differential toxicity with mixtures of purified cardenolides from leaves and butterflies. The genetic basis of monarch adaptation to sequestered cardenolides was also confirmed with transgenic Drosophila that were CRISPR-edited with the monarch's Na+ /K+ -ATPase. Thus, the monarch's selective sequestration appears to reduce self-harm while maintaining protection from enemies.
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Affiliation(s)
- Anurag A Agrawal
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA
- Department of Entomology, Cornell University, Ithaca, New York, USA
| | - Amy P Hastings
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA
| | - Christophe Duplais
- Department of Entomology, Cornell AgriTech, Cornell University, Geneva, New York, USA
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6
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Headrick KC, Juenger TE, Heckman RW. Plant physical defenses contribute to a latitudinal gradient in resistance to insect herbivory within a widespread perennial grass. AMERICAN JOURNAL OF BOTANY 2024; 111:e16260. [PMID: 38031482 DOI: 10.1002/ajb2.16260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 10/23/2023] [Accepted: 10/24/2023] [Indexed: 12/01/2023]
Abstract
PREMISE Herbivore pressure can vary across the range of a species, resulting in different defensive strategies. If herbivory is greater at lower latitudes, plants may be better defended there, potentially driving a latitudinal gradient in defense. However, relationships that manifest across the entire range of a species may be confounded by differences within genetic subpopulations, which may obscure the drivers of these latitudinal gradients. METHODS We grew plants of the widespread perennial grass Panicum virgatum in a common garden that included genotypes from three genetic subpopulations spanning an 18.5° latitudinal gradient. We then assessed defensive strategies of these plants by measuring two physical resistance traits-leaf mass per area (LMA) and leaf ash, a proxy for silica-and multiple measures of herbivory by caterpillars of the generalist herbivore fall armyworm (Spodoptera frugiperda). RESULTS Across all genetic subpopulations, low-latitude plants experienced less herbivory than high-latitude plants. Within genetic subpopulations, however, this relationship was inconsistent-the most widely distributed and phenotypically variable subpopulation (Atlantic) exhibited more consistent latitudinal trends than either of the other two subpopulations. The two physical resistance traits, LMA and leaf ash, were both highly heritable and positively associated with resistance to different measures of herbivory across all subpopulations, indicating their importance in defense against herbivores. Again, however, these relationships were inconsistent within subpopulations. CONCLUSIONS Defensive gradients that occur across the entire species range may not arise within localized subpopulations. Thus, identifying the drivers of latitudinal gradients in herbivory defense may depend on adequately sampling the diversity within a species.
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Affiliation(s)
- Kevin C Headrick
- Department of Integrative Biology, University of Texas at Austin, Austin, TX, 78712, USA
| | - Thomas E Juenger
- Department of Integrative Biology, University of Texas at Austin, Austin, TX, 78712, USA
| | - Robert W Heckman
- Department of Integrative Biology, University of Texas at Austin, Austin, TX, 78712, USA
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7
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Robinson ML, Hahn PG, Inouye BD, Underwood N, Whitehead SR, Abbott KC, Bruna EM, Cacho NI, Dyer LA, Abdala-Roberts L, Allen WJ, Andrade JF, Angulo DF, Anjos D, Anstett DN, Bagchi R, Bagchi S, Barbosa M, Barrett S, Baskett CA, Ben-Simchon E, Bloodworth KJ, Bronstein JL, Buckley YM, Burghardt KT, Bustos-Segura C, Calixto ES, Carvalho RL, Castagneyrol B, Chiuffo MC, Cinoğlu D, Cinto Mejía E, Cock MC, Cogni R, Cope OL, Cornelissen T, Cortez DR, Crowder DW, Dallstream C, Dáttilo W, Davis JK, Dimarco RD, Dole HE, Egbon IN, Eisenring M, Ejomah A, Elderd BD, Endara MJ, Eubanks MD, Everingham SE, Farah KN, Farias RP, Fernandes AP, Fernandes GW, Ferrante M, Finn A, Florjancic GA, Forister ML, Fox QN, Frago E, França FM, Getman-Pickering AS, Getman-Pickering Z, Gianoli E, Gooden B, Gossner MM, Greig KA, Gripenberg S, Groenteman R, Grof-Tisza P, Haack N, Hahn L, Haq SM, Helms AM, Hennecke J, Hermann SL, Holeski LM, Holm S, Hutchinson MC, Jackson EE, Kagiya S, Kalske A, Kalwajtys M, Karban R, Kariyat R, Keasar T, Kersch-Becker MF, Kharouba HM, Kim TN, Kimuyu DM, Kluse J, Koerner SE, Komatsu KJ, Krishnan S, Laihonen M, Lamelas-López L, LaScaleia MC, Lecomte N, Lehn CR, Li X, Lindroth RL, LoPresti EF, Losada M, Louthan AM, Luizzi VJ, Lynch SC, Lynn JS, Lyon NJ, Maia LF, Maia RA, Mannall TL, Martin BS, Massad TJ, McCall AC, McGurrin K, Merwin AC, Mijango-Ramos Z, Mills CH, Moles AT, Moore CM, Moreira X, Morrison CR, Moshobane MC, Muola A, Nakadai R, Nakajima K, Novais S, Ogbebor CO, Ohsaki H, Pan VS, Pardikes NA, Pareja M, Parthasarathy N, Pawar RR, Paynter Q, Pearse IS, Penczykowski RM, Pepi AA, Pereira CC, Phartyal SS, Piper FI, Poveda K, Pringle EG, Puy J, Quijano T, Quintero C, Rasmann S, Rosche C, Rosenheim LY, Rosenheim JA, Runyon JB, Sadeh A, Sakata Y, Salcido DM, Salgado-Luarte C, Santos BA, Sapir Y, Sasal Y, Sato Y, Sawant M, Schroeder H, Schumann I, Segoli M, Segre H, Shelef O, Shinohara N, Singh RP, Smith DS, Sobral M, Stotz GC, Tack AJM, Tayal M, Tooker JF, Torrico-Bazoberry D, Tougeron K, Trowbridge AM, Utsumi S, Uyi O, Vaca-Uribe JL, Valtonen A, van Dijk LJA, Vandvik V, Villellas J, Waller LP, Weber MG, Yamawo A, Yim S, Zarnetske PL, Zehr LN, Zhong Z, Wetzel WC. Plant size, latitude, and phylogeny explain within-population variability in herbivory. Science 2023; 382:679-683. [PMID: 37943897 DOI: 10.1126/science.adh8830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Accepted: 09/27/2023] [Indexed: 11/12/2023]
Abstract
Interactions between plants and herbivores are central in most ecosystems, but their strength is highly variable. The amount of variability within a system is thought to influence most aspects of plant-herbivore biology, from ecological stability to plant defense evolution. Our understanding of what influences variability, however, is limited by sparse data. We collected standardized surveys of herbivory for 503 plant species at 790 sites across 116° of latitude. With these data, we show that within-population variability in herbivory increases with latitude, decreases with plant size, and is phylogenetically structured. Differences in the magnitude of variability are thus central to how plant-herbivore biology varies across macroscale gradients. We argue that increased focus on interaction variability will advance understanding of patterns of life on Earth.
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Affiliation(s)
- M L Robinson
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Department of Biology, Utah State University, Logan, UT, USA
| | - P G Hahn
- Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
| | - B D Inouye
- Department of Biological Science, Florida State University, Tallahassee, FL, USA
| | - N Underwood
- Department of Biological Science, Florida State University, Tallahassee, FL, USA
| | - S R Whitehead
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
| | - K C Abbott
- Department of Biology, Case Western Reserve University, Cleveland, OH, USA
| | - E M Bruna
- Center for Latin American Studies, University of Florida, Gainesville, FL, USA
- Department of Wildlife Ecology and Conservation, University of Florida, Gainesville, FL, USA
| | - N I Cacho
- Instituto de Biología, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - L A Dyer
- Biology Department, University of Nevada, Reno, Reno, NV, USA
| | - L Abdala-Roberts
- Departamento de Ecología Tropical, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - W J Allen
- Bio-Protection Research Centre, University of Canterbury, Christchurch, New Zealand
| | - J F Andrade
- Departamento de Sistemática e Ecologia Universidade Federal da Paraíba, João Pessoa, Brazil
| | - D F Angulo
- Centro de Investigación Científica de Yucatán, Departamento de Recursos Naturales, Mérida, Yucatán, México
| | - D Anjos
- Instituto de Biologia, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil
| | - D N Anstett
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Plant Resilience Institute, Michigan State University, East Lansing, MI, USA
- Department of Plant Biology, Michigan State University, East Lansing, MI, USA
| | - R Bagchi
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA
| | - S Bagchi
- Centre for Ecological Sciences, Indian Institute of Science, Bangalore, Karnataka, India
| | - M Barbosa
- Department of Genetics, Ecology and Evolution, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - S Barrett
- Department of Biodiversity Conservation & Attractions Western Australia, Albany, Western Australia, Australia
| | - C A Baskett
- Institute of Science and Technology Austria, Klosterneuburg, Austria
| | - E Ben-Simchon
- Department of Natural Resources, Institute of Plant Sciences, Agricultural Research Organization - Volcani Institute, Rishon Le Tzion, Israel
- Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - K J Bloodworth
- Department of Biology, University of North Carolina Greensboro, Greensboro, NC, USA
| | - J L Bronstein
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA
| | - Y M Buckley
- School of Natural Sciences, Zoology, Trinity College Dublin, Dublin, Ireland
| | - K T Burghardt
- Department of Entomology, University of Maryland, College Park, MD, USA
| | - C Bustos-Segura
- Institute of Biology, University of Neuchatel, Neuchatel, Switzerland
| | - E S Calixto
- Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
| | - R L Carvalho
- Institute of Advanced Studies, University of São Paulo, São Paulo, Brazil
| | | | - M C Chiuffo
- Grupo de Ecología de Invasiones, INIBIOMA, Universidad Nacional del Comahue, CONICET, San Carlos de Bariloche, Río Negro, Argentina
| | - D Cinoğlu
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX, USA
| | - E Cinto Mejía
- Department of Entomology, Michigan State University, East Lansing, MI, USA
| | - M C Cock
- Facultad de Ciencias Exactas y Naturales, Instituto de Ciencias de la Tierra y Ambientales de La Pampa, Santa Rosa, La Pampa, Argentina
| | - R Cogni
- Department of Ecology, University of São Paulo, São Paulo, Brazil
| | - O L Cope
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Department of Biology, Whitworth University, Spokane, WA, USA
| | - T Cornelissen
- Department of Genetics, Ecology and Evolution, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - D R Cortez
- Department of Biology, California State University San Bernardino, San Bernardino, CA, USA
| | - D W Crowder
- Department of Entomology, Washington State University, Pullman, WA, USA
| | - C Dallstream
- Department of Biology, McGill University, Montreal, Quebec, Canada
| | - W Dáttilo
- Red de Ecoetología, Instituto de Ecología AC, Xalapa, Veracruz, Mexico
| | - J K Davis
- Department of Entomology, Cornell University, Ithaca, NY, USA
| | - R D Dimarco
- Department of Biology and Biochemistry, University of Houston, Houston, TX, USA
- Grupo de Ecología de Poblaciones de Insectos, IFAB, San Carlos de Bariloche, Río Negro, Argentina
| | - H E Dole
- Department of Entomology, Michigan State University, East Lansing, MI, USA
| | - I N Egbon
- Department of Animal and Environmental Biology, University of Benin, Benin City, Nigeria
| | - M Eisenring
- Forest Entomology, Swiss Federal Research Institute WSL, Birmensdorf, Switzerland
| | - A Ejomah
- Department of Animal and Environmental Biology, University of Benin, Benin City, Nigeria
| | - B D Elderd
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - M-J Endara
- Grupo de Investigación en Ecología y Evolución en los Trópicos-EETROP, Universidad de las Américas, Quito, Ecuador
| | - M D Eubanks
- Department of Entomology, Texas A&M University, College Station, TX, USA
| | - S E Everingham
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
- Evolution & Ecology Research Centre, University of New South Wales Sydney, Sydney, Australia
| | - K N Farah
- Department of Biology, Washington University in St. Louis, St. Louis, MO, USA
| | - R P Farias
- Instituto de Biologia, Universidade Federal da Bahia, Salvador, Bahia, Brasil
| | - A P Fernandes
- Department of Botany, Ganpat Parsekar College of Education Harmal, Pernem, Goa, India
| | - G W Fernandes
- Department of Genetics, Ecology and Evolution, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
- Knowledge Center for Biodiversity, Brazil
| | - M Ferrante
- Faculty of Agricultural Sciences and Environment, University of the Azores, Ponta Delgada, Portugal
- Department of Crop Sciences, University of Göttingen, Göttingen, Germany
| | - A Finn
- School of Natural Sciences, Zoology, Trinity College Dublin, Dublin, Ireland
| | - G A Florjancic
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
| | - M L Forister
- Biology Department, University of Nevada, Reno, Reno, NV, USA
| | - Q N Fox
- Department of Biology, Washington University in St. Louis, St. Louis, MO, USA
| | - E Frago
- CIRAD, UMR CBGP, INRAE, Institut Agro, IRD, Université Montpellier, Montpellier, France
| | - F M França
- School of Biological Sciences, University of Bristol, Bristol, UK
- Programa de Pós-Graduação em Ecologia, Universidade Federal do Pará, Belém, Pará, Brasil
| | | | - Z Getman-Pickering
- Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, MA, USA
| | - E Gianoli
- Departamento de Biología, Universidad de La Serena, La Serena, Chile
| | - B Gooden
- CSIRO Black Mountain Laboratories, CSIRO Health and Biosecurity, Canberra, Australia
| | - M M Gossner
- Forest Entomology, Swiss Federal Research Institute WSL, Birmensdorf, Switzerland
- Institute of Terrestrial Ecosystems, Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland
| | - K A Greig
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX, USA
| | - S Gripenberg
- School of Biological Sciences, University of Reading, Reading, UK
| | - R Groenteman
- Manaaki Whenua - Landcare Research, Lincoln, New Zealand
| | - P Grof-Tisza
- Institute of Biology, University of Neuchatel, Neuchatel, Switzerland
| | - N Haack
- Independent Institute for Environmental Issues, Halle, Germany
| | - L Hahn
- Molecular Evolution and Systematics of Animals, University of Leipzig, Leipzig, Germany
| | - S M Haq
- Wildlife Crime Control Division, Wildlife Trust of India, Noida, Uttar Pradesh, India
| | - A M Helms
- Department of Entomology, Texas A&M University, College Station, TX, USA
| | - J Hennecke
- Systematic Botany and Functional Biodiversity, Leipzig University, Leipzig, Germany
- German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany
| | - S L Hermann
- Department of Entomology, The Pennsylvania State University, University Park, PA, USA
| | - L M Holeski
- Department of Biological Sciences and Center for Adaptive Western Landscapes, Northern Arizona University, Flagstaff, AZ, USA
| | - S Holm
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
- Department of Zoology, University of Tartu, Tartu, Estonia
| | - M C Hutchinson
- Department of Life and Environmental Sciences, University of California, Merced, Merced, CA, USA
| | - E E Jackson
- School of Biological Sciences, University of Reading, Reading, UK
| | - S Kagiya
- Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, Hokkaido, Japan
| | - A Kalske
- Department of Biology, University of Turku, Turku, Finland
| | - M Kalwajtys
- Department of Entomology, Michigan State University, East Lansing, MI, USA
| | - R Karban
- Department of Entomology and Nematology, University of California Davis, Davis, CA, USA
| | - R Kariyat
- Department of Entomology and Plant Pathology, University of Arkansas, Fayetteville, AR, USA
| | - T Keasar
- Department of Biology and the Environment, University of Haifa - Oranim, Oranim, Tivon, Israel
| | - M F Kersch-Becker
- Department of Entomology, The Pennsylvania State University, University Park, PA, USA
| | - H M Kharouba
- Department of Biology, University of Ottawa, Ottawa, Ontario, Canada
| | - T N Kim
- Department of Entomology, Kansas State University, Manhattan, KS, USA
| | - D M Kimuyu
- Department of Natural Resources, Karatina University, Karatina, Kenya
| | - J Kluse
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - S E Koerner
- Department of Biology, University of North Carolina Greensboro, Greensboro, NC, USA
| | - K J Komatsu
- Department of Biology, University of North Carolina Greensboro, Greensboro, NC, USA
- Smithsonian Environmental Research Center, Edgewater, MD, USA
| | - S Krishnan
- Center for Sustainable Future, Amrita University and EIACP RP, Amrita Viswa Vidyapeetham, Coimbatore, India
| | - M Laihonen
- Biodiversity Unit, University of Turku, Turku, Finland
| | - L Lamelas-López
- Faculty of Agricultural Sciences and Environment, University of the Azores, Ponta Delgada, Portugal
| | - M C LaScaleia
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA
| | - N Lecomte
- Canada Research Chair in Polar and Boreal Ecology, Department of Biology and Centre d'Études Nordiques, Université de Moncton, Moncton, Canada
| | - C R Lehn
- Biological Sciences Course, Instituto Federal Farroupilha, Panambi, RS, Brazil
| | - X Li
- College of Resources and Environmental sciences, Jilin Agricultural University, Changchun, China
| | - R L Lindroth
- Department of Entomology, University of Wisconsin-Madison, Madison, WI, USA
| | - E F LoPresti
- Department of Biological Sciences, University of South Carolina, Columbia, SC, USA
| | - M Losada
- Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain
| | - A M Louthan
- Division of Biology, Kansas State University, Manhattan, KS, USA
| | - V J Luizzi
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA
| | - S C Lynch
- Division of Biology, Kansas State University, Manhattan, KS, USA
| | - J S Lynn
- Department of Biological Sciences, University of Bergen, Bergen, Norway
- Department of Earth and Environmental Sciences, University of Manchester, Manchester, UK
| | - N J Lyon
- Department of Entomology, Michigan State University, East Lansing, MI, USA
| | - L F Maia
- Bio-Protection Research Centre, University of Canterbury, Christchurch, New Zealand
- School of Biological Sciences, University of Bristol, Bristol, UK
| | - R A Maia
- Department of Genetics, Ecology and Evolution, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - T L Mannall
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
| | - B S Martin
- Department of Plant Biology, Michigan State University, East Lansing, MI, USA
- Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, MI, USA
| | - T J Massad
- Department of Scientific Services, Gorongosa National Park, Sofala, Mozambique
| | - A C McCall
- Biology Department, Denison University, Granville, OH, USA
| | - K McGurrin
- Department of Entomology, University of Maryland, College Park, MD, USA
| | - A C Merwin
- Department of Biology and Geology, Baldwin Wallace University, Berea, OH, USA
| | - Z Mijango-Ramos
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX, USA
| | - C H Mills
- Evolution & Ecology Research Centre, University of New South Wales Sydney, Sydney, Australia
| | - A T Moles
- Evolution & Ecology Research Centre, University of New South Wales Sydney, Sydney, Australia
| | - C M Moore
- Department of Biology, Colby College, Waterville, ME, USA
| | - X Moreira
- Misión Biológica de Galicia, Consejo Superior de Investigaciones Científicas, Pontevedra, Galicia, Spain
| | - C R Morrison
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX, USA
| | - M C Moshobane
- South African National Biodiversity Institute, Pretoria National Botanical Garden, Brummeria, Silverton, South Africa
- Centre for Functional Biodiversity, University of KwaZulu-Natal, Scottsville, Pietermaritzburg, South Africa
| | - A Muola
- Division of Biotechnology and Plant Health, Norwegian Institute of Bioeconomy Research, Tromsø, Norway
| | - R Nakadai
- Faculty of Environment and Information Sciences, Yokohama National University, Yokohama, Kanagawa, Japan
| | - K Nakajima
- Insitute of Science and Engineering, Chuo University, Tokyo, Japan
- Institute of Cave Research, Shimohei-guun, Iwate Prefecture, Japan
| | - S Novais
- Red de Interacciones Multitróficas, Instituto de Ecología A.C., Xalapa, Veracruz, Mexico
| | - C O Ogbebor
- Nigerian Institute for Oil Palm Research, Benin City, Edo State, Nigeria
| | - H Ohsaki
- Department of Biological Sciences, Hirosaki University, Hirosaki, Aomori, Japan
| | - V S Pan
- Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, MI, USA
- Department of Integrative Biology, Michigan State University, East Lansing, MI, USA
| | - N A Pardikes
- Department of Biology, Utah State University, Logan, UT, USA
| | - M Pareja
- Departamento de Biologia Animal, Universidade Estadual de Campinas, Campinas, Brazil
| | - N Parthasarathy
- Department of Ecology and Evironmental Sciences, Pondicherry University, Puducherry, India
| | | | - Q Paynter
- Manaaki Whenua - Landcare Research, Auckland, New Zealand
| | - I S Pearse
- U.S. Geological Survey, Fort Collins Science Center, Fort Collins, CO, USA
| | - R M Penczykowski
- Department of Biology, Washington University in St. Louis, St. Louis, MO, USA
| | - A A Pepi
- Department of Biology, Tufts University, Medford, MA, USA
| | - C C Pereira
- Department of Genetics, Ecology and Evolution, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - S S Phartyal
- School of Ecology & Environment Studies, Nalanda University, Rajgir, India
| | - F I Piper
- Millennium Nucleus of Patagonian Limit of Life and Instituto de Ciencias Biológicas, Universidad de Talca, Talca, Chile
- Institute of Ecology and Biodiversity, Ñuñoa, Santiago
| | - K Poveda
- Department of Entomology, Cornell University, Ithaca, NY, USA
| | - E G Pringle
- Biology Department, University of Nevada, Reno, Reno, NV, USA
| | - J Puy
- School of Natural Sciences, Zoology, Trinity College Dublin, Dublin, Ireland
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas, Sevilla, Spain
| | - T Quijano
- Departamento de Ecología Tropical, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - C Quintero
- INIBIOMA, CONICET - Universidad Nacional del Comahue, San Carlos de Bariloche, Río Negro, Argentina
| | - S Rasmann
- Institute of Biology, University of Neuchatel, Neuchatel, Switzerland
| | - C Rosche
- German Centre for Integrative Biodiversity Research (iDiv), Leipzig, Germany
- Institute of Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - L Y Rosenheim
- Department of Entomology and Nematology, University of California Davis, Davis, CA, USA
| | - J A Rosenheim
- Department of Entomology and Nematology, University of California Davis, Davis, CA, USA
| | - J B Runyon
- Rocky Mountain Research Station, USDA Forest Service, Bozeman, MT, USA
| | - A Sadeh
- Department of Natural Resources, Newe Ya'ar Research Center, Volcani Institute, Ramat Yishay, Israel
| | - Y Sakata
- Department of Biological Environment, Akita Prefectural University, Shimoshinjyo-Nakano, Akita, Japan
| | - D M Salcido
- Biology Department, University of Nevada, Reno, Reno, NV, USA
| | - C Salgado-Luarte
- Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, Universidad de La Serena, La Serena, Chile
| | - B A Santos
- Departamento de Sistemática e Ecologia Universidade Federal da Paraíba, João Pessoa, Brazil
| | - Y Sapir
- The Botanic Garden, School of Plant Sciences and Food Security, Faculty of Life Science, Tel Aviv University, Tel Aviv, Israel
| | - Y Sasal
- INIBIOMA, CONICET - Universidad Nacional del Comahue, San Carlos de Bariloche, Río Negro, Argentina
| | - Y Sato
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland
| | - M Sawant
- Department of Ecology, University of Pune, Maharashtra, India
| | - H Schroeder
- Department of Entomology, Cornell University, Ithaca, NY, USA
| | - I Schumann
- Department of Human Genetics, University of Leipzig, Leipzig, Germany
| | - M Segoli
- Mitrani Department of Desert Ecology, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion, Israel
| | - H Segre
- Department of Natural Resources, Institute of Plant Sciences, Agricultural Research Organization - Volcani Institute, Rishon Le Tzion, Israel
- Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
- Department of Natural Resources, Newe Ya'ar Research Center, Volcani Institute, Ramat Yishay, Israel
| | - O Shelef
- Department of Natural Resources, Institute of Plant Sciences, Agricultural Research Organization - Volcani Institute, Rishon Le Tzion, Israel
| | - N Shinohara
- Graduate School of Life Sciences, Tohoku University, Sendai, Japan
| | - R P Singh
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - D S Smith
- Department of Biology, California State University San Bernardino, San Bernardino, CA, USA
| | - M Sobral
- Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain
| | - G C Stotz
- Department of Plant and Environmental Sciences, Clemson University, Clemson, SC, USA
| | - A J M Tack
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - M Tayal
- Department of Plant and Environmental Sciences, Clemson University, Clemson, SC, USA
| | - J F Tooker
- Department of Entomology, The Pennsylvania State University, University Park, PA, USA
| | - D Torrico-Bazoberry
- Laboratorio de Comportamiento Animal y Humano, Centro de Investigación en Complejidad Social, Universidad del Desarrollo, Las Condes, Chile
| | - K Tougeron
- Écologie et Dynamique des Systèmes Anthropisés, Université de Picardie Jules Verne, UMR 7058 CNRS, Amiens, France
- Ecology of Interactions and Global Change, Institut de Recherche en Biosciences, Université de Mons, Mons, Belgium
| | - A M Trowbridge
- Department of Forest and Wildlife Ecology, University of Wisconsin, Madison, WI, USA
| | - S Utsumi
- Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, Hokkaido, Japan
| | - O Uyi
- Department of Animal and Environmental Biology, University of Benin, Benin City, Nigeria
- Department of Entomology, University of Georgia, Tifton, GA, USA
| | - J L Vaca-Uribe
- Programa de ingeniría agroecológica, Corporación Universitaria Minuto de Dios, Bogotá, Colombia
| | - A Valtonen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
| | - L J A van Dijk
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
- Department of Bioinformatics and Genetics, Swedish Museum of Natural History, Stockholm, Sweden
| | - V Vandvik
- Department of Biological Sciences, University of Bergen, Bergen, Norway
| | - J Villellas
- Department of Life Sciences, University of Alcalá, Madrid, Spain
| | - L P Waller
- Bioprotection Aotearoa, Lincoln University, Lincoln, New Zealand
| | - M G Weber
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA
| | - A Yamawo
- Department of Biological Sciences, Hirosaki University, Hirosaki, Aomori, Japan
- Center for Ecological Research, Kyoto University, Otsu, Japan
| | - S Yim
- Biology Department, University of Nevada, Reno, Reno, NV, USA
| | - P L Zarnetske
- Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, MI, USA
- Department of Integrative Biology, Michigan State University, East Lansing, MI, USA
| | - L N Zehr
- Department of Entomology, Michigan State University, East Lansing, MI, USA
| | - Z Zhong
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education/Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, Jilin Province, China
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing, China
| | - W C Wetzel
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Plant Resilience Institute, Michigan State University, East Lansing, MI, USA
- Ecology, Evolution, and Behavior Program, Michigan State University, East Lansing, MI, USA
- Department of Integrative Biology, Michigan State University, East Lansing, MI, USA
- W.K. Kellogg Biological Station, Michigan State University, Hickory Corners, MI, USA
- Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, USA
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Jones PL, Martin KR, Prachand SV, Hastings AP, Duplais C, Agrawal AA. Compound-Specific Behavioral and Enzymatic Resistance to Toxic Milkweed Cardenolides in a Generalist Bumblebee Pollinator. J Chem Ecol 2023; 49:418-427. [PMID: 36745328 DOI: 10.1007/s10886-023-01408-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 01/26/2023] [Accepted: 01/27/2023] [Indexed: 02/07/2023]
Abstract
Plant secondary metabolites that defend leaves from herbivores also occur in floral nectar. While specialist herbivores often have adaptations providing resistance to these compounds in leaves, many social insect pollinators are generalists, and therefore are not expected to be as resistant to such compounds. The milkweeds, Asclepias spp., contain toxic cardenolides in all tissues including floral nectar. We compared the concentrations and identities of cardenolides between tissues of the North American common milkweed Asclepias syriaca, and then studied the effect of the predominant cardenolide in nectar, glycosylated aspecioside, on an abundant pollinator. We show that a generalist bumblebee, Bombus impatiens, a common pollinator in eastern North America, consumes less nectar with experimental addition of ouabain (a standard cardenolide derived from Apocynacid plants native to east Africa) but not with addition of glycosylated aspecioside from milkweeds. At a concentration matching that of the maximum in the natural range, both cardenolides reduced activity levels of bees after four days of consumption, demonstrating toxicity despite variation in behavioral deterrence (i.e., consumption). In vitro enzymatic assays of Na+/K+-ATPase, the target site of cardenolides, showed lower toxicity of the milkweed cardenolide than ouabain for B. impatiens, indicating that the lower deterrence may be due to greater tolerance to glycosylated aspecioside. In contrast, there was no difference between the two cardenolides in toxicity to the Na+/K+-ATPase from a control insect, the fruit fly Drosophila melanogaster. Accordingly, this work reveals that even generalist pollinators such as B. impatiens may have adaptations to reduce the toxicity of specific plant secondary metabolites that occur in nectar, despite visiting flowers from a wide variety of plants over the colony's lifespan.
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Affiliation(s)
| | - Kyle R Martin
- Department of Biology, Bowdoin College, Brunswick, ME, USA
| | | | - Amy P Hastings
- Department of Ecology & Evolutionary Biology, Cornell University, Ithaca, NY, USA
| | - Christophe Duplais
- Department of Entomology, Cornell AgriTech, Cornell University, Geneva, NY, USA
| | - Anurag A Agrawal
- Department of Ecology & Evolutionary Biology, Cornell University, Ithaca, NY, USA
- Department of Entomology, Cornell AgriTech, Cornell University, Geneva, NY, USA
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Agrawal AA, Hastings AP. Tissue-specific plant toxins and adaptation in a specialist root herbivore. Proc Natl Acad Sci U S A 2023; 120:e2302251120. [PMID: 37216531 PMCID: PMC10235950 DOI: 10.1073/pnas.2302251120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 04/17/2023] [Indexed: 05/24/2023] Open
Abstract
In coevolution between plants and insects, reciprocal selection often leads to phenotype matching between chemical defense and herbivore offense. Nonetheless, it is not well understood whether distinct plant parts are differentially defended and how herbivores adapted to those parts cope with tissue-specific defense. Milkweed plants produce a diversity of cardenolide toxins and specialist herbivores have substitutions in their target enzyme (Na+/K+-ATPase), each playing a central role in milkweed-insect coevolution. The four-eyed milkweed beetle (Tetraopes tetrophthalmus) is an abundant toxin-sequestering herbivore that feeds exclusively on milkweed roots as larvae and less so on milkweed leaves as adults. Accordingly, we tested the tolerance of this beetle's Na+/K+-ATPase to cardenolide extracts from roots versus leaves of its main host (Asclepias syriaca), along with sequestered cardenolides from beetle tissues. We additionally purified and tested the inhibitory activity of dominant cardenolides from roots (syrioside) and leaves (glycosylated aspecioside). Tetraopes' enzyme was threefold more tolerant of root extracts and syrioside than leaf cardenolides. Nonetheless, beetle-sequestered cardenolides were more potent than those in roots, suggesting selective uptake or dependence on compartmentalization of toxins away from the beetle's enzymatic target. Because Tetraopes has two functionally validated amino acid substitutions in its Na+/K+-ATPase compared to the ancestral form in other insects, we compared its cardenolide tolerance to that of wild-type Drosophila and CRISPR-edited Drosophila with Tetraopes' Na+/K+-ATPase genotype. Those two amino acid substitutions accounted for >50% of Tetraopes' enhanced enzymatic tolerance of cardenolides. Thus, milkweed's tissue-specific expression of root toxins is matched by physiological adaptations in its specialist root herbivore.
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Affiliation(s)
- Anurag A. Agrawal
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY14853
- Department of Entomology, Cornell University, Ithaca, NY14853
| | - Amy P. Hastings
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY14853
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Formenti L, Iwanycki Ahlstrand N, Hassemer G, Glauser G, van den Hoogen J, Rønsted N, van der Heijden M, Crowther TW, Rasmann S. Macroevolutionary decline in mycorrhizal colonization and chemical defense responsiveness to mycorrhization. iScience 2023; 26:106632. [PMID: 37168575 PMCID: PMC10165190 DOI: 10.1016/j.isci.2023.106632] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/02/2023] [Accepted: 04/04/2023] [Indexed: 05/13/2023] Open
Abstract
Arbuscular mycorrhizal fungi (AMF) have evolved associations with roots of 60% plant species, but the net benefit for plants vary broadly from mutualism to parasitism. Yet, we lack a general understanding of the evolutionary and ecological forces driving such variation. To this end, we conducted a comparative phylogenetic experiment with 24 species of Plantago, encompassing worldwide distribution, to address the effect of evolutionary history and environment on plant growth and chemical defenses in response to AMF colonization. We demonstrate that different species within one plant genus vary greatly in their ability to associate with AMF, and that AMF arbuscule colonization intensity decreases monotonically with increasing phylogenetic branch length, but not with concomitant changes in pedological and climatic conditions across species. Moreover, we demonstrate that species with the highest colonization levels are also those that change their defensive chemistry the least. We propose that the costs imposed by high AMF colonization in terms of reduced changes in secondary chemistry might drive the observed macroevolutionary decline in mycorrhization.
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Affiliation(s)
- Ludovico Formenti
- Laboratory of Functional Ecology, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
- Institute of Ecology and Evolution, Terrestrial ecology, University of Bern, Bern, Switzerland
| | - Natalie Iwanycki Ahlstrand
- Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, 1350 Copenhagen, Denmark
| | - Gustavo Hassemer
- Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, 1350 Copenhagen, Denmark
| | - Gaëtan Glauser
- Neuchâtel Platform of Analytical Chemistry (NPAC), University of Neuchâtel, Neuchâtel, Switzerland
| | - Johan van den Hoogen
- Department of Environmental Systems Science, Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland
| | - Nina Rønsted
- Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, 1350 Copenhagen, Denmark
- National Tropical Botanical Garden, Kalaheo, HI 96741, USA
| | - Marcel van der Heijden
- Plant-Soil Interactions, Institute for Sustainability Sciences, Agroscope, 8046 Zürich, Switzerland
| | - Thomas W. Crowther
- Department of Environmental Systems Science, Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland
| | - Sergio Rasmann
- Laboratory of Functional Ecology, Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland
- Corresponding author
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Petrén H, Köllner TG, Junker RR. Quantifying chemodiversity considering biochemical and structural properties of compounds with the R package chemodiv. THE NEW PHYTOLOGIST 2023; 237:2478-2492. [PMID: 36527232 DOI: 10.1111/nph.18685] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 12/11/2022] [Indexed: 06/17/2023]
Abstract
Plants produce large numbers of phytochemical compounds affecting plant physiology and interactions with their biotic and abiotic environment. Recently, chemodiversity has attracted considerable attention as an ecologically and evolutionary meaningful way to characterize the phenotype of a mixture of phytochemical compounds. Currently used measures of phytochemical diversity, and related measures of phytochemical dissimilarity, generally do not take structural or biosynthetic properties of compounds into account. Such properties can be indicative of the compounds' function and inform about their biosynthetic (in)dependence, and should therefore be included in calculations of these measures. We introduce the R package chemodiv, which retrieves biochemical and structural properties of compounds from databases and provides functions for calculating and visualizing chemical diversity and dissimilarity for phytochemicals and other types of compounds. Our package enables calculations of diversity that takes the richness, relative abundance and - most importantly - structural and/or biosynthetic dissimilarity of compounds into account. We illustrate the use of the package with examples on simulated and real datasets. By providing the R package chemodiv for quantifying multiple aspects of chemodiversity, we hope to facilitate investigations of how chemodiversity varies across levels of biological organization, and its importance for the ecology and evolution of plants and other organisms.
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Affiliation(s)
- Hampus Petrén
- Evolutionary Ecology of Plants, Department of Biology, Philipps-University Marburg, 35043, Marburg, Germany
| | - Tobias G Köllner
- Department of Natural Product Biosynthesis, Max Planck Institute for Chemical Ecology, 07745, Jena, Germany
| | - Robert R Junker
- Evolutionary Ecology of Plants, Department of Biology, Philipps-University Marburg, 35043, Marburg, Germany
- Department of Environment and Biodiversity, University of Salzburg, 5020, Salzburg, Austria
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12
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Zhao L, Gao R, Liu J, Liu L, Li R, Men L, Zhang Z. Effects of Environmental Factors on the Spatial Distribution Pattern and Diversity of Insect Communities along Altitude Gradients in Guandi Mountain, China. INSECTS 2023; 14:224. [PMID: 36975909 PMCID: PMC10058187 DOI: 10.3390/insects14030224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 02/16/2023] [Accepted: 02/22/2023] [Indexed: 06/18/2023]
Abstract
Understanding the distribution patterns and underlying maintenance mechanisms of insect species is a core issue in the field of insect ecology. However, research gaps remain regarding the environmental factors that determine the distribution of insect species along altitudinal gradients in Guandi Mountain, China. Here, we explored these determinants based on the distribution pattern and diversity of insect species from 1600 m to 2800 m in the Guandi Mountain, which covers all typical vegetation ecosystems in this area. Our results showed that the insect community showed certain differentiation characteristics with the altitude gradient. The results of RDA and correlation analysis also support the above speculation and indicate that soil physicochemical properties are closely related to the distribution and diversity of insect taxa orders along the altitude gradient. In addition, the soil temperature showed an obvious decreasing trend with increasing altitude, and temperature was also the most significant environmental factor affecting the insect community structure and diversity on the altitude gradient. These findings provide a reference for exploring the maintenance mechanisms affecting the structure, distribution pattern, and diversity of insect communities in mountain ecosystems, and the effects of global warming on insect communities.
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Affiliation(s)
- Lijuan Zhao
- Department of Forest Conservation, College of Forestry, Shanxi Agricultural University, Jinzhong 030801, China
- Shanxi Dangerous Forest Pest Inspection and Identification Center, Jinzhong 030801, China
| | - Ruihe Gao
- Department of Forest Conservation, College of Forestry, Shanxi Agricultural University, Jinzhong 030801, China
- Shanxi Dangerous Forest Pest Inspection and Identification Center, Jinzhong 030801, China
| | - Jiaqi Liu
- Department of Forest Conservation, College of Forestry, Shanxi Agricultural University, Jinzhong 030801, China
- Shanxi Dangerous Forest Pest Inspection and Identification Center, Jinzhong 030801, China
| | - Lei Liu
- Department of Forest Conservation, College of Forestry, Shanxi Agricultural University, Jinzhong 030801, China
- Shanxi Dangerous Forest Pest Inspection and Identification Center, Jinzhong 030801, China
| | - Rongjiao Li
- Department of Forest Conservation, College of Forestry, Shanxi Agricultural University, Jinzhong 030801, China
- Shanxi Dangerous Forest Pest Inspection and Identification Center, Jinzhong 030801, China
| | - Lina Men
- Department of Forest Conservation, College of Forestry, Shanxi Agricultural University, Jinzhong 030801, China
- Shanxi Dangerous Forest Pest Inspection and Identification Center, Jinzhong 030801, China
| | - Zhiwei Zhang
- Department of Forest Conservation, College of Forestry, Shanxi Agricultural University, Jinzhong 030801, China
- Shanxi Dangerous Forest Pest Inspection and Identification Center, Jinzhong 030801, China
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13
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Wenda C, Nakamura A, Ashton LA. Season and herbivore defence trait mediate tri-trophic interactions in tropical rainforest. J Anim Ecol 2023; 92:466-476. [PMID: 36479696 DOI: 10.1111/1365-2656.13865] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 11/17/2022] [Indexed: 12/13/2022]
Abstract
Bottom-up effects from host plants and top-down effects from predators on herbivore abundance and distribution vary with physical environment, plant chemistry, predator and herbivore trait and diversity. Tri-trophic interactions in tropical ecosystems may follow different patterns from temperate ecosystems due to differences in above abiotic and biotic conditions. We sampled leaf-chewing larvae of Lepidoptera (caterpillars) from a dominant host tree species in a seasonal rainforest in Southwest China. We reared out parasitoids and grouped herbivores based on their diet preferences, feeding habits and defence mechanisms. We compared caterpillar abundance with leaf numbers ('bottom-up' effects) and parasitoid abundance ('top-down' effects) between different seasons and herbivore traits. We found bottom-up effects were stronger than top-down effects. Both bottom-up and top-down effects were stronger in the dry season than in the wet season, which were driven by polyphagous rare species and host plant phenology. Contrary to our predictions, herbivore traits did not influence differences in the bottom-up or top-down effects except for stronger top-down effects for shelter-builders. Our study shows season is the main predictor of the bottom-up and top-down effects in the tropics and highlights the complexity of these interactions.
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Affiliation(s)
- Cheng Wenda
- School of Ecology, Sun Yat-Sen University, Shenzhen, China.,State Key Laboratory of Biological Control, Sun Yat-sen University, Guangzhou, China
| | - Akihiro Nakamura
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China
| | - Louise A Ashton
- Ecology and Biodiversity Area, School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, China
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14
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Rubiano-Buitrago P, Pradhan S, Paetz C, Rowland HM. New Structures, Spectrometric Quantification, and Inhibitory Properties of Cardenolides from Asclepias curassavica Seeds. Molecules 2022; 28:molecules28010105. [PMID: 36615300 PMCID: PMC9822358 DOI: 10.3390/molecules28010105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/14/2022] [Accepted: 12/20/2022] [Indexed: 12/25/2022] Open
Abstract
Cardiac glycosides are a large class of secondary metabolites found in plants. In the genus Asclepias, cardenolides in milkweed plants have an established role in plant-herbivore and predator-prey interactions, based on their ability to inhibit the membrane-bound Na+/K+-ATPase enzyme. Milkweed seeds are eaten by specialist lygaeid bugs, which are the most cardenolide-tolerant insects known. These insects likely impose natural selection for the repeated derivatisation of cardenolides. A first step in investigating this hypothesis is to conduct a phytochemical profiling of the cardenolides in the seeds. Here, we report the concentrations of 10 purified cardenolides from the seeds of Asclepias curassavica. We report the structures of new compounds: 3-O-β-allopyranosyl coroglaucigenin (1), 3-[4'-O-β-glucopyranosyl-β-allopyranosyl] coroglaucigenin (2), 3'-O-β-glucopyranosyl-15-β-hydroxycalotropin (3), and 3-O-β-glucopyranosyl-12-β-hydroxyl coroglaucigenin (4), as well as six previously reported cardenolides (5-10). We test the in vitro inhibition of these compounds on the sensitive porcine Na+/K+-ATPase. The least inhibitory compound was also the most abundant in the seeds-4'-O-β-glucopyranosyl frugoside (5). Gofruside (9) was the most inhibitory. We found no direct correlation between the number of glycosides/sugar moieties in a cardenolide and its inhibitory effect. Our results enhance the literature on cardenolide diversity and concentration among tissues eaten by insects and provide an opportunity to uncover potential evolutionary relationships between tissue-specific defense expression and insect adaptations in plant-herbivore interactions.
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Affiliation(s)
- Paola Rubiano-Buitrago
- Research Group Predators and Toxic Prey, Max Planck Institute for Chemical Ecology, Hans Knöll Straße 8, 07745 Jena, Germany
- Research Group Biosynthesis/NMR, Max Planck Institute for Chemical Ecology, Hans Knöll Straße 8, 07745 Jena, Germany
- Correspondence: (P.R.-B.); (H.M.R.)
| | - Shrikant Pradhan
- Research Group Predators and Toxic Prey, Max Planck Institute for Chemical Ecology, Hans Knöll Straße 8, 07745 Jena, Germany
| | - Christian Paetz
- Research Group Biosynthesis/NMR, Max Planck Institute for Chemical Ecology, Hans Knöll Straße 8, 07745 Jena, Germany
| | - Hannah M. Rowland
- Research Group Predators and Toxic Prey, Max Planck Institute for Chemical Ecology, Hans Knöll Straße 8, 07745 Jena, Germany
- Correspondence: (P.R.-B.); (H.M.R.)
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15
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Rotter MC, Christie K, Holeski LM. Climate and the biotic community structure plant resistance across biogeographic groups of yellow monkeyflower. Ecol Evol 2022; 12:e9520. [PMID: 36440318 PMCID: PMC9682197 DOI: 10.1002/ece3.9520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 10/25/2022] [Accepted: 10/28/2022] [Indexed: 11/24/2022] Open
Abstract
Characterizing correlates of phytochemical resistance trait variation across a landscape can provide insight into the ecological factors that have shaped the evolution of resistance arsenals. Using field-collected data and a greenhouse common garden experiment, we assessed the relative influences of abiotic and biotic drivers of genetic-based defense trait variation across 41 yellow monkeyflower populations from western and eastern North America and the United Kingdom. Populations experience different climates, herbivore communities, and neighboring vegetative communities, and have distinct phytochemical resistance arsenals. Similarities in climate as well as herbivore and vegetative communities decline with increasing physical distance separating populations, and phytochemical resistance arsenal composition shows a similarly decreasing trend. Of the abiotic and biotic factors examined, temperature and the neighboring vegetation community had the strongest relative effects on resistance arsenal differentiation, whereas herbivore community composition and precipitation have relatively small effects. Rather than simply controlling for geographic proximity, we jointly assessed the relative strengths of both geographic and ecological variables on phytochemical arsenal compositional dissimilarity. Overall, our results illustrate how abiotic conditions and biotic interactions shape plant defense traits in natural populations.
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Affiliation(s)
- Michael C. Rotter
- Department of Biological SciencesNorthern Arizona UniversityFlagstaffArizonaUSA
- Department of BiologyUtah Valley UniversityOremUtahUSA
| | - Kyle Christie
- Department of Biological SciencesNorthern Arizona UniversityFlagstaffArizonaUSA
- Department of Plant BiologyMichigan State UniversityEast LansingMichiganUSA
| | - Liza M. Holeski
- Department of Biological SciencesNorthern Arizona UniversityFlagstaffArizonaUSA
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16
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Krueger AJ, Rault LC, Robinson EA, Weissling TJ, Vélez AM, Anderson TD. Pyrethroid insecticide and milkweed cardenolide interactions on detoxification enzyme activity and expression in monarch caterpillars. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2022; 187:105173. [PMID: 36127039 DOI: 10.1016/j.pestbp.2022.105173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
Declines of the monarch butterfly population have prompted large-scale plantings of milkweed to restore the population. In North America, there are >73 species of milkweed to choose from for these nationwide plantings. However, it is unclear how different milkweed species affect monarch caterpillar physiology, particularly detoxification enzyme activity and gene expression, given the highly variable cardenolide composition across milkweed species. Here, we investigate the effects of a high cardenolide, tropical milkweed species and a low cardenolide, swamp milkweed species on pyrethroid sensitivity as well as detoxification enzyme activity and expression in monarch caterpillars. Caterpillars fed on each species through the fifth-instar stage and were topically treated with bifenthrin after reaching this final-instar stage. Esterase, glutathione S-transferase, and cytochrome P450 monooxygenase activities were quantified as well as the expression of selected esterase, glutathione S-transferase, ABC transporter, and cytochrome P450 monooxygenase transcripts. There were no significant differences in survival 24 h after treatment with bifenthrin. However, bifenthrin significantly increased glutathione S-transferase activity in caterpillars feeding on tropical milkweed and significantly decreased esterase activity in caterpillars feeding on tropical and swamp milkweed. Significant differential expression of ABC transporter, glutathione S-transferase, and esterase genes was observed for caterpillars feeding on tropical and swamp milkweed and not receiving bifenthrin treatment. Furthermore, significant differential expression of glutathione S-transferase and esterase genes was observed for bifenthrin-treated and -untreated caterpillars feeding on tropical milkweed relative to swamp milkweed. These results suggest that feeding on different milkweed species can affect detoxification and development mechanisms with which monarch caterpillars rely on to cope with their environment.
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Affiliation(s)
- Annie J Krueger
- Department of Entomology, University of Nebraska, Lincoln, NE 68583, USA
| | - Leslie C Rault
- Department of Entomology, University of Nebraska, Lincoln, NE 68583, USA
| | - Emily A Robinson
- Department of Statistics, University of Nebraska, Lincoln, NE 68583, USA
| | - Thomas J Weissling
- Department of Entomology, University of Nebraska, Lincoln, NE 68583, USA
| | - Ana M Vélez
- Department of Entomology, University of Nebraska, Lincoln, NE 68583, USA
| | - Troy D Anderson
- Department of Entomology, University of Nebraska, Lincoln, NE 68583, USA.
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17
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Constitutive and Induced Defenses in Long-lived Pines Do Not Trade Off but Are Influenced by Climate. J Chem Ecol 2022; 48:746-760. [PMID: 35982356 DOI: 10.1007/s10886-022-01377-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/18/2022] [Accepted: 07/19/2022] [Indexed: 10/15/2022]
Abstract
Plants resist herbivores and pathogens by using constitutive (baseline) and inducible (change in defense after an attack) defenses. Inducibility has long been predicted to trade off with constitutive defense, reflecting the economic use of resources. However, empirical evidence for such tradeoffs is variable, and we still lack understanding about when and where defense trade-offs occur. We tested for tradeoffs between constitutive and induced defenses in natural populations of three species of long-lived pines (Pinus balfouriana, P. flexilis, P. longaeva) that differ greatly in constitutive defense and resistance to mountain pine beetle (MPB, Dendroctonus ponderosae). We also assessed how climate influenced constitutive and inducible defenses. At seven high-elevation sites in the western U.S., we simulated MPB attack to induce defenses and measured concentrations of terpene-based phloem defenses on days 0, 15, and 30. Constitutive and induced defenses did not trade off among or within species. Simulated MPB attack induced large increases in defense concentrations in all species independent of constitutive levels. MPB and its symbiotic fungi typically kill trees and thus could be selective forces maintaining strong inducibility within and among species. The contrasting constitutive concentrations in these species could be driven by the adaptation for specializing in harsh, high-elevation environments (e.g., P. balfouriana and P. longaeva) or by competition (e.g., P. flexilis), though these hypotheses have not been empirically examined. Climate influenced defenses, with the greatest concentrations of constitutive and induced defenses occurring at the coldest and driest sites. The interactions between climate and defenses have implications for these species under climate change.
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18
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Climatic history, constraints, and the plasticity of phytochemical traits under water stress. Ecosphere 2022. [DOI: 10.1002/ecs2.4167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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19
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Soderberg DN, Bentz BJ, Runyon JB, Hood SM, Mock KE. Chemical defense strategies, induction timing, growth, and trade‐offs in
Pinus aristata
and
Pinus flexilis. Ecosphere 2022. [DOI: 10.1002/ecs2.4183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- David N. Soderberg
- Wildland Resources Department Utah State University Logan Utah USA
- Ecology Center Utah State University Logan Utah USA
| | - Barbara J. Bentz
- USDA Forest Service, Rocky Mountain Research Station Logan Utah USA
| | - Justin B. Runyon
- USDA Forest Service, Rocky Mountain Research Station Bozeman Montana USA
| | - Sharon M. Hood
- USDA Forest Service, Rocky Mountain Research Station Missoula Montana USA
| | - Karen E. Mock
- Wildland Resources Department Utah State University Logan Utah USA
- Ecology Center Utah State University Logan Utah USA
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20
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Jacobsen DJ. Growth rate and life history shape plant resistance to herbivores. AMERICAN JOURNAL OF BOTANY 2022; 109:1074-1084. [PMID: 35686627 DOI: 10.1002/ajb2.16020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
PREMISE Plant defenses are shaped by many factors, including herbivory, lifespan, and mating system. Predictions about plant defense and resistance are often based on resource allocation trade-offs with plant growth and reproduction. Additionally, two types of plant resistance, constitutive and induced resistance, are predicted to be evolutionary alternatives or redundant strategies. Given the variety of plant trait combinations and non-mutually exclusive predictions, examining resistance strategies in related species with different combinations of growth and reproductive traits is important to tease apart roles of plant traits and evolutionary history on plant resistance. METHODS Phylogenetic comparative methods were used to examine the potentially interacting influences of life history (annual/perennial), mating system (self-compatible/self-incompatible), and species growth rates on constitutive resistance and inducibility (additional resistance following damage) across Physalis species (Solanaceae). RESULTS Resistance was evolutionarily labile, and there was no correlation between constitutive resistance and inducibility. Annual species with fast growth rates displayed higher constitutive resistance, but growth rate did not affect constitutive resistance in perennials. In contrast, inducibility was negatively associated with species growth rate regardless of life history or mating system. CONCLUSIONS The different effects of plant life history and growth rate on constitutive resistance and inducibility indicate that defensive evolution is unconstrained by a trade-off between resistance types. The interactions among plant life history, growth, and herbivore resistance show that plant defense is shaped not only by herbivore environment, but also by plant traits that reflect a plant's evolutionary history and local selective pressures.
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Affiliation(s)
- Deidra J Jacobsen
- Department of Biology, 1001 E. Third Street, Indiana University, Bloomington, IN, 47405, USA
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21
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Greenstein L, Steele C, Taylor CM. Host plant specificity of the monarch butterfly Danaus plexippus: A systematic review and meta-analysis. PLoS One 2022; 17:e0269701. [PMID: 35700160 PMCID: PMC9197062 DOI: 10.1371/journal.pone.0269701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 05/25/2022] [Indexed: 11/26/2022] Open
Abstract
The preference-performance hypothesis explains host specificity in phytophagous insects, positing that host plants chosen by adults confer the greatest larval fitness. However, adults sometimes oviposit on plants supporting low larval success because the components of host specificity (adult preference, plant palatability, and larval survival) are non-binary and not necessarily correlated. Palatability (willingness to eat) is governed by chemical cues and physical barriers such as trichomes, while survival (ability to complete development) depends upon nutrition and toxicity. Absence of a correlation between the components of host specificity results in low-performance hosts supporting limited larval development. Most studies of specificity focus on oviposition behavior leaving the importance and basis of palatability and survival under-explored. We conducted a comprehensive review of 127 plant species that have been claimed or tested to be hosts for the monarch butterfly Danaus plexippus to classify them as non-hosts, low performance, or high performance. We performed a meta-analysis to test if performance status could be explained by properties of neurotoxic cardenolides or trichome density. We also conducted a no-choice larval feeding experiment to identify causes of low performance. We identified 34 high performance, 42 low performance, 33 non-hosts, and 18 species with unsubstantiated claims. Mean cardenolide concentration was greater in high- than low-performance hosts and a significant predictor of host status, suggesting possible evolutionary trade-offs in monarch specialization. Other cardenolide properties and trichome density were not significant predictors of host status. In the experiment, we found, of the 62% of larvae that attempted to eat low-performance hosts, only 3.5% survived to adult compared to 85% of those on the high-performance host, demonstrating that multiple factors affect larval host plant specificity. Our study is the first to classify all known host plants for monarchs and has conservation implications for this threatened species.
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Affiliation(s)
- Lewis Greenstein
- Illinois Natural History Survey, University of Illinois at Urbana-Champaign, Champaign, Illinois, United States of America
- Ecology and Evolutionary Biology, Tulane University, New Orleans, Louisiana, United States of America
- * E-mail:
| | - Christen Steele
- Ecology and Evolutionary Biology, Tulane University, New Orleans, Louisiana, United States of America
| | - Caz M. Taylor
- Ecology and Evolutionary Biology, Tulane University, New Orleans, Louisiana, United States of America
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22
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Bischoff A, Pollier A, Tricault Y, Plantegenest M, Chauvel B, Franck P, Gardarin A. A multi-site experiment to test biocontrol effects of wildflower strips in different French climate zones. Basic Appl Ecol 2022. [DOI: 10.1016/j.baae.2022.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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23
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Freeman BG, Weeks T, Schluter D, Tobias JA. The latitudinal gradient in rates of evolution for bird beaks, a species interaction trait. Ecol Lett 2022; 25:635-646. [PMID: 35199924 DOI: 10.1111/ele.13726] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/21/2020] [Accepted: 02/11/2021] [Indexed: 11/29/2022]
Abstract
Where is evolution fastest? The biotic interactions hypothesis proposes that greater species richness creates more ecological opportunity, driving faster evolution at low latitudes, whereas the 'empty niches' hypothesis proposes that ecological opportunity is greater where diversity is low, spurring faster evolution at high latitudes. We tested these contrasting predictions by analysing rates of beak evolution for a global dataset of 1141 avian sister species. Rates of beak size evolution are similar across latitudes, with some evidence that beak shape evolves faster in the temperate zone, consistent with the empty niches hypothesis. The empty niches hypothesis is further supported by a meta-analysis showing that rates of trait evolution and recent speciation are generally faster in the temperate zone, whereas rates of molecular evolution are slightly faster in the tropics. Our results suggest that drivers of evolutionary diversification are either similar across latitudes or more potent in the temperate zone, thus calling into question multiple hypotheses that invoke faster tropical evolution to explain the latitudinal diversity gradient.
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Affiliation(s)
- Benjamin G Freeman
- Biodiversity Research Centre, University of British Columbia, Vancouver, Canada.,Department of Zoology, University of British Columbia, Vancouver, Canada
| | - Thomas Weeks
- Department of Life Sciences, Imperial College London, London, UK.,Department of Life Sciences, Natural History Museum, London, UK
| | - Dolph Schluter
- Biodiversity Research Centre, University of British Columbia, Vancouver, Canada.,Department of Zoology, University of British Columbia, Vancouver, Canada
| | - Joseph A Tobias
- Department of Life Sciences, Imperial College London, London, UK
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24
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Hansen TE, Enders LS. Host Plant Species Influences the Composition of Milkweed and Monarch Microbiomes. Front Microbiol 2022; 13:840078. [PMID: 35283842 PMCID: PMC8908431 DOI: 10.3389/fmicb.2022.840078] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 01/18/2022] [Indexed: 12/11/2022] Open
Abstract
Plants produce defensive chemicals for protection against insect herbivores that may also alter plant and insect associated microbial communities. However, it is unclear how expression of plant defenses impacts the assembly of insect and plant microbiomes, for example by enhancing communities for microbes that can metabolize defensive chemicals. Monarch butterflies (Danaus plexippus) feed on milkweed species (Asclepias spp.) that vary in production of toxic cardiac glycosides, which could alter associated microbiomes. We therefore sought to understand how different milkweed species, with varying defensive chemical profiles, influence the diversity and composition of monarch and milkweed (root and leaf) bacterial communities. Using a metabarcoding approach, we compared rhizosphere, phyllosphere and monarch microbiomes across two milkweed species (Asclepias curassavica, Asclepias syriaca) and investigated top-down effects of monarch feeding on milkweed microbiomes. Overall, monarch feeding had little effect on host plant microbial communities, but each milkweed species harbored distinct rhizosphere and phyllosphere microbiomes, as did the monarchs feeding on them. There was no difference in diversity between plants species for any of the microbial communities. Taxonomic composition significantly varied between plant species for rhizospheres, phyllospheres, and monarch microbiomes and no dispersion were detected between samples. Interestingly, phyllosphere and monarch microbiomes shared a high proportion of bacterial taxa with the rhizosphere (88.78 and 95.63%, respectively), while phyllosphere and monarch microbiomes had fewer taxa in common. Overall, our results suggest milkweed species select for unique sets of microbial taxa, but to what extent differences in expression of defensive chemicals directly influences microbiome assembly remains to be tested. Host plant species also appears to drive differences in monarch caterpillar microbiomes. Further work is needed to understand how monarchs acquire microbes, for example through horizontal transfer during feeding on leaves or encountering soil when moving on or between host plants.
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Affiliation(s)
- Thorsten E. Hansen
- Entomology Department, Purdue University, West Lafayette, IN, United States
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25
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Pocius VM, Majewska AA, Freedman MG. The Role of Experiments in Monarch Butterfly Conservation: A Review of Recent Studies and Approaches. ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA 2022; 115:10-24. [PMID: 35069967 PMCID: PMC8764570 DOI: 10.1093/aesa/saab036] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Indexed: 06/14/2023]
Abstract
Monarch butterflies (Danaus plexippus) (Lepidoptera Danaidae Danaus plexippus (Linnaeus)) are an iconic species of conservation concern due to declines in the overwintering colonies over the past twenty years. Because of this downward trend in overwintering numbers in both California and Mexico, monarchs are currently considered 'warranted-but-precluded' for listing under the Endangered Species Act. Monarchs have a fascinating life history and have become a model system in chemical ecology, migration biology, and host-parasite interactions, but many aspects of monarch biology important for informing conservation practices remain unresolved. In this review, we focus on recent advances using experimental and genetic approaches that inform monarch conservation. In particular, we emphasize three areas of broad importance, which could have an immediate impact on monarch conservation efforts: 1) breeding habitat and host plant use, 2) natural enemies and exotic caterpillar food plants, and 3) the utility of genetic and genomic approaches for understanding monarch biology and informing ongoing conservation efforts. We also suggest future studies in these areas that could improve our understanding of monarch behavior and conservation.
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Affiliation(s)
- Victoria M Pocius
- Department of Biological Sciences, University of Alabama, Tuscaloosa, AL, USA
| | | | - Micah G Freedman
- Department of Ecology and Evolution, University of Chicago, Chicago, IL, USA
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26
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Krueger AJ, Robinson EA, Weissling TJ, Vélez AM, Anderson TD. Cardenolide, Potassium, and Pyrethroid Insecticide Combinations Reduce Growth and Survival of Monarch Butterfly Caterpillars (Lepidoptera: Nymphalidae). JOURNAL OF ECONOMIC ENTOMOLOGY 2021; 114:2370-2380. [PMID: 34532742 DOI: 10.1093/jee/toab169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Indexed: 06/13/2023]
Abstract
The monarch butterfly, Danaus plexippus L., has evolved to be insensitive to milkweed cardenolides via genetic modifications of Na+/K+-ATPase. There is concern for insecticide exposures near agriculture, with little information on monarch caterpillar toxicology. It is unclear how cardenolide insensitivity may affect the sensitivity of monarch caterpillars to pyrethroid insecticides. Additionally, potassium fertilizers may affect monarch caterpillar physiology and cardenolide sequestration. Here, we investigated the growth, survival, and development of caterpillars exposed to the cardenolide ouabain, bifenthrin, and potassium chloride (KCl) alone and in combination. Caterpillars were either exposed to 1) ouabain from third- to fifth-instar stage, 2) KCl at fifth-instar stage, 3) KCl and bifenthrin at fifth-instar stage, or 4) combinations of ouabain at third-instar stage + KCl + bifenthrin at fifth-instar stage. Caterpillar weight, diet consumption, frass, and survival were recorded for the duration of the experiments. It was observed that 1-3 mg ouabain/g diet increased body weight and diet consumption, whereas 50 mg KCl/g diet decreased body weight and diet consumption. Caterpillars feeding on KCl and treated with 0.2 µg/µl bifenthrin consumed significantly less diet compared to individuals provided untreated diet. However, there was no effect on survival or body weight. Combinations of KCl + ouabain did not significantly affect caterpillar survival or body weight following treatment with 0.1 µg/µl bifenthrin. At the concentrations tested, there were no effects observed for bifenthrin sensitivity with increasing cardenolide or KCl concentrations. Further studies are warranted to understand how milkweed-specific cardenolides, at increasing concentrations, and agrochemical inputs can affect monarch caterpillar physiology near agricultural landscapes.
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Affiliation(s)
- Annie J Krueger
- Department of Entomology, University of Nebraska, Lincoln, NE, USA
| | - Emily A Robinson
- Department of Statistics, University of Nebraska, Lincoln, NE, USA
| | | | - Ana M Vélez
- Department of Entomology, University of Nebraska, Lincoln, NE, USA
| | - Troy D Anderson
- Department of Entomology, University of Nebraska, Lincoln, NE, USA
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Prouty C, Barriga P, Davis AK, Krischik V, Altizer S. Host Plant Species Mediates Impact of Neonicotinoid Exposure to Monarch Butterflies. INSECTS 2021; 12:insects12110999. [PMID: 34821799 PMCID: PMC8623494 DOI: 10.3390/insects12110999] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 10/27/2021] [Accepted: 11/02/2021] [Indexed: 11/16/2022]
Abstract
Simple Summary Neonicotinoids are the most widely used insecticides in North America and many studies document the negative effects of neonicotinoids on bees. Monarch butterflies are famous for their long-distance migrations, and for their ability to sequester toxins from their milkweed host plants. The neonicotinoids imidacloprid and clothianidin were suggested to correlate with declines in North American monarchs. We examined how monarch development, survival, and flight were affected by exposure to neonicotinoids, and how these effects depend on milkweed host plant species that differ in their cardenolide toxins. Monarch survival and flight were unaffected by low and intermediate neonicotinoid doses. At the highest dose, neonicotinoids negatively affected monarch pupation and survival, for caterpillars that fed on the least toxic milkweed. Monarchs fed milkweed of intermediate toxicity experienced moderate negative effects of high insecticide doses. Monarchs fed the most toxic milkweed species had no negative consequences associated with neonicotinoid treatment. Our work shows that monarchs tolerate low neonicotinoid doses, but experience detrimental effects at higher doses, depending on milkweed species. To our knowledge, this is the first study to show that host plant species potentially reduce the residue of neonicotinoid insecticides on the leaf surface, and this phenomenon warrants further investigation. Abstract Neonicotinoids are the most widely used insecticides in North America. Numerous studies document the negative effects of neonicotinoids on bees, and it remains crucial to demonstrate if neonicotinoids affect other non-target insects, such as butterflies. Here we examine how two neonicotinoids (imidacloprid and clothianidin) affect the development, survival, and flight of monarch butterflies, and how these chemicals interact with the monarch’s milkweed host plant. We first fed caterpillars field-relevant low doses (0.075 and 0.225 ng/g) of neonicotinoids applied to milkweed leaves (Asclepias incarnata), and found no significant reductions in larval development rate, pre-adult survival, or adult flight performance. We next fed larvae higher neonicotinoid doses (4–70 ng/g) and reared them on milkweed species known to produce low, moderate, or high levels of secondary toxins (cardenolides). Monarchs exposed to the highest dose of clothianidin (51–70 ng/g) experienced pupal deformity, low survival to eclosion, smaller body size, and weaker adult grip strength. This effect was most evident for monarchs reared on the lowest cardenolide milkweed (A. incarnata), whereas monarchs reared on the high-cardenolide A. curassavica showed no significant reductions in any variable measured. Our results indicate that monarchs are tolerant to low doses of neonicotinoid, and that negative impacts of neonicotinoids depend on host plant type. Plant toxins may confer protective effects or leaf physical properties may affect chemical retention. Although neonicotinoid residues are ubiquitous on milkweeds in agricultural and ornamental settings, commonly encountered doses below 50 ng/g are unlikely to cause substantial declines in monarch survival or migratory performance.
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Affiliation(s)
- Cody Prouty
- Odum School of Ecology, University of Georgia, Athens, GA 30602, USA; (P.B.); (A.K.D.); (S.A.)
- Correspondence:
| | - Paola Barriga
- Odum School of Ecology, University of Georgia, Athens, GA 30602, USA; (P.B.); (A.K.D.); (S.A.)
| | - Andrew K. Davis
- Odum School of Ecology, University of Georgia, Athens, GA 30602, USA; (P.B.); (A.K.D.); (S.A.)
| | - Vera Krischik
- Department of Entomology, University of Minnesota, St. Paul, MN 55108, USA;
| | - Sonia Altizer
- Odum School of Ecology, University of Georgia, Athens, GA 30602, USA; (P.B.); (A.K.D.); (S.A.)
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Liu M, Pan Y, Pan X, Sosa A, Blumenthal DM, Van Kleunen M, Li B. Plant invasion alters latitudinal pattern of plant-defense syndromes. Ecology 2021; 102:e03511. [PMID: 34355383 DOI: 10.1002/ecy.3511] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 04/08/2021] [Accepted: 05/17/2021] [Indexed: 11/07/2022]
Abstract
The relationship between herbivory and latitude may differ between native and introduced populations of invasive plants, which can generate latitudinal heterogeneity in the strength of enemy release. However, still little is known about how latitudinal heterogeneity in herbivore pressure influences latitudinal variation in defense phenotypes of invasive plants. We tested how latitudinal patterns in multi-variate defense syndromes differed between native (Argentinian) and introduced (Chinese) populations of the invasive herb Alternanthera philoxeroides. In addition, to better understand the drivers underlying latitudinal patterns, we also tested whether associations of defense syndromes with climate and herbivory differed between native and introduced ranges. We found that native plant populations clustered into three main defense syndromes associated with latitude. In contrast, we only found two defense syndromes in the introduced range. One matched the high-latitude syndrome from the native range, but was distributed at both the northern and southern range limits in the introduced range. The other was unique to the introduced range and occurred at mid-latitudes. Climatic conditions were associated with variation in syndromes in the native range, and climatic conditions and herbivory were associated with variation in syndromes in the introduced range. Together, our results demonstrate that plants may under the new environmental conditions in the introduced range show latitudinal patterns of defense syndromes that are different from those in their native range. This emphasizes that geographical dependence of population differentiation should be explicitly considered in studies on the evolution of defense in invasive plants.
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Affiliation(s)
- Mu Liu
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Yuanfei Pan
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, 200438, China.,School of Public Health, Fudan University, Shanghai, 200032, China
| | - Xiaoyun Pan
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, 200438, China.,Research Center for Ecology, College of Science, Tibet University, Lhasa, 850000, China.,Tibet University - Fudan University Joint Laboratory for Biodiversity and Global Change, Fudan University, Shanghai, 200438, China
| | - Alejandro Sosa
- Fundación para el Estudio de Especies Invasivas (FuEDEI), Hurlingham, Buenos Aires, 999071, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, 999071, Argentina
| | - Dana M Blumenthal
- Rangeland Resources & Systems Research Unit, USDA Agricultural Research Service, Fort Collins, Colorado, 80526, USA
| | - Mark Van Kleunen
- Ecology, Department of Biology, University of Konstanz, Konstanz, 78464, Germany.,Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, 318000, China
| | - Bo Li
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, 200438, China
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Potts AS, Hunter MD. Unraveling the roles of genotype and environment in the expression of plant defense phenotypes. Ecol Evol 2021; 11:8542-8561. [PMID: 34257915 PMCID: PMC8258211 DOI: 10.1002/ece3.7639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 04/06/2021] [Indexed: 11/09/2022] Open
Abstract
Phenotypic variability results from interactions between genotype and environment and is a major driver of ecological and evolutionary interactions. Measuring the relative contributions of genetic variation, the environment, and their interaction to phenotypic variation remains a fundamental goal of evolutionary ecology.In this study, we assess the question: How do genetic variation and local environmental conditions interact to influence phenotype within a single population? We explored this question using seed from a single population of common milkweed, Asclepias syriaca, in northern Michigan. We first measured resistance and resistance traits of 14 maternal lines in two common garden experiments (field and greenhouse) to detect genetic variation within the population. We carried out a reciprocal transplant experiment with three of these maternal lines to assess effects of local environment on phenotype. Finally, we compared the phenotypic traits measured in our experiments with the phenotypic traits of the naturally growing maternal genets to be able to compare relative effect of genetic and environmental variation on naturally occurring phenotypic variation. We measured defoliation levels, arthropod abundances, foliar cardenolide concentrations, foliar latex exudation, foliar carbon and nitrogen concentrations, and plant growth.We found a striking lack of correlation in trait expression of the maternal lines between the common gardens, or between the common gardens and the naturally growing maternal genets, suggesting that environment plays a larger role in phenotypic trait variation of this population. We found evidence of significant genotype-by-environment interactions for all traits except foliar concentrations of nitrogen and cardenolide. Milkweed resistance to chewing herbivores was associated more strongly with the growing environment. We observed no variation in foliar cardenolide concentrations among maternal lines but did observe variation among maternal lines in foliar latex exudation.Overall, our data reveal powerful genotype-by-environment interactions on the expression of most resistance traits in milkweed.
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Affiliation(s)
- Abigail S. Potts
- Department of Ecology & Evolutionary BiologyUniversity of MichiganAnn ArborMIUSA
| | - Mark D. Hunter
- Department of Ecology & Evolutionary BiologyUniversity of MichiganAnn ArborMIUSA
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30
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Perkovich C, Ward D. Herbivore-induced defenses are not under phylogenetic constraints in the genus Quercus (oak): Phylogenetic patterns of growth, defense, and storage. Ecol Evol 2021; 11:5187-5203. [PMID: 34026000 PMCID: PMC8131805 DOI: 10.1002/ece3.7409] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/05/2021] [Accepted: 02/12/2021] [Indexed: 11/30/2022] Open
Abstract
The evolution of plant defenses is often constrained by phylogeny. Many of the differences between competing plant defense theories hinge upon the differences in the location of meristem damage (apical versus auxiliary) and the amount of tissue removed. We analyzed the growth and defense responses of 12 Quercus (oak) species from a well-resolved molecular phylogeny using phylogenetically independent contrasts. Access to light is paramount for forest-dwelling tree species, such as many members of the genus Quercus. We therefore predicted a greater investment in defense when apical meristem tissue was removed. We also predicted a greater investment in defense when large amounts of tissue were removed and a greater investment in growth when less tissues were removed. We conducted five simulated herbivory treatments including a control with no damage and alterations of the location of meristem damage (apical versus auxiliary shoots) and intensity (25% versus 75% tissue removal). We measured growth, defense, and nutrient re-allocation traits in response to simulated herbivory. Phylomorphospace models were used to demonstrate the phylogenetic nature of trade-offs between characteristics of growth, chemical defenses, and nutrient re-allocation. We found that growth-defense trade-offs in control treatments were under phylogenetic constraints, but phylogenetic constraints and growth-defense trade-offs were not common in the simulated herbivory treatments. Growth-defense constraints exist within the Quercus genus, although there are adaptations to herbivory that vary among species.
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Affiliation(s)
| | - David Ward
- Department of Biological SciencesKent State UniversityKentOHUSA
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Cardenolides, toxicity, and the costs of sequestration in the coevolutionary interaction between monarchs and milkweeds. Proc Natl Acad Sci U S A 2021; 118:2024463118. [PMID: 33850021 DOI: 10.1073/pnas.2024463118] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
For highly specialized insect herbivores, plant chemical defenses are often co-opted as cues for oviposition and sequestration. In such interactions, can plants evolve novel defenses, pushing herbivores to trade off benefits of specialization with costs of coping with toxins? We tested how variation in milkweed toxins (cardenolides) impacted monarch butterfly (Danaus plexippus) growth, sequestration, and oviposition when consuming tropical milkweed (Asclepias curassavica), one of two critical host plants worldwide. The most abundant leaf toxin, highly apolar and thiazolidine ring-containing voruscharin, accounted for 40% of leaf cardenolides, negatively predicted caterpillar growth, and was not sequestered. Using whole plants and purified voruscharin, we show that monarch caterpillars convert voruscharin to calotropin and calactin in vivo, imposing a burden on growth. As shown by in vitro experiments, this conversion is facilitated by temperature and alkaline pH. We next employed toxin-target site experiments with isolated cardenolides and the monarch's neural Na+/K+-ATPase, revealing that voruscharin is highly inhibitory compared with several standards and sequestered cardenolides. The monarch's typical >50-fold enhanced resistance to cardenolides compared with sensitive animals was absent for voruscharin, suggesting highly specific plant defense. Finally, oviposition was greatest on intermediate cardenolide plants, supporting the notion of a trade-off between benefits and costs of sequestration for this highly specialized herbivore. There is apparently ample opportunity for continued coevolution between monarchs and milkweeds, although the diffuse nature of the interaction, due to migration and interaction with multiple milkweeds, may limit the ability of monarchs to counteradapt.
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32
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DeLaMater DS, Couture JJ, Puzey JR, Dalgleish HJ. Range-wide variations in common milkweed traits and their effect on monarch larvae. AMERICAN JOURNAL OF BOTANY 2021; 108:388-401. [PMID: 33792047 DOI: 10.1002/ajb2.1630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 10/08/2020] [Indexed: 06/12/2023]
Abstract
PREMISE Leaf economic spectrum (LES) theory has historically been employed to inform vegetation models of ecosystem processes, but largely neglects intraspecific variation and biotic interactions. We attempt to integrate across environment-plant trait-herbivore interactions within a species at a range-wide scale. METHODS We measured traits in 53 populations spanning the range of common milkweed (Asclepias syriaca) and used a common garden to determine the role of environment in driving patterns of intraspecific variation. We used a feeding trial to determine the role of plant traits in monarch (Danaus plexippus) larval development. RESULTS Trait-trait relationships largely followed interspecific patterns in LES theory and persisted in a common garden when individual traits change. Common milkweed showed intraspecific variation and biogeographic clines in traits. Clines did not persist in a common garden. Larvae ate more and grew larger when fed plants with more nitrogen. A longitudinal environmental gradient in precipitation corresponded to a resource gradient in plant nitrogen, which produces a gradient in larval performance. CONCLUSIONS Biogeographic patterns in common milkweed traits can sometimes be predicted from LES, are largely driven by environmental conditions, and have consequences for monarch larval performance. Changes to nutrient dynamics of landscapes with common milkweed could potentially influence monarch population dynamics. We show how biogeographic trends in intraspecific variation can influence key ecological interactions, especially in common species with large distributions.
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Affiliation(s)
- David S DeLaMater
- Department of Biology, William & Mary, 540 Landrum Drive, Williamsburg, VA, 23185, USA
| | - John J Couture
- Departments of Entomology and Forestry and Natural Resources, Purdue University, 170 S. University Street, West Lafayette, IN, 47907, USA
| | - Joshua R Puzey
- Department of Biology, William & Mary, 540 Landrum Drive, Williamsburg, VA, 23185, USA
| | - Harmony J Dalgleish
- Department of Biology, William & Mary, 540 Landrum Drive, Williamsburg, VA, 23185, USA
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Bakhtiari M, Glauser G, Defossez E, Rasmann S. Ecological convergence of secondary phytochemicals along elevational gradients. THE NEW PHYTOLOGIST 2021; 229:1755-1767. [PMID: 32981048 DOI: 10.1111/nph.16966] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 09/11/2020] [Indexed: 06/11/2023]
Abstract
Biologists still strive to identify the ecological and evolutionary drivers of phytochemical variation that mediate biotic interactions. We hypothesized that plant species growing at sites characterized by high herbivore pressure would converge to produce highly toxic blends of secondary metabolites, independent of phylogenetic constraints. To address the role of shared evolutionary history and ecological niches in driving variation in plant phytochemistry, we combined targeted metabolomics with insect herbivore bioassays and with a set of growth-related traits of several Cardamine species growing along the entire elevational gradient of the Alps. We observed that Cardamine phytochemical profiles grouped according to previously established growth form categorizations within specific abiotic conditions, independently of phylogenetic relationship. We also showed that novel indices summarizing functional phytochemical diversity better explain plant resistance against chewing and sap-feeding herbivores than classic diversity indices. We conclude that multiple functional axes of phytochemical diversity should be integrated with the functional axis of plant growth forms to study phenotypic convergence along large-scale ecological gradients.
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Affiliation(s)
- Moe Bakhtiari
- Institute of Biology, University of Neuchâtel, Rue-Emile Argand 11, Neuchâtel, 2000, Switzerland
- Department of Integrative Biology, University of California, Berkeley, CA, 94720, USA
| | - Gaétan Glauser
- Neuchâtel Platform of Analytical Chemistry (NPAC), Avenue de Bellevaux 51, Neuchâtel, 2000, Switzerland
| | - Emmanuel Defossez
- Institute of Biology, University of Neuchâtel, Rue-Emile Argand 11, Neuchâtel, 2000, Switzerland
| | - Sergio Rasmann
- Institute of Biology, University of Neuchâtel, Rue-Emile Argand 11, Neuchâtel, 2000, Switzerland
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Decker LE, Jeffrey CS, Ochsenrider KM, Potts AS, de Roode JC, Smilanich AM, Hunter MD. Elevated atmospheric concentrations of CO 2 increase endogenous immune function in a specialist herbivore. J Anim Ecol 2020; 90:628-640. [PMID: 33241571 DOI: 10.1111/1365-2656.13395] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 10/20/2020] [Indexed: 11/30/2022]
Abstract
Animals rely on a balance of endogenous and exogenous sources of immunity to mitigate parasite attack. Understanding how environmental context affects that balance is increasingly urgent under rapid environmental change. In herbivores, immunity is determined, in part, by phytochemistry which is plastic in response to environmental conditions. Monarch butterflies Danaus plexippus, consistently experience infection by a virulent parasite Ophryocystis elektroscirrha, and some medicinal milkweed (Asclepias) species, with high concentrations of toxic steroids (cardenolides), provide a potent source of exogenous immunity. We investigated plant-mediated influences of elevated CO2 (eCO2 ) on endogenous immune responses of monarch larvae to infection by O. elektroscirrha. Recently, transcriptomics have revealed that infection by O. elektroscirrha does not alter monarch immune gene regulation in larvae, corroborating that monarchs rely more on exogenous than endogenous immunity. However, monarchs feeding on medicinal milkweed grown under eCO2 lose tolerance to the parasite, associated with changes in phytochemistry. Whether changes in milkweed phytochemistry induced by eCO2 alter the balance between exogenous and endogenous sources of immunity remains unknown. We fed monarchs two species of milkweed; A. curassavica (medicinal) and A. incarnata (non-medicinal) grown under ambient CO2 (aCO2 ) or eCO2 . We then measured endogenous immune responses (phenoloxidase activity, haemocyte concentration and melanization strength), along with foliar chemistry, to assess mechanisms of monarch immunity under future atmospheric conditions. The melanization response of late-instar larvae was reduced on medicinal milkweed in comparison to non-medicinal milkweed. Moreover, the endogenous immune responses of early-instar larvae to infection by O. elektroscirrha were generally lower in larvae reared on foliage from aCO2 plants and higher in larvae reared on foliage from eCO2 plants. When grown under eCO2 , milkweed plants exhibited lower cardenolide concentrations, lower phytochemical diversity and lower nutritional quality (higher C:N ratios). Together, these results suggest that the loss of exogenous immunity from foliage under eCO2 results in increased endogenous immune function. Animal populations face multiple threats induced by anthropogenic environmental change. Our results suggest that shifts in the balance between exogenous and endogenous sources of immunity to parasite attack may represent an underappreciated consequence of environmental change.
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Affiliation(s)
- Leslie E Decker
- Department of Biology, Stanford University, Stanford, CA, USA.,Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA
| | | | | | - Abigail S Potts
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA
| | | | | | - Mark D Hunter
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA
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Singh SP, Kumar S, Mathan SV, Tomar MS, Singh RK, Verma PK, Kumar A, Kumar S, Singh RP, Acharya A. Therapeutic application of Carica papaya leaf extract in the management of human diseases. Daru 2020; 28:735-744. [PMID: 32367410 PMCID: PMC7704890 DOI: 10.1007/s40199-020-00348-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 04/14/2020] [Indexed: 02/06/2023] Open
Abstract
INTRODUCTION Papaya (Carica papaya Linn.) belongs to the family Caricaceae and is well known for its therapeutic and nutritional properties all over the world. The different parts of the papaya plant have been used since ancient times for its therapeutic applications. Herein, we aimed to review the anticancer, anti-inflammatory, antidiabetic and antiviral activities of papaya leaf. METHODS All information presented in this review article regarding the therapeutic application of Carica papaya leaf extract has been acquired by approaching various electronic databases, including Scopus, Google scholar, Web of science, and PubMed. The keywords Carica papaya, anticancer, anti-inflammatory, immunomodulatory, and phytochemicals were explored until December 2019. RESULTS The papaya plant, including fruit, leaf, seed, bark, latex, and their ingredients play a major role in the management of disease progression. Carica papaya leaf contains active components such as alkaloids, glycosides, tannins, saponins, and flavonoids, which are responsible for its medicinal activity. Additionally, the leaf juice of papaya increases the platelet counts in people suffering from dengue fever. CONCLUSION The major findings revealed that papaya leaf extract has strong medicinal properties such as antibacterial, antiviral, antitumor, hypoglycaemic and anti-inflammatory activity. Furthermore, clinical trials are needed to explore the medicative potential of papaya leaf. Graphical abstract Graphical abstract showing the medicinal properties of Carica papaya leaf.
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Affiliation(s)
- Surya P Singh
- Department of Zoology, Banaras Hindu University, Varanasi, UP, India
| | - Sanjay Kumar
- Cancer and Radiation Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Sivapar V Mathan
- Cancer and Radiation Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | | | - Rishi Kant Singh
- Department of Zoology, Banaras Hindu University, Varanasi, UP, India
| | | | - Amit Kumar
- Department of Zoology, Banaras Hindu University, Varanasi, UP, India
| | - Sandeep Kumar
- Department of Zoology, Banaras Hindu University, Varanasi, UP, India
| | - Rana P Singh
- Cancer and Radiation Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India.
| | - Arbind Acharya
- Department of Zoology, Banaras Hindu University, Varanasi, UP, India.
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Mirzaei M, Züst T, Younkin GC, Hastings AP, Alani ML, Agrawal AA, Jander G. Less Is More: a Mutation in the Chemical Defense Pathway of Erysimum cheiranthoides (Brassicaceae) Reduces Total Cardenolide Abundance but Increases Resistance to Insect Herbivores. J Chem Ecol 2020; 46:1131-1143. [PMID: 33180277 DOI: 10.1007/s10886-020-01225-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 10/06/2020] [Accepted: 10/09/2020] [Indexed: 11/29/2022]
Abstract
Erysimum cheiranthoides L (Brassicaceae; wormseed wallflower) accumulates not only glucosinolates, which are characteristic of the Brassicaceae, but also abundant and diverse cardenolides. These steroid toxins, primarily glycosylated forms of digitoxigenin, cannogenol, and strophanthidin, inhibit the function of essential Na+/K+-ATPases in animal cells. We screened a population of 659 ethylmethanesulfonate-mutagenized E. cheiranthoides plants to identify isolates with altered cardenolide profiles. One mutant line exhibited 66% lower cardenolide content, resulting from greatly decreased cannogenol and strophanthidin glycosides, partially compensated for by increases in digitoxigenin glycosides. This phenotype was likely caused by a single-locus recessive mutation, as evidenced by a wildtype phenotype of F1 plants from a backcross, a 3:1 wildtype:mutant segregation in the F2 generation, and genetic mapping of the altered cardenolide phenotype to one position in the genome. The mutation created a more even cardenolide distribution, decreased the average cardenolide polarity, but did not impact most glucosinolates. Growth of generalist herbivores from two feeding guilds, Myzus persicae Sulzer (Hemiptera: Aphididae; green peach aphid) and Trichoplusia ni Hübner (Lepidoptera: Noctuidae; cabbage looper), was decreased on the mutant line compared to wildtype. Both herbivores accumulated cardenolides in proportion to the plant content, with T. ni accumulating higher total concentrations than M. persicae. Helveticoside, a relatively abundant cardenolide in E. cheiranthoides, was not detected in M. persicae feeding on these plants. Our results support the hypothesis that increased digitoxigenin glycosides provide improved protection against M. persicae and T. ni, despite an overall decrease in cardenolide content of the mutant line.
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Affiliation(s)
- Mahdieh Mirzaei
- Boyce Thompson Institute, 533 Tower Rd, Ithaca, NY, 14853, USA
| | - Tobias Züst
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013, Bern, Switzerland
| | | | - Amy P Hastings
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA
| | - Martin L Alani
- Boyce Thompson Institute, 533 Tower Rd, Ithaca, NY, 14853, USA
| | - Anurag A Agrawal
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA
| | - Georg Jander
- Boyce Thompson Institute, 533 Tower Rd, Ithaca, NY, 14853, USA.
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37
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Freeman BG, Scholer MN, Boehm MMA, Heavyside J, Schluter D. Adaptation and Latitudinal Gradients in Species Interactions: Nest Predation in Birds. Am Nat 2020; 196:E160-E166. [PMID: 33211562 DOI: 10.1086/711415] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractAre biotic interactions stronger in the tropics? Here, we investigate nest predation in birds, a canonical example of a strong tropical biotic interaction. Counter to expectations, daily rates of nest predation vary minimally with latitude. However, life-history traits that influence nest predation have diverged between latitudes. For example, tropical species have evolved a longer average nesting period, which is associated with reduced rates of nest attendance by parents. Daily nest mortality declines with nesting period length within regions, but tropical species have a higher intercept. Consequently, for the same nesting period length, tropical species experience higher daily nest predation rates than temperate species. The implication of this analysis is that the evolved difference in nesting period length between latitudes produces a flatter latitudinal gradient in daily nest predation than would otherwise be predicted. We propose that adaptation may frequently dampen geographic patterns in interaction rates.
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38
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Applying a Chemogeographic Strategy for Natural Product Discovery from the Marine Cyanobacterium Moorena bouillonii. Mar Drugs 2020; 18:md18100515. [PMID: 33066480 PMCID: PMC7602127 DOI: 10.3390/md18100515] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 10/04/2020] [Accepted: 10/08/2020] [Indexed: 12/16/2022] Open
Abstract
The tropical marine cyanobacterium Moorena bouillonii occupies a large geographic range across the Indian and Western Tropical Pacific Oceans and is a prolific producer of structurally unique and biologically active natural products. An ensemble of computational approaches, including the creation of the ORCA (Objective Relational Comparative Analysis) pipeline for flexible MS1 feature detection and multivariate analyses, were used to analyze various M. bouillonii samples. The observed chemogeographic patterns suggested the production of regionally specific natural products by M. bouillonii. Analyzing the drivers of these chemogeographic patterns allowed for the identification, targeted isolation, and structure elucidation of a regionally specific natural product, doscadenamide A (1). Analyses of MS2 fragmentation patterns further revealed this natural product to be part of an extensive family of herein annotated, proposed natural structural analogs (doscadenamides B–J, 2–10); the ensemble of structures reflect a combinatorial biosynthesis using nonribosomal peptide synthetase (NRPS) and polyketide synthase (PKS) components. Compound 1 displayed synergistic in vitro cancer cell cytotoxicity when administered with lipopolysaccharide (LPS). These discoveries illustrate the utility in leveraging chemogeographic patterns for prioritizing natural product discovery efforts.
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39
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Mundim FM, Pringle EG. Phytochemistry-mediated disruption of ant-aphid interactions by root-feeding nematodes. Oecologia 2020; 194:441-454. [PMID: 33051776 DOI: 10.1007/s00442-020-04777-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 10/03/2020] [Indexed: 11/26/2022]
Abstract
Plants link interactions between aboveground and belowground organisms. Herbivore-induced changes in plant chemistry are hypothesized to impact entire food webs by changing the strength of trophic cascades. Yet, few studies have explored how belowground herbivores affect the behaviors of generalist predators, nor how such changes may act through diverse changes to the plant metabolome. Using a factorial experiment, we tested whether herbivory by root-knot nematodes (Meloidogyne incognita) affected the aboveground interaction among milkweed plants (Asclepias fascicularis or Asclepias speciosa), oleander aphids (Aphis nerii), and aphid-tending ants (Linepithema humile). We quantified the behaviors of aphid-tending ants, and we measured the effects of herbivore treatments on aphid densities and on phytochemistry. Unexpectedly, ants tended aphids primarily on the leaves of uninfected plants, whereas ants tended aphids primarily at the base of the stem of nematode-infected plants. In nematode-infected plants, aphids excreted more sugar per capita in their ant-attracting honeydew. Additionally, although plant chemistry was species-specific, nematode infection generally decreased the richness of plant secondary metabolites while acting as a protein sink in the roots. Path analysis indicated that the ants' behavioral change was driven in part by indirect effects of nematodes acting through changes in plant chemistry. We conclude that belowground herbivores can affect the behaviors of aboveground generalist ant predators by multiple paths, including changes in phytochemistry, which may affect the attractiveness of aphid honeydew rewards.
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Affiliation(s)
| | - Elizabeth G Pringle
- Department of Biology, University of Nevada, Reno, NV, USA.
- Program in Ecology, Evolution and Conservation Biology, University of Nevada, Reno, NV, USA.
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40
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Glassmire AE, Zehr LN, Wetzel WC. Disentangling dimensions of phytochemical diversity: alpha and beta have contrasting effects on an insect herbivore. Ecology 2020; 101:e03158. [PMID: 32745232 DOI: 10.1002/ecy.3158] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 04/23/2020] [Accepted: 06/18/2020] [Indexed: 11/10/2022]
Abstract
Phytochemical diversity is comprised of two main dimensions-the average (alpha) within-plant neighbors or the difference (beta) in the composition of chemicals between plant neighbors. Research, however, has primarily examined the consequences of phytochemical diversity on herbivore performance through a single dimension, even though diversity is multidimensional. Furthermore, the ecological role of phytochemical diversity is not well understood because each of these dimensions exhibits unique biological effects on herbivore performance. Therefore, it has been difficult to tease apart the relative importance of alpha and beta chemical diversities on plant-herbivore interactions. We experimentally manipulated alpha and beta diversities along a chemical gradient to disentangle the relative effects of these dimensions on the performance of a mobile generalist herbivore, Trichoplusia ni (Hübner), using 16 genotypes from the Solanum pennellii introgression lines. First, we found contrasting effects of alpha and beta diversities on herbivore performance. Second, when comparing diversity across and within chemical classes, herbivore performance was reduced when plant neighbors had greater diversity within chemical classes that are biologically inhibiting at higher quantities (i.e., quantitative defenses such as phenolics and acyl sugars). However, herbivore performance was enhanced when plant neighbors had higher levels of chemical classes that are biologically toxic (i.e., qualitative defenses such as alkaloids). Finally, herbivores performed better on plant dicultures compared to monocultures, and performance was positively associated with plant dicultures only when there were high levels of average alpha diversity within plant neighbors. Our results suggest T. ni generalist caterpillars do better when plant neighbors are chemically different because differences provide options for them to choose or to switch between plants to balance chemical uptake. Overall, herbivores interact with a large diversity of plant chemicals at multiple scales, and our results indicate that not all chemical diversity is equal: specific dimensions of phytochemical diversity have unique effects on the dynamics of herbivore performance.
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Affiliation(s)
- Andrea E Glassmire
- Department of Entomology, Michigan State University, East Lansing, Michigan, 48824, USA.,Kellogg Biological Station, Hickory Corners, Michigan, 49060, USA
| | - Luke N Zehr
- Department of Entomology, Michigan State University, East Lansing, Michigan, 48824, USA
| | - William C Wetzel
- Department of Entomology, Michigan State University, East Lansing, Michigan, 48824, USA.,Kellogg Biological Station, Hickory Corners, Michigan, 49060, USA.,Ecology, Evolutionary Biology, & Behavior, Michigan State University, East Lansing, Michigan, 48824, USA.,AgBioResearch, Michigan State University, East Lansing, Michigan, 48824, USA
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41
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Mottl O, Fibich P, Klimes P, Volf M, Tropek R, Anderson-Teixeira K, Auga J, Blair T, Butterill P, Carscallen G, Gonzalez-Akre E, Goodman A, Kaman O, Lamarre GPA, Libra M, Losada ME, Manumbor M, Miller SE, Molem K, Nichols G, Plowman NS, Redmond C, Seifert CL, Vrana J, Weiblen GD, Novotny V. Spatial covariance of herbivorous and predatory guilds of forest canopy arthropods along a latitudinal gradient. Ecol Lett 2020; 23:1499-1510. [PMID: 32808457 DOI: 10.1111/ele.13579] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 06/15/2020] [Accepted: 06/29/2020] [Indexed: 11/28/2022]
Abstract
In arthropod community ecology, species richness studies tend to be prioritised over those investigating patterns of abundance. Consequently, the biotic and abiotic drivers of arboreal arthropod abundance are still relatively poorly known. In this cross-continental study, we employ a theoretical framework in order to examine patterns of covariance among herbivorous and predatory arthropod guilds. Leaf-chewing and leaf-mining herbivores, and predatory ants and spiders, were censused on > 1000 trees in nine 0.1 ha forest plots. After controlling for tree size and season, we found no negative pairwise correlations between guild abundances per plot, suggestive of weak signals of both inter-guild competition and top-down regulation of herbivores by predators. Inter-guild interaction strengths did not vary with mean annual temperature, thus opposing the hypothesis that biotic interactions intensify towards the equator. We find evidence for the bottom-up limitation of arthropod abundances via resources and abiotic factors, rather than for competition and predation.
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Affiliation(s)
- Ondrej Mottl
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic.,Department of Biological Sciences, University of Bergen, Bergen, Norway
| | - Pavel Fibich
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic
| | - Petr Klimes
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic
| | - Martin Volf
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, DE, Germany
| | - Robert Tropek
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Department of Ecology, Faculty of Science, Charles University, Vinicna 7, Prague, 12843, Czech Republic
| | - Kristina Anderson-Teixeira
- Conservation Ecology Center, Smithsonian Conservation Biology Institute, Front Royal, VA, USA.,Center for Tropical Forest Science- Forest Global Earth Observatory, Smithsonian Tropical Research Institute, Ancon, Panama
| | - John Auga
- The New Guinea Binatang Research Center, P.O. Box 604, Madang, Papua New Guinea
| | - Thomas Blair
- Conservation Ecology Center, Smithsonian Conservation Biology Institute, Front Royal, VA, USA
| | - Phil Butterill
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic.,Department of Ecology, Faculty of Science, Charles University, Vinicna 7, Prague, 12843, Czech Republic
| | - Grace Carscallen
- Department of Biology, The University of Western Ontario, London, Canada
| | - Erika Gonzalez-Akre
- Conservation Ecology Center, Smithsonian Conservation Biology Institute, Front Royal, VA, USA
| | - Aaron Goodman
- Conservation Ecology Center, Smithsonian Conservation Biology Institute, Front Royal, VA, USA
| | - Ondrej Kaman
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic
| | - Greg P A Lamarre
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic.,Center for Tropical Forest Science- Forest Global Earth Observatory, Smithsonian Tropical Research Institute, Ancon, Panama
| | - Martin Libra
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic
| | - Maria E Losada
- National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | - Markus Manumbor
- The New Guinea Binatang Research Center, P.O. Box 604, Madang, Papua New Guinea
| | - Scott E Miller
- National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | - Kenneth Molem
- The New Guinea Binatang Research Center, P.O. Box 604, Madang, Papua New Guinea
| | - Geoffrey Nichols
- Conservation Ecology Center, Smithsonian Conservation Biology Institute, Front Royal, VA, USA
| | - Nichola S Plowman
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic
| | - Conor Redmond
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic
| | - Carlo L Seifert
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic
| | - Jan Vrana
- The Czech University of Life Sciences, Prague, Czech Republic
| | - George D Weiblen
- Bell Museum and Department of Plant & Microbial Biology, University of Minnesota, Saint Paul, MN, USA
| | - Vojtech Novotny
- Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branisovska 1160/31, 370 05, Ceske Budejovice, Czech Republic.,Faculty of Science, University of South Bohemia, Ceske Budejovice, Branisovska 1760, 370 05, Czech Republic
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42
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Pokharel P, Sippel M, Vilcinskas A, Petschenka G. Defense of Milkweed Bugs (Heteroptera: Lygaeinae) against Predatory Lacewing Larvae Depends on Structural Differences of Sequestered Cardenolides. INSECTS 2020; 11:E485. [PMID: 32752003 PMCID: PMC7469174 DOI: 10.3390/insects11080485] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/22/2020] [Accepted: 07/28/2020] [Indexed: 11/17/2022]
Abstract
Predators and parasitoids regulate insect populations and select defense mechanisms such as the sequestration of plant toxins. Sequestration is common among herbivorous insects, yet how the structural variation of plant toxins affects defenses against predators remains largely unknown. The palearctic milkweed bug Lygaeus equestris (Heteroptera: Lygaeinae) was recently shown to sequester cardenolides from Adonis vernalis (Ranunculaceae), while its relative Horvathiolus superbus also obtains cardenolides but from Digitalis purpurea (Plantaginaceae). Remarkably, toxin sequestration protects both species against insectivorous birds, but only H. superbus gains protection against predatory lacewing larvae. Here, we used a full factorial design to test whether this difference was mediated by the differences in plant chemistry or by the insect species. We raised both species of milkweed bugs on seeds from both species of host plants and carried out predation assays using the larvae of the lacewing Chrysoperla carnea. In addition, we analyzed the toxins sequestered by the bugs via liquid chromatography (HPLC). We found that both insect species gained protection by sequestering cardenolides from D. purpurea but not from A. vernalis. Since the total amount of toxins stored was not different between the plant species in H. superbus and even lower in L. equestris from D. purpurea compared to A. vernalis, the effect is most likely mediated by structural differences of the sequestered toxins. Our findings indicate that predator-prey interactions are highly context-specific and that the host plant choice can affect the levels of protection to various predator types based on structural differences within the same class of chemical compounds.
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Affiliation(s)
- Prayan Pokharel
- Institute of Phytomedicine, University of Hohenheim, 70599 Stuttgart, Germany;
| | - Marlon Sippel
- Institute for Insect Biotechnology, Justus Liebig University Giessen, 35392 Giessen, Germany; (M.S.); (A.V.)
| | - Andreas Vilcinskas
- Institute for Insect Biotechnology, Justus Liebig University Giessen, 35392 Giessen, Germany; (M.S.); (A.V.)
| | - Georg Petschenka
- Institute of Phytomedicine, University of Hohenheim, 70599 Stuttgart, Germany;
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43
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Berke SK, Keller EL, Needham CN, Salerno CR. Grazer Interactions with Invasive Agarophyton vermiculophyllum (Rhodophyta): Comparisons to Related versus Unrelated Native Algae. THE BIOLOGICAL BULLETIN 2020; 238:145-153. [PMID: 32597719 DOI: 10.1086/709108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Ecosystem responses to invasion are strongly influenced by interactions between invaders and native species. If native species provide biotic resistance by consuming or competing with an invader, the invasion may be slowed, and/or invasive populations may be limited. If local herbivores recognize an invasive plant as being similar to native species, they may graze it more readily. Biotic resistance is thus generally predicted to increase if the invader is phylogenetically related to natives. However, if the native species were unpalatable, then grazers may be predisposed to avoid the invader, thus reducing biotic resistance from consumption. In the marine realm, invertebrate grazers often avoid feeding on invasive algae. However, tests comparing macroalgal invaders to phylogenetically related natives have been rare. Here we present data for invertebrate grazing and habitat use of (i) invasive Agarophyton vermiculophyllum (Rhodophyta: Gracilariales: Gracilarieae), (ii) the native contribal species Gracilaria tikvahiae, and (iii) an unrelated native, Ulva sp., the most common native alga in the system. We find that grazers prefer Ulva over both Gracilarieae, both for feeding and for habitat use. These data suggest that biotic resistance from consumption is low and not enhanced by the presence of a closely related native alga.
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44
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Decker LE, Hunter MD. Interspecific variation and elevated CO 2 influence the relationship between plant chemical resistance and regrowth tolerance. Ecol Evol 2020; 10:5416-5430. [PMID: 32607163 PMCID: PMC7319169 DOI: 10.1002/ece3.6284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 03/30/2020] [Indexed: 12/04/2022] Open
Abstract
To understand how comprehensive plant defense phenotypes will respond to global change, we investigated the legacy effects of elevated CO2 on the relationships between chemical resistance (constitutive and induced via mechanical damage) and regrowth tolerance in four milkweed species (Asclepias). We quantified potential resistance and tolerance trade-offs at the physiological level following simulated mowing, which are relevant to milkweed ecology and conservation. We examined the legacy effects of elevated CO2 on four hypothesized trade-offs between the following: (a) plant growth rate and constitutive chemical resistance (foliar cardenolide concentrations), (b) plant growth rate and mechanically induced chemical resistance, (c) constitutive resistance and regrowth tolerance, and (d) regrowth tolerance and mechanically induced resistance. We observed support for one trade-off between plant regrowth tolerance and mechanically induced resistance traits that was, surprisingly, independent of CO2 exposure. Across milkweed species, mechanically induced resistance increased by 28% in those plants previously exposed to elevated CO2. In contrast, constitutive resistance and the diversity of mechanically induced chemical resistance traits declined in response to elevated CO2 in two out of four milkweed species. Finally, previous exposure to elevated CO2 uncoupled the positive relationship between plant growth rate and regrowth tolerance following damage. Our data highlight the complex and dynamic nature of plant defense phenotypes under environmental change and question the generality of physiologically based defense trade-offs.
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Affiliation(s)
| | - Mark D. Hunter
- Department of Ecology and Evolutionary BiologyUniversity of MichiganBiological Sciences BuildingAnn ArborMIUSA
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45
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Saul-Gershenz L, Grodsky SM, Hernandez RR. Ecology of the Western Queen Butterfly Danaus gilippus thersippus (Lepidoptera: Nymphalidae) in the Mojave and Sonoran Deserts. INSECTS 2020; 11:insects11050315. [PMID: 32438741 PMCID: PMC7290759 DOI: 10.3390/insects11050315] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 05/11/2020] [Accepted: 05/12/2020] [Indexed: 01/09/2023]
Abstract
The purpose of this study was to assess the ecological knowledge surrounding the western queen butterfly, Danaus gilippus thersippus (H. Bates). Specifically, our objectives were to synthesize existing data and knowledge on the ecology of the queen and use results of this assessment to inform the direction of future research on this understudied species. We identified six core areas for assessment: distribution, the biodiversity of plant resources, western queen and their host plant phenology, chemical ecology, and four key life history traits. We mapped the distribution of D. g. thersippus from museum specimen records, citizen science (e.g., iNaturalist) and image sharing app-based observations, along with other observational data enumerating all current known plant resources and long-range movements. We assembled 14 larval food plants, six pyrrolizidine alkaloids plants and six nectar plants distributed in the western Mojave and Sonoran Desert regions of the United States and Baja California. We report on its phenology and its long-range movement. Butterfly species have declined across the western US, and western monarch populations have declined by 97%. Danaus g. thersippus has received little research attention compared with its famous congener D. plexippus L. Danaus g. thersippus' desert distribution may be at its temperature limits for the species distribution and for its rare host plant Asclepias nyctaginifolia.
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Affiliation(s)
- Leslie Saul-Gershenz
- Wild Energy Initiative, John Muir Institute of the Environment, University of California, Davis, 1 Shields Ave., Davis, CA 95616, USA; (S.M.G.); (R.R.H.)
- Department of Entomology and Nematology, 1 Shields Ave., University of California, Davis, Davis, CA 95616, USA
- USDA-ARS, Invasive Species and Pollinator Health Research Unit, 3026 Bee Biology Rd, Davis, CA 95616, USA
- Correspondence:
| | - Steven M. Grodsky
- Wild Energy Initiative, John Muir Institute of the Environment, University of California, Davis, 1 Shields Ave., Davis, CA 95616, USA; (S.M.G.); (R.R.H.)
| | - Rebecca R. Hernandez
- Wild Energy Initiative, John Muir Institute of the Environment, University of California, Davis, 1 Shields Ave., Davis, CA 95616, USA; (S.M.G.); (R.R.H.)
- Department of Land, Air, and Water Resources, 1 Shields Ave., University of California, Davis, Davis, CA 95616, USA
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46
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Howe M, Mason CJ, Gratton C, Keefover‐Ring K, Wallin K, Yanchuk A, Zhu J, Raffa KF. Relationships between conifer constitutive and inducible defenses against bark beetles change across levels of biological and ecological scale. OIKOS 2020. [DOI: 10.1111/oik.07242] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Michael Howe
- Dept of Entomology, Univ. of Wisconsin‐Madison Madison WI 53706 USA
| | - Charles J. Mason
- Dept of Entomology, Pennsylvania State Univ., University Park PA USA
| | - Claudio Gratton
- Dept of Entomology, Univ. of Wisconsin‐Madison Madison WI 53706 USA
| | - Ken Keefover‐Ring
- Depts of Botany and Geography, Univ. of Wisconsin‐Madison Madison WI USA
| | - Kimberly Wallin
- College of Science and Mathematics, North Dakota State Univ. Fargo ND USA
| | - Alvin Yanchuk
- Ministry of Forests, Lands, Natural Resource Operations & Rural Development, Government of British Columbia Victoria BC Canada
| | - Jun Zhu
- Dept of Statistics, Univ. of Wisconsin‐Madison Madison WI USA
| | - Kenneth F. Raffa
- Dept of Entomology, Univ. of Wisconsin‐Madison Madison WI 53706 USA
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47
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Moreira X, Abdala-Roberts L, Bruun HH, Covelo F, De Frenne P, Galmán A, Gaytán Á, Jaatinen R, Pulkkinen P, Ten Hoopen JPJG, Timmermans BGH, Tack AJM, Castagneyrol B. Latitudinal variation in seed predation correlates with latitudinal variation in seed defensive and nutritional traits in a widespread oak species. ANNALS OF BOTANY 2020; 125:881-890. [PMID: 31858135 PMCID: PMC7218813 DOI: 10.1093/aob/mcz207] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 12/17/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND AND AIMS Classic theory on geographical gradients in plant-herbivore interactions assumes that herbivore pressure and plant defences increase towards warmer and more stable climates found at lower latitudes. However, the generality of these expectations has been recently called into question by conflicting empirical evidence. One possible explanation for this ambiguity is that most studies have reported on patterns of either herbivory or plant defences whereas few have measured both, thus preventing a full understanding of the implications of observed patterns for plant-herbivore interactions. In addition, studies have typically not measured climatic factors affecting plant-herbivore interactions, despite their expected influence on plant and herbivore traits. METHODS Here we tested for latitudinal variation in insect seed predation and seed traits putatively associated with insect attack across 36 Quercus robur populations distributed along a 20° latitudinal gradient. We then further investigated the associations between climatic factors, seed traits and seed predation to test for climate-based mechanisms of latitudinal variation in seed predation. KEY RESULTS We found strong but contrasting latitudinal clines in seed predation and seed traits, whereby seed predation increased whereas seed phenolics and phosphorus decreased towards lower latitudes. We also found a strong direct association between temperature and seed predation, with the latter increasing towards warmer climates. In addition, temperature was negatively associated with seed traits, with populations at warmer sites having lower levels of total phenolics and phosphorus. In turn, these negative associations between temperature and seed traits led to a positive indirect association between temperature and seed predation. CONCLUSIONS These results help unravel how plant-herbivore interactions play out along latitudinal gradients and expose the role of climate in driving these outcomes through its dual effects on plant defences and herbivores. Accordingly, this emphasizes the need to account for abiotic variation while testing concurrently for latitudinal variation in plant traits and herbivore pressure.
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Affiliation(s)
- Xoaquín Moreira
- Misión Biológica de Galicia (MBG-CSIC), Pontevedra, Galicia, Spain
| | - Luis Abdala-Roberts
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Itzimná, Mérida, Yucatán, Mexico
| | - Hans Henrik Bruun
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Felisa Covelo
- Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Sevilla, Spain
| | | | - Andrea Galmán
- Misión Biológica de Galicia (MBG-CSIC), Pontevedra, Galicia, Spain
| | - Álvaro Gaytán
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Raimo Jaatinen
- Natural Resources Institute Finland, Haapastensyrjä Breeding Station, Läyliäinen, Finland
| | - Pertti Pulkkinen
- Natural Resources Institute Finland, Haapastensyrjä Breeding Station, Läyliäinen, Finland
| | | | - Bart G H Timmermans
- Department of Agriculture, Louis Bolk Institute, LA Driebergen, the Netherlands
| | - Ayco J M Tack
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
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48
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Züst T, Strickler SR, Powell AF, Mabry ME, An H, Mirzaei M, York T, Holland CK, Kumar P, Erb M, Petschenka G, Gómez JM, Perfectti F, Müller C, Pires JC, Mueller LA, Jander G. Independent evolution of ancestral and novel defenses in a genus of toxic plants ( Erysimum, Brassicaceae). eLife 2020; 9:e51712. [PMID: 32252891 PMCID: PMC7180059 DOI: 10.7554/elife.51712] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 03/24/2020] [Indexed: 11/13/2022] Open
Abstract
Phytochemical diversity is thought to result from coevolutionary cycles as specialization in herbivores imposes diversifying selection on plant chemical defenses. Plants in the speciose genus Erysimum (Brassicaceae) produce both ancestral glucosinolates and evolutionarily novel cardenolides as defenses. Here we test macroevolutionary hypotheses on co-expression, co-regulation, and diversification of these potentially redundant defenses across this genus. We sequenced and assembled the genome of E. cheiranthoides and foliar transcriptomes of 47 additional Erysimum species to construct a phylogeny from 9868 orthologous genes, revealing several geographic clades but also high levels of gene discordance. Concentrations, inducibility, and diversity of the two defenses varied independently among species, with no evidence for trade-offs. Closely related, geographically co-occurring species shared similar cardenolide traits, but not glucosinolate traits, likely as a result of specific selective pressures acting on each defense. Ancestral and novel chemical defenses in Erysimum thus appear to provide complementary rather than redundant functions.
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Affiliation(s)
- Tobias Züst
- Institute of Plant Sciences, University of BernBernSwitzerland
| | | | | | - Makenzie E Mabry
- Division of Biological Sciences, University of MissouriColumbiaUnited States
| | - Hong An
- Division of Biological Sciences, University of MissouriColumbiaUnited States
| | | | | | | | | | - Matthias Erb
- Institute of Plant Sciences, University of BernBernSwitzerland
| | - Georg Petschenka
- Institut für Insektenbiotechnologie, Justus-Liebig-Universität GiessenGiessenGermany
| | - José-María Gómez
- Department of Functional and Evolutionary Ecology, Estación Experimental de Zonas Áridas (EEZA-CSIC)AlmeríaSpain
| | - Francisco Perfectti
- Research Unit Modeling Nature, Department of Genetics, University of GranadaGranadaSpain
| | - Caroline Müller
- Department of Chemical Ecology, Bielefeld UniversityBielefeldGermany
| | - J Chris Pires
- Division of Biological Sciences, University of MissouriColumbiaUnited States
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49
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Kergunteuil A, Humair L, Maire AL, Moreno-Aguilar MF, Godschalx A, Catalán P, Rasmann S. Tritrophic interactions follow phylogenetic escalation and climatic adaptation. Sci Rep 2020; 10:2074. [PMID: 32034273 PMCID: PMC7005781 DOI: 10.1038/s41598-020-59068-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 01/24/2020] [Indexed: 11/29/2022] Open
Abstract
One major goal in plant evolutionary ecology is to address how and why tritrophic interactions mediated by phytochemical plant defences vary across species, space, and time. In this study, we tested three classical hypotheses about plant defences: (i) the resource-availability hypothesis, (ii) the altitudinal/elevational gradient hypothesis and (iii) the defence escalation hypothesis. For this purpose, predatory soil nematodes were challenged to hunt for root herbivores based on volatile cues from damaged or intact roots of 18 Alpine Festuca grass species adapted to distinct climatic niches spanning 2000 meters of elevation. We found that adaptation into harsh, nutrient-limited alpine environments coincided with the production of specific blends of volatiles, highly attractive for nematodes. We also found that recently-diverged taxa exposed to herbivores released higher amounts of volatiles than ancestrally-diverged species. Therefore, our model provides evidence that belowground indirect plant defences associated with tritrophic interactions have evolved under two classical hypotheses in plant ecology. While phylogenetic drivers of volatile emissions point to the defence-escalation hypothesis, plant local adaptation of indirect defences is in line with the resource availability hypothesis.
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Affiliation(s)
- Alan Kergunteuil
- Institute of Biology, University of Neuchâtel, Rue Emile-Argand 11, 2000, Neuchâtel, Switzerland
- INRAE, UMR Laboratoire d'Agronomie et Environnement, Vandoeuvre-lès, 54518, Nancy, France
| | - Laureline Humair
- Institute of Biology, University of Neuchâtel, Rue Emile-Argand 11, 2000, Neuchâtel, Switzerland
| | - Anne-Laure Maire
- Botanical Garden Neuchâtel, Chemin du Pertuis-du-Sault 58, 2000, Neuchâtel, Switzerland
| | - María Fernanda Moreno-Aguilar
- Departamento de Ciencias Agrarias y del Medio Natural, Escuela Politécnica Superior de Huesca, Universidad de Zaragoza, Ctra. Cuarte km 1, 22071, Huesca, Spain
| | - Adrienne Godschalx
- INRAE, UMR Laboratoire d'Agronomie et Environnement, Vandoeuvre-lès, 54518, Nancy, France
| | - Pilar Catalán
- Departamento de Ciencias Agrarias y del Medio Natural, Escuela Politécnica Superior de Huesca, Universidad de Zaragoza, Ctra. Cuarte km 1, 22071, Huesca, Spain
- Grupo de Bioquímica, Biofísica y Biología Computacional (BIFI, UNIZAR), Unidad Asociada al CSIC, Zaragoza, Spain
- Department of Botany, Institute of Biology, Tomsk State University, Lenin Av. 36, Tomsk, 634050, Russia
| | - Sergio Rasmann
- Institute of Biology, University of Neuchâtel, Rue Emile-Argand 11, 2000, Neuchâtel, Switzerland.
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50
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Baskett CA, Schroeder L, Weber MG, Schemske DW. Multiple metrics of latitudinal patterns in insect pollination and herbivory for a tropical‐temperate congener pair. ECOL MONOGR 2020. [DOI: 10.1002/ecm.1397] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Carina A. Baskett
- Department of Plant Biology Ecology, Evolutionary Biology, and Behavior Program Michigan State University East Lansing Michigan 48824 USA
| | - Lucy Schroeder
- Department of Plant Biology Michigan State University East Lansing Michigan 48824 USA
| | - Marjorie G. Weber
- Department of Plant Biology Ecology, Evolutionary Biology, and Behavior Program Michigan State University East Lansing Michigan 48824 USA
| | - Douglas W. Schemske
- Department of Plant Biology Ecology, Evolutionary Biology, and Behavior Program Michigan State University East Lansing Michigan 48824 USA
- W.K. Kellogg Biological Station Michigan State University Hickory Corners Michigan 49060 USA
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