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Grele A, Massad TJ, Uckele KA, Dyer LA, Antonini Y, Braga L, Forister ML, Sulca L, Kato M, Lopez HG, Nascimento AR, Parchman T, Simbaña WR, Smilanich AM, Stireman JO, Tepe EJ, Walla T, Richards LA. Intra- and interspecific diversity in a tropical plant clade alter herbivory and ecosystem resilience. eLife 2024; 12:RP86988. [PMID: 38662411 PMCID: PMC11045218 DOI: 10.7554/elife.86988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024] Open
Abstract
Declines in biodiversity generated by anthropogenic stressors at both species and population levels can alter emergent processes instrumental to ecosystem function and resilience. As such, understanding the role of biodiversity in ecosystem function and its response to climate perturbation is increasingly important, especially in tropical systems where responses to changes in biodiversity are less predictable and more challenging to assess experimentally. Using large-scale transplant experiments conducted at five neotropical sites, we documented the impacts of changes in intraspecific and interspecific plant richness in the genus Piper on insect herbivory, insect richness, and ecosystem resilience to perturbations in water availability. We found that reductions of both intraspecific and interspecific Piper diversity had measurable and site-specific effects on herbivory, herbivorous insect richness, and plant mortality. The responses of these ecosystem-relevant processes to reduced intraspecific Piper richness were often similar in magnitude to the effects of reduced interspecific richness. Increased water availability reduced herbivory by 4.2% overall, and the response of herbivorous insect richness and herbivory to water availability were altered by both intra- and interspecific richness in a site-dependent manner. Our results underscore the role of intraspecific and interspecific richness as foundations of ecosystem function and the importance of community and location-specific contingencies in controlling function in complex tropical systems.
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Affiliation(s)
- Ari Grele
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology, University of NevadaRenoUnited States
| | - Tara J Massad
- Department of Scientific Services, Gorongosa National ParkSofalaMozambique
| | - Kathryn A Uckele
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology, University of NevadaRenoUnited States
| | - Lee A Dyer
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology, University of NevadaRenoUnited States
- Hitchcock Center for Chemical Ecology, University of NevadaRenoUnited States
| | - Yasmine Antonini
- Lab. de Biodiversidade, Departamento de Biodiversidade, Evolução e Meio Ambiente, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro PretoOuro PretoBrazil
| | - Laura Braga
- Lab. de Biodiversidade, Departamento de Biodiversidade, Evolução e Meio Ambiente, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro PretoOuro PretoBrazil
| | - Matthew L Forister
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology, University of NevadaRenoUnited States
- Hitchcock Center for Chemical Ecology, University of NevadaRenoUnited States
| | - Lidia Sulca
- Departamento de Entomología, Museo de Historia Natural, Universidad Nacional Mayor de San MarcosLimaPeru
| | - Massuo Kato
- Department of Fundamental Chemistry, Institute of Chemistry, University of São PauloSão PauloBrazil
| | - Humberto G Lopez
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology, University of NevadaRenoUnited States
| | | | - Thomas Parchman
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology, University of NevadaRenoUnited States
- Department of Biology, University of NevadaRenoUnited States
| | | | - Angela M Smilanich
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology, University of NevadaRenoUnited States
| | - John O Stireman
- Department of Biological Sciences, Wright State UniversityDaytonUnited States
| | - Eric J Tepe
- Department of Biological Sciences, University of CincinnatiCincinnatiUnited States
| | - Thomas Walla
- Department of Biology, Mesa State CollegeGrand JunctionUnited States
| | - Lora A Richards
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology, University of NevadaRenoUnited States
- Hitchcock Center for Chemical Ecology, University of NevadaRenoUnited States
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2
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Meyer GA, Leroux SJ. A theory for context-dependent effects of mammalian trampling on ecosystem nitrogen cycling. J Anim Ecol 2024. [PMID: 38566364 DOI: 10.1111/1365-2656.14066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 02/06/2024] [Indexed: 04/04/2024]
Abstract
Large mammalian herbivores substantially impact ecosystem functioning. As their populations are dramatically altered globally, disentangling their consumptive and non-consumptive effects is critical to advance mechanistic understanding and improve prediction of effects over ecosystem and Earth-system spatial extents. Mathematical models have played an important role in clarifying potential mechanisms of herbivore zoogeochemistry, based mostly on their consumptive effects as primary consumers and recyclers of organic and inorganic matter via defecation and urination. Trampling is a ubiquitous effect among walking vertebrates, but the consequences and potential mechanisms of trampling in diverse environments remain poorly understood. We derive a novel mathematical model of large mammalian herbivore effects on ecosystem nitrogen cycling, focusing on how trampling and environmental context impact soil processes. We model herbivore trampling with a linear positive or negative additive effect on soil-mediated nitrogen cycling processes. Combining analytical and numerical analyses, we find trampling by large mammalian herbivores is likely to decrease nitrogen mineralisation rate across diverse environments, such as temperate grassland and boreal forest. These effects are mediated by multiple potential mechanisms, including trampling-induced changes to detritivore biomass and functioning (e.g. rate of organic matter consumption). We also uncover scenarios where trampling can increase nitrogen mineralisation rate, contingent on the environment-specific relative sensitivity of detritivore mineral-nitrogen release and detritivore mortality, to trampling. In contrast to some consumptive mechanisms, our results suggest the pace of soil nitrogen cycling prior to trampling has little influence over the direction of the trampling net effect on nitrogen mineralisation, but that net effects may be greater in slow-cycling systems (e.g. boreal forests) than in fast-cycling systems (e.g. grasslands). Our model clarifies the potential consequences of previously overlooked mechanisms of zoogeochemistry that are common to all terrestrial biomes. Our results provide empirically testable predictions to guide future progress in empirical and theoretical studies of herbivore effects in diverse environmental contexts. Resolving ecological contingencies around animal consumptive and non-consumptive effects will improve whole-ecosystem management efforts such as restoration and rewilding.
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Affiliation(s)
- G Adam Meyer
- Department of Biology, Memorial University of Newfoundland and Labrador, St. John's, Newfoundland, Canada
| | - Shawn J Leroux
- Department of Biology, Memorial University of Newfoundland and Labrador, St. John's, Newfoundland, Canada
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3
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Calixto ES, de Oliveira Pimenta IC, Lange D, Marquis RJ, Torezan-Silingardi HM, Del-Claro K. Emerging Trends in Ant-Pollinator Conflict in Extrafloral Nectary-Bearing Plants. Plants (Basel) 2024; 13:651. [PMID: 38475497 DOI: 10.3390/plants13050651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 02/23/2024] [Accepted: 02/25/2024] [Indexed: 03/14/2024]
Abstract
The net outcomes of mutualisms are mediated by the trade-offs between the costs and benefits provided by both partners. Our review proposes the existence of a trade-off in ant protection mutualisms between the benefits generated by the ants' protection against the attack of herbivores and the losses caused by the disruption of pollination processes, which are commonly not quantified. This trade-off has important implications for understanding the evolution of extrafloral nectaries (EFNs), an adaptation that has repeatedly evolved throughout the flowering plant clade. We propose that the outcome of this trade-off is contingent on the specific traits of the organisms involved. We provide evidence that the protective mutualisms between ants and plants mediated by EFNs have optimal protective ant partners, represented by the optimum point of the balance between positive effects on plant protection and negative effects on pollination process. Our review also provides important details about a potential synergism of EFN functionality; that is, these structures can attract ants to protect against herbivores and/or distract them from flowers so as not to disrupt pollination processes. Finally, we argue that generalizations regarding how ants impact plants should be made with caution since ants' effects on plants vary with the identity of the ant species in their overall net outcome.
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Affiliation(s)
| | | | - Denise Lange
- Department of Biology, Federal University of Technology-Parana, Campus Santa Helena, Santa Helena, Curitiba 80230-901, PR, Brazil
| | - Robert J Marquis
- Department of Biology and the Whitney R. Harris World Ecology Center, University of Missouri, St. Louis, MO 63121, USA
| | - Helena Maura Torezan-Silingardi
- Postgraduation Program in Entomology, Department of Biology, University of São Paulo, Ribeirão Preto 14040-900, SP, Brazil
- Institute of Biology, Universidade Federal de Uberlândia, Uberlândia 38405-240, MG, Brazil
| | - Kleber Del-Claro
- Postgraduation Program in Entomology, Department of Biology, University of São Paulo, Ribeirão Preto 14040-900, SP, Brazil
- Institute of Biology, Universidade Federal de Uberlândia, Uberlândia 38405-240, MG, Brazil
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Jarrett BJM, Miller CW. Host Plant Effects on Sexual Selection Dynamics in Phytophagous Insects. Annu Rev Entomol 2024; 69:41-57. [PMID: 37562047 DOI: 10.1146/annurev-ento-022823-020258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
Natural selection is notoriously dynamic in nature, and so, too, is sexual selection. The interactions between phytophagous insects and their host plants have provided valuable insights into the many ways in which ecological factors can influence sexual selection. In this review, we highlight recent discoveries and provide guidance for future work in this area. Importantly, host plants can affect both the agents of sexual selection (e.g., mate choice and male-male competition) and the traits under selection (e.g., ornaments and weapons). Furthermore, in our rapidly changing world, insects now routinely encounter new potential host plants. The process of adaptation to a new host may be hindered or accelerated by sexual selection, and the unexplored evolutionary trajectories that emerge from these dynamics are relevant to pest management and insect conservation strategies. Examining the effects of host plants on sexual selection has the potential to advance our fundamental understanding of sexual conflict, host range evolution, and speciation, with relevance across taxa.
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Affiliation(s)
- Benjamin J M Jarrett
- School of Natural Sciences, Bangor University, Bangor, United Kingdom;
- Department of Biology, Lund University, Lund, Sweden
- Department of Entomology and Nematology, University of Florida, Gainesville, Florida, USA;
| | - Christine W Miller
- Department of Entomology and Nematology, University of Florida, Gainesville, Florida, USA;
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Osinde C, Sobhy IS, Wari D, Dinh ST, Hojo Y, Osibe DA, Shinya T, Tugume AK, Nsubuga AM, Galis I. Comparative analysis of sorghum (C4) and rice (C3) plant headspace volatiles induced by artificial herbivory. Plant Signal Behav 2023; 18:2243064. [PMID: 37585707 PMCID: PMC10730142 DOI: 10.1080/15592324.2023.2243064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 07/24/2023] [Accepted: 07/25/2023] [Indexed: 08/18/2023]
Abstract
Acute stress responses include release of defensive volatiles from herbivore-attacked plants. Here we used two closely related monocot species, rice as a representative C3 plant, and sorghum as a representative C4 plant, and compared their basal and stress-induced headspace volatile organic compounds (VOCs). Although both plants emitted similar types of constitutive and induced VOCs, in agreement with the close phylogenetic relationship of the species, several mono- and sesquiterpenes have been significantly less abundant in headspace of sorghum relative to rice. Furthermore, in spite of generally lower VOC levels, some compounds, such as the green leaf volatile (Z)-3-hexenyl acetate and homoterpene DMNT, remained relatively high in the sorghum headspace, suggesting that a separate mechanism for dispersal of these compounds may have evolved in this plant. Finally, a variable amount of several VOCs among three sorghum cultivars of different geographical origins suggested that release of VOCs could be used as a valuable resource for the increase of sorghum resistance against herbivores.
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Affiliation(s)
- Cyprian Osinde
- Department of Plant Sciences, Microbiology and Biotechnology Makerere University, Kampala, Uganda
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
| | - Islam S. Sobhy
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
- Department of Plant Protection, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt
- School of Biosciences, Cardiff University, Cardiff, UK
| | - David Wari
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
| | - Son Truong Dinh
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
- Faculty of Biotechnology, Vietnam National University of Agriculture, Hanoi, Vietnam
| | - Yuko Hojo
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
| | - Dandy A. Osibe
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
- Department of Plant Science and Biotechnology, University of Nigeria, Nsukka, Nigeria
| | - Tomonori Shinya
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
| | - Arthur K. Tugume
- Department of Plant Sciences, Microbiology and Biotechnology Makerere University, Kampala, Uganda
| | - Anthony M. Nsubuga
- Department of Plant Sciences, Microbiology and Biotechnology Makerere University, Kampala, Uganda
| | - Ivan Galis
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
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Shapira T, Roth T, Bar A, Coll M, Mandelik Y. Complex Effects of a Land-Use Gradient on Pollinators and Natural Enemies: Natural Habitats Mitigate the Effects of Aphid Infestation on Pollination Services. Insects 2023; 14:872. [PMID: 37999071 PMCID: PMC10672408 DOI: 10.3390/insects14110872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 11/07/2023] [Accepted: 11/07/2023] [Indexed: 11/25/2023]
Abstract
Pollinators and natural enemies are essential ecosystem service providers influenced by land-use and by interactions between them. However, the understanding of the combined impacts of these factors on pollinator and natural enemy activities and their ultimate effects on plant productivity remains limited. We investigated the effects of local and landscape vegetation characteristics and the presence of herbivorous pests on pollination and biological control services and their combined influence on phytometer seed set. The study was conducted in a Mediterranean agro-ecosystem, encompassing ten shrubland plots spanning a land-use gradient. Within each plot, we placed caged and uncaged potted phytometer plants that were either aphid-infested or aphid-free. We quantified insect flower visitation, aphid predation and parasitism rates, and fruit and seed set. We found scale-dependent responses of pollinators and natural enemies to land-use characteristics. Flower species richness had a positive impact on aphid parasitism rates but a negative effect on pollinator activity. Notably, we found a more pronounced positive effect of natural areas on pollinator activity in aphid-infested compared to aphid-free plants, indicating a potentially critical role of natural habitats in mitigating the adverse effects of aphid infestation on pollination services. These results highlight the complex and interactive effects of land-use on pollinators and natural enemies, with significant implications for plant productivity.
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Affiliation(s)
- Tal Shapira
- Department of Entomology, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.S.); (T.R.); (M.C.)
- The Advanced School for Environmental Studies, The Hebrew University of Jerusalem, Rehovot 7612001, Israel
| | - Tohar Roth
- Department of Entomology, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.S.); (T.R.); (M.C.)
| | - Adi Bar
- Department of Entomology, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.S.); (T.R.); (M.C.)
| | - Moshe Coll
- Department of Entomology, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.S.); (T.R.); (M.C.)
| | - Yael Mandelik
- Department of Entomology, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (T.S.); (T.R.); (M.C.)
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Wen L, Cao J, Li W, Guo Y. Changes in volatile profile and related gene expression during senescence of tobacco leaves. J Sci Food Agric 2023; 103:6540-6552. [PMID: 37223951 DOI: 10.1002/jsfa.12733] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 12/30/2022] [Accepted: 05/24/2023] [Indexed: 05/25/2023]
Abstract
BACKGROUND Volatile organic compounds are critical for food flavor and play important roles in plant-plant interactions and plants' communications with the environment. Tobacco is well-studied for secondary metabolism and most of the typical flavor substances in tobacco leaves are generated at the mature stage of leaf development. However, the changes in volatiles during leaf senescence are rarely studied. RESULTS The volatile composition of tobacco leaves at different stages of senescence was characterized for the first time. Comparative volatile profiling of tobacco leaves at different stages was performed using solid-phase microextraction coupled with gas chromatography/mass spectrometry. In total, 45 volatile compounds were identified and quantified, including terpenoids, green leaf volatiles (GLVs), phenylpropanoids, Maillard reaction products, esters, and alkanes. Most of the volatile compounds showed differential accumulation during leaf senescence. Some terpenoids, including neophytadiene, β-springene, and 6-methyl-5-hepten-2-one, increased significantly with the progress of leaf senescence. Hexanal and phenylacetaldehyde also showed increased accumulation in leaves during senescence. The results from gene expression profiling indicated that genes involved in metabolism of terpenoids, phenylpropanoids, and GLVs were differentially expressed during leaf yellowing. CONCLUSION Dynamic changes in volatile compounds during tobacco leaf senescence are observed and the integration of gene-metabolites datasets offers important readouts for the genetic control of volatile production during the process of leaf senescence. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Lichao Wen
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Jianmin Cao
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Wei Li
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Yongfeng Guo
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
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Tian Z, Li W, Kou Y, Dong X, Liu H, Yang X, Dong Q, Chen T. Effects of Different Livestock Grazing on Foliar Fungal Diseases in an Alpine Grassland on the Qinghai-Tibet Plateau. J Fungi (Basel) 2023; 9:949. [PMID: 37755057 PMCID: PMC10533196 DOI: 10.3390/jof9090949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 09/15/2023] [Accepted: 09/19/2023] [Indexed: 09/28/2023] Open
Abstract
In grassland ecosystems, the occurrence and transmission of foliar fungal diseases are largely dependent on grazing by large herbivores. However, whether herbivores that have different body sizes differentially impact foliar fungal diseases remains largely unexplored. Thus, we conducted an 8-year grazing experiment in an alpine grassland on the Qinghai-Tibet Plateau in China and tested how different types of livestock (sheep (Ovis aries), yak (Bos grunniens), or both)) affected foliar fungal diseases at the levels of both plant population and community. At the population level, grazing by a single species (yak or sheep) or mixed species (sheep and yak) significantly decreased the severity of eight leaf spot diseases. Similarly, at the community level, both single species (yak or sheep) and mixed grazing by both sheep and yak significantly decreased the community pathogen load. However, we did not find a significant difference in the community pathogen load among different types of livestock. These results suggest that grazing by large herbivores, independently of livestock type, consistently decreased the prevalence of foliar fungal diseases at both the plant population and community levels. We suggest that moderate grazing by sheep or yak is effective to control the occurrence of foliar fungal diseases in alpine grasslands. This study advances our knowledge of the interface between disease ecology, large herbivores, and grassland science.
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Affiliation(s)
- Zhen Tian
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (Z.T.); (W.L.); (Y.K.); (X.D.); (H.L.)
| | - Wenjie Li
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (Z.T.); (W.L.); (Y.K.); (X.D.); (H.L.)
| | - Yixin Kou
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (Z.T.); (W.L.); (Y.K.); (X.D.); (H.L.)
| | - Xin Dong
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (Z.T.); (W.L.); (Y.K.); (X.D.); (H.L.)
| | - Huining Liu
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (Z.T.); (W.L.); (Y.K.); (X.D.); (H.L.)
| | - Xiaoxia Yang
- Qinghai Provincial Key Laboratory of Adaptive Management on Alpine Grassland, Qinghai Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining 810016, China; (X.Y.); (Q.D.)
| | - Quanmin Dong
- Qinghai Provincial Key Laboratory of Adaptive Management on Alpine Grassland, Qinghai Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining 810016, China; (X.Y.); (Q.D.)
| | - Tao Chen
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (Z.T.); (W.L.); (Y.K.); (X.D.); (H.L.)
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9
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Liu Y, Heath JJ, Zhang S, van Wijk M, Wang G, Buellesbach J, Wada-Katsumata A, Groot AT, Schal C. A mosaic of endogenous and plant-derived courtship signals in moths. Curr Biol 2023; 33:3529-3535.e4. [PMID: 37531958 DOI: 10.1016/j.cub.2023.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 06/17/2023] [Accepted: 07/07/2023] [Indexed: 08/04/2023]
Abstract
Insects rely on olfaction to guide a wide range of adaptive behaviors, including mate and food localization, mate choice, oviposition site selection, kin recognition, and predator avoidance.1 In nocturnal insects, such as moths2 and cockroaches,3 mate finding is stimulated predominantly by long-range species-specific sex pheromones, typically emitted by females. During courtship, at close range, males in most moth species emit a blend of pheromone compounds from an everted, often large, pheromone gland. While long-distance communication with sex pheromones has been remarkably well characterized in thousands of moth species,2,4 close-range chemosensory sexual communication remains poorly understood. We reveal that in the moth Chloridea virescens, the male pheromone consists of three distinct classes of compounds: de novo biosynthesized alcohols, aldehydes, acetates, and carboxylic acids that resemble the female's emissions; newly identified compounds that are unique to the male pheromone, such as aliphatic polyunsaturated hydrocarbons; and sequestered plant secondary compounds and hormone derivatives, including methyl salicylate (MeSA). Thus, males employ a mosaic pheromone blend of disparate origins that may serve multiple functions during courtship. We show that two olfactory receptors in female antennae are tuned to MeSA, which facilitates female acceptance of the male. Because MeSA is emitted by plants attacked by pathogens and herbivores,5 the chemosensory system of female moths was likely already tuned to this plant volatile, and males appear to exploit the female's preadapted sensory bias. Interestingly, while female moths (largely nocturnal) and butterflies (diurnal) diverged in their use of sensory modalities in sexual communication,6 MeSA is used by males of both lineages.
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Affiliation(s)
- Yang Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA.
| | - Jeremy J Heath
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA
| | - Sai Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Michiel van Wijk
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA; Department of Evolutionary and Population Biology, University of Amsterdam, Amsterdam, the Netherlands
| | - Guirong Wang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Jan Buellesbach
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA
| | - Ayako Wada-Katsumata
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA
| | - Astrid T Groot
- Department of Evolutionary and Population Biology, University of Amsterdam, Amsterdam, the Netherlands
| | - Coby Schal
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA.
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Hamza A, Farooq MO, Razaq M, Shah FM. Organic farming of maize crop enhances species evenness and diversity of hexapod predators. Bull Entomol Res 2023; 113:565-573. [PMID: 37434448 DOI: 10.1017/s000748532300024x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
Arthropod species diversity enhances ecosystem productivity and sustainability by increasing pollination and biological control services. Although, it is declining rapidly due to conventional agricultural intensification, organic agriculture with reduced reliance on agronomic inputs can regenerate ecosystems' resilience and restore them. Here, we report whether hexapod communities differ on both types of farming systems in small-scale field plot experiments, wherein Maize variety AG-589 was grown organically and conventionally in the 2020 and 2021 seasons. Livestock manure was applied in organic fields, whereas nitrogen and phosphorous were used as synthetic fertilizers in conventional fields. Hexapods were sampled three weeks after sowing once a week from the middle rows of subplots from both organically and conventionally grown maize. Twelve species of herbivores and four species of predators were recorded. Hexapod abundance overall and that of herbivores only was higher in conventionally cultivated maize, while predator abundance was higher in organic maize. Herbivores species diversity and evenness were significantly higher in conventional maize. Predator species diversity and evenness were significantly higher in organic maize fields. We noted predator abundance, diversity, and evenness as strong predictors to lower herbivore populations. These findings suggest that organic farming conserves natural enemies' biodiversity and regulates herbivores with increased provision of suitable habitats and prey resources for natural enemies, leading to enhanced relative abundance in their specialized niches. Thus, organic agriculture can potentially mediate better ecosystem services.
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Affiliation(s)
- Amir Hamza
- Department of Entomology, Faculty of Agricultural Sciences and Technology (FAS&T), Bahauddin Zakariya University, 66000 Multan, Pakistan
| | - Muhammad Omer Farooq
- Department of Entomology, Faculty of Agricultural Sciences and Technology (FAS&T), Bahauddin Zakariya University, 66000 Multan, Pakistan
| | - Muhammad Razaq
- Department of Entomology, Faculty of Agricultural Sciences and Technology (FAS&T), Bahauddin Zakariya University, 66000 Multan, Pakistan
| | - Farhan Mahmood Shah
- Department of Entomology, Faculty of Agricultural Sciences and Technology (FAS&T), Bahauddin Zakariya University, 66000 Multan, Pakistan
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11
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Lim YZ, Poh YH, Lee KC, Pointing SB, Wainwright BJ, Tan EJ. Influence of native and exotic plant diet on the gut microbiome of the Gray's Malayan stick insect, Lonchodes brevipes. Front Microbiol 2023; 14:1199187. [PMID: 37577436 PMCID: PMC10412900 DOI: 10.3389/fmicb.2023.1199187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 07/05/2023] [Indexed: 08/15/2023] Open
Abstract
Herbivorous insects require an active lignocellulolytic microbiome to process their diet. Stick insects (phasmids) are common in the tropics and display a cosmopolitan host plant feeding preference. The microbiomes of social insects are vertically transmitted to offspring, while for solitary species, such as phasmids, it has been assumed that microbiomes are acquired from their diet. This study reports the characterization of the gut microbiome for the Gray's Malayan stick insect, Lonchodes brevipes, reared on native and introduced species of host plants and compared to the microbiome of the host plant and surrounding soil to gain insight into possible sources of recruitment. Clear differences in the gut microbiome occurred between insects fed on native and exotic plant diets, and the native diet displayed a more species-rich fungal microbiome. While the findings suggest that phasmids may be capable of adapting their gut microbiome to changing diets, it is uncertain whether this may lead to any change in dietary efficiency or organismal fitness. Further insight in this regard may assist conservation and management decision-making.
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Affiliation(s)
- Yan Zhen Lim
- Division of Science, Yale-NUS College, Singapore, Singapore
| | - Yan Hong Poh
- Division of Science, Yale-NUS College, Singapore, Singapore
| | - Kevin C. Lee
- School of Science, Auckland University of Technology, Auckland, New Zealand
| | - Stephen Brian Pointing
- Division of Science, Yale-NUS College, Singapore, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Benjamin J. Wainwright
- Division of Science, Yale-NUS College, Singapore, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Eunice Jingmei Tan
- Division of Science, Yale-NUS College, Singapore, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
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12
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Scheuerell RP, LeRoy CJ. Plant sex influences on riparian communities and ecosystems. Ecol Evol 2023; 13:e10308. [PMID: 37449021 PMCID: PMC10337289 DOI: 10.1002/ece3.10308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 06/05/2023] [Accepted: 06/30/2023] [Indexed: 07/18/2023] Open
Abstract
Over the past several decades, we have increased our understanding of the influences of plant genetics on associated communities and ecosystem functions. These influences have been shown at both broad spatial scales and across many plant families, creating an active subdiscipline of ecology research focused on genes-to-ecosystems connections. One complex aspect of plant genetics is the distinction between males and females in dioecious plants. The genetic determinants of plant sex are poorly understood for most plants, but the influences of plant sex on morphological, physiological, and chemical plant traits are well-studied. We argue that these plant traits, controlled by plant sex, may have wide-reaching influences on both terrestrial and aquatic communities and ecosystem processes, particularly for riparian plants. Here we systematically review the influences of plant sex on plant traits, influences of plant traits on terrestrial community members, and how interactions between plant traits and terrestrial community members can influence terrestrial ecosystem functions in riparian forests. We then extend these influences into adjacent aquatic ecosystem functions and aquatic communities to explore how plant sex might influence linked terrestrial-aquatic systems as well as the physical structure of riparian systems. This review highlights data gaps in empirical studies exploring the direct influences of plant sex on communities and ecosystems but draws inference from community and ecosystem genetics. Overall, this review highlights how variation by plant sex has implications for climate change adaptations in riparian habitats, the evolution and range shifts of riparian species and the methods used for conserving and restoring riparian systems.
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Affiliation(s)
- River P. Scheuerell
- Environmental Studies ProgramThe Evergreen State CollegeOlympiaWashingtonUSA
| | - Carri J. LeRoy
- Environmental Studies ProgramThe Evergreen State CollegeOlympiaWashingtonUSA
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13
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Berthelot S, Bauhus J, Dormann CF, Gravel D, Messier C, Nock CA, Paquette A, Reich PB, Fründ J. Exotic tree species have consistently lower herbivore load in a cross-Atlantic tree biodiversity experiment. Ecology 2023:e4070. [PMID: 37127925 DOI: 10.1002/ecy.4070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 03/02/2023] [Accepted: 03/14/2023] [Indexed: 05/03/2023]
Abstract
It is commonly expected that exotic plants experience reduced herbivory, but experimental evidence for such enemy release is still controversial. One reason for conflicting results might be that community context has rarely been accounted for, although the surrounding plant diversity may moderate enemy release. Here, we tested the effects of focal tree origin and surrounding tree diversity on herbivore abundance and leaf damage in a cross-Atlantic tree diversity experiment in Canada and Germany. We evaluated six European tree species paired with six North American congeners in both their native and exotic range, expecting lower herbivory for the exotic tree species in each pair at each site. Such reciprocal experiments have long been called for, but have not been realized thus far. In addition to a thorough evaluation of overall enemy release effects, we tested whether enemy release effects change with the surrounding tree diversity. Herbivore abundance was indeed consistently lower on exotics across all six tree genera (12 comparisons). This effect of exotic status was independent of continent, phylogenetic relatedness and surrounding tree diversity. In contrast, leaf damage associated with generalist leaf chewers was consistently higher on North American tree species. Interestingly, several species of European weevils were the most abundant leaf chewers on both continents and the dominant herbivores at the Canadian site. Thus, most observed leaf damage likely reflects the effect of generalist herbivores that feed heavily on plant species they have not evolved with. At the German site, sap-suckers were the dominant herbivores and showed a pattern consistent with enemy release. Taken together, the consistently lower herbivory on exotics on both continents is not purely a pattern of enemy release in the strict sense, but to some degree additionally reflects the susceptibility of native plants to invasive herbivores. In conclusion, our cross-Atlantic study is consistent with the idea that non-native trees have generally reduced herbivory, regardless of tree community diversity and species identity, but for different reasons depending on the dominant herbivore guild.
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Affiliation(s)
- Sylvie Berthelot
- Albert-Ludwigs-Universität Freiburg, Biometry and Environmental System Analysis, Tennenbacher Straße 4, Freiburg, Germany
| | - Jürgen Bauhus
- Albert-Ludwigs-Universität Freiburg, Chair of Silviculture, Tennenbacher Straße 4, Freiburg, Germany
| | - Carsten F Dormann
- Albert-Ludwigs-Universität Freiburg, Biometry and Environmental System Analysis, Tennenbacher Straße 4, Freiburg, Germany
| | - Dominique Gravel
- Département de Biologie, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Christian Messier
- Département des Sciences Naturelles and Institut des Sciences de la Forêt Tempérée (ISFORT), Université du Québec en Outaouais (UQO), Ripon, QC, Canada
- Centre d'étude de la Forêt, Université du Québec à Montréal (UQAM), Montréal, QC, Canada
| | - Charles A Nock
- University of Alberta, Department of Renewable Resources, Earth and Atmospheric Sciences Building, Edmonton, AB, Canada
| | - Alain Paquette
- Centre d'étude de la Forêt, Université du Québec à Montréal (UQAM), Montréal, QC, Canada
| | - Peter B Reich
- Department of Forest Resources, University of Minnesota, St. Paul, MN, USA
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia
- Institute for Global Change Biology, University of Michigan, Ann Arbor, MI
| | - Jochen Fründ
- Albert-Ludwigs-Universität Freiburg, Biometry and Environmental System Analysis, Tennenbacher Straße 4, Freiburg, Germany
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14
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Li K, Grass I, Zemp DC, Lorenz H, Sachsenmaier L, Nurdiansyah F, Hölscher D, Kreft H, Tscharntke T. Tree identity and canopy openness mediate oil palm biodiversity enrichment effects on insect herbivory and pollination. Ecol Appl 2023:e2862. [PMID: 37096419 DOI: 10.1002/eap.2862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 03/28/2023] [Accepted: 04/07/2023] [Indexed: 05/03/2023]
Abstract
As the extent of oil palm (Elaeis guineensis) cultivation has expanded at the expense of tropical rainforests, enriching conventional large-scale oil palm plantations with native trees has been proposed as a strategy for restoring biodiversity and ecosystem function. However, how tree enrichment affects insect-mediated ecosystem functions is unknown. We investigated impacts on insect herbivory and pollination in the fourth year of a plantation-scale, long-term oil palm biodiversity enrichment experiment in Jambi, Sumatra, Indonesia. Within 48 plots systematically varying in size (25-1600 m2 ) and planted tree species richness (1-6 species), we collected response data on vegetation structure, understory insect abundances, and pollinator and herbivore activity on chili plants (Capsicum annuum), which served as indicators of insect-mediated ecosystem functions. We examined the independent effects of plot size, tree species richness, and tree identity on these response variables, using the linear model for random partitions design. The experimental treatments were most associated with vegetation structure: tree identity mattered, as the species Peronema canescens strongly decreased (by approximately one standard deviation) both canopy openness and understory vegetation cover; whereas tree richness only decreased understory flower density. Further, the smallest plots had the lowest understory flower density and richness, presumably because of lower light availability and colonization rates, respectively. Enrichment influenced herbivorous insects and natural enemies in the understory to a lesser extent: both groups had higher abundances in plots with two enrichment species planted, possibly because higher associated tree mortality created more habitat, while herbivores decreased with increasing tree species richness, in line with the resource concentration hypothesis. Linking relationships in structural equation models showed that the negative association between P. canescens and understory vegetation cover was mediated through canopy openness. Likewise, canopy openness mediated increases in herbivore and pollinator insect abundances. Higher pollinator visitation increased phytometer yield, while impacts of insect herbivores on yield were not apparent. Our results demonstrate that even at an early stage, different levels of ecological restoration influence insect-mediated ecosystem functions, mainly through canopy openness. These findings suggest that maintaining some canopy gaps while enrichment plots develop may be beneficial for increasing habitat heterogeneity and insect-mediated ecosystem functions.
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Affiliation(s)
- Kevin Li
- Agroecology, Department of Crop Sciences, University of Göttingen, Göttingen, Germany
| | - Ingo Grass
- Department of Ecology of Tropical Agricultural Systems, University of Hohenheim, Stuttgart, Germany
| | - Delphine Clara Zemp
- Biodiversity, Macroecology and Biogeography, University of Göttingen, Göttingen, Germany
| | - Hendrik Lorenz
- Tropical Silviculture and Forest Ecology, University of Göttingen, Göttingen, Germany
| | - Lena Sachsenmaier
- Biodiversity, Macroecology and Biogeography, University of Göttingen, Göttingen, Germany
| | | | - Dirk Hölscher
- Tropical Silviculture and Forest Ecology, University of Göttingen, Göttingen, Germany
- Centre of Biodiversity and Sustainable Land Use (CBL), University of Göttingen, Göttingen, Germany
| | - Holger Kreft
- Biodiversity, Macroecology and Biogeography, University of Göttingen, Göttingen, Germany
- Centre of Biodiversity and Sustainable Land Use (CBL), University of Göttingen, Göttingen, Germany
| | - Teja Tscharntke
- Agroecology, Department of Crop Sciences, University of Göttingen, Göttingen, Germany
- Centre of Biodiversity and Sustainable Land Use (CBL), University of Göttingen, Göttingen, Germany
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15
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Dawson SJ, Kreplins TL, Kennedy MS, Renwick J, Cowan MA, Fleming PA. Land use and dingo baiting are correlated with the density of kangaroos in rangeland systems. Integr Zool 2023; 18:299-315. [PMID: 36065141 DOI: 10.1111/1749-4877.12683] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Rangelands worldwide have been subject to broadscale modification, such as widespread predator control, introduction of permanent livestock water and altered vegetation to improve grazing. In Australia, these landscape changes have resulted in kangaroos (i.e. large macropods) populations increasing over the past 200 years. Kangaroos are a key contributor to total grazing pressure and in conjunction with livestock and feral herbivores have been linked to land degradation. We used 22 years of aerial survey data to investigate whether the density of 3 macropod species in the southern rangelands of Western Australia was associated with: (i) land use, including type of livestock, total livestock, density of feral goats, type of land tenure, and kangaroo commercial harvest effort; (ii) predator management, including permitted dingo control effort, estimated dingo abundance, and presence of the State Barrier Fence (a dingo exclusion fence); and (iii) environmental variables: ruggedness, rainfall, fractional cover, and total standing dry matter. Red kangaroos (Osphranter rufus) were most abundant in flat, open vegetation, on pastoral land, where area permitted for dingo control was high, and numbers were positively associated with antecedent rainfall with a 12-month delay. Western grey kangaroos (Macropus fuliginosus) were most abundant on flat, agricultural land, but less abundant in areas with high permitted dingo control. Euros (Osphranter robustus) were most abundant in rugged pastoral land with open vegetation, where permitted dingo control was high. While environmental variables are key drivers of landscape productivity and kangaroo populations, anthropogenic factors such as land use and permitted dingo control are strongly associated with kangaroo abundance.
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Affiliation(s)
- Stuart J Dawson
- Terrestrial Ecosystem Science and Sustainability, Harry Butler Institute, Murdoch University, Murdoch, Australia.,Department of Primary Industries and Regional Development (present address), South Perth, Australia
| | - Tracey L Kreplins
- Department of Primary Industries and Regional Development, Northam, Australia
| | | | - Juanita Renwick
- Queensland Department of Environment and Science, Moggill, Australia
| | - Mark A Cowan
- Department of Biodiversity, Conservation and Attractions, Woodvale, Australia
| | - Patricia A Fleming
- Terrestrial Ecosystem Science and Sustainability, Harry Butler Institute, Murdoch University, Murdoch, Australia
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16
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Recart W, Bernhard R, Ng I, Garcia K, Fleming-Davies AE. Meta-Analysis of the Effects of Insect Pathogens: Implications for Plant Reproduction. Pathogens 2023; 12:pathogens12020347. [PMID: 36839619 PMCID: PMC9958737 DOI: 10.3390/pathogens12020347] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 02/11/2023] [Accepted: 02/14/2023] [Indexed: 02/22/2023] Open
Abstract
Despite extensive work on both insect disease and plant reproduction, there is little research on the intersection of the two. Insect-infecting pathogens could disrupt the pollination process by affecting pollinator population density or traits. Pathogens may also infect insect herbivores and change herbivory, potentially altering resource allocation to plant reproduction. We conducted a meta-analysis to (1) summarize the literature on the effects of pathogens on insect pollinators and herbivores and (2) quantify the extent to which pathogens affect insect traits, with potential repercussions for plant reproduction. We found 39 articles that fit our criteria for inclusion, extracting 218 measures of insect traits for 21 different insect species exposed to 25 different pathogens. We detected a negative effect of pathogen exposure on insect traits, which varied by host function: pathogens had a significant negative effect on insects that were herbivores or carried multiple functions but not on insects that solely functioned as pollinators. Particular pathogen types were heavily studied in certain insect orders, with 7 of 11 viral pathogen studies conducted in Lepidoptera and 5 of 9 fungal pathogen studies conducted in Hymenoptera. Our results suggest that most studies have focused on a small set of host-pathogen pairs. To understand the implications for plant reproduction, future work is needed to directly measure the effects of pathogens on pollinator effectiveness.
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Affiliation(s)
- Wilnelia Recart
- Biology Department, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
- Correspondence:
| | - Rover Bernhard
- Biology Department, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
- Biology Department, Lewis and Clark College, 615 S. Palatine Hill Road, Portland, OR 97219, USA
| | - Isabella Ng
- Biology Department, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
| | - Katherine Garcia
- Biology Department, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
- Environmental Sciences Department, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0021, USA
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17
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Cianfaglione K, Crișan F, Gafta D. Soil Quality Enhances Seed Germination Success in Ephedra major-A Pilot Experiment. Plants (Basel) 2023; 12:438. [PMID: 36771523 PMCID: PMC9919005 DOI: 10.3390/plants12030438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/11/2023] [Accepted: 01/14/2023] [Indexed: 06/18/2023]
Abstract
There are currently knowledge gaps in the environmental context related to successful seed germination of Ephedra major. Therefore, we herein explore the influence of soil quality and water availability on the germination performance through a garden experiment that mimics natural site conditions. One hundred seeds were extracted from fifty ripe strobili collected randomly from the ramets of a single female plant. Ten seeds per pot were sown in ten pots, which were equally split by receiving different watering treatments (watered versus control) and soil types (S0-shallow and stony; S1-like S0 but slightly deeper; S2-like S0 but even deeper and rich in woodland humus; S3-clay-layered alluvial; S4-anthropogenic). No significant interaction effect was detected between the two manipulated factors. Watering only had a marginal effect on the germination rate, but the latter was significantly higher in S2 when compared to the other soil types. These outcomes suggest that soil quality is more important than moisture for the germination success. Its rate is expected to be higher under the open canopy of woodlands compared to open rupicolous habitats, since seeds can benefit from higher humus availability and reduced evapotranspiration.
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Affiliation(s)
- Kevin Cianfaglione
- Faculté de Gestion, Économie et Sciences (FGES), Université Catholique de Lille, F-59000 Lille, France
| | - Florin Crișan
- Department of Taxonomy and Ecology, 3B Centre, Babeș-Bolyai University, 42 Republic Street, 400015 Cluj-Napoca, Romania
| | - Dan Gafta
- Department of Taxonomy and Ecology, 3B Centre, Babeș-Bolyai University, 42 Republic Street, 400015 Cluj-Napoca, Romania
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18
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Li K, Veen GFC, Ten Hooven FC, Harvey JA, van der Putten WH. Soil legacy effects of plants and drought on aboveground insects in native and range-expanding plant communities. Ecol Lett 2023; 26:37-52. [PMID: 36414536 PMCID: PMC10098829 DOI: 10.1111/ele.14129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 07/20/2022] [Accepted: 09/14/2022] [Indexed: 11/24/2022]
Abstract
Soils contain biotic and abiotic legacies of previous conditions that may influence plant community biomass and associated aboveground biodiversity. However, little is known about the relative strengths and interactions of the various belowground legacies on aboveground plant-insect interactions. We used an outdoor mesocosm experiment to investigate the belowground legacy effects of range-expanding versus native plants, extreme drought and their interactions on plants, aphids and pollinators. We show that plant biomass was influenced more strongly by the previous plant community than by the previous summer drought. Plant communities consisted of four congeneric pairs of natives and range expanders, and their responses were not unanimous. Legacy effects affected the abundance of aphids more strongly than pollinators. We conclude that legacies can be contained as soil 'memories' that influence aboveground plant community interactions in the next growing season. These soil-borne 'memories' can be altered by climate warming-induced plant range shifts and extreme drought.
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Affiliation(s)
- Keli Li
- Department of Terrestrial Ecology (NIOO-KNAW), Netherlands Institute of Ecology, Wageningen, the Netherlands.,Laboratory of Nematology, Department of Plant Sciences, Wageningen University, Wageningen, the Netherlands
| | - G F Ciska Veen
- Department of Terrestrial Ecology (NIOO-KNAW), Netherlands Institute of Ecology, Wageningen, the Netherlands
| | - Freddy C Ten Hooven
- Department of Terrestrial Ecology (NIOO-KNAW), Netherlands Institute of Ecology, Wageningen, the Netherlands
| | - Jeffrey A Harvey
- Department of Terrestrial Ecology (NIOO-KNAW), Netherlands Institute of Ecology, Wageningen, the Netherlands.,Department of Ecological Science, Section Animal Ecology, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Wim H van der Putten
- Department of Terrestrial Ecology (NIOO-KNAW), Netherlands Institute of Ecology, Wageningen, the Netherlands.,Laboratory of Nematology, Department of Plant Sciences, Wageningen University, Wageningen, the Netherlands
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19
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Cornelissen JHC, Cornwell WK, Freschet GT, Weedon JT, Berg MP, Zanne AE. Coevolutionary legacies for plant decomposition. Trends Ecol Evol 2023; 38:44-54. [PMID: 35945074 DOI: 10.1016/j.tree.2022.07.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 12/24/2022]
Abstract
Coevolution has driven speciation and evolutionary novelty in functional traits across the Tree of Life. Classic coevolutionary syndromes such as plant-pollinator, plant-herbivore, and host-parasite have focused strongly on the fitness consequences during the lifetime of the interacting partners. Less is known about the consequences of coevolved traits for ecosystem-level processes, in particular their 'afterlife' legacies for litter decomposition, nutrient cycling, and the functional ecology of decomposers. We review the mechanisms by which traits resulting from coevolution between plants and their consumers, microbial symbionts, or humans, and between microbial decomposers and invertebrates, drive plant litter decomposition pathways and rates. This supports the idea that much of current global variation in the decomposition of plant material is a legacy of coevolution.
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Affiliation(s)
- J Hans C Cornelissen
- Amsterdam Institute for Life and Environment (A-LIFE), Systems Ecology Section, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081, HV, Amsterdam, The Netherlands.
| | - William K Cornwell
- Evolution and Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, University of New South Wales, Sydney, NSW, Australia
| | - Grégoire T Freschet
- Station d'Ecologie Théorique et Expérimentale, Centre National de la Recherche Scientifique (CNRS), Moulis, France
| | - James T Weedon
- Amsterdam Institute for Life and Environment (A-LIFE), Systems Ecology Section, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081, HV, Amsterdam, The Netherlands
| | - Matty P Berg
- A-LIFE, Ecology and Evolution Section, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands; Community and Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, The Netherlands
| | - Amy E Zanne
- Department of Biology, University of Miami, Miami, FL, USA
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20
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Zhou W, Xia X, Mendoza-Mendoza A, Wakil W, Akutse KS, Bing X. Editorial: Insect physiological changes during insect-plant interaction. Front Physiol 2023; 14:1175813. [PMID: 36969586 PMCID: PMC10031083 DOI: 10.3389/fphys.2023.1175813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 03/02/2023] [Indexed: 03/29/2023] Open
Affiliation(s)
- Wenwu Zhou
- State Key Laboratory of Rice Biology, Ministry of Agricultural and Rural Affairs Key Laboratory of Molecular Biology of Crop Pathogens and Insect Pests, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
- *Correspondence: Wenwu Zhou, ; Komivi Senyo Akutse, ; Xiaoli Bing,
| | - Xiaofeng Xia
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Artemio Mendoza-Mendoza
- Faculty of Agriculture and Life Sciences, Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln, New Zealand
| | - Waqas Wakil
- Department of Entomology, University of Agriculture, Faisalabad, Pakistan
- Senckenberg Deutsche Entomologische Institute (SDEI), Müncheberg, Germany
| | - Komivi Senyo Akutse
- International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya
- *Correspondence: Wenwu Zhou, ; Komivi Senyo Akutse, ; Xiaoli Bing,
| | - Xiaoli Bing
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
- *Correspondence: Wenwu Zhou, ; Komivi Senyo Akutse, ; Xiaoli Bing,
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21
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Yu Y, Shao C, Gong X, Quan H, Liu D, Chen Q, Chu Y. Antimicrobial Resistance Surveillance of Tigecycline-Resistant Strains Isolated from Herbivores in Northwest China. Microorganisms 2022; 10:microorganisms10122432. [PMID: 36557685 PMCID: PMC9784582 DOI: 10.3390/microorganisms10122432] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/25/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022] Open
Abstract
There is no doubt that antimicrobial resistance (AMR) is a global threat to public health and safety, regardless of whether it’s caused by people or natural transmission. This study aimed to investigate the genetic characteristics and variations of tigecycline-resistant Gram-negative isolates from herbivores in northwest China. In this study, a total of 300 samples were collected from various provinces in northwest China, and 11 strains (3.67%) of tigecycline-resistant bacteria were obtained. In addition, bacterial identification and antibiotic susceptibility testing against 14 antibiotics were performed. All isolates were multiple drug-resistant (MDR) and resistant to more than three kinds of antibiotics. Using an Illumina MiSeq platform, 11 tigecycline-resistant isolates were sequenced using whole genome sequencing (WGS). The assembled draft genomes were annotated, and then sequences were blasted against the AMR gene database and virulence factor database. Several resistance genes mediating drug resistance were detected by WGS, including fluoroquinolone resistance genes (gyrA_S83L, gyrA_D87N, S83L, parC_S80I, and gyrB_S463A), fosfomycin resistance genes (GlpT_E448K and UhpT_E350Q), beta-lactam resistance genes (FtsI_D350N and S357N), and the tigecycline resistance gene (tetR N/A). Furthermore, there were five kinds of chromosomally encoded genetic systems that confer MDR (MarR_Y137H, G103S, MarR_N/A, SoxR_N/A, SoxS_N/A, AcrR N/A, and MexZ_K127E). A comprehensive analysis of MDR strains derived from WGS was used to detect variable antimicrobial resistance genes and their precise mechanisms of resistance. In addition, we found a novel ST type of Escherichia coli (ST13667) and a newly discovered point mutation (K127E) in the MexZ gene of Pseudomonas aeruginosa. WGS plays a crucial role in AMR control, prevention strategies, as well as multifaceted intervention strategies.
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Affiliation(s)
- Yongfeng Yu
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
| | - Changchun Shao
- Lanzhou Institute for Food and Drug Control, Lanzhou 730050, China
| | - Xiaowei Gong
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
| | - Heng Quan
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
| | - Donghui Liu
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
| | - Qiwei Chen
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
- Correspondence: (Q.C.); (Y.C.)
| | - Yuefeng Chu
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
- Correspondence: (Q.C.); (Y.C.)
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22
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Selås V, Kobro S. The lunar nodal phase cycle and winter atmospheric pressure as possible determinants of moth abundance: Analyses of a 30-year time series from South Norway. Ecol Evol 2022; 12:e9443. [PMID: 36311391 PMCID: PMC9608810 DOI: 10.1002/ece3.9443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 09/30/2022] [Accepted: 10/04/2022] [Indexed: 11/25/2022] Open
Abstract
According to the plant stress hypothesis, population peaks of herbivores such as moths are caused by plant stress factors that force plants to reallocate stored defensive proteins to transportable and easily digestive N‐compounds. A suggested plant stress factor is ionization caused by cosmic ray muons, which are modulated by the 9.3‐year lunar nodal phase cycle, solar activity, and atmospheric pressure. Vascular plants are more sensitive to ionization than are bryophytes, and woody plants are more sensitive than are herbaceous plants, but the difference may be less during dormancy in winter. We selected the 14 most common moth species from a 30‐year light‐trapping study in southern Norway to test whether the fluctuation patterns of species from three different feeding guilds were correlated with lunar/solar cycles, or with atmospheric pressure in winter, when muon fluxes are higher than in other seasons. The population indices of three species feeding on deciduous woody plants were positively correlated with the lunar nodal phase index, and there was a similar tendency for the remaining three species. No positive correlations with the lunar index were found for species feeding on herbs or mosses. For nine species, that is, from all three guilds, there was a significant negative correlation between the population index and winter atmospheric pressure in the previous year. The results are in accordance with predictions deduced from the cosmic ray hypothesis, but thorough investigations of the proposed physiological mechanisms are needed for the hypothesis to be widely accepted.
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Affiliation(s)
- Vidar Selås
- Department of Ecology and Natural Resource ManagementNorwegian University of Life SciencesÅsNorway
| | - Sverre Kobro
- Norwegian Institute of Bioeconomy ResearchÅsNorway
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23
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Sanchez-Mahecha O, Klink S, Heinen R, Rothballer M, Zytynska S. Impaired microbial N-acyl homoserine lactone signalling increases plant resistance to aphids across variable abiotic and biotic environments. Plant Cell Environ 2022; 45:3052-3069. [PMID: 35852014 DOI: 10.1111/pce.14399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
Beneficial bacteria interact with plants using signalling molecules, such as N-acyl homoserine-lactones (AHLs). Although there is evidence that these molecules affect plant responses to pathogens, few studies have examined their effect on plant-insect and microbiome interactions, especially under variable soil conditions. We investigated the effect of the AHL-producing rhizobacterium Acidovorax radicis and its AHL-negative mutant (does not produce AHLs) on modulating barley (Hordeum vulgare) plant interactions with cereal aphids (Sitobion avenae) and earthworms (Dendrobaena veneta) across variable nutrient soils. Acidovorax radicis inoculation increased plant growth and suppressed aphids, with stronger effects by the AHL-negative mutant. However, effects varied between barley cultivars and the presence of earthworms altered interaction outcomes. Bacteria-induced plant defences differed between cultivars, and aphid exposure, with pathogenesis-related and WRKY pathways partly explaining the ecological effects in the more resistant cultivars. Additionally, we observed few but specific indirect effects via the wider root microbiome where the AHL-mutant strain influenced rare OTU abundances. We conclude that bacterial AHL-signalling disruption affects plant-microbial interactions by inducing different plant pathways, leading to increased insect resistance, also mediated by the surrounding biotic and abiotic environment. Understanding the mechanisms by which beneficial bacteria can reduce insect pests is a key research area for developing effective insect pest management strategies in sustainable agriculture.
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Affiliation(s)
- Oriana Sanchez-Mahecha
- Department of Ecology and Ecosystem Management, Technical University of Munich, Terrestrial Ecology Research Group, School of Life Sciences Weihenstephan, Freising, Germany
| | - Sophia Klink
- Helmholtz Center Munich, German Research Center for Environmental Health (GmbH), Institute of Network Biology, Neuherberg, Germany
| | - Robin Heinen
- Department of Ecology and Ecosystem Management, Technical University of Munich, Terrestrial Ecology Research Group, School of Life Sciences Weihenstephan, Freising, Germany
| | - Michael Rothballer
- Helmholtz Center Munich, German Research Center for Environmental Health (GmbH), Institute of Network Biology, Neuherberg, Germany
| | - Sharon Zytynska
- Department of Ecology and Ecosystem Management, Technical University of Munich, Terrestrial Ecology Research Group, School of Life Sciences Weihenstephan, Freising, Germany
- Department of Evolution, Ecology, and Behaviour, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK
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24
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Batyrshina ZS, Shavit R, Yaakov B, Bocobza S, Tzin V. The transcription factor TaMYB31 regulates the benzoxazinoid biosynthetic pathway in wheat. J Exp Bot 2022; 73:5634-5649. [PMID: 35554544 PMCID: PMC9467655 DOI: 10.1093/jxb/erac204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 05/10/2022] [Indexed: 05/13/2023]
Abstract
Benzoxazinoids are specialized metabolites that are highly abundant in staple crops, such as maize and wheat. Although their biosynthesis has been studied for several decades, the regulatory mechanisms of the benzoxazinoid pathway remain unknown. Here, we report that the wheat transcription factor MYB31 functions as a regulator of benzoxazinoid biosynthesis genes. A transcriptomic analysis of tetraploid wheat (Triticum turgidum) tissue revealed the up-regulation of two TtMYB31 homoeologous genes upon aphid and caterpillar feeding. TaMYB31 gene silencing in the hexaploid wheat Triticum aestivum significantly reduced benzoxazinoid metabolite levels and led to susceptibility to herbivores. Thus, aphid progeny production, caterpillar body weight gain, and spider mite oviposition significantly increased in TaMYB31-silenced plants. A comprehensive transcriptomic analysis of hexaploid wheat revealed that the TaMYB31 gene is co-expressed with the target benzoxazinoid-encoded Bx genes under several biotic and environmental conditions. Therefore, we analyzed the effect of abiotic stresses on benzoxazinoid levels and discovered a strong accumulation of these compounds in the leaves. The results of a dual fluorescence assay indicated that TaMYB31 binds to the Bx1 and Bx4 gene promoters, thereby activating the transcription of genes involved in the benzoxazinoid pathway. Our finding is the first report of the transcriptional regulation mechanism of the benzoxazinoid pathway in wheat.
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Affiliation(s)
- Zhaniya S Batyrshina
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben Gurion, 8499000, Israel
| | - Reut Shavit
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben Gurion, 8499000, Israel
| | - Beery Yaakov
- French Associates Institute for Agriculture and Biotechnology of Drylands, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben Gurion, 8499000, Israel
| | - Samuel Bocobza
- Department of Ornamentals and Biotechnology, Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, 68 Hamakabim Road, 7528809, Rishon LeZion, Israel
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25
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Hanafy RA, Dagar SS, Griffith GW, Pratt CJ, Youssef NH, Elshahed MS. Taxonomy of the anaerobic gut fungi ( Neocallimastigomycota): a review of classification criteria and description of current taxa. Int J Syst Evol Microbiol 2022; 72. [PMID: 35776761 DOI: 10.1099/ijsem.0.005322] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Members of the anaerobic gut fungi (Neocallimastigomycota) reside in the rumen and alimentary tract of larger mammalian and some reptilian, marsupial and avian herbivores. The recent decade has witnessed a significant expansion in the number of described Neocallimastigomycota genera and species. However, the difficulties associated with the isolation and maintenance of Neocallimastigomycota strains has greatly complicated comparative studies to resolve inter- and intra-genus relationships. Here, we provide an updated outline of Neocallimastigomycota taxonomy. We critically evaluate various morphological, microscopic and phylogenetic traits previously and currently utilized in Neocallimastigomycota taxonomy, and provide an updated key for quick characterization of all genera. We then synthesize data from taxa description manuscripts, prior comparative efforts and molecular sequence data to present an updated list of Neocallimastigomycota genera and species, with an emphasis on resolving relationships and identifying synonymy between recent and historic strains. We supplement data from published manuscripts with information and illustrations from strains in the authors' collections. Twenty genera and 36 species are recognized, but the status of 10 species in the genera Caecomyces, Piromyces, Anaeromyces and Cyllamyces remains uncertain due to the unavailability of culture and conferre (cf.) strains, lack of sequence data, and/or inadequacy of available microscopic and phenotypic data. Six cases of synonymy are identified in the genera Neocallimastix and Caecomyces, and two names in the genus Piromyces are rejected based on apparent misclassification.
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Affiliation(s)
- Radwa A Hanafy
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, USA
| | - Sumit S Dagar
- Bioenergy Group, Agharkar Research Institute, Pune, India
| | - Gareth W Griffith
- Institute of Biological, Environmental, and Rural Sciences (IBERS) Aberystwyth University, Aberystwyth, Wales, UK
| | - Carrie J Pratt
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, USA
| | - Noha H Youssef
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, USA
| | - Mostafa S Elshahed
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK, USA
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26
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König S, Krauss J, Keller A, Bofinger L, Steffan-Dewenter I. Phylogenetic relatedness of food plants reveals highest insect herbivore specialization at intermediate temperatures along a broad climatic gradient. Glob Chang Biol 2022; 28:4027-4040. [PMID: 35429201 DOI: 10.1111/gcb.16199] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 03/25/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
The composition and richness of herbivore and plant assemblages change along climatic gradients, but knowledge about associated shifts in specialization is scarce and lacks controlling for the abundance and phylogeny of interaction partners. Thus, we aimed to test whether the specialization of phytophagous insects in insect-plant interaction networks decreases toward cold habitats as predicted by the 'altitude niche-breadth hypothesis' to forecast possible consequences of interaction rewiring under climate change. We used a non-invasive, standardized metabarcoding approach to reconstruct dietary relationships of Orthoptera species as a major insect herbivore taxon along a broad temperature gradient (~12°C) in Southern Germany. Based on Orthoptera surveys, feeding observations, collection of fecal pellets from >3,000 individuals of 54 species, and parallel vegetation surveys on 41 grassland sites, we quantified plant resource availability and its use by herbivores. Herbivore assemblages were richer in species and individuals at sites with high summer temperatures, while plant richness peaked at intermediate temperatures. Corresponding interaction networks were most specialized in warm habitats. Considering phylogenetic relationships of plant resources, however, the specialization pattern was not linear but peaked at intermediate temperatures, mediated by herbivores feeding on a narrow range of phylogenetically related resources. Our study provides empirical evidence of resource specialization of insect herbivores along a climatic gradient, demonstrating that resource phylogeny, availability, and temperature interactively shape the specialization of herbivore assemblages. Instead of low specialization levels only in cold, harsh habitats, our results suggest increased generalist feeding due to intraspecific changes and compositional differences at both ends of the microclimatic gradient. We conclude that this nonlinear change of phylogeny-based resource specialization questions predictions derived from the 'altitude-niche breadth hypothesis' and highlights the currently limited understanding of how plant-herbivore interactions will change under future climatic conditions.
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Affiliation(s)
- Sebastian König
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, Würzburg, Germany
| | - Jochen Krauss
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, Würzburg, Germany
| | - Alexander Keller
- Organismic and Cellular Interactions, Biocenter, Ludwig-Maximilians-Universität München, Planegg, Germany
| | | | - Ingolf Steffan-Dewenter
- Department of Animal Ecology and Tropical Biology, Biocenter, University of Würzburg, Würzburg, Germany
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27
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Bakhteeva I, Timofeev V. Some Peculiarities of Anthrax Epidemiology in Herbivorous and Carnivorous Animals. Life (Basel) 2022; 12:life12060870. [PMID: 35743901 PMCID: PMC9224990 DOI: 10.3390/life12060870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/06/2022] [Accepted: 06/08/2022] [Indexed: 11/28/2022]
Abstract
Anthrax is an especially dangerous zooanthroponosis caused by the Gram-positive spore-forming bacterium Bacillus anthracis. A notable feature of this disease is the difference in susceptibility to it among different groups of animals. Anthrax primarily affects herbivorous ungulate mammals; they are easily infected, and their disease often leads to rapid, even sudden, death. However, predators and scavengers are extremely resistant to anthrax, and if they become infected, they usually become mildly ill. As the result of the increased sensitivity of ungulates to anthrax and the possibility of disease transmission from them to humans, most studies of anthrax have focused on the diagnosis, prevention, and treatment of infection in farm animals and humans. The issues of anthrax in other animals, such as predators, and the peculiarities of anthrax epidemiology in wild ungulates have not been sufficiently detailed in the literature. In this article, we provide a review of literature sources that describe the differential susceptibility to infection of various groups of animals to anthrax and some epidemiological features of anthrax in animals that are not the main hosts of B. anthracis.
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28
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Fragata I, Costa-Pereira R, Kozak M, Majer A, Godoy O, Magalhães S. Specific sequence of arrival promotes coexistence via spatial niche pre-emption by the weak competitor. Ecol Lett 2022; 25:1629-1639. [PMID: 35596732 DOI: 10.1111/ele.14021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/17/2022] [Accepted: 03/29/2022] [Indexed: 11/26/2022]
Abstract
Historical contingency, such as the order of species arrival, can modify competitive outcomes via niche modification or pre-emption. However, how these mechanisms ultimately modify stabilising niche and average fitness differences remains largely unknown. By experimentally assembling two congeneric spider mite species feeding on tomato plants during two generations, we show that order of arrival affects species' competitive ability and changes the outcome of competition. Contrary to expectations, order of arrival did not cause positive frequency dependent priority effects. Instead, coexistence was predicted when the inferior competitor (Tetranychus urticae) arrived first. In that case, T. urticae colonised the preferred feeding stratum (leaves) of T. evansi leading to spatial niche pre-emption, which equalised fitness and reduced niche differences, driving community assembly to a close-to-neutrality scenario. Our study demonstrates how the order of species arrival and the spatial context of competitive interactions may jointly determine whether species can coexist.
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Affiliation(s)
- Inês Fragata
- Centre for Ecology, Evolution and Environmental Changes, Department of Animal Biology, Faculty of Sciences University of Lisbon, Lisbon, Portugal
| | - Raul Costa-Pereira
- Department of Animal Biology, Institute of Biology, Universidade Estadual de Campinas, Campinas, Brazil
| | - Mariya Kozak
- Centre for Ecology, Evolution and Environmental Changes, Department of Animal Biology, Faculty of Sciences University of Lisbon, Lisbon, Portugal
| | - Agnieszka Majer
- Population Ecology Lab, Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
| | - Oscar Godoy
- Department of Biology, Instituto Universitario de Investigación Marina (INMAR), Universidad de Cádiz, Puerto Real, Spain
| | - Sara Magalhães
- Centre for Ecology, Evolution and Environmental Changes, Department of Animal Biology, Faculty of Sciences University of Lisbon, Lisbon, Portugal
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29
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Nieberding CM, Marcantonio M, Voda R, Enriquez T, Visser B. The Evolutionary Relevance of Social Learning and Transmission in Non-Social Arthropods with a Focus on Oviposition-Related Behaviors. Genes (Basel) 2021; 12:genes12101466. [PMID: 34680861 PMCID: PMC8536077 DOI: 10.3390/genes12101466] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 09/15/2021] [Accepted: 09/21/2021] [Indexed: 12/04/2022] Open
Abstract
Research on social learning has centered around vertebrates, but evidence is accumulating that small-brained, non-social arthropods also learn from others. Social learning can lead to social inheritance when socially acquired behaviors are transmitted to subsequent generations. Using oviposition site selection, a critical behavior for most arthropods, as an example, we first highlight the complementarities between social and classical genetic inheritance. We then discuss the relevance of studying social learning and transmission in non-social arthropods and document known cases in the literature, including examples of social learning from con- and hetero-specifics. We further highlight under which conditions social learning can be adaptive or not. We conclude that non-social arthropods and the study of oviposition behavior offer unparalleled opportunities to unravel the importance of social learning and inheritance for animal evolution.
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Affiliation(s)
- Caroline M. Nieberding
- Evolutionary Ecology and Genetics Group, Earth and Life Institute, UCLouvain, 1348 Louvain-la-Neuve, Belgium; (M.M.); (R.V.)
- Correspondence:
| | - Matteo Marcantonio
- Evolutionary Ecology and Genetics Group, Earth and Life Institute, UCLouvain, 1348 Louvain-la-Neuve, Belgium; (M.M.); (R.V.)
| | - Raluca Voda
- Evolutionary Ecology and Genetics Group, Earth and Life Institute, UCLouvain, 1348 Louvain-la-Neuve, Belgium; (M.M.); (R.V.)
| | - Thomas Enriquez
- Evolution and Ecophysiology Group, Earth and Life Institute, UCLouvain, 1348 Louvain-la-Neuve, Belgium; (T.E.); (B.V.)
| | - Bertanne Visser
- Evolution and Ecophysiology Group, Earth and Life Institute, UCLouvain, 1348 Louvain-la-Neuve, Belgium; (T.E.); (B.V.)
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30
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Thöming G. Behavior Matters-Future Need for Insect Studies on Odor-Mediated Host Plant Recognition with the Aim of Making Use of Allelochemicals for Plant Protection. J Agric Food Chem 2021; 69:10469-10479. [PMID: 34482687 DOI: 10.1021/acs.jafc.1c03593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Allelochemicals, chemical cues that, among other things, mediate insect-plant interactions, such as host plant recognition, have attracted notable interest as tools for ecological control of pest insects. Advances have recently been made in methods for sampling and analyzing volatile compounds and technology for tracking insects in their natural habitat. However, progress in odor-mediated behavioral bioassays of insects has been relatively slow. This perspective highlights this odor-mediated insect behavior, particularly in a natural setting and considering the whole behavioral sequence involved in the host location, which is the key to understanding the mechanisms underlying host plant recognition. There is thus a need to focus on elaborate behavioral bioassays in future studies, particularly if the goal is to use allelochemicals in pest control. Future directions for research are discussed.
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Affiliation(s)
- Gunda Thöming
- Division of Biotechnology and Plant Health, Norwegian Institute of Bioeconomy Research, Høgskoleveien 7, NO-1433 Ås, Norway
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31
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Ninkovic V, Glinwood R, Ünlü AG, Ganji S, Unelius CR. Effects of Methyl Salicylate on Host Plant Acceptance and Feeding by the Aphid Rhopalosiphum padi. Front Plant Sci 2021; 12:710268. [PMID: 34484270 PMCID: PMC8415113 DOI: 10.3389/fpls.2021.710268] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Accepted: 07/14/2021] [Indexed: 05/27/2023]
Abstract
Methyl salicylate (MeSA) is a volatile shown to act as an inducer of plant defense against pathogens and certain herbivores, particularly aphids. It has been shown to have potential for aphid pest management, but knowledge on its mode of action is lacking, particularly induced plant-mediated effects. This study investigated the effects of exposing plants to MeSA on the host searching, host acceptance and feeding behavior of the bird cherry-oat aphid Rhopalosiphum padi. Barley plants were exposed to volatile MeSA for 24 h, after which biological effects were tested immediately after the exposure (Day 0), and then 1, 3 and 5 days after the end of the exposure. Aphid settling on MeSA-exposed plants was significantly reduced on days 0, 1 and 3, but not on day 5. In olfactometer tests, aphids preferred the odor of unexposed plants on days 1 and 3, but not on day 0 or 5. Analysis of volatiles from exposed and unexposed plants showed higher levels of MeSA from exposed plants, most likely absorbed and re-released from plant surfaces, but also specific changes in other plant volatiles on days 0, 1 and 3. High doses of MeSA did not affect aphid orientation in an olfactometer, but lower doses were repellent. Analysis of aphid feeding by Electronic penetration graph (EPG) showed that MeSA exposure resulted in resistance factors in barley plants, including surface factors and induced systemic factors in other tissues including the phloem. The results support the potential of MeSA as a potential tool for management of aphid pests.
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Affiliation(s)
- Velemir Ninkovic
- Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Robert Glinwood
- Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Ayse Gül Ünlü
- Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Suresh Ganji
- Department of Chemistry and Biomedical Sciences, Linnaeus University, Kalmar, Sweden
| | - C. Rikard Unelius
- Department of Chemistry and Biomedical Sciences, Linnaeus University, Kalmar, Sweden
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32
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Wilfahrt PA, Asmus AL, Seabloom EW, Henning JA, Adler P, Arnillas CA, Bakker JD, Biederman L, Brudvig LA, Cadotte M, Daleo P, Eskelinen A, Firn J, Harpole WS, Hautier Y, Kirkman KP, Komatsu KJ, Laungani R, MacDougall A, McCulley RL, Moore JL, Morgan JW, Mortensen B, Ochoa Hueso R, Ohlert T, Power SA, Price J, Risch AC, Schuetz M, Shoemaker L, Stevens C, Strauss AT, Tognetti PM, Virtanen R, Borer ET. Temporal rarity is a better predictor of local extinction risk than spatial rarity. Ecology 2021; 102:e03504. [PMID: 34319599 DOI: 10.1002/ecy.3504] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 05/04/2021] [Accepted: 06/03/2021] [Indexed: 11/09/2022]
Abstract
Spatial rarity is often used to predict extinction risk, but rarity can also occur temporally. Perhaps more relevant in the context of global change is whether a species is core to a community (persistent) or transient (intermittently present), with transient species often susceptible to human activities that reduce niche space. Using 5-12 yr of data on 1,447 plant species from 49 grasslands on five continents, we show that local abundance and species persistence under ambient conditions are both effective predictors of local extinction risk following experimental exclusion of grazers or addition of nutrients; persistence was a more powerful predictor than local abundance. While perturbations increased the risk of exclusion for low persistence and abundance species, transient but abundant species were also highly likely to be excluded from a perturbed plot relative to ambient conditions. Moreover, low persistence and low abundance species that were not excluded from perturbed plots tended to have a modest increase in abundance following perturbance. Last, even core species with high abundances had large decreases in persistence and increased losses in perturbed plots, threatening the long-term stability of these grasslands. Our results demonstrate that expanding the concept of rarity to include temporal dynamics, in addition to local abundance, more effectively predicts extinction risk in response to environmental change than either rarity axis predicts alone.
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Affiliation(s)
- Peter A Wilfahrt
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Ashley L Asmus
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Eric W Seabloom
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Jeremiah A Henning
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA.,Department of Biology, University of South Alabama, Mobile, Alabama, 36688, USA
| | - Peter Adler
- Department of Wildland Resources and the Ecology Center, Utah State University, Logan, Utah, 84322, USA
| | - Carlos A Arnillas
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, Ontario, M1C 1A4, Canada
| | - Jonathan D Bakker
- School of Environmental and Forest Sciences, University of Washington, Seattle, Washington, 98195, USA
| | - Lori Biederman
- Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, Iowa, 50011, USA
| | - Lars A Brudvig
- Department of Plant Biology and Program in Ecology, Evolutionary Biology and Behavior, Michigan State University, East Lansing, Michigan, 48824, USA
| | - Marc Cadotte
- Department of Biological Sciences, University of Toronto Scarborough, Toronto, Ontario, M1C 1A4, Canada
| | - Pedro Daleo
- Instituto de Investigaciones Marinas y Costeras (IIMyC), CONICET - UNMDP, Mar del Plata, Argentina
| | - Anu Eskelinen
- Department of Biology, German Centre for Integrative Biodiversity Research (iDiv), Leipzig, 04103, Germany
| | - Jennifer Firn
- School of Biology & Environmental Science, Queensland University of Technology, Brisbane, Queensland, 4000, Australia
| | - W Stanley Harpole
- Department of Biology, German Centre for Integrative Biodiversity Research (iDiv), Leipzig, 04103, Germany.,Department of Physiological Diversity, Helmholtz Center for Environmental Research - UFZ, Permoserstrasse 15, Leipzig, 04318, Germany.,Martin Luther University Halle-Wittenberg, am Kirchtor 1, Halle (Saale), 06108, Germany
| | - Yann Hautier
- Ecology and Biodiversity Group, Department of Biology, Utrecht University, Utrecht, 3584, The Netherlands
| | - Kevin P Kirkman
- School of Life Sciences, University of KwaZulu-Natal, Scottsville, 3209, South Africa
| | - Kimberly J Komatsu
- Smithsonian Environmental Research Center, Edgewater, Maryland, 21037, USA
| | - Ramesh Laungani
- Department of Biology, Doane University, Crete, Nebraska, 68333, USA
| | - Andrew MacDougall
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Rebecca L McCulley
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, Kentucky, 40546, USA
| | - Joslin L Moore
- School of Biological Sciences, Monash University, Clayton, Victoria, 3800, Australia
| | - John W Morgan
- Department of Ecology, Environment & Evolution, La Trobe University, Bundoora, Victoria, 3086, Australia
| | - Brent Mortensen
- Department of Biology, Benedictine College, Atchison, Kansas, 66002, USA
| | | | - Timothy Ohlert
- Department of Biology, University of New Mexico, Albuquerque, New Mexico, 87131, USA
| | - Sally A Power
- Hawkesbury Institute for the Environment, University of Western Sydney, Penrith, New South Wales, 2751, Australia
| | - Jodi Price
- Institute of Land, Water and Society, Charles Sturt University, Albury, New South Wales, 2678, Australia
| | - Anita C Risch
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, 8903, Switzerland
| | - Martin Schuetz
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, 8903, Switzerland
| | - Lauren Shoemaker
- Botany Department, University of Wyoming, Laramie, Wyoming, 82071, USA
| | - Carly Stevens
- Lancaster Environment Center, Lancaster University, Lancaster, LA1 4YQ, UK
| | - Alexander T Strauss
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA.,Odum School of Ecology, University of Georgia, Athens, Georgia, 30602, USA
| | - Pedro M Tognetti
- IFEVA, Facultad de Agronomía, Universidad de Buenos Aires, CONICET, Buenos Aires, Argentina
| | - Risto Virtanen
- Department of Biology, University of Oulu, Oulu, 90570, Finland
| | - Elizabeth T Borer
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
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Seabloom EW, Batzer E, Chase JM, Stanley Harpole W, Adler PB, Bagchi S, Bakker JD, Barrio IC, Biederman L, Boughton EH, Bugalho MN, Caldeira MC, Catford JA, Daleo P, Eisenhauer N, Eskelinen A, Haider S, Hallett LM, Svala Jónsdóttir I, Kimmel K, Kuhlman M, MacDougall A, Molina CD, Moore JL, Morgan JW, Muthukrishnan R, Ohlert T, Risch AC, Roscher C, Schütz M, Sonnier G, Tognetti PM, Virtanen R, Wilfahrt PA, Borer ET. Species loss due to nutrient addition increases with spatial scale in global grasslands. Ecol Lett 2021; 24:2100-2112. [PMID: 34240557 DOI: 10.1111/ele.13838] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 12/30/2020] [Accepted: 05/19/2021] [Indexed: 11/30/2022]
Abstract
The effects of altered nutrient supplies and herbivore density on species diversity vary with spatial scale, because coexistence mechanisms are scale dependent. This scale dependence may alter the shape of the species-area relationship (SAR), which can be described by changes in species richness (S) as a power function of the sample area (A): S = cAz , where c and z are constants. We analysed the effects of experimental manipulations of nutrient supply and herbivore density on species richness across a range of scales (0.01-75 m2 ) at 30 grasslands in 10 countries. We found that nutrient addition reduced the number of species that could co-occur locally, indicated by the SAR intercepts (log c), but did not affect the SAR slopes (z). As a result, proportional species loss due to nutrient enrichment was largely unchanged across sampling scales, whereas total species loss increased over threefold across our range of sampling scales.
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Affiliation(s)
- Eric W Seabloom
- Department of Ecology, Evolution, and Behavior, University of Minnesota. St. Paul, MN, USA
| | - Evan Batzer
- Department of Plant Sciences, University of California, Davis, CA, USA
| | - Jonathan M Chase
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Department of Computer Sciences, Martin Luther University, Halle (Saale), Germany
| | - W Stanley Harpole
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Department of Physiological Diversity, Helmholtz Center for Environmental Research - UFZ, Leipzig, Germany.,Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Peter B Adler
- Department of Wildland Resources and the Ecology Center, Utah State University, Logan, UT, USA
| | - Sumanta Bagchi
- Centre for Ecological Sciences, Indian Institute of Science, Bangalore, India
| | - Jonathan D Bakker
- School of Environmental and Forest Sciences, University of Washington, Seattle, WA, USA
| | - Isabel C Barrio
- Faculty of Environmental and Forest Sciences, Agricultural University of Iceland, Reykjavík, Iceland
| | - Lori Biederman
- Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames Iowa, USA
| | | | - Miguel N Bugalho
- Centre for Applied Ecology "Prof. Baeta Neves" (CEABN-InBIO), School of Agriculture, University of Lisbon, Lisbon, Portugal
| | - Maria C Caldeira
- Forest Research Centre, School of Agriculture, University of Lisbon, Lisbon, Portugal
| | - Jane A Catford
- Department of Geography, King's College London, London, UK
| | - Pedro Daleo
- Instituto de Investigaciones Marinas y Costeras (IIMyC), UNMDP - CONICET, Mar del Plata, Argentina
| | - Nico Eisenhauer
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Institute of Biology, Leipzig University, Leipzig, Germany
| | - Anu Eskelinen
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Department of Physiological Diversity, Helmholtz Center for Environmental Research - UFZ, Leipzig, Germany.,Department of Ecology and Genetics, University of Oulu, Oulu, Finland
| | - Sylvia Haider
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Institute of Biology / Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Lauren M Hallett
- Department of Biology and Environmental Studies Program, University of Oregon, Eugene, Oregon, USA
| | | | - Kaitlin Kimmel
- Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, USA
| | | | | | - Cecilia D Molina
- IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Buenos Aires, Argentina, Buenos Aires, Argentina
| | - Joslin L Moore
- School of Biological Sciences, Monash University, Clayton, VIC, Australia
| | - John W Morgan
- Department of Ecology, Environment & Evolution, La Trobe University, Bundoora, VIC, Australia
| | | | - Timothy Ohlert
- Department of Biology, University of New Mexico, Albuquerque, NM, USA
| | - Anita C Risch
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Community Ecology, Birmensdorf, Switzerland
| | - Christiane Roscher
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Department of Physiological Diversity, Helmholtz Center for Environmental Research - UFZ, Leipzig, Germany
| | - Martin Schütz
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Community Ecology, Birmensdorf, Switzerland
| | | | - Pedro M Tognetti
- IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Buenos Aires, Argentina, Buenos Aires, Argentina
| | - Risto Virtanen
- Department of Ecology and Genetics, University of Oulu, Oulu, Finland
| | - Peter A Wilfahrt
- Department of Ecology, Evolution, and Behavior, University of Minnesota. St. Paul, MN, USA
| | - Elizabeth T Borer
- Department of Ecology, Evolution, and Behavior, University of Minnesota. St. Paul, MN, USA
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Hanafy RA, Youssef NH, Elshahed MS. Paucimyces polynucleatus gen. nov, sp. nov., a novel polycentric genus of anaerobic gut fungi from the faeces of a wild blackbuck antelope. Int J Syst Evol Microbiol 2021; 71. [PMID: 34161217 DOI: 10.1099/ijsem.0.004832] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The anaerobic gut fungi (AGF; phylum Neocallimastigomycota) reside in the alimentary tracts of herbivores. Multiple novel, yet-uncultured AGF taxa have recently been identified in culture-independent diversity surveys. Here, we report on the isolation and characterization of the first representative of the RH5 lineage from faecal samples of a wild blackbuck (Indian Antelope, Antilope cervicapra) from Sutton County, Texas, USA. The isolates displayed medium sized (2-4 mm) compact circular colonies on agar roll tubes and thin loose biofilm-like growth in liquid medium. Microscopic examination revealed monoflagellated zoospores and polycentric thalli with highly branched nucleated filamentous rhizomycelium, a growth pattern encountered in a minority of described AGF genera so far. The obtained isolates are characterized by formation of spherical vesicles at the hyphal tips from which multiple sporangia formed either directly on the spherical vesicles or at the end of sporangiophores. Phylogenetic analysis using the D1/D2 regions of the large ribosomal subunit (D1/D2 LSU) and the ribosomal internal transcribed spacer 1 (ITS1) revealed sequence similarities of 93.5 and 81.3%, respectively, to the closest cultured relatives (Orpinomyces joyonii strain D3A (D1/D2 LSU) and Joblinomyces apicalis strain GFH681 (ITS1). Substrate utilization experiments using the type strain (BB-3T) demonstrated growth capabilities on a wide range of mono-, oligo- and polysaccharides, including glucose, xylose, mannose, fructose, cellobiose, sucrose, maltose, trehalose, lactose, cellulose, xylan, starch and raffinose. We propose accommodating these novel isolates in a new genus and species, for which the name Paucimyces polynucleatus gen. nov., sp. nov. is proposed.
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Affiliation(s)
- Radwa A Hanafy
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74074, USA
| | - Noha H Youssef
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74074, USA
| | - Mostafa S Elshahed
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74074, USA
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35
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Kaspari M, de Beurs KM, Welti EAR. How and why plant ionomes vary across North American grasslands and its implications for herbivore abundance. Ecology 2021; 102:e03459. [PMID: 34171182 DOI: 10.1002/ecy.3459] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 03/29/2021] [Accepted: 05/13/2021] [Indexed: 12/20/2022]
Abstract
Plant elemental content can vary up to 1,000-fold across grasslands, with implications for the herbivores the plants feed. We contrast the regulation, in grasses and forbs, of 12 elements essential to plants and animals (henceforth plant-essential), 7 essential to animals but not plants (animal-essential) and 6 with no known metabolic function (nonessential). Four hypotheses accounted for up to two thirds of the variation in grass and forb ionomes across 54 North American grasslands. Consistent with the supply-side hypothesis, the plant-essential ionome of both forbs and grasses tracked soil availability. Grass ionomes were more likely to harvest even nonessential elements like Cd and Sr. Consistent with the grazing hypothesis, cattle-grazed grasslands also accumulated a handful of metals like Cu and Cr. Consistent with the NP-catalysis hypothesis, increases in the macronutrients N and P in grasses were associated with higher densities of cofactors like Zn and Cu. The plant-essential elements of forbs, in contrast, consistently varied as per the nutrient-dilution hypothesis-there was a decrease in elemental parts per million with increasing local carbohydrate production. Combined, these data fit a working hypothesis that grasses maintain lower elemental densities and survive on nutrient-poor patches by opportunistically harvesting soil nutrients. In contrast, nutrient-rich forbs use episodes of high precipitation and temperature to build new carbohydrate biomass, raising leaves higher to compete for light, but diluting the nutrient content in every bite of tissue. Herbivores of forbs may thus be particularly prone to increases in pCO2 via nutrient dilution.
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Affiliation(s)
- Michael Kaspari
- Geographical Ecology Group, Department of Biology, University of Oklahoma, Norman, Oklahoma, 73019, USA
| | - Kirsten M de Beurs
- Department of Geography and Environmental Sustainability, University of Oklahoma, Norman, Oklahoma, 73019, USA
| | - Ellen A R Welti
- Geographical Ecology Group, Department of Biology, University of Oklahoma, Norman, Oklahoma, 73019, USA.,Senckenberg Research Institute and Natural History Museum Frankfurt, Gelnhausen, 63571, Germany
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Skippington J, Manne T, Veth P. Isotopic Indications of Late Pleistocene and Holocene Paleoenvironmental Changes at Boodie Cave Archaeological Site, Barrow Island, Western Australia. Molecules 2021; 26:2582. [PMID: 33925244 PMCID: PMC8124622 DOI: 10.3390/molecules26092582] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 04/25/2021] [Accepted: 04/26/2021] [Indexed: 11/17/2022] Open
Abstract
This paper presents the first application of mammal tooth enamel carbonate stable isotope analysis for the purpose of investigating late Pleistocene-early Holocene environmental change in an Australian archaeological context. Stable carbon (δ13C) and oxygen (δ18O) isotope ratios were analyzed from archaeological and modern spectacled hare wallaby (Lagorchestes conspicillatus) and hill kangaroo (Osphranter robustus) tooth enamel carbonates from Boodie Cave on Barrow Island in Western Australia. δ18O results track the dynamic paleoecological history at Boodie Cave including a clear shift towards increasing aridity preceding the onset of the Last Glacial Maximum and a period of increased humidity in the early to mid-Holocene. Enamel δ13C reflects divergent species feeding ecology and may imply a long-term shift toward increasing diversity in vegetation structure. This study contributes new data to the carbonate-isotope record for Australian fauna and demonstrates the significant potential of stable isotope based ecological investigations for tracking paleoenvironment change to inter-strata resolution.
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Affiliation(s)
- Jane Skippington
- Archaeology, School of Social Science, University of Western Australia, Perth, WA 6009, Australia;
| | - Tiina Manne
- School of Social Science, University of Queensland, Brisbane, QLD 4072, Australia;
| | - Peter Veth
- Archaeology, School of Social Science, University of Western Australia, Perth, WA 6009, Australia;
- Australian Centre for Excellence in Biodiversity and Heritage, University of Wollongong, Wollongong, NSW 2522, Australia
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37
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McCary MA, Schmitz OJ. Invertebrate functional traits and terrestrial nutrient cycling: Insights from a global meta-analysis. J Anim Ecol 2021; 90:1714-1726. [PMID: 33782983 DOI: 10.1111/1365-2656.13489] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Accepted: 03/12/2021] [Indexed: 11/30/2022]
Abstract
Functional traits are useful for characterizing variation in community and ecosystem dynamics. Most advances in trait-based ecology to date centre on plant functional traits, although there is an increasing recognition that animal traits are also key contributors to processes operating at the community or ecosystem scale. Terrestrial invertebrates are incredibly diverse and ubiquitous animals with important roles in nutrient cycling. Despite their widespread influence on ecosystem processes, we currently lack a synthetic understanding of how invertebrate functional traits affect terrestrial nutrient cycling. We present a meta-analysis of 511 paired observations from 122 papers that examined how invertebrate functional traits affected litter decomposition rates, nitrogen pools and litter C:N ratios. Based on the available data, we specifically assessed the effects of feeding mode (bioturbation, detritus shredding, detritus grazing, leaf chewing, leaf piercing, ambush predators, active hunting predators) and body size (macro- and micro-invertebrates) on nutrient cycling. The effects of invertebrates on terrestrial nutrient cycling varied according to functional trait. The inclusion of both macro- (≥2 mm) and micro-invertebrates (<2 mm) increased litter decomposition by 20% and 19%, respectively. All detritivorous feeding modes enhanced litter decomposition rates, with bioturbators, detritus shredders and detritus grazers increasing decomposition by 28%, 22% and 15%, respectively. Neither herbivore feeding mode (e.g. leaf chewers and leaf piercers) nor predator hunting mode (ambush and active hunting) affected decomposition. We also revealed that bioturbators and detritus grazers increased soil nitrogen availability by 99% and 70%, respectively, and that leaf-chewing herbivores had a weak effect on litterfall stoichiometry via reducing C:N ratios by 11%. Although functional traits might be useful predictors of ecosystem processes, our findings suggest context-dependent effects of invertebrate traits on terrestrial nutrient cycling. Detritivore functional traits (i.e. bioturbators, detritus shredders and detritus grazers) are more consistent with increased rates of nutrient cycling, whereas our currently characterized predator and herbivore traits are less predictive. Future research is needed to identify, standardize and deliberately study the impacts of invertebrate functional traits on nutrient cycling in hopes of revealing the key functional traits governing ecosystem functioning worldwide.
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Chen H, Markham J. The Interactive Effect of Elevated CO2 and Herbivores on the Nitrogen-Fixing Plant Alnus incana ssp. rugosa. Plants (Basel) 2021; 10:440. [PMID: 33652618 PMCID: PMC7996819 DOI: 10.3390/plants10030440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 02/19/2021] [Accepted: 02/22/2021] [Indexed: 11/23/2022]
Abstract
Many studies have found that future predicted CO2 levels can increase plant mass but dilute N content in leaves, impacting antiherbivore compounds. Nitrogen-fixing plants may balance their leaf C:N ratio under elevated CO2, counteracting this dilution effect. However, we know little of how plants respond to herbivores at the higher CO2 levels that occurred when nitrogen-fixing plants first evolved. We grew Alnus incana ssp. rugosa was grown at 400, 800, or 1600 ppm CO2 in soil collected from the field, inoculated with Frankia and exposed to herbivores (Orgyia leucostigma). Elevated CO2 increased nodulated plant biomass and stimulated the nitrogen fixation rate in the early growth stage. However, nitrogen-fixing plants were not able to balance their C:N ratio under elevated CO2 after growing for 19 weeks. When plants were grown at 400 and 1600 ppm CO2, herbivores preferred to feed on leaves of nodulated plants. At 800 ppm CO2, nodulated plants accumulated more total phenolic compounds in response to herbivore damage than plants in the non-Frankia and non-herbivore treatments. Our results suggest that plant leaf defence, not leaf nutritional content, is the dominant driver of herbivory and nitrogen-fixing plants have limited ability to balance C:N ratios at elevated CO2 in natural soil.
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Affiliation(s)
- Haoran Chen
- Department of Biological Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;
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Ensikat HJ, Wessely H, Engeser M, Weigend M. Distribution, Ecology, Chemistry and Toxicology of Plant Stinging Hairs. Toxins (Basel) 2021; 13:141. [PMID: 33668609 DOI: 10.3390/toxins13020141] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/09/2021] [Accepted: 02/11/2021] [Indexed: 12/17/2022] Open
Abstract
Plant stinging hairs have fascinated humans for time immemorial. True stinging hairs are highly specialized plant structures that are able to inject a physiologically active liquid into the skin and can be differentiated from irritant hairs (causing mechanical damage only). Stinging hairs can be classified into two basic types: Urtica-type stinging hairs with the classical "hypodermic syringe" mechanism expelling only liquid, and Tragia-type stinging hairs expelling a liquid together with a sharp crystal. In total, there are some 650 plant species with stinging hairs across five remotely related plant families (i.e., belonging to different plant orders). The family Urticaceae (order Rosales) includes a total of ca. 150 stinging representatives, amongst them the well-known stinging nettles (genus Urtica). There are also some 200 stinging species in Loasaceae (order Cornales), ca. 250 stinging species in Euphorbiaceae (order Malphigiales), a handful of species in Namaceae (order Boraginales), and one in Caricaceae (order Brassicales). Stinging hairs are commonly found on most aerial parts of the plants, especially the stem and leaves, but sometimes also on flowers and fruits. The ecological role of stinging hairs in plants seems to be essentially defense against mammalian herbivores, while they appear to be essentially inefficient against invertebrate pests. Stinging plants are therefore frequent pasture weeds across different taxa and geographical zones. Stinging hairs are usually combined with additional chemical and/or mechanical defenses in plants and are not a standalone mechanism. The physiological effects of stinging hairs on humans vary widely between stinging plants and range from a slight itch, skin rash (urticaria), and oedema to sharp pain and even serious neurological disorders such as neuropathy. Numerous studies have attempted to elucidate the chemical basis of the physiological effects. Since the middle of the 20th century, neurotransmitters (acetylcholine, histamine, serotonin) have been repeatedly detected in stinging hairs of Urticaceae, but recent analyses of Loasaceae stinging hair fluids revealed high variability in their composition and content of neurotransmitters. These substances can explain some of the physiological effects of stinging hairs, but fail to completely explain neuropathic effects, pointing to some yet unidentified neurotoxin. Inorganic ions (e.g., potassium) are detected in stinging hairs and could have synergistic effects. Very recently, ultrastable miniproteins dubbed "gympietides" have been reported from two species of Dendrocnide, arguably the most violently stinging plant. Gympietides are shown to be highly neurotoxic, providing a convincing explanation for Dendrocnide toxicity. For the roughly 648 remaining stinging plant species, similarly convincing data on toxicity are still lacking.
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40
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Song X, Corlett RT. Enemies mediate distance- and density-dependent mortality of tree seeds and seedlings: a meta-analysis of fungicide, insecticide and exclosure studies. Proc Biol Sci 2021; 288:20202352. [PMID: 33468003 DOI: 10.1098/rspb.2020.2352] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Conspecific negative distance- and density-dependence is often assumed to be one of the most important mechanisms controlling forest community assembly and species diversity globally. Plant pathogens, and insect and mammalian herbivores, are the most common natural enemy types that have been implicated in this phenomenon, but their general effects at different plant life stages are still unclear. Here, we conduct a meta-analysis of studies that involved robust manipulative experiments, using fungicides, insecticides and exclosures, to assess the contributions of different natural enemy types to distance- and density-dependent effects at seed and seedling stages. We found that distance- and density-dependent mortality caused by natural enemies was most likely at the seedling stage and was greater at higher mean annual temperatures. Conspecific negative distance- and density-dependence at the seedling stage is significantly weakened when fungicides were applied. By contrast, negative conspecific distance- and density-dependence is not a general pattern at the seed stage. High seed mass reduced distance- and density-dependent mortality at the seed stage. Seed studies excluding only large mammals found significant negative conspecific distance-dependent mortality, but exclusion of all mammals resulted in a non-significant effect of conspecifics. Our study suggests that plant pathogens are a major cause of distance- and density-dependent mortality at the seedling stage, while the impacts of herbivores on seedlings have been understudied. At the seed stage, large and small mammals, respectively, weaken and enhance negative conspecific distance-dependent mortality. Future research should identify specific agents of mortality, investigate the interactions among different enemy types and assess how global change may affect natural enemies and thus influence the strength of conspecific distance- and density-dependence.
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Affiliation(s)
- Xiaoyang Song
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, People's Republic of China.,Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Mengla 666303, People's Republic of China
| | - Richard T Corlett
- Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Mengla 666303, People's Republic of China.,Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, People's Republic of China
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41
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Dreischhoff S, Das IS, Jakobi M, Kasper K, Polle A. Local Responses and Systemic Induced Resistance Mediated by Ectomycorrhizal Fungi. Front Plant Sci 2020; 11:590063. [PMID: 33381131 PMCID: PMC7767828 DOI: 10.3389/fpls.2020.590063] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 11/10/2020] [Indexed: 05/13/2023]
Abstract
Ectomycorrhizal fungi (EMF) grow as saprotrophs in soil and interact with plants, forming mutualistic associations with roots of many economically and ecologically important forest tree genera. EMF ensheath the root tips and produce an extensive extramatrical mycelium for nutrient uptake from the soil. In contrast to other mycorrhizal fungal symbioses, EMF do not invade plant cells but form an interface for nutrient exchange adjacent to the cortex cells. The interaction of roots and EMF affects host stress resistance but uncovering the underlying molecular mechanisms is an emerging topic. Here, we focused on local and systemic effects of EMF modulating defenses against insects or pathogens in aboveground tissues in comparison with arbuscular mycorrhizal induced systemic resistance. Molecular studies indicate a role of chitin in defense activation by EMF in local tissues and an immune response that is induced by yet unknown signals in aboveground tissues. Volatile organic compounds may be involved in long-distance communication between below- and aboveground tissues, in addition to metabolite signals in the xylem or phloem. In leaves of EMF-colonized plants, jasmonate signaling is involved in transcriptional re-wiring, leading to metabolic shifts in the secondary and nitrogen-based defense metabolism but cross talk with salicylate-related signaling is likely. Ectomycorrhizal-induced plant immunity shares commonalities with systemic acquired resistance and induced systemic resistance. We highlight novel developments and provide a guide to future research directions in EMF-induced resistance.
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Affiliation(s)
| | | | | | | | - Andrea Polle
- Forest Botany and Tree Physiology, University of Göttingen, Göttingen, Germany
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42
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Talal S, Cease AJ, Youngblood JP, Farington R, Trumper EV, Medina HE, Rojas JE, Fernando Copa A, Harrison JF. Plant carbohydrate content limits performance and lipid accumulation of an outbreaking herbivore. Proc Biol Sci 2020; 287:20202500. [PMID: 33259763 DOI: 10.1098/rspb.2020.2500] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Locusts are major intermittent threats to food security and the ecological factors determining where and when these occur remain poorly understood. For many herbivores, obtaining adequate protein from plants is a key challenge. We tested how the dietary protein : non-structural carbohydrate ratio (p : c) affects the developmental and physiological performance of 4th-5th instar nymphs of the South American locust, Schistocerca cancellata, which has recently resurged in Argentina, Bolivia and Paraguay. Field marching locusts preferred to feed on high carbohydrate foods. Field-collected juveniles transferred to the laboratory selected artificial diets or local plants with low p : c. On single artificial diets, survival rate increased as foods became more carbohydrate-biased. On single local plants, growth only occurred on the plant with the lowest p : c. Most local plants had p : c ratios substantially higher than optimal, demonstrating that field marching locusts must search for adequate carbohydrate or their survival and growth will be carbohydrate-limited. Total body lipids increased as dietary p : c decreased on both artificial and plant diets, and the low lipid contents of field-collected nymphs suggest that obtaining adequate carbohydrate may pose a strong limitation on migration for S. cancellata. Anthropogenic influences such as conversions of forests to pastures, may increase carbohydrate availability and promote outbreaks and migration of some locusts.
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Affiliation(s)
- Stav Talal
- School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ 85281, USA.,School of Sustainability, Arizona State University, Tempe, AZ, USA
| | - Arianne J Cease
- School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ 85281, USA.,School of Sustainability, Arizona State University, Tempe, AZ, USA
| | - Jacob P Youngblood
- School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ 85281, USA
| | - Ruth Farington
- School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ 85281, USA
| | | | | | - Julio E Rojas
- Departamento de Campañas Fitosanitarias, Dirección de Protección Vegetal, SENAVE, Paraguay
| | - A Fernando Copa
- Universidad Autónoma Gabriel René Moreno, Santa Cruz, Bolivia
| | - Jon F Harrison
- School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ 85281, USA
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43
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Hess M, Paul SS, Puniya AK, van der Giezen M, Shaw C, Edwards JE, Fliegerová K. Anaerobic Fungi: Past, Present, and Future. Front Microbiol 2020; 11:584893. [PMID: 33193229 PMCID: PMC7609409 DOI: 10.3389/fmicb.2020.584893] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Accepted: 09/29/2020] [Indexed: 11/13/2022] Open
Abstract
Anaerobic fungi (AF) play an essential role in feed conversion due to their potent fiber degrading enzymes and invasive growth. Much has been learned about this unusual fungal phylum since the paradigm shifting work of Colin Orpin in the 1970s, when he characterized the first AF. Molecular approaches targeting specific phylogenetic marker genes have facilitated taxonomic classification of AF, which had been previously been complicated by the complex life cycles and associated morphologies. Although we now have a much better understanding of their diversity, it is believed that there are still numerous genera of AF that remain to be described in gut ecosystems. Recent marker-gene based studies have shown that fungal diversity in the herbivore gut is much like the bacterial population, driven by host phylogeny, host genetics and diet. Since AF are major contributors to the degradation of plant material ingested by the host animal, it is understandable that there has been great interest in exploring the enzymatic repertoire of these microorganisms in order to establish a better understanding of how AF, and their enzymes, can be used to improve host health and performance, while simultaneously reducing the ecological footprint of the livestock industry. A detailed understanding of AF and their interaction with other gut microbes as well as the host animal is essential, especially when production of affordable high-quality protein and other animal-based products needs to meet the demands of an increasing human population. Such a mechanistic understanding, leading to more sustainable livestock practices, will be possible with recently developed -omics technologies that have already provided first insights into the different contributions of the fungal and bacterial population in the rumen during plant cell wall hydrolysis.
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Affiliation(s)
- Matthias Hess
- Systems Microbiology & Natural Product Discovery Laboratory, Department of Animal Science, University of California, Davis, Davis, CA, United States
| | - Shyam S. Paul
- Gut Microbiome Lab, ICAR-Directorate of Poultry Research, Indian Council of Agricultural Research, Hyderabad, India
| | - Anil K. Puniya
- Anaerobic Microbiology Lab, ICAR-National Dairy Research Institute, Dairy Microbiology Division, ICAR-National Dairy Research Institute, Karnal, India
| | - Mark van der Giezen
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway
| | - Claire Shaw
- Systems Microbiology & Natural Product Discovery Laboratory, Department of Animal Science, University of California, Davis, Davis, CA, United States
| | - Joan E. Edwards
- Laboratory of Microbiology, Wageningen University & Research, Wageningen, Netherlands
| | - Kateřina Fliegerová
- Laboratory of Anaerobic Microbiology, Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Prague, Czechia
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44
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Krey KL, Nabity PD, Blubaugh CK, Fu Z, Van Leuven JT, Reganold JP, Berim A, Gang DR, Jensen AS, Snyder WE. Organic Farming Sharpens Plant Defenses in the Field. Front Sustain Food Syst 2020; 4. [PMID: 33073178 DOI: 10.3389/fsufs.2020.00097] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Plants deploy a variety of chemical and physical defenses to protect themselves against herbivores and pathogens. Organic farming seeks to enhance these responses by improving soil quality, ultimately altering bottom up regulation of plant defenses. While laboratory studies suggest this approach is effective, it remains unclear whether organic agriculture encourages more-active plant defenses under real-world conditions. Working on the farms of cooperating growers, we examined gene expression in the leaves of two potato (Solanum tuberosum) varieties, grown on organic vs. conventional farms. For one variety, Norkotah, we found significantly heightened initiation of genes associated with plant-defense pathways in plants grown in organic vs. conventional fields. Organic Norkotah fields exhibited lower levels of nitrate in soil and of nitrogen in plant foliage, alongside differences in communities of soil bacteria, suggesting possible links between soil management and observed differences in plant defenses. Additionally, numbers of predatory and phloem-feeding insects were higher in organic than conventional fields. A second potato variety, Alturas, which is generally grown using fewer inputs and in poorer-quality soils, exhibited lower overall herbivore and predator numbers, few differences in soil ecology, and no differences in gene-activity in organic and conventional farming systems. Altogether, our results suggest that organic farming has the potential to increase plants' resistance to herbivores, possibly facilitating reduced need for insecticide applications. These benefits appear to be mediated by plant variety and/or farming context.
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Affiliation(s)
- Karol L Krey
- Department of Entomology, Washington State University, Pullman, WA, United States
| | - Paul D Nabity
- Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA, United States
| | - Carmen K Blubaugh
- Plant and Environmental Sciences Department, Clemson University, Clemson, SC, United States
| | - Zhen Fu
- Department of Entomology, Washington State University, Pullman, WA, United States.,Department of Entomology, Texas A&M University, College Station, TX, United States
| | - James T Van Leuven
- Department of Biological Sciences, University of Idaho, Moscow, ID, United States
| | - John P Reganold
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, United States
| | - Anna Berim
- Institute of Biological Chemistry, Washington State University, Pullman, WA, United States
| | - David R Gang
- Institute of Biological Chemistry, Washington State University, Pullman, WA, United States
| | - Andrew S Jensen
- Northwest Potato Research Consortium, Lakeview, OR, United States
| | - William E Snyder
- Department of Entomology, University of Georgia, Athens, GA, United States
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45
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Negash EW, Alemseged Z, Bobe R, Grine F, Sponheimer M, Wynn JG. Dietary trends in herbivores from the Shungura Formation, southwestern Ethiopia. Proc Natl Acad Sci U S A 2020; 117:21921-7. [PMID: 32839326 DOI: 10.1073/pnas.2006982117] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Diet provides critical information about the ecology and environment of herbivores. Hence, understanding the dietary strategies of fossil herbivores and the associated temporal changes is one aspect of inferring paleoenvironmental conditions. Here, we present carbon isotope data from more than 1,050 fossil teeth that record the dietary patterns of nine herbivore families in the late Pliocene and early Pleistocene (3.6 to 1.05 Ma) from the Shungura Formation, a hominin-bearing site in southwestern Ethiopia. An increasing trend toward C4 herbivory has been observed with attendant reductions in the proportions of browsers and mixed feeders through time. A high proportion of mixed feeders has been observed prior to 2.9 Ma followed by a decrease in the proportion of mixed feeders and an increase in grazers between 2.7 and 1.9 Ma, and a further increase in the proportion of grazers after 1.9 Ma. The collective herbivore fauna shows two major change points in carbon isotope values at ∼2.7 and ∼2.0 Ma. While hominin fossils from the sequence older than 2.7 Ma are attributed to Australopithecus, the shift at ∼2.7 Ma indicating the expansion of C4 grasses on the landscape was concurrent with the first appearance of Paranthropus The link between the increased C4 herbivory and more open landscapes suggests that Australopithecus lived in more wooded landscapes compared to later hominins such as Paranthropus and Homo, and has implications for key morphological and behavioral adaptations in our lineage.
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46
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Seraphim MJ, Sloman KA, Alexander ME, Janetski N, Jompa J, Ambo-Rappe R, Snellgrove D, Mars F, Harborne AR. Interactions between coral restoration and fish assemblages: implications for reef management. J Fish Biol 2020; 97:633-655. [PMID: 32564370 DOI: 10.1111/jfb.14440] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 06/01/2020] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
Corals create complex reef structures that provide both habitat and food for many fish species. Because of numerous natural and anthropogenic threats, many coral reefs are currently being degraded, endangering the fish assemblages they support. Coral reef restoration, an active ecological management tool, may help reverse some of the current trends in reef degradation through the transplantation of stony corals. Although restoration techniques have been extensively reviewed in relation to coral survival, our understanding of the effects of adding live coral cover and complexity on fishes is in its infancy with a lack of scientifically validated research. This study reviews the limited data on reef restoration and fish assemblages, and complements this with the more extensive understanding of complex interactions between natural reefs and fishes and how this might inform restoration efforts. It also discusses which key fish species or functional groups may promote, facilitate or inhibit restoration efforts and, in turn, how restoration efforts can be optimised to enhance coral fish assemblages. By highlighting critical knowledge gaps in relation to fishes and restoration interactions, the study aims to stimulate research into the role of reef fishes in restoration projects. A greater understanding of the functional roles of reef fishes would also help inform whether restoration projects can return fish assemblages to their natural compositions or whether alternative species compositions develop, and over what timeframe. Although alleviation of local and global reef stressors remains a priority, reef restoration is an important tool; an increased understanding of the interactions between replanted corals and the fishes they support is critical for ensuring its success for people and nature.
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Affiliation(s)
- Marie J Seraphim
- School of Health and Life Sciences, University of the West of Scotland, Paisley, UK
| | - Katherine A Sloman
- School of Health and Life Sciences, University of the West of Scotland, Paisley, UK
| | - Mhairi E Alexander
- School of Health and Life Sciences, University of the West of Scotland, Paisley, UK
| | | | - Jamaluddin Jompa
- Faculty of Marine Science and Fisheries, Hasanuddin University, Makassar, Indonesia
| | - Rohani Ambo-Rappe
- Faculty of Marine Science and Fisheries, Hasanuddin University, Makassar, Indonesia
| | - Donna Snellgrove
- Waltham Petcare Science Institute, Melton Mowbray, Leicestershire, UK
| | | | - Alastair R Harborne
- Institute of Environment and Department of Biological Sciences, Florida International University, North Miami, Florida, USA
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47
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Zeng JY, Wu DD, Shi ZB, Yang J, Zhang GC, Zhang J. Influence of dietary aconitine and nicotine on the gut microbiota of two lepidopteran herbivores. Arch Insect Biochem Physiol 2020; 104:e21676. [PMID: 32323892 DOI: 10.1002/arch.21676] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 03/12/2020] [Accepted: 03/26/2020] [Indexed: 06/11/2023]
Abstract
The gut microbiota plays an important role in pheromone production, pesticide degradation, vitamin synthesis, and pathogen prevention in the host animal. Therefore, similar to gut morphology and digestive enzyme activity, the gut microbiota may also get altered under plant defensive compound-induced stress. To test this hypothesis, Dendrolimus superans larvae were fed either aconitine- or nicotine-treated fresh leaves of Larix gmelinii, and Lymantria dispar larvae were fed either aconitine- or nicotine-treated fresh leaves of Salix matsudana. Subsequently, the larvae were sampled 72hr after diet administration and DNA extracted from larval enteric canals were employed for gut microbial 16S ribosomal RNA gene sequencing (338 F and 806 R primers). The sequence analysis revealed that dietary nicotine and aconitine influenced the dominant bacteria in the larval gut and determined their abundance. Moreover, the effect of either aconitine or nicotine on D. superans and L. dispar larvae had a greater dependence on insect species than on secondary plant metabolites. These findings further our understanding of the interaction between herbivores and host plants and the coevolution of plants and insects.
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Affiliation(s)
- Jian-Yong Zeng
- Department of Forest Protection, School of Forestry, Northeast Forestry University, Harbin, China
| | - De-Dong Wu
- Department of Forest Protection, School of Forestry, Northeast Forestry University, Harbin, China
| | - Zhong-Bin Shi
- Department of Forest Protection, School of Forestry, Northeast Forestry University, Harbin, China
| | - Jing Yang
- Department of Forest Protection, School of Forestry, Northeast Forestry University, Harbin, China
| | - Guo-Cai Zhang
- Department of Forest Protection, School of Forestry, Northeast Forestry University, Harbin, China
| | - Jie Zhang
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration, Ministry of Education, College of Life Science, Northeast Forestry University, Harbin, China
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48
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Deaker DJ, Agüera A, Lin HA, Lawson C, Budden C, Dworjanyn SA, Mos B, Byrne M. The hidden army: corallivorous crown-of-thorns seastars can spend years as herbivorous juveniles. Biol Lett 2020; 16:20190849. [PMID: 32264781 DOI: 10.1098/rsbl.2019.0849] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Crown-of-thorns seastar (COTS) outbreaks are a major threat to coral reefs. Although the herbivorous juveniles and their switch to corallivory are key to seeding outbreaks, they remain a black box in our understanding of COTS. We investigated the impact of a delay in diet transition due to coral scarcity in cohorts reared on crustose coralline algae for 10 months and 6.5 years before being offered coral. Both cohorts achieved an asymptotic size (16-18 mm diameter) on algae and had similar exponential growth on coral. After 6.5 years of herbivory, COTS were competent coral predators. This trophic and growth plasticity results in a marked age-size disconnect adding unappreciated complexity to COTS boom-bust dynamics. The potential that herbivorous juveniles accumulate in the reef infrastructure to seed outbreaks when favourable conditions arise has implications for management of COTS populations.
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Affiliation(s)
- Dione J Deaker
- School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | | | - Huang-An Lin
- National Marine Science Centre, Southern Cross University, Coffs Harbour, New South Wales, Australia
| | - Corinne Lawson
- National Marine Science Centre, Southern Cross University, Coffs Harbour, New South Wales, Australia
| | - Claire Budden
- School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Symon A Dworjanyn
- National Marine Science Centre, Southern Cross University, Coffs Harbour, New South Wales, Australia
| | - Benjamin Mos
- National Marine Science Centre, Southern Cross University, Coffs Harbour, New South Wales, Australia
| | - Maria Byrne
- School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia.,School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
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49
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Pineda A, Kaplan I, Hannula SE, Ghanem W, Bezemer TM. Conditioning the soil microbiome through plant-soil feedbacks suppresses an aboveground insect pest. New Phytol 2020; 226:595-608. [PMID: 31863484 PMCID: PMC7155073 DOI: 10.1111/nph.16385] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Accepted: 12/04/2019] [Indexed: 05/21/2023]
Abstract
Soils and their microbiomes are now recognized as key components of plant health, but how to steer those microbiomes to obtain their beneficial functions is still unknown. Here, we assess whether plant-soil feedbacks can be applied in a crop system to shape soil microbiomes that suppress herbivorous insects in above-ground tissues. We used four grass and four forb species to condition living soil. Then we inoculated those soil microbiomes into sterilized soil and grew chrysanthemum as a focal plant. We evaluated the soil microbiome in the inocula and after chrysanthemum growth, as well as plant and herbivore parameters. We show that inocula and inoculated soil in which a focal plant had grown harbor remarkably different microbiomes, with the focal plant exerting a strong negative effect on fungi, especially arbuscular mycorrhizal fungi. Soil inoculation consistently induced resistance against the thrips Frankliniella occidentalis, but not against the mite Tetranychus urticae, when compared with sterilized soil. Additionally, plant species shaped distinct microbiomes that had different effects on thrips, chlorogenic acid concentrations in leaves and plant growth. This study provides a proof-of-concept that the plant-soil feedback concept can be applied to steer soil microbiomes with the goal of inducing resistance above ground against herbivorous insects.
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Affiliation(s)
- Ana Pineda
- Department of Terrestrial EcologyNetherlands Institute of Ecology (NIOO‐KNAW)Wageningen6700 ABthe Netherlands
| | - Ian Kaplan
- Department of Terrestrial EcologyNetherlands Institute of Ecology (NIOO‐KNAW)Wageningen6700 ABthe Netherlands
- Department of EntomologyPurdue UniversityWest LafayetteIN47907USA
| | - S. Emilia Hannula
- Department of Terrestrial EcologyNetherlands Institute of Ecology (NIOO‐KNAW)Wageningen6700 ABthe Netherlands
| | - Wadih Ghanem
- Department of Terrestrial EcologyNetherlands Institute of Ecology (NIOO‐KNAW)Wageningen6700 ABthe Netherlands
- Department of EntomologyPurdue UniversityWest LafayetteIN47907USA
| | - T. Martijn Bezemer
- Department of Terrestrial EcologyNetherlands Institute of Ecology (NIOO‐KNAW)Wageningen6700 ABthe Netherlands
- Institute of BiologySection Plant Ecology and PhytochemistryLeiden UniversityLeiden2300 RAthe Netherlands
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50
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Pausas JG, Bond WJ. Alternative Biome States in Terrestrial Ecosystems. Trends Plant Sci 2020; 25:250-263. [PMID: 31917105 DOI: 10.1016/j.tplants.2019.11.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 11/06/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
There is growing interest in the application of alternative stable state (ASS) theory to explain major vegetation patterns of the world. Here, we introduce the theory as applied to the puzzle of nonforested (open) biomes growing in climates that are warm and wet enough to support forests (alternative biome states, ABSs). Long thought to be the product of deforestation, diverse lines of evidence indicate that many open ecosystems are ancient. They have also been characterized as 'early successional' even where they persist for millennia. ABS is an alternative framework to that of climate determinism and succession for exploring forest/nonforest mosaics. This framework explains not only tropical forest-savanna landscapes, but also other landscape mosaics across the globe.
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Affiliation(s)
- Juli G Pausas
- Centro de Investigaciones sobre Desertificación (CIDE-CSIC), 46113 Montcada, Valencia, Spain.
| | - William J Bond
- Department of Biological Sciences, University of Cape Town, Rondebosch 7701, Cape Town, South Africa; South African Environmental Observation Network, National Research Foundation, Private Bag X7, Claremont 7735, South Africa
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