101
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LaManna JA, Jones FA, Bell DM, Pabst RJ, Shaw DC. Tree species diversity increases with conspecific negative density dependence across an elevation gradient. Ecol Lett 2022; 25:1237-1249. [PMID: 35291051 DOI: 10.1111/ele.13996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 01/24/2022] [Accepted: 02/13/2022] [Indexed: 11/30/2022]
Abstract
Elevational and latitudinal gradients in species diversity may be mediated by biotic interactions that cause density-dependent effects of conspecifics on survival or growth to differ from effects of heterospecifics (i.e. conspecific density dependence), but limited evidence exists to support this. We tested the hypothesis that conspecific density dependence varies with elevation using over 40 years of data on tree survival and growth from 23 old-growth temperate forest stands across a 1,000-m elevation gradient. We found that conspecific-density-dependent effects on survival of small-to-intermediate-sized focal trees were negative in lower elevation, higher diversity forest stands typically characterised by warmer temperatures and greater relative humidity. Conspecific-density-dependent effects on survival were less negative in higher elevation stands and ridges than in lower elevation stands and valley bottoms for small-to-intermediate-sized trees, but were neutral for larger trees across elevations. Conspecific-density-dependent effects on growth were negative across all tree size classes and elevations. These findings reveal fundamental differences in biotic interactions that may contribute to relationships between species diversity, elevation and climate.
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Affiliation(s)
- Joseph A LaManna
- Department of Biological Sciences, Marquette University, Milwaukee, Wisconsin, USA
| | - F Andrew Jones
- Department of Botany & Plant Pathology, Oregon State University, Corvallis, Oregon, USA.,Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
| | - David M Bell
- Pacific Northwest Research Station, USDA Forest Service, Corvallis, Oregon, USA
| | - Robert J Pabst
- Department of Forest Ecosystems & Society, Oregon State University, Corvallis, Oregon, USA
| | - David C Shaw
- Department of Forest Engineering, Resources, and Management, Oregon State University, Corvallis, Oregon, USA
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102
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Koskinen JS, Abrego N, Vesterinen EJ, Schulz T, Roslin T, Nyman T. Imprints of latitude, host taxon, and decay stage on fungus‐associated arthropod communities. ECOL MONOGR 2022. [DOI: 10.1002/ecm.1516] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Janne S. Koskinen
- Department of Environmental and Biological Sciences University of Eastern Finland Joensuu Finland
- Department of Agricultural Sciences University of Helsinki Finland
| | - Nerea Abrego
- Department of Agricultural Sciences University of Helsinki Finland
- Department of Biological and Environmental Science University of Jyväskylä Finland
| | | | - Torsti Schulz
- Organismal and Evolutionary Biology Research Programme University of Helsinki Finland
| | - Tomas Roslin
- Department of Agricultural Sciences University of Helsinki Finland
- Department of Ecology Swedish University of Agricultural Sciences Uppsala Sweden
| | - Tommi Nyman
- Department of Ecosystems in the Barents Region Norwegian Institute of Bioeconomy Research Svanvik Norway
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103
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Horák K, Bobek L, Adámková M, Kauzál O, Kauzálová T, Manialeu JP, Nguelefack TB, Nana ED, Jønsson KA, Munclinger P, Hořák D, Sedláček O, Tomášek O, Albrecht T. Feather growth and quality across passerines is explained by breeding rather than moulting latitude. Proc Biol Sci 2022; 289:20212404. [PMID: 35259984 PMCID: PMC8905169 DOI: 10.1098/rspb.2021.2404] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Tropical bird species are characterized by a comparatively slow pace of life, being predictably different from their temperate zone counterparts in their investments in growth, survival and reproduction. In birds, the development of functional plumage is often considered energetically demanding investment, with consequences on individual fitness and survival. However, current knowledge of interspecific variation in feather growth patterns is mostly based on species of the northern temperate zone. We evaluated patterns in tail feather growth rates (FGR) and feather quality (stress-induced fault bar occurrence; FBO), using 1518 individuals of 167 species and 39 passerine families inhabiting Afrotropical and northern temperate zones. We detected a clear difference in feather traits between species breeding in the temperate and tropical zones, with the latter having significantly slower FGR and three times higher FBO. Moreover, trans-Saharan latitudinal migrants resembled temperate zone residents in that they exhibited a comparatively fast FGR and low FBO, despite sharing moulting environments with tropical species. Our results reveal convergent latitudinal shifts in feather growth investments (latitudinal syndrome) across unrelated passerine families and underscore the importance of breeding latitude in determining cross-species variation in key avian life-history traits.
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Affiliation(s)
- Kryštof Horák
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic.,Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Lukáš Bobek
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic.,Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Marie Adámková
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic
| | - Ondřej Kauzál
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic.,Department of Ecology, Charles University, Prague, Czech Republic
| | - Tereza Kauzálová
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic.,Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Judith Pouadjeu Manialeu
- Laboratory of Animal Physiology and Phytopharmacology, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Télesphore Benoît Nguelefack
- Laboratory of Animal Physiology and Phytopharmacology, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Eric Djomo Nana
- Agricultural Research Institute for Development (IRAD), Nkolbisson-Yaoundé, Cameroon.,Department of Zoology, University of Oxford, Oxford, United Kingdom
| | | | - Pavel Munclinger
- Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic
| | - David Hořák
- Department of Ecology, Charles University, Prague, Czech Republic
| | - Ondřej Sedláček
- Department of Ecology, Charles University, Prague, Czech Republic
| | - Oldřich Tomášek
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic.,Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Tomáš Albrecht
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic.,Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic
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104
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Freeman BG, Weeks T, Schluter D, Tobias JA. The latitudinal gradient in rates of evolution for bird beaks, a species interaction trait. Ecol Lett 2022; 25:635-646. [PMID: 35199924 DOI: 10.1111/ele.13726] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/21/2020] [Accepted: 02/11/2021] [Indexed: 11/29/2022]
Abstract
Where is evolution fastest? The biotic interactions hypothesis proposes that greater species richness creates more ecological opportunity, driving faster evolution at low latitudes, whereas the 'empty niches' hypothesis proposes that ecological opportunity is greater where diversity is low, spurring faster evolution at high latitudes. We tested these contrasting predictions by analysing rates of beak evolution for a global dataset of 1141 avian sister species. Rates of beak size evolution are similar across latitudes, with some evidence that beak shape evolves faster in the temperate zone, consistent with the empty niches hypothesis. The empty niches hypothesis is further supported by a meta-analysis showing that rates of trait evolution and recent speciation are generally faster in the temperate zone, whereas rates of molecular evolution are slightly faster in the tropics. Our results suggest that drivers of evolutionary diversification are either similar across latitudes or more potent in the temperate zone, thus calling into question multiple hypotheses that invoke faster tropical evolution to explain the latitudinal diversity gradient.
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Affiliation(s)
- Benjamin G Freeman
- Biodiversity Research Centre, University of British Columbia, Vancouver, Canada.,Department of Zoology, University of British Columbia, Vancouver, Canada
| | - Thomas Weeks
- Department of Life Sciences, Imperial College London, London, UK.,Department of Life Sciences, Natural History Museum, London, UK
| | - Dolph Schluter
- Biodiversity Research Centre, University of British Columbia, Vancouver, Canada.,Department of Zoology, University of British Columbia, Vancouver, Canada
| | - Joseph A Tobias
- Department of Life Sciences, Imperial College London, London, UK
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105
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McFadden IR, Fritz SA, Zimmermann NE, Pellissier L, Kissling WD, Tobias JA, Schleuning M, Graham CH. Global plant-frugivore trait matching is shaped by climate and biogeographic history. Ecol Lett 2022; 25:686-696. [PMID: 35199916 PMCID: PMC9302656 DOI: 10.1111/ele.13890] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 03/27/2021] [Accepted: 09/03/2021] [Indexed: 01/05/2023]
Abstract
Species interactions are influenced by the trait structure of local multi‐trophic communities. However, it remains unclear whether mutualistic interactions in particular can drive trait patterns at the global scale, where climatic constraints and biogeographic processes gain importance. Here we evaluate global relationships between traits of frugivorous birds and palms (Arecaceae), and how these relationships are affected, directly or indirectly, by assemblage richness, climate and biogeographic history. We leverage a new and expanded gape size dataset for nearly all avian frugivores, and find a positive relationship between gape size and fruit size, that is, trait matching, which is influenced indirectly by palm richness and climate. We also uncover a latitudinal gradient in trait matching strength, which increases towards the tropics and varies among zoogeographic realms. Taken together, our results suggest trophic interactions have consistent influences on trait structure, but that abiotic, biogeographic and richness effects also play important, though sometimes indirect, roles in shaping the functional biogeography of mutualisms.
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Affiliation(s)
- Ian R McFadden
- Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland.,Department of Environmental Systems Science, ETH Zürich, Zurich, Switzerland
| | - Susanne A Fritz
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, Germany.,Institut für Geowissenschaften, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Niklaus E Zimmermann
- Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland
| | - Loïc Pellissier
- Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland.,Department of Environmental Systems Science, ETH Zürich, Zurich, Switzerland
| | - W Daniel Kissling
- Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Amsterdam, The Netherlands
| | - Joseph A Tobias
- Department of Life Sciences, Imperial College London, Ascot, UK
| | - Matthias Schleuning
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, Germany
| | - Catherine H Graham
- Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland
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106
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Gross CP, Duffy JE, Hovel KA, Kardish MR, Reynolds PL, Boström C, Boyer KE, Cusson M, Eklöf J, Engelen AH, Eriksson BK, Fodrie FJ, Griffin JN, Hereu CM, Hori M, Hughes AR, Ivanov MV, Jorgensen P, Kruschel C, Lee KS, Lefcheck J, McGlathery K, Moksnes PO, Nakaoka M, O'Connor MI, O'Connor NE, Olsen JL, Orth RJ, Peterson BJ, Reiss H, Rossi F, Ruesink J, Sotka EE, Thormar J, Tomas F, Unsworth R, Voigt EP, Whalen MA, Ziegler SL, Stachowicz JJ. The biogeography of community assembly: latitude and predation drive variation in community trait distribution in a guild of epifaunal crustaceans. Proc Biol Sci 2022; 289:20211762. [PMID: 35193403 PMCID: PMC8864368 DOI: 10.1098/rspb.2021.1762] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 01/14/2022] [Indexed: 01/15/2023] Open
Abstract
While considerable evidence exists of biogeographic patterns in the intensity of species interactions, the influence of these patterns on variation in community structure is less clear. Studying how the distributions of traits in communities vary along global gradients can inform how variation in interactions and other factors contribute to the process of community assembly. Using a model selection approach on measures of trait dispersion in crustaceans associated with eelgrass (Zostera marina) spanning 30° of latitude in two oceans, we found that dispersion strongly increased with increasing predation and decreasing latitude. Ocean and epiphyte load appeared as secondary predictors; Pacific communities were more overdispersed while Atlantic communities were more clustered, and increasing epiphytes were associated with increased clustering. By examining how species interactions and environmental filters influence community structure across biogeographic regions, we demonstrate how both latitudinal variation in species interactions and historical contingency shape these responses. Community trait distributions have implications for ecosystem stability and functioning, and integrating large-scale observations of environmental filters, species interactions and traits can help us predict how communities may respond to environmental change.
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Affiliation(s)
- Collin P. Gross
- Department of Evolution and Ecology, University of California, Davis, CA, USA
| | - J. Emmett Duffy
- Tennenbaum Marine Observatories Network, MarineGEO, Smithsonian Environmental Research Center, Edgewater, MD, USA
| | - Kevin A. Hovel
- Department of Biology, San Diego State University, San Diego, CA, USA
| | - Melissa R. Kardish
- Department of Evolution and Ecology, University of California, Davis, CA, USA
| | - Pamela L. Reynolds
- DataLab: Data Science and Informatics, University of California, Davis, CA, USA
| | - Christoffer Boström
- Department of Environmental and Marine Biology, Åbo Akademi University, Åbo, Finland
| | - Katharyn E. Boyer
- Estuary & Ocean Science Center and Department of Biology, San Francisco State University, San Francisco, CA, USA
| | - Mathieu Cusson
- Sciences fondamentales and Québec Océan, Université du Québec à Chicoutimi, Chicoutimi, Quebec, Canada
| | - Johan Eklöf
- Department of Ecology, Environment and Plant Sciences (DEEP), Stockholm University, Stockholm, Sweden
| | | | | | - F. Joel Fodrie
- Institute of Marine Sciences, University of North Carolina at Chapel Hill, Morehead City, NC, USA
| | | | - Clara M. Hereu
- Universidad Autónoma de Baja California, Mexicali, Baja CA, Mexico
| | - Masakazu Hori
- Fisheries Research and Education Agency, Hatsukaichi, Hiroshima, Japan
| | - A. Randall Hughes
- Department of Marine and Environmental Sciences, Northeastern University, Nahant, MA, USA
| | - Mikhail V. Ivanov
- Department of Ichthyology and Hydrobiology, St Petersburg State University, St Petersburg, Russia
| | - Pablo Jorgensen
- Instituto de Ciencias Polares, Ambiente y Recursos Naturales, Universidad Nacional de Tierra del Fuego, Ushuaia, Tierra del Fuego, Antártida e Islas del Atlántico Sur, Argentina
| | | | - Kun-Seop Lee
- Department of Biological Sciences, Pusan National University, Busan, South Korea
| | - Jonathan Lefcheck
- DataLab: Data Science and Informatics, University of California, Davis, CA, USA
| | - Karen McGlathery
- Department of Environmental Sciences, University of Virginia, Charlottesville, VA, USA
| | - Per-Olav Moksnes
- Department of Marine Sciences, University of Gothenburg, Goteborg, Sweden
| | | | - Mary I. O'Connor
- Biodiversity Research Centre and Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Nessa E. O'Connor
- School of Natural Sciences, Trinity College Dublin, Dublin, Republic of Ireland
| | | | - Robert J. Orth
- Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, VA, USA
| | - Bradley J. Peterson
- School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, USA
| | | | - Francesca Rossi
- Centre National de la Récherche Scientifique, ECOSEAS Laboratory, Université de Cote d'Azur, Nice, France
| | - Jennifer Ruesink
- Department of Biology, University of Washington, Seattle, WA, USA
| | - Erik E. Sotka
- Grice Marine Laboratory, College of Charleston, Charleston, SC, USA
| | | | - Fiona Tomas
- IMEDEAS (CSIC), Esporles, Islas Baleares, Spain
| | | | - Erin P. Voigt
- Department of Biology, San Diego State University, San Diego, CA, USA
| | - Matthew A. Whalen
- Hakai Institute, Campbell River, British Columbia, Canada
- University of British Columbia, Vancouver, British Columbia, Canada
| | | | - John J. Stachowicz
- Department of Evolution and Ecology, University of California, Davis, CA, USA
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107
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Sinha A, Menzies RK, Chatterjee N, Rao M, Naniwadekar R. Drivers of Taxonomic, Phylogenetic, and Functional Beta Diversity of Himalayan Riverine Birds. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.788184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abiotic and biotic factors drive compositional differences among local species assemblages. Determining the influence of different drivers on beta diversity patterns can provide insights into processes governing community organization. Examining beta diversity patterns along taxonomic, phylogenetic and functional dimensions enables a nuanced understanding of underlying processes that govern community assembly and dynamics. The dynamic and complex riparian habitats in the Himalaya, and the hyper-diverse riverine bird community offer a fascinating setup to examine the role of environmental factors in influencing community structuring. Using a large dataset on river bird communities from field census across multiple drainages in the Indian Himalaya, we aimed at discerning processes that structure these communities through an understanding of pair-wise dissimilarities in species composition across sites. We determined the relative contributions of turnover and nestedness in taxonomic, phylogenetic, and functional beta diversity patterns in the Eastern and Western Himalaya that differ in species richness. Generalized Dissimilarity Modeling was used to examine the relative contributions of climatic, geographic, and anthropogenic factors toward explaining different metrics of beta diversity. The riverine bird communities in the drier and seasonal Western Himalaya were poorer in species richness, more phylogenetically and functionally clustered than that in the Eastern Himalaya. The contribution of the turnover component to the overall beta diversity was higher than the nestedness component in river bird communities, particularly in the Eastern Himalaya. Habitat and climatic factors differentially influenced the beta diversity patterns in both Eastern and Western Himalaya, with river width consistently explaining a large variation in beta diversity in the east and the west. The results show that environmental filtering plays a crucial role in structuring riverine bird communities in the Himalayan headwaters, highlighting the need to ameliorate the threats posed by the slew of hydroelectric projects and forest loss in the region.
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108
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La Richelière F, Muñoz G, Guénard B, Dunn RR, Economo EP, Powell S, Sanders NJ, Weiser MD, Abouheif E, Lessard JP. Warm and arid regions of the world are hotspots of superorganism complexity. Proc Biol Sci 2022; 289:20211899. [PMID: 35135345 PMCID: PMC8832517 DOI: 10.1098/rspb.2021.1899] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Biologists have long been fascinated by the processes that give rise to phenotypic complexity of organisms, yet whether there exist geographical hotspots of phenotypic complexity remains poorly explored. Phenotypic complexity can be readily observed in ant colonies, which are superorganisms with morphologically differentiated queen and worker castes analogous to the germline and soma of multicellular organisms. Several ant species have evolved 'worker polymorphism', where workers in a single colony show quantifiable differences in size and head-to-body scaling. Here, we use 256 754 occurrence points from 8990 ant species to investigate the geography of worker polymorphism. We show that arid regions of the world are the hotspots of superorganism complexity. Tropical savannahs and deserts, which are typically species-poor relative to tropical or even temperate forests, harbour the highest densities of polymorphic ants. We discuss the possible adaptive advantages that worker polymorphism provides in arid environments. Our work may provide a window into the environmental conditions that promote the emergence of highly complex phenotypes.
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Affiliation(s)
- Frédérique La Richelière
- Department of Biology, Concordia University, 7141 Sherbrooke Street West, Montreal, Canada, H4B 1R6,Department of Biology, McGill University, 1205 Docteur Penfield, Montreal, Canada, H3A 1B1
| | - Gabriel Muñoz
- Department of Biology, Concordia University, 7141 Sherbrooke Street West, Montreal, Canada, H4B 1R6
| | - Benoit Guénard
- School of Biological Sciences, University of Hong Kong, Pok Fu Lam Road, Hong Kong SAR, People's Republic of China
| | - Robert R. Dunn
- Department of Applied Ecology, North Carolina State University, 3510 Thomas Hall, Raleigh, NC, 27695, USA
| | - Evan P. Economo
- Biodiversity and Biocomplexity Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa 904-0495, Japan
| | - Scott Powell
- Department of Biological Sciences, George Washington University, Washington, DC, USA
| | - Nathan J. Sanders
- Department of Ecology and Evolutionary Biology, 1105 North University Ave Biological Sciences Building, University of Michigan Ann Arbor, MI 48109-1085, USA
| | - Michael D. Weiser
- Geographical Ecology Group, Department of Biology, University of Oklahoma, 730 Van Vleet Oval, Norman, OK 73019, USA
| | - Ehab Abouheif
- Department of Biology, McGill University, 1205 Docteur Penfield, Montreal, Canada, H3A 1B1
| | - Jean-Philippe Lessard
- Department of Biology, Concordia University, 7141 Sherbrooke Street West, Montreal, Canada, H4B 1R6
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109
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Liu W, Chen X, Wang J, Zhang Y. Does the effect of flowering time on biomass allocation across latitudes differ between invasive and native salt marsh grass Spartina alterniflora? Ecol Evol 2022; 12:e8681. [PMID: 35309742 PMCID: PMC8901870 DOI: 10.1002/ece3.8681] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 01/26/2022] [Accepted: 02/07/2022] [Indexed: 12/29/2022] Open
Abstract
Parallel latitudinal clines in flowering time have been documented in both the invasive and native ranges of plants. Furthermore, flowering time has been found to affect biomass at maturity. Therefore, understanding how these flowering times affect biomass accumulation across latitudes is essential to understanding plant adaptations and distributions.We investigated and compared trends in first flowering day (FFD), aboveground biomass (AGB), belowground biomass (BGB), and BGB:AGB ratio of the salt marsh grass Spartina alterniflora along latitudinal gradients from the invasive (China, 19-40°N) and native range (United States, 27-43°N) in a greenhouse common garden experiment, and tested whether FFD would drive these divergences between invasive and native ranges.The invasive populations produced more (~20%, ~19%) AGB and BGB than native populations, but there were no significant differences in the FFD and BGB:AGB ratio. We found significant parallel latitudinal clines in FFD in both invasive and native ranges. In addition, the BGB:AGB ratio was negatively correlated with the FFD in both the invasive and native ranges but nonsignificant in invasive populations. In contrast, AGB and BGB increased with latitude in the invasive range, but declined with latitude in the native range. Most interestingly, we found AGB and BGB positively correlated with the FFD in the native range, but no significant relationships in the invasive range.Our results indirectly support the evolution of increased competitive ability hypothesis (EICA) that S. alterniflora has evolved to produce greater AGB and BGB in China, but the flowering and allocation pattern of native populations is maintained in the invasive range. Our results also suggest that invasive S. alterniflora in China is not constrained by the trade-off of earlier flowering with smaller size, and that flowering time has played an important role in biomass allocation across latitudes.
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Affiliation(s)
- Wenwen Liu
- Key Laboratory of the Ministry of Education for Coastal and Wetland EcosystemsCollege of the Environment and EcologyXiamen UniversityFujianChina
| | - Xincong Chen
- Key Laboratory of the Ministry of Education for Coastal and Wetland EcosystemsCollege of the Environment and EcologyXiamen UniversityFujianChina
| | - Jiayu Wang
- Key Laboratory of the Ministry of Education for Coastal and Wetland EcosystemsCollege of the Environment and EcologyXiamen UniversityFujianChina
| | - Yihui Zhang
- Key Laboratory of the Ministry of Education for Coastal and Wetland EcosystemsCollege of the Environment and EcologyXiamen UniversityFujianChina
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110
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Zbinden ZD. A needle in the haystack? Applying species co-occurrence frameworks with fish assemblage data to identify species associations and sharpen ecological hypotheses. JOURNAL OF FISH BIOLOGY 2022; 100:339-351. [PMID: 33860934 DOI: 10.1111/jfb.14752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/09/2020] [Indexed: 06/12/2023]
Abstract
Different species can associate or interact in many ways, and methods exist for inferring associations and underlying mechanisms from incidence data (e.g., co-occurrence frameworks). These methods have received criticism despite their recent resurgence in the literature. However, co-occurrence frameworks for identifying nonrandomly associated species pairs (e.g., aggregated or segregated pairs) have value as heuristic tools for sharpening hypotheses concerning fish ecology. This paper provides a case study examining species co-occurrence across 33 stream fish assemblages in southeastern Oklahoma, USA, which were sampled twice (1974 and 2014). This study sought to determine (a) which species were nonrandomly associated, (b) what processes might have driven these associations and (c) how consistent patterns were across time. Associations among most pairs of species (24 species, 276 unique pairs) were not significantly different from random (>80%). Among all significant, nonrandomly associated species pairs (54 unique pairs), 78% (42 pairs) were aggregated and 22% (12 pairs) segregated. Most of these (28 pairs, 52%) were hypothesized to be driven by nonbiotic mechanisms: habitat filtering (20 pairs, 37%), dispersal limitation (two pairs, 0.4%) or both (six pairs, 11%). The remaining 26 nonrandomly associated pairs (48%) had no detectable signal of spatial or environmental factors involved with the association, therefore the potential for biotic interaction was not refuted. Only five species pairs were consistently associated across both sampling periods: stonerollers Campostoma spp. and orangebelly darter Etheostoma radiosum; red shiner Cyprinella lutrensis and bullhead minnow Pimephales vigilax; bluegill sunfish Lepomis macrochirus and redear sunfish Lepomis microlophus; redfin shiner Lythrurus umbratilis and bluntnose minnow Pimephales notatus; and bigeye shiner Notropis boops and golden shiner Notemigonus crysoleucas. Frameworks for identifying nonrandomly associated species pairs can provide insight into broader mechanisms of species assembly and point to potentially interesting species interactions (out of many possible pairs). However, this approach is best applied as a tool for sharpening hypotheses to be investigated further. Rather than a weakness, the heuristic nature is the strength of such methods, and can help guide biologists toward better questions by employing relatively cheap diversity survey data, which are often already in hand, to reduce complex interaction networks down to their nonstochastic parts which warrant further investigation.
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Affiliation(s)
- Zachery D Zbinden
- Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas, USA
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111
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Changes in Biomass and Diversity of Soil Macrofauna along a Climatic Gradient in European Boreal Forests. INSECTS 2022; 13:insects13010094. [PMID: 35055937 PMCID: PMC8779977 DOI: 10.3390/insects13010094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 01/10/2022] [Accepted: 01/11/2022] [Indexed: 02/04/2023]
Abstract
Simple Summary We used a 1000 km long latitudinal gradient in north-western Russia to study the potential impacts of a changing climate on soil invertebrates visible by a naked eye (insects, spiders, earthworms etc.). We extracted these animals from soil, weighed them and identified them to the species level. We found that the diversity of soil invertebrates decreased towards the north, whereas the latitudinal pattern in biomass depended on the animal’s feeding habit. The biomass of species feeding on live plant roots and fungal mycelia decreased towards the north, whereas the biomass of species feeding on dead plant tissues and live invertebrates showed no significant latitudinal changes. The discovery of this variation in latitudinal biomass patterns suggests that soil invertebrates from different feeding guilds may respond differently to climate change. As a result, the biomass ratio between consumers and their food resources (e.g., herbivores and plants, predators and prey) may change. We poorly understood how this change will affect the future structure and functions of boreal forest ecosystems. Abstract Latitudinal gradients allow insights into the factors that shape ecosystem structure and delimit ecosystem processes, particularly climate. We asked whether the biomass and diversity of soil macrofauna in boreal forests change systematically along a latitudinal gradient spanning from 60° N to 69° N. Invertebrates (3697 individuals) were extracted from 400 soil samples (20 × 20 cm, 30 cm depth) collected at ten sites in 2015–2016 and then weighed and identified. We discovered 265 species living in soil and on the soil surface; their average density was 0.486 g d·w·m−2. The species-level diversity decreased from low to high latitudes. The biomass of soil macrofauna showed no latitudinal changes in early summer but decreased towards the north in late summer. This variation among study sites was associated with the decrease in mean annual temperature by ca 5 °C and with variation in fine root biomass. The biomass of herbivores and fungivores decreased towards the north, whereas the biomass of detritivores and predators showed no significant latitudinal changes. This variation in latitudinal biomass patterns among the soil macrofauna feeding guilds suggests that these guilds may respond differently to climate change, with poorly understood consequences for ecosystem structure and functions.
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112
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Culumber ZW. Variation in behavioral traits across a broad latitudinal gradient in a livebearing fish. Evol Ecol 2022. [DOI: 10.1007/s10682-021-10146-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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113
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Zvereva EL, Zverev V, Kozlov MV. Insect herbivory increases from forest to alpine tundra in Arctic mountains. Ecol Evol 2022; 12:e8537. [PMID: 35127040 PMCID: PMC8796911 DOI: 10.1002/ece3.8537] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Revised: 11/22/2021] [Accepted: 12/22/2021] [Indexed: 11/07/2022] Open
Abstract
Current theory holds that the intensity of biotic interactions decreases with increases in latitude and elevation; however, empirical data demonstrate great variation in the direction, strength, and shape of elevational changes in herbivory. The latitudinal position of mountains may be one important source of this variation, but the acute shortage of data from polar mountains hampers exploration of latitude effects on elevational changes in herbivory. Here, we reduce this knowledge gap by exploring six elevation gradients located in three Arctic mountain ranges to test the prediction that a decrease in herbivory occurs with increasing elevation from forest to alpine tundra. Across the 10 most abundant evergreen and deciduous woody plant species, relative losses of foliage to insect herbivores were 2.2-fold greater at the highest elevations (alpine tundra) than in mid-elevation birch woodlands or low-elevation coniferous forests. Plant quality for herbivores (quantified by specific leaf area) significantly decreased with elevation across all studied species, indicating that bottom-up factors were unlikely to shape the observed pattern in herbivory. An experiment with open-top chambers established at different elevations showed that even a slight increase in ambient temperature enhances herbivory in Arctic mountains. Therefore, we suggest that the discovered increase in herbivory with elevation is explained by higher temperatures at the soil surface in open habitats above the tree line compared with forests at lower elevations. This explanation is supported by the significant difference in elevational changes in herbivory between low and tall plants: herbivory on low shrubs increased fourfold from forest to alpine sites, while herbivory on trees and tall shrubs did not change with elevation. We suggest that an increase in herbivory with an increase in elevation is typical for high-latitude mountains, where inverse temperature gradients, especially at the soil surface, are common. Verification of this hypothesis requires further studies of elevational patterns in herbivory at high latitudes.
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Affiliation(s)
| | - Vitali Zverev
- Department of BiologyUniversity of TurkuTurkuFinland
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114
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Hutchinson MC, Dobson AP, Pringle RM. Dietary abundance distributions: Dominance and diversity in vertebrate diets. Ecol Lett 2021; 25:992-1008. [PMID: 34967090 DOI: 10.1111/ele.13948] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/08/2021] [Accepted: 11/23/2021] [Indexed: 01/31/2023]
Abstract
Diet composition is among the most important yet least understood dimensions of animal ecology. Inspired by the study of species abundance distributions (SADs), we tested for generalities in the structure of vertebrate diets by characterising them as dietary abundance distributions (DADs). We compiled data on 1167 population-level diets, representing >500 species from six vertebrate classes, spanning all continents and oceans. DADs near-universally (92.5%) followed a hollow-curve shape, with scant support for other plausible rank-abundance-distribution shapes. This strong generality is inherently related to, yet incompletely explained by, the SADs of available food taxa. By quantifying dietary generalisation as the half-saturation point of the cumulative distribution of dietary abundance (sp50, minimum number of foods required to account for 50% of diet), we found that vertebrate populations are surprisingly specialised: in most populations, fewer than three foods accounted for at least half the diet. Variation in sp50 was strongly associated with consumer type, with carnivores being more specialised than herbivores or omnivores. Other methodological (sampling method and effort, taxonomic resolution), biological (body mass, frugivory) and biogeographic (latitude) factors influenced sp50 to varying degrees. Future challenges include identifying the mechanisms underpinning the hollow-curve DAD, its generality beyond vertebrates, and the biological determinants of dietary generalisation.
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Affiliation(s)
- Matthew C Hutchinson
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA.,Institute of Evolutionary Biology and Environmental Studies, Universität Zürich, Zürich, Switzerland
| | - Andrew P Dobson
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA
| | - Robert M Pringle
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA
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115
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Zhang Q, Ree RH, Salamin N, Xing Y, Silvestro D. Fossil-Informed Models Reveal a Boreotropical Origin and Divergent Evolutionary Trajectories in the Walnut Family (Juglandaceae). Syst Biol 2021; 71:242-258. [PMID: 33964165 PMCID: PMC8677545 DOI: 10.1093/sysbio/syab030] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 05/03/2021] [Accepted: 05/03/2021] [Indexed: 12/12/2022] Open
Abstract
Temperate woody plants in the Northern Hemisphere have long been known to exhibit high species richness in East Asia and North America and significantly lower diversity in Europe, but the causes of this pattern remain debated. Here, we quantify the roles of dispersal, niche evolution, and extinction in shaping the geographic diversity of the temperate woody plant family Juglandaceae (walnuts and their relatives). Integrating evidence from molecular, morphological, fossil, and (paleo)environmental data, we find strong support for a Boreotropical origin of the family with contrasting evolutionary trajectories between the temperate subfamily Juglandoideae and the tropical subfamily Engelhardioideae. Juglandoideae rapidly evolved frost tolerance when the global climate shifted to ice-house conditions from the Oligocene, with diversification at high latitudes especially in Europe and Asia during the Miocene. Subsequent range contraction at high latitudes and high levels of extinction in Europe driven by global cooling led to the current regional disparity in species diversity. Engelhardioideae showed temperature conservatism while adapting to increased humidity, tracking tropical climates to low latitudes since the middle Eocene with comparatively little diversification, perhaps due to high competition in the tropical zone. The biogeographic history of Juglandaceae shows that the North Atlantic land bridge and Europe played more critical roles than previously thought in linking the floras of East Asia and North America, and showcases the complex interplay among climate change, niche evolution, dispersal, and extinction that shaped the modern disjunct pattern of species richness in temperate woody plants. [Boreotropical origin; climatic niche evolution; disjunct distribution; dispersal; diversity anomaly; extinction; Juglandaceae.].
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Affiliation(s)
- Qiuyue Zhang
- Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 666303 Mengla, China
- Department of Biology, University of Fribourg, 1700 Fribourg, Switzerland
- Department of Computational Biology, University of Lausanne, 1015 Lausanne, Switzerland
- College of Resources and Environment, University of Chinese Academy of Sciences, 100049 Beijing, China
| | - Richard H Ree
- Life Sciences Section, Negaunee Integrative Research Center, Field Museum, Chicago, IL, 60605, USA
| | - Nicolas Salamin
- Department of Computational Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Yaowu Xing
- Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 666303 Mengla, China
- Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, 666303 Mengla, China
| | - Daniele Silvestro
- Department of Biology, University of Fribourg, 1700 Fribourg, Switzerland
- Swiss Institute of Bioinformatics, Quartier Sorge, 1015 Lausanne, Switzerland
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116
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Murray CM, McMahan CD, Litmer AR, Goessling JM, Siegel D. Latitudinal gradients in sexual dimorphism: Alternative hypotheses for variation in male traits. Ecol Evol 2021; 11:17519-17526. [PMID: 34938526 PMCID: PMC8668724 DOI: 10.1002/ece3.8386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/25/2021] [Accepted: 11/02/2021] [Indexed: 11/19/2022] Open
Abstract
Biological patterns across latitudinal gradients elucidate a number of striking natural clines from which numerous processes can be further explored. The trade-off between reproduction and somatic maintenance and growth represents a suite of life-history traits with variable energy allocation and potential latitudinal patterns. Specifically, male sexually dimorphic traits in female choice systems represent one such reproductive investment constrained by resource acquisition and subsequent allocation. Latitudinal variation in sexual dimorphism has been suggested although the relationship between dimorphic traits and latitude are conflicting. Here, we test alternative hypotheses regarding this pattern using two broadly distributed vertebrates exhibiting sexually dimorphic traits. We hypothesized that the exaggeration of dimorphic traits correlates with latitude, with males having exaggerated sexually dimorphic traits at either higher or lower latitudes. Results indicate that male sexually dimorphic traits are exaggerated at lower latitudes while relative gonopodium size in Poecilia latipinna was larger at higher latitudes. This pattern may be a result of lower latitude populations experiencing greater population densities and longer access to resources that could manifest in females more intensively selecting for higher quality males in lower latitudes. Experimental work should address this pattern and investigate mechanistic processes.
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Affiliation(s)
- Christopher M. Murray
- Department of Biological SciencesSoutheastern Louisiana UniversityHammondLouisinaUSA
| | | | | | | | - Dustin Siegel
- Department of BiologySoutheast Missouri State UniversityCape GirardeauMissouriUSA
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117
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Chesshire PR, McCabe LM, Cobb NS. Variation in Plant-Pollinator Network Structure along the Elevational Gradient of the San Francisco Peaks, Arizona. INSECTS 2021; 12:insects12121060. [PMID: 34940148 PMCID: PMC8704280 DOI: 10.3390/insects12121060] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 11/18/2021] [Accepted: 11/24/2021] [Indexed: 11/16/2022]
Abstract
The structural patterns comprising bimodal pollination networks can help characterize plant-pollinator systems and the interactions that influence species distribution and diversity over time and space. We compare network organization of three plant-pollinator communities along the altitudinal gradient of the San Francisco Peaks in northern Arizona. We found that pollination networks become more nested, as well as exhibit lower overall network specialization, with increasing elevation. Greater weight of generalist pollinators at higher elevations of the San Francisco Peaks may result in plant-pollinator communities less vulnerable to future species loss due to changing climate or shifts in species distribution. We uncover the critical, more generalized pollinator species likely responsible for higher nestedness and stability at the higher elevation environment. The generalist species most important for network stability may be of the greatest interest for conservation efforts; preservation of the most important links in plant-pollinator networks may help secure the more specialized pollinators and maintain species redundancy in the face of ecological change, such as changing climate.
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Affiliation(s)
- Paige R. Chesshire
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, USA
- Biodiversity Outreach Network (BON), Mesa, AZ 86011, USA;
- Correspondence:
| | | | - Neil S. Cobb
- Biodiversity Outreach Network (BON), Mesa, AZ 86011, USA;
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118
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Gougherty AV, Davies TJ. Host phylogenetic diversity predicts the global extent and composition of tree pests. Ecol Lett 2021; 25:101-112. [PMID: 34719086 DOI: 10.1111/ele.13908] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 03/10/2021] [Accepted: 09/15/2021] [Indexed: 10/19/2022]
Abstract
Tree pests cause billions of dollars of damage annually; yet, we know little about what limits their regional composition and distribution. Here, we model the co-occurrence of 4510 pests and 981 tree host genera spread across 233 countries. We show the composition of tree pests is primarily driven by the phylogenetic composition of host trees, whereas effects of climate and geography tend to be more minor. Pests that utilise many hosts tend to be more widespread; however, most pests do not fill the geographic range of their hosts-indicating that many pests could expand their extents if able to overcome barriers limiting their current distribution. Our results suggest that the establishment of pests in new regions may be largely dictated by the presence of suitable host trees, but more work is needed to fully understand the influences climate has on the distributions of individual pest species.
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Affiliation(s)
- Andrew V Gougherty
- Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada
| | - T Jonathan Davies
- Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada.,Department of Forest & Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada
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119
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Shay JE, Pennington LK, Mandussi Montiel-Molina JA, Toews DJ, Hendrickson BT, Sexton JP. Rules of Plant Species Ranges: Applications for Conservation Strategies. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.700962] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Earth is changing rapidly and so are many plant species’ ranges. Here, we synthesize eco-evolutionary patterns found in plant range studies and how knowledge of species ranges can inform our understanding of species conservation in the face of global change. We discuss whether general biogeographic “rules” are reliable and how they can be used to develop adaptive conservation strategies of native plant species across their ranges. Rules considered include (1) factors that set species range limits and promote range shifts; (2) the impact of biotic interactions on species range limits; (3) patterns of abundance and adaptive properties across species ranges; (4) patterns of gene flow and their implications for genetic rescue, and (5) the relationship between range size and conservation risk. We conclude by summarizing and evaluating potential species range rules to inform future conservation and management decisions. We also outline areas of research to better understand the adaptive capacity of plants under environmental change and the properties that govern species ranges. We advise conservationists to extend their work to specifically consider peripheral and novel populations, with a particular emphasis on small ranges. Finally, we call for a global effort to identify, synthesize, and analyze prevailing patterns or rules in ecology to help speed conservation efforts.
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120
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Daco L, Colling G, Matthies D. Altitude and latitude have different effects on population characteristics of the widespread plant Anthyllis vulneraria. Oecologia 2021; 197:537-549. [PMID: 34601636 PMCID: PMC8505396 DOI: 10.1007/s00442-021-05030-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 08/27/2021] [Indexed: 12/02/2022]
Abstract
Widespread plants may provide natural models for how population processes change with temperature and other environmental variables and how they may respond to global change. Similar changes in temperature can occur along altitudinal and latitudinal gradients, but hardly any study has compared the effects of the two types of gradients. We studied populations of Anthyllis vulneraria along a latitudinal gradient from Central Europe to the range limit in the North and an altitudinal gradient in the Alps from 500 m to the altitudinal limit at 2500 m, both encompassing a change in annual mean temperature of c. 11.5 °C. Plant size and reproduction decreased, but plant density increased along both gradients, indicating higher recruitment and demographic compensation among vital rates. Our results support the view that demographic compensation may be common in widespread species in contrast to the predictions of the abundant centre model of biogeography. Variation in temperature along the gradients had the strongest effects on most population characteristics, followed by that in precipitation, solar radiation, and soil nutrients. The proportion of plants flowering, seed set and seed mass declined with latitude, while the large variation in these traits along the altitudinal gradient was not related to elevation and covarying environmental variables like annual mean temperature. This suggests that it will be more difficult to draw conclusions about the potential impacts of future climate warming on plant populations in mountains, because of the importance of small-scale variation in environmental conditions.
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Affiliation(s)
- Laura Daco
- Department of Biology, University of Marburg, Karl-von-Frisch-Str. 8, 35043 Marburg, Germany
- Musée national d’histoire naturelle, 25 rue Münster, L-2160 Luxembourg, Luxembourg
- Fondation Faune-Flore, 24 rue Münster, L-2160 Luxembourg, Luxembourg
| | - Guy Colling
- Musée national d’histoire naturelle, 25 rue Münster, L-2160 Luxembourg, Luxembourg
| | - Diethart Matthies
- Department of Biology, University of Marburg, Karl-von-Frisch-Str. 8, 35043 Marburg, Germany
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121
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Bertić M, Schroeder H, Kersten B, Fladung M, Orgel F, Buegger F, Schnitzler JP, Ghirardo A. European oak chemical diversity - from ecotypes to herbivore resistance. THE NEW PHYTOLOGIST 2021; 232:818-834. [PMID: 34240433 DOI: 10.1111/nph.17608] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
Climate change is increasing insect pressure and forcing plants to adapt. Although chemotypic differentiation and phenotypic plasticity in spatially separated tree populations are known for decades, understanding their importance in herbivory resistance across forests remains challenging. We studied four oak forest stands in Germany using nontarget metabolomics, elemental analysis, and chemometrics and mapped the leaf metabolome of herbivore-resistant (T-) and herbivore-susceptible (S-) European oaks (Quercus robur) to Tortrix viridana, an oak pest that causes severe forest defoliation. Among the detected metabolites, we identified reliable metabolic biomarkers to distinguish S- and T-oak trees. Chemotypic differentiation resulted in metabolic shifts of primary and secondary leaf metabolism. Across forests, T-oaks allocate resources towards constitutive chemical defense enriched of polyphenolic compounds, e.g. the flavonoids kaempferol, kaempferol and quercetin glucosides, while S-oaks towards growth-promoting substances such as carbohydrates and amino-acid derivatives. This extensive work across natural forests shows that oaks' resistance and susceptibility to herbivory are linked to growth-defense trade-offs of leaf metabolism. The discovery of biomarkers and the developed predictive model pave the way to understand Quercus robur's susceptibility to herbivore attack and to support forest management, contributing to the preservation of oak forests in Europe.
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Affiliation(s)
- Marko Bertić
- Research Unit Environmental Simulation (EUS), Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Hilke Schroeder
- Thünen-Institute of Forest Genetics, Sieker Landstrasse 2, 22927, Grosshansdorf, Germany
| | - Birgit Kersten
- Thünen-Institute of Forest Genetics, Sieker Landstrasse 2, 22927, Grosshansdorf, Germany
| | - Matthias Fladung
- Thünen-Institute of Forest Genetics, Sieker Landstrasse 2, 22927, Grosshansdorf, Germany
| | - Franziska Orgel
- Thünen-Institute of Forest Genetics, Sieker Landstrasse 2, 22927, Grosshansdorf, Germany
| | - Franz Buegger
- Institute of Biochemical Plant Pathology (BIOP), Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Jörg-Peter Schnitzler
- Research Unit Environmental Simulation (EUS), Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Andrea Ghirardo
- Research Unit Environmental Simulation (EUS), Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
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122
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Johnson PT, Haas SE. Why do parasites exhibit reverse latitudinal diversity gradients? Testing the roles of host diversity, habitat and climate. GLOBAL ECOLOGY AND BIOGEOGRAPHY : A JOURNAL OF MACROECOLOGY 2021; 30:1810-1821. [PMID: 34539245 PMCID: PMC8447859 DOI: 10.1111/geb.13347] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 05/24/2021] [Indexed: 06/13/2023]
Abstract
AIM The latitudinal diversity gradient (LDG) - in which species richness decreases from the equator toward the poles - is among the most fundamental distributional patterns in ecology. Despite the expectation that the diversity of parasites tracks that of their hosts, available evidence suggests that many parasites exhibit reverse latitudinal gradients or no pattern, yet the rarity of large-scale datasets on host-parasite interactions calls into question the robustness of such trends. Here, we collected parasitological data from a host group of conservation importance - lentic-breeding amphibians - to characterize the form and direction of relationships among latitude, parasite richness, and parasite load. LOCATION The contiguous USA. TIME PERIOD 2000 to 2014. MAJOR TAXA STUDIED Lentic-breeding frogs and toads and their helminth parasites. METHODS We collected information on parasite richness and infection load for 846 amphibian populations representing 31 species. We combined these data with environmental and biological data to test for LDGs and potential mechanisms. RESULTS Both parasite richness and abundance increased across 20 degrees of latitude - a reverse LDG. For parasite richness, this pattern was partially explained by latitudinal increases in wetland area, landcover diversity, and the richness of waterbirds - which function as definitive hosts for many amphibian parasites. Host body size also correlated positively with latitude and helminth richness, potentially reflecting increased habitat availability, greater host longevity, or a persistent phylogenetic signal. Parasite abundance associated positively with wetland area and landcover diversity, but negatively with amphibian taxonomic richness. Longitude exhibited non-linear relationships with parasite abundance and richness, which we suggest stem from large-scale variation in host availability (e.g., migratory bird flyways). MAIN CONCLUSIONS With growing interest in the distribution of parasites and pathogens, these results highlight the importance of inverse latitudinal gradients while emphasizing the explanatory influence of host body size, habitat availability, and host diversity.
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Affiliation(s)
| | - Sarah E. Haas
- Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, USA
- Current address: Texas Parks & Wildlife Department, Inland Fisheries Division, Austin, TX, USA
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123
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Yamawo A, Suzuki N, Tagawa J. Species diversity and biological trait function: Effectiveness of ant–plant mutualism decreases as ant species diversity increases. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Akira Yamawo
- Department of Applied Biological Sciences Faculty of Agriculture Saga University Saga Japan
| | - Nobuhiko Suzuki
- Department of Applied Biological Sciences Faculty of Agriculture Saga University Saga Japan
| | - Jun Tagawa
- Department of Biosphere–Geosphere System Science Faculty of Informatics Okayama University of Science Okayama Japan
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124
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Paquette A, Hargreaves AL. Biotic interactions are more often important at species' warm versus cool range edges. Ecol Lett 2021; 24:2427-2438. [PMID: 34453406 DOI: 10.1111/ele.13864] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 07/27/2021] [Accepted: 07/29/2021] [Indexed: 12/11/2022]
Abstract
Predicting which ecological factors constrain species distributions is a fundamental ecological question and critical to forecasting geographic responses to global change. Darwin hypothesised that abiotic factors generally impose species' high-latitude and high-elevation (typically cool) range limits, whereas biotic interactions more often impose species' low-latitude/low-elevation (typically warm) limits, but empirical support has been mixed. Here, we clarify three predictions arising from Darwin's hypothesis and show that previously mixed support is partially due to researchers testing different predictions. Using a comprehensive literature review (885 range limits), we find that biotic interactions, including competition, predation and parasitism, contributed to >60% of range limits and influenced species' warm limits more often than cool limits. Abiotic factors contributed more often than biotic interactions to cool range limits, but temperature contributed frequently to both cool and warm limits. Our results suggest that most range limits will be sensitive to climate warming, but warm-limit responses in particular will depend strongly on biotic interactions.
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125
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Arbuckle K, Harris RJ. Radiating pain: venom has contributed to the diversification of the largest radiations of vertebrate and invertebrate animals. BMC Ecol Evol 2021; 21:150. [PMID: 34344322 PMCID: PMC8336261 DOI: 10.1186/s12862-021-01880-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 07/09/2021] [Indexed: 01/04/2023] Open
Abstract
Background Understanding drivers of animal biodiversity has been a longstanding aim in evolutionary biology. Insects and fishes represent the largest lineages of invertebrates and vertebrates respectively, and consequently many ideas have been proposed to explain this diversity. Natural enemy interactions are often important in diversification dynamics, and key traits that mediate such interactions may therefore have an important role in explaining organismal diversity. Venom is one such trait which is intricately bound in antagonistic coevolution and has recently been shown to be associated with increased diversification rates in tetrapods. Despite ~ 10% of fish families and ~ 16% of insect families containing venomous species, the role that venom may play in these two superradiations remains unknown. Results In this paper we take a broad family-level phylogenetic perspective and show that variation in diversification rates are the main cause of variations in species richness in both insects and fishes, and that venomous families have diversification rates twice as high as non-venomous families. Furthermore, we estimate that venom was present in ~ 10% and ~ 14% of the evolutionary history of fishes and insects respectively. Conclusions Consequently, we provide evidence that venom has played a role in generating the remarkable diversity in the largest vertebrate and invertebrate radiations. Supplementary Information The online version contains supplementary material available at 10.1186/s12862-021-01880-z.
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Affiliation(s)
- Kevin Arbuckle
- Department of Biosciences, College of Science, Swansea University, Swansea, SA2 8PP, UK.
| | - Richard J Harris
- Venom Evolution Lab, School of Biological Sciences, University of Queensland, Saint Lucia, QLD, 4072, Australia
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126
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Drury JP, Clavel J, Tobias JA, Rolland J, Sheard C, Morlon H. Tempo and mode of morphological evolution are decoupled from latitude in birds. PLoS Biol 2021; 19:e3001270. [PMID: 34428214 PMCID: PMC8384433 DOI: 10.1371/journal.pbio.3001270] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 05/07/2021] [Indexed: 12/17/2022] Open
Abstract
The latitudinal diversity gradient is one of the most striking patterns in nature, yet its implications for morphological evolution are poorly understood. In particular, it has been proposed that an increased intensity of species interactions in tropical biota may either promote or constrain trait evolution, but which of these outcomes predominates remains uncertain. Here, we develop tools for fitting phylogenetic models of phenotypic evolution in which the impact of species interactions-namely, competition-can vary across lineages. Deploying these models on a global avian trait dataset to explore differences in trait divergence between tropical and temperate lineages, we find that the effect of latitude on the mode and tempo of morphological evolution is weak and clade- or trait dependent. Our results indicate that species interactions do not disproportionately impact morphological evolution in tropical bird families and question the validity of previously reported patterns of slower trait evolution in the tropics.
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Affiliation(s)
- Jonathan P. Drury
- Department of Biosciences, Durham University, Durham, United Kingdom
| | - Julien Clavel
- Natural History Museum, London, United Kingdom
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023, LEHNA, Villeurbanne, France
| | - Joseph A. Tobias
- Department of Life Sciences, Imperial College London, Ascot, United Kingdom
| | - Jonathan Rolland
- Zoology Department, University of British Columbia, Vancouver, Canada
| | - Catherine Sheard
- School of Earth Sciences, University of Bristol, Bristol, United Kingdom
| | - Hélène Morlon
- Institut de Biologie, École Normale Supérieure, CNRS UMR 8197, Paris, France
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127
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Gao L, Wei C, Xu H, Liu X, Siemann E, Lu X. Latitudinal variation in the diversity and composition of various organisms associated with an exotic plant: the role of climate and plant invasion. THE NEW PHYTOLOGIST 2021; 231:1559-1569. [PMID: 34018617 DOI: 10.1111/nph.17479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 05/11/2021] [Indexed: 06/12/2023]
Abstract
Climate and plant invasion can shape biotic communities at large spatial scales. Yet, how diverse groups of organisms associated with an invasive plant change simultaneously with latitude and the roles of climate and plant invasion remains unclear. We conducted a field survey of plants (native vs exotic), soil fungi (pathogenic, saprotrophic, arbuscular mycorrhiza fungi (AMF) and ectomycorrhizal (EcM) fungi) and arthropods (herbivores, predators and detritivores) associated with the invasive plant Alternanthera philoxeroides at 49 sites spanning 14 latitudinal degrees in China. Results showed that diversity and composition of these functional groups changed differently with latitude, partially due to their specific responses to climate, invasion of A. philoxeroides and other biotic environments. Moreover, A. philoxeroides invasion and/or composition of other plants, rather than climate, predicted the diversity and richness of major functional groups and partly explained variance in composition of putative fungal pathogens. Our results suggest that climate and plant invasion could affect the diversity and composition of diverse groups of organisms simultaneously and their relative importance might vary among functional groups. Thus, it is necessary to explore latitudinal patterns and underlying drivers of diverse groups of organisms simultaneously to improve our ability to predict and mitigate threats posed by plant invasion and climate change.
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Affiliation(s)
- Lunlun Gao
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Hubei, 430070, China
- Institute of Invasion Biology, Agriculture & Ecological Safety, Huazhong Agricultural University, Hubei, 430070, China
- College of Plant Sciences & Technology, Huazhong Agricultural University, Hubei, 430070, China
| | - Chunqiang Wei
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Hubei, 430070, China
- School of Life Sciences, Central China Normal University, Hubei, 430079, China
- Guangxi Institute of Botany, Chinese Academy of Sciences, Guilin, Guangxi, 541006, China
| | - Hao Xu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Hubei, 430070, China
- Institute of Invasion Biology, Agriculture & Ecological Safety, Huazhong Agricultural University, Hubei, 430070, China
- College of Plant Sciences & Technology, Huazhong Agricultural University, Hubei, 430070, China
| | - Xiaoyan Liu
- Institute of Invasion Biology, Agriculture & Ecological Safety, Huazhong Agricultural University, Hubei, 430070, China
- College of Plant Sciences & Technology, Huazhong Agricultural University, Hubei, 430070, China
| | - Evan Siemann
- Biosciences Department, Rice University, Houston, TX, 77005, USA
| | - Xinmin Lu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Hubei, 430070, China
- Institute of Invasion Biology, Agriculture & Ecological Safety, Huazhong Agricultural University, Hubei, 430070, China
- College of Plant Sciences & Technology, Huazhong Agricultural University, Hubei, 430070, China
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128
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López-Goldar X, Agrawal AA. Ecological Interactions, Environmental Gradients, and Gene Flow in Local Adaptation. TRENDS IN PLANT SCIENCE 2021; 26:796-809. [PMID: 33865704 DOI: 10.1016/j.tplants.2021.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 03/02/2021] [Accepted: 03/16/2021] [Indexed: 06/12/2023]
Abstract
Despite long-standing interest in local adaptation of plants to their biotic and abiotic environment, existing theory, and many case studies, little work to date has addressed within-species evolution of concerted strategies and how these might contrast with patterns across species. Here we consider the interactions between pollinators, herbivores, and resource availability in shaping plant local adaptation, how these interactions impact plant phenotypes and gene flow, and the conditions where multiple traits align along major environmental gradients such as latitude and elevation. Continued work in emerging model systems will benefit from the melding of classic experimental approaches with novel population genetic analyses to reveal patterns and processes in plant local adaptation.
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Affiliation(s)
- Xosé López-Goldar
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA.
| | - Anurag A Agrawal
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA
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129
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Zvereva EL, Kozlov MV. Latitudinal gradient in the intensity of biotic interactions in terrestrial ecosystems: Sources of variation and differences from the diversity gradient revealed by meta-analysis. Ecol Lett 2021; 24:2506-2520. [PMID: 34322961 DOI: 10.1111/ele.13851] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 06/09/2021] [Accepted: 06/14/2021] [Indexed: 01/19/2023]
Abstract
The Latitudinal Biotic Interaction Hypothesis (LBIH) states that the intensity of biotic interactions increases from high to low latitudes. This hypothesis, which may partly explain latitudinal gradients in biodiversity, remains hotly debated, largely due to variable outcomes of published studies. We used meta-analysis to identify the scope of the LBIH in terrestrial ecosystems. For this purpose, we explored the sources of variation in the strength of latitudinal changes in herbivory, carnivory and parasitism (119 publications) and compared these gradients with gradients in the diversity of the respective groups of animals (102 publications). Overall, both herbivory and carnivory decreased towards the poles, while parasitism increased. The latitudinal gradient in herbivory and carnivory was threefold stronger above 50-60° than at lower latitudes and was significant due to interactions involving ectothermic consumers, studies using standardised prey (i.e. prey lacking local anti-predator adaptations) and studies aimed at testing LBIH. The poleward decrease in biodiversity did not differ between ectothermic and endothermic animals or among climate zones and was fourfold stronger than decrease in herbivory and carnivory. The discovered differences between the gradients in biotic interactions and biodiversity suggest that these two global macroecological patterns are likely shaped by different factors.
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130
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Freestone AL, Torchin ME, Jurgens LJ, Bonfim M, López DP, Repetto MF, Schlöder C, Sewall BJ, Ruiz GM. Stronger predation intensity and impact on prey communities in the tropics. Ecology 2021; 102:e03428. [PMID: 34105781 DOI: 10.1002/ecy.3428] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 12/21/2020] [Accepted: 02/05/2021] [Indexed: 11/06/2022]
Abstract
The hypothesis that biotic interactions strengthen toward lower latitudes provides a framework for linking community-scale processes with the macroecological scales that define our biosphere. Despite the importance of this hypothesis for understanding community assembly and ecosystem functioning, the extent to which interaction strength varies across latitude and the effects of this variation on natural communities remain unresolved. Predation in particular is central to ecological and evolutionary dynamics across the globe, yet very few studies explore both community-scale causes and outcomes of predation across latitude. Here we expand beyond prior studies to examine two important components of predation strength: intensity of predation (including multiple dimensions of the predator guild) and impact on prey community biomass and structure, providing one of the most comprehensive examinations of predator-prey interactions across latitude. Using standardized experiments, we tested the hypothesis that predation intensity and impact on prey communities were stronger at lower latitudes. We further assessed prey recruitment to evaluate the potential for this process to mediate predation effects. We used sessile marine invertebrate communities and their fish predators in nearshore environments as a model system, with experiments conducted at 12 sites in four regions spanning the tropics to the subarctic. Our results show clear support for an increase in both predation intensity and impact at lower relative to higher latitudes. The predator guild was more diverse at low latitudes, with higher predation rates, longer interaction durations, and larger predator body sizes, suggesting stronger predation intensity in the tropics. Predation also reduced prey biomass and altered prey composition at low latitudes, with no effects at high latitudes. Although recruitment rates were up to three orders of magnitude higher in the tropics than the subarctic, prey replacement through this process was insufficient to dampen completely the strong impacts of predators in the tropics. Our study provides a novel perspective on the biotic interaction hypothesis, suggesting that multiple components of the predator community likely contribute to predation intensity at low latitudes, with important consequences for the structure of prey communities.
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Affiliation(s)
- Amy L Freestone
- Department of Biology, Temple University, Philadelphia, Pennsylvania, 19122, USA.,Smithsonian Environmental Research Center, Edgewater, Maryland, 21037-0028, USA.,Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Ancon, Panama
| | - Mark E Torchin
- Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Ancon, Panama
| | - Laura J Jurgens
- Department of Biology, Temple University, Philadelphia, Pennsylvania, 19122, USA.,Smithsonian Environmental Research Center, Edgewater, Maryland, 21037-0028, USA.,Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Ancon, Panama
| | - Mariana Bonfim
- Department of Biology, Temple University, Philadelphia, Pennsylvania, 19122, USA
| | - Diana P López
- Department of Biology, Temple University, Philadelphia, Pennsylvania, 19122, USA
| | - Michele F Repetto
- Department of Biology, Temple University, Philadelphia, Pennsylvania, 19122, USA
| | - Carmen Schlöder
- Smithsonian Tropical Research Institute, Apartado, 0843-03092, Balboa, Ancon, Panama
| | - Brent J Sewall
- Department of Biology, Temple University, Philadelphia, Pennsylvania, 19122, USA
| | - Gregory M Ruiz
- Smithsonian Environmental Research Center, Edgewater, Maryland, 21037-0028, USA
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131
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Nuñez MA, Chiuffo MC, Pauchard A, Zenni RD. Making ecology really global. Trends Ecol Evol 2021; 36:766-769. [PMID: 34256986 DOI: 10.1016/j.tree.2021.06.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/07/2021] [Accepted: 06/09/2021] [Indexed: 02/01/2023]
Abstract
Ecology must flourish globally, especially in a period of unprecedented anthropogenic global change. However, some regions dominate the ecological literature. Multiple barriers prevent global production and exchange of ecological knowledge. The first step towards solutions is acknowledging and diagnosing this inequality and embracing our geographical and cultural diversity.
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Affiliation(s)
- Martin A Nuñez
- Grupo de Ecología de Invasiones, INIBIOMA, CONICET, Universidad Nacional del Comahue, Quintral 1250, San Carlos de Bariloche, CP 8400, Argentina; Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, USA.
| | - Mariana C Chiuffo
- Grupo de Ecología de Invasiones, INIBIOMA, CONICET, Universidad Nacional del Comahue, Quintral 1250, San Carlos de Bariloche, CP 8400, Argentina
| | - Aníbal Pauchard
- Laboratorio de Invasiones Biológicas (LIB), Facultad de Ciencias Forestales, Universidad de Concepción, Concepción, Chile; Institute of Ecology and Biodiversity (IEB), Santiago, Chile
| | - Rafael D Zenni
- Departamento de Ecologia e Conservação, Instituto de Ciências Naturais, Universidade Federal de Lavras, Lavras, Brazil
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132
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Furness EN, Garwood RJ, Mannion PD, Sutton MD. Productivity, niche availability, species richness, and extinction risk: Untangling relationships using individual-based simulations. Ecol Evol 2021; 11:8923-8940. [PMID: 34257936 PMCID: PMC8258231 DOI: 10.1002/ece3.7730] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 05/11/2021] [Indexed: 11/18/2022] Open
Abstract
It has often been suggested that the productivity of an ecosystem affects the number of species that it can support. Despite decades of study, the nature, extent, and underlying mechanisms of this relationship are unclear. One suggested mechanism is the "more individuals" hypothesis (MIH). This proposes that productivity controls the number of individuals in the ecosystem, and that more individuals can be divided into a greater number of species before their population size is sufficiently small for each to be at substantial risk of extinction. Here, we test this hypothesis using REvoSim: an individual-based eco-evolutionary system that simulates the evolution and speciation of populations over geological time, allowing phenomena occurring over timescales that cannot be easily observed in the real world to be evaluated. The individual-based nature of this system allows us to remove assumptions about the nature of speciation and extinction that previous models have had to make. Many of the predictions of the MIH are supported in our simulations: Rare species are more likely to undergo extinction than common species, and species richness scales with productivity. However, we also find support for relationships that contradict the predictions of the strict MIH: species population size scales with productivity, and species extinction risk is better predicted by relative than absolute species population size, apparently due to increased competition when total community abundance is higher. Furthermore, we show that the scaling of species richness with productivity depends upon the ability of species to partition niche space. Consequently, we suggest that the MIH is applicable only to ecosystems in which niche partitioning has not been halted by species saturation. Some hypotheses regarding patterns of biodiversity implicitly or explicitly overlook niche theory in favor of neutral explanations, as has historically been the case with the MIH. Our simulations demonstrate that niche theory exerts a control on the applicability of the MIH and thus needs to be accounted for in macroecology.
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Affiliation(s)
- Euan N. Furness
- Department of Earth Sciences and EngineeringImperial College LondonLondonUK
- Grantham InstituteImperial College LondonLondonUK
| | - Russell J. Garwood
- Department of Earth and Environmental SciencesUniversity of ManchesterManchesterUK
- Earth Sciences DepartmentNatural History MuseumLondonUK
| | | | - Mark D. Sutton
- Department of Earth Sciences and EngineeringImperial College LondonLondonUK
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133
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Hagen O, Flück B, Fopp F, Cabral JS, Hartig F, Pontarp M, Rangel TF, Pellissier L. gen3sis: A general engine for eco-evolutionary simulations of the processes that shape Earth's biodiversity. PLoS Biol 2021; 19:e3001340. [PMID: 34252071 PMCID: PMC8384074 DOI: 10.1371/journal.pbio.3001340] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 07/22/2021] [Accepted: 06/23/2021] [Indexed: 11/21/2022] Open
Abstract
Understanding the origins of biodiversity has been an aspiration since the days of early naturalists. The immense complexity of ecological, evolutionary, and spatial processes, however, has made this goal elusive to this day. Computer models serve progress in many scientific fields, but in the fields of macroecology and macroevolution, eco-evolutionary models are comparatively less developed. We present a general, spatially explicit, eco-evolutionary engine with a modular implementation that enables the modeling of multiple macroecological and macroevolutionary processes and feedbacks across representative spatiotemporally dynamic landscapes. Modeled processes can include species' abiotic tolerances, biotic interactions, dispersal, speciation, and evolution of ecological traits. Commonly observed biodiversity patterns, such as α, β, and γ diversity, species ranges, ecological traits, and phylogenies, emerge as simulations proceed. As an illustration, we examine alternative hypotheses expected to have shaped the latitudinal diversity gradient (LDG) during the Earth's Cenozoic era. Our exploratory simulations simultaneously produce multiple realistic biodiversity patterns, such as the LDG, current species richness, and range size frequencies, as well as phylogenetic metrics. The model engine is open source and available as an R package, enabling future exploration of various landscapes and biological processes, while outputs can be linked with a variety of empirical biodiversity patterns. This work represents a key toward a numeric, interdisciplinary, and mechanistic understanding of the physical and biological processes that shape Earth's biodiversity.
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Affiliation(s)
- Oskar Hagen
- Landscape Ecology, Institute of Terrestrial Ecosystems, Department of
Environmental Systems Science, ETH Zürich, Zürich, Switzerland
- Land Change Science Research Unit, Swiss Federal Institute for Forest,
Snow and Landscape Research, WSL, Birmensdorf, Switzerland
| | - Benjamin Flück
- Landscape Ecology, Institute of Terrestrial Ecosystems, Department of
Environmental Systems Science, ETH Zürich, Zürich, Switzerland
- Land Change Science Research Unit, Swiss Federal Institute for Forest,
Snow and Landscape Research, WSL, Birmensdorf, Switzerland
| | - Fabian Fopp
- Landscape Ecology, Institute of Terrestrial Ecosystems, Department of
Environmental Systems Science, ETH Zürich, Zürich, Switzerland
- Land Change Science Research Unit, Swiss Federal Institute for Forest,
Snow and Landscape Research, WSL, Birmensdorf, Switzerland
| | - Juliano S. Cabral
- Ecosystem Modeling, Center for Computational and Theoretical Biology,
University of Würzburg, Würzburg, Germany
| | - Florian Hartig
- Theoretical Ecology, University of Regensburg, Regensburg,
Germany
| | | | - Thiago F. Rangel
- Department of Ecology, Institute of Biological Sciences, Federal
University of Goiás, Goiânia, Brazil
| | - Loïc Pellissier
- Landscape Ecology, Institute of Terrestrial Ecosystems, Department of
Environmental Systems Science, ETH Zürich, Zürich, Switzerland
- Land Change Science Research Unit, Swiss Federal Institute for Forest,
Snow and Landscape Research, WSL, Birmensdorf, Switzerland
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134
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Díaz M, Grim T, Markó G, Morelli F, Ibáñez-Alamo JD, Jokimäki J, Kaisanlahti-Jokimäki ML, Tätte K, Tryjanowski P, Møller AP. Effects of climate variation on bird escape distances modulate community responses to global change. Sci Rep 2021; 11:12826. [PMID: 34145317 PMCID: PMC8213824 DOI: 10.1038/s41598-021-92273-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 06/01/2021] [Indexed: 11/13/2022] Open
Abstract
Climate and land use are rapidly changing environmental conditions. Behavioral responses to such global perturbations can be used to incorporate interspecific interactions into predictive models of population responses to global change. Flight initiation distance (FID) reflects antipredator behaviour defined as the distance at which an individual takes flight when approached by a human, under standardized conditions. This behavioural trait results from a balance between disturbance, predation risk, food availability and physiological needs, and it is related to geographical range and population trends in European birds. Using 32,145 records of flight initiation distances for 229 bird species during 2006–2019 in 24 European localities, we show that FIDs decreased with increasing temperature and precipitation, as expected if foraging success decreased under warm and humid conditions. Trends were further altered by latitude, urbanisation and body mass, as expected if climate effects on FIDs were mediated by food abundance and need, differing according to position in food webs, supporting foraging models. This provides evidence for a role of behavioural responses within food webs on how bird populations and communities are affected by global change.
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Affiliation(s)
- M Díaz
- Department of Biogeography and Global Change, Museo Nacional de Ciencias Naturales (BGC-MNCN-CSIC), c/Serrano 115bis, 28006, Madrid, Spain.
| | - T Grim
- Department of Zoology and Laboratory of Ornithology, Palacky University, 77146, Olomouc, Czech Republic
| | - G Markó
- Behavioral Ecology Group, Department of Systematics, Zoology and Ecology, Eötvös Loránd University, Pázmány Péter sétány 1/c, 1117, Budapest, Hungary.,Department of Plant Pathology, Institute of Plant Protection, Hungarian University of Agriculture and Life Sciences, Ménesi út 44, 1118, Budapest, Hungary
| | - F Morelli
- Faculty of Environmental Sciences, Community Ecology and Conservation, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic
| | - J D Ibáñez-Alamo
- Department of Zoology, Faculty of Sciences, University of Granada, 18071, Granada, Spain
| | - J Jokimäki
- Nature Inventory and EIA-Services, Arctic Centre, University of Lapland, P. O. Box 122, 96101, Rovaniemi, Finland
| | - M-L Kaisanlahti-Jokimäki
- Nature Inventory and EIA-Services, Arctic Centre, University of Lapland, P. O. Box 122, 96101, Rovaniemi, Finland
| | - K Tätte
- Department of Zoology, Institute of Ecology and Earth Sciences, University of Tartu, 19 51014, Tartu, Estonia
| | - P Tryjanowski
- Institute of Zoology, Poznań University of Life Sciences, Wojska Polskiego 71C, 60625, Poznań, Poland
| | - A P Møller
- Ecologie Systématique et Evolution, Université Paris-Saclay, CNRS, AgroParisTech, 91405, Orsay, France
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135
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Kikuchi DW, Herberstein ME, Barfield M, Holt RD, Mappes J. Why aren't warning signals everywhere? On the prevalence of aposematism and mimicry in communities. Biol Rev Camb Philos Soc 2021; 96:2446-2460. [PMID: 34128583 DOI: 10.1111/brv.12760] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 05/27/2021] [Accepted: 06/01/2021] [Indexed: 11/29/2022]
Abstract
Warning signals are a striking example of natural selection present in almost every ecological community - from Nordic meadows to tropical rainforests, defended prey species and their mimics ward off potential predators before they attack. Yet despite the wide distribution of warning signals, they are relatively scarce as a proportion of the total prey available, and more so in some biomes than others. Classically, warning signals are thought to be governed by positive density-dependent selection, i.e. they succeed better when they are more common. Therefore, after surmounting this initial barrier to their evolution, it is puzzling that they remain uncommon on the scale of the community. Here, we explore factors likely to determine the prevalence of warning signals in prey assemblages. These factors include the nature of prey defences and any constraints upon them, the behavioural interactions of predators with different prey defences, the numerical responses of predators governed by movement and reproduction, the diversity and abundance of undefended alternative prey and Batesian mimics in the community, and variability in other ecological circumstances. We also discuss the macroevolution of warning signals. Our review finds that we have a basic understanding of how many species in some taxonomic groups have warning signals, but very little information on the interrelationships among population abundances across prey communities, the diversity of signal phenotypes, and prey defences. We also have detailed knowledge of how a few generalist predator species forage in artificial laboratory environments, but we know much less about how predators forage in complex natural communities with variable prey defences. We describe how empirical work to address each of these knowledge gaps can test specific hypotheses for why warning signals exhibit their particular patterns of distribution. This will help us to understand how behavioural interactions shape ecological communities.
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Affiliation(s)
- David W Kikuchi
- Wissenschaftskolleg zu Berlin, Wallotstraße 19, Berlin, Germany.,Evolutionary Biology, Universität Bielefeld, Konsequez 45, Bielefeld, 33615, Germany
| | - Marie E Herberstein
- Wissenschaftskolleg zu Berlin, Wallotstraße 19, Berlin, Germany.,Department of Biological Sciences, Macquarie University, North Ryde, New South Wales, 2109, Australia
| | - Michael Barfield
- Department of Biology, University of Florida, Gainesville, FL, 32611-8525, U.S.A
| | - Robert D Holt
- Department of Biology, University of Florida, Gainesville, FL, 32611-8525, U.S.A
| | - Johanna Mappes
- Wissenschaftskolleg zu Berlin, Wallotstraße 19, Berlin, Germany.,Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Helsinki University, Helsinki, Finland.,Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, FI-40014, Finland
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136
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Villeneuve AR, Komoroske LM, Cheng BS. Diminished warming tolerance and plasticity in low-latitude populations of a marine gastropod. CONSERVATION PHYSIOLOGY 2021; 9:coab039. [PMID: 34136259 PMCID: PMC8201192 DOI: 10.1093/conphys/coab039] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 02/08/2021] [Accepted: 05/13/2021] [Indexed: 05/25/2023]
Abstract
Models of species response to climate change often assume that physiological traits are invariant across populations. Neglecting potential intraspecific variation may overlook the possibility that some populations are more resilient or susceptible than others, creating inaccurate predictions of climate impacts. In addition, phenotypic plasticity can contribute to trait variation and may mediate sensitivity to climate. Quantifying such forms of intraspecific variation can improve our understanding of how climate can affect ecologically important species, such as invasive predators. Here, we quantified thermal performance (tolerance, acclimation capacity, developmental traits) across seven populations of the predatory marine snail (Urosalpinx cinerea) from native Atlantic and non-native Pacific coast populations in the USA. Using common garden experiments, we assessed the effects of source population and developmental acclimation on thermal tolerance and developmental traits of F1 snails. We then estimated climate sensitivity by calculating warming tolerance (thermal tolerance - habitat temperature), using field environmental data. We report that low-latitude populations had greater thermal tolerance than their high latitude counterparts. However, these same low-latitude populations exhibited decreased thermal tolerance when exposed to environmentally realistic higher acclimation temperatures. Low-latitude native populations had the greatest climate sensitivity (habitat temperatures near thermal limits). In contrast, invasive Pacific snails had the lowest climate sensitivity, suggesting that these populations are likely to persist and drive negative impacts on native biodiversity. Developmental rate significantly increased in embryos sourced from populations with greater habitat temperature but had variable effects on clutch size and hatching success. Thus, warming can produce widely divergent responses within the same species, resulting in enhanced impacts in the non-native range and extirpation in the native range. Broadly, our results highlight how intraspecific variation can alter management decisions, as this may clarify whether management efforts should be focused on many or only a few populations.
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Affiliation(s)
- Andrew R Villeneuve
- Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, MA 01003, USA
- Gloucester Marine Station, University of Massachusetts Amherst, Gloucester, MA 01930, USA
| | - Lisa M Komoroske
- Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, MA 01003, USA
- Gloucester Marine Station, University of Massachusetts Amherst, Gloucester, MA 01930, USA
| | - Brian S Cheng
- Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, MA 01003, USA
- Gloucester Marine Station, University of Massachusetts Amherst, Gloucester, MA 01930, USA
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137
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Peralta-Maraver I, Stubbington R, Arnon S, Kratina P, Krause S, de Mello Cionek V, Leite NK, da Silva ALL, Thomaz SM, Posselt M, Milner VS, Momblanch A, Moretti MS, Nóbrega RLB, Perkins DM, Petrucio MM, Reche I, Saito V, Sarmento H, Strange E, Taniwaki RH, White J, Alves GHZ, Robertson AL. The riverine bioreactor: An integrative perspective on biological decomposition of organic matter across riverine habitats. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 772:145494. [PMID: 33581537 DOI: 10.1016/j.scitotenv.2021.145494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/21/2021] [Accepted: 01/25/2021] [Indexed: 06/12/2023]
Abstract
Riverine ecosystems can be conceptualized as 'bioreactors' (the riverine bioreactor) which retain and decompose a wide range of organic substrates. The metabolic performance of the riverine bioreactor is linked to their community structure, the efficiency of energy transfer along food chains, and complex interactions among biotic and abiotic environmental factors. However, our understanding of the mechanistic functioning and capacity of the riverine bioreactor remains limited. We review the state of knowledge and outline major gaps in the understanding of biotic drivers of organic matter decomposition processes that occur in riverine ecosystems, across habitats, temporal dimensions, and latitudes influenced by climate change. We propose a novel, integrative analytical perspective to assess and predict decomposition processes in riverine ecosystems. We then use this model to analyse data to demonstrate that the size-spectra of a community can be used to predict decomposition rates by analysing an illustrative dataset. This modelling methodology allows comparison of the riverine bioreactor's performance across habitats and at a global scale. Our integrative analytical approach can be applied to advance understanding of the functioning and efficiency of the riverine bioreactor as hotspots of metabolic activity. Application of insights gained from such analyses could inform the development of strategies that promote the functioning of the riverine bioreactor across global ecosystems.
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Affiliation(s)
- Ignacio Peralta-Maraver
- Departamento de Ecología, Universidad de Granada, Granada, Spain; Department of Life Sciences, Roehampton University, London, UK.
| | - Rachel Stubbington
- School of Science and Technology, Nottingham Trent University, Nottingham, UK
| | - Shai Arnon
- Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Beersheba, Israel
| | - Pavel Kratina
- School of Biological and Chemical Sciences, Queen Mary University of London, London, UK
| | - Stefan Krause
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, UK
| | - Vivian de Mello Cionek
- Programa de Pós-Graduação em Ciência e Tecnologia Ambiental, Universidade do Vale do Itajaí, Itajaí, Santa Catarina, Brazil
| | - Nei Kavaguichi Leite
- Department of Ecology and Zoology, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Aurea Luiza Lemes da Silva
- Department of Ecology and Zoology, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | | | - Malte Posselt
- Department of Environmental Science, Stockholm University, Stockholm, Sweden
| | | | - Andrea Momblanch
- Cranfield Water Science Institute, Cranfield University, Cranfield, UK
| | - Marcelo S Moretti
- Laboratory of Aquatic Insect Ecology, Universidade Vila Velha, Vila Velha, Espírito Santo, Brazil
| | - Rodolfo L B Nóbrega
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot SL5 7PY, UK
| | | | - Mauricio M Petrucio
- Department of Ecology and Zoology, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Isabel Reche
- Departamento de Ecología, Universidad de Granada, Granada, Spain
| | - Victor Saito
- Departamento de Ciências Ambientais, Universidade Federal de São Carlos, São Carlos, São Paulo, Brazil
| | - Hugo Sarmento
- Department of Hydrobiology, Universidade Federal de São Carlos, São Carlos, São Paulo, Brazil
| | - Emily Strange
- Institute of Environmental Sciences, Leiden University, Leiden, the Netherlands
| | - Ricardo Hideo Taniwaki
- Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Santo André, São Paulo, Brazil
| | - James White
- River Restoration Centre, Cranfield University, Cranfield, Bedfordshire, UK
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138
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Tablado Z, Bötsch Y, Bókony V, Angelier F, Lendvai ÁZ, Jenni-Eiermann S, Jenni L. Factors modulating the behavioral and physiological stress responses: Do they modify the relationship between flight initiation distance and corticosterone reactivity? Horm Behav 2021; 132:104979. [PMID: 33878607 DOI: 10.1016/j.yhbeh.2021.104979] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/29/2021] [Accepted: 03/31/2021] [Indexed: 11/25/2022]
Abstract
Understanding how vulnerable species are to new stressors, such as anthropogenic changes, is crucial for mitigating their potential negative consequences. Many studies have investigated species sensitivity to human disturbance by focusing on single behavioral or physiological parameters, such as flight initiation distance and glucocorticoid levels. However, little is known about the differential effect that modulating factors might have on behavioral versus physiological stress responses across species. This lack of knowledge make difficult to understand the relationship between both types of reactions, and thus to assess to what extent a behavioral reaction is representative of an internal physiological stress response or vice versa. We collected published data on bird flight initiation distances (FID) and corticosterone (CORT) responses, the two most frequently used indicators of stress reaction. We then investigated how spatio-temporal factors or species-specific characteristics relate to these behavioral and physiological stress responses, and potentially modify the relationship between them. Additionally, we evaluated the strength of the correlation between the two stress responses (behavioral and physiological). Our findings showed that FID and CORT responses were poorly correlated across species, and the lack of correlation was attributable to modulating factors (e.g. latitude and body mass) which influence behavior and physiology differently. These modulating factors, therefore, should be taken into consideration to better interpret FID and CORT responses in the context of species vulnerability to stress.
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Affiliation(s)
- Zulima Tablado
- Swiss Ornithological Institute, CH-6204 Sempach, Switzerland.
| | - Yves Bötsch
- Swiss Ornithological Institute, CH-6204 Sempach, Switzerland.
| | - Veronika Bókony
- Lendület Evolutionary Ecology Research Group, Plant Protection Institute, Centre for Agricultural Research, Eötvös Loránd Research Network, Herman Ottó u. 15, H-1022 Budapest, Hungary.
| | - Frédéric Angelier
- Centre d'Etudes Biologiques de Chizé, CNRS, 79360 Villiers en Bois, France.
| | - Ádám Z Lendvai
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary.
| | | | - Lukas Jenni
- Swiss Ornithological Institute, CH-6204 Sempach, Switzerland.
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139
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Freeman BG, Pennell MW. The latitudinal taxonomy gradient. Trends Ecol Evol 2021; 36:778-786. [PMID: 34074540 DOI: 10.1016/j.tree.2021.05.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 05/03/2021] [Accepted: 05/06/2021] [Indexed: 10/21/2022]
Abstract
Emerging large-scale datasets coupled with statistical advances have provided new insights into the processes that generate the latitudinal diversity gradient (LDG). But many of these studies run into an old, if often underappreciated, problem: The interpretation of the data critically depends on the consistent application of criteria to define what constitutes a species. This is particularly pernicious for the LDG because good species have been easier to recognize in temperate than in tropical regions. We provide evidence that this latitudinal taxonomy gradient exists, discuss how this potentially impacts inferences about latitudinal variation in ecoevolutionary processes such as population differentiation and speciation, and provide a roadmap for how to mitigate taxonomic biases in the study of biodiversity patterns.
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Affiliation(s)
- Benjamin G Freeman
- Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada, V6T1Z4; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada.
| | - Matthew W Pennell
- Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada, V6T1Z4; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada
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140
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Sedio BE, Spasojevic MJ, Myers JA, Wright SJ, Person MD, Chandrasekaran H, Dwenger JH, Prechi ML, López CA, Allen DN, Anderson-Teixeira KJ, Baltzer JL, Bourg NA, Castillo BT, Day NJ, Dewald-Wang E, Dick CW, James TY, Kueneman JG, LaManna J, Lutz JA, McGregor IR, McMahon SM, Parker GG, Parker JD, Vandermeer JH. Chemical Similarity of Co-occurring Trees Decreases With Precipitation and Temperature in North American Forests. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.679638] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Plant diversity varies immensely over large-scale gradients in temperature, precipitation, and seasonality at global and regional scales. This relationship may be driven in part by climatic variation in the relative importance of abiotic and biotic interactions to the diversity and composition of plant communities. In particular, biotic interactions may become stronger and more host specific with increasing precipitation and temperature, resulting in greater plant species richness in wetter and warmer environments. This hypothesis predicts that the many defensive compounds found in plants’ metabolomes should increase in richness and decrease in interspecific similarity with precipitation, temperature, and plant diversity. To test this prediction, we compared patterns of chemical and morphological trait diversity of 140 woody plant species among seven temperate forests in North America representing 16.2°C variation in mean annual temperature (MAT), 2,115 mm variation in mean annual precipitation (MAP), and from 10 to 68 co-occurring species. We used untargeted metabolomics methods based on data generated with liquid chromatography-tandem mass spectrometry to identify, classify, and compare 13,480 unique foliar metabolites and to quantify the metabolomic similarity of species in each community with respect to the whole metabolome and each of five broad classes of metabolites. In addition, we compiled morphological trait data from existing databases and field surveys for three commonly measured traits (specific leaf area [SLA], wood density, and seed mass) for comparison with foliar metabolomes. We found that chemical defense strategies and growth and allocation strategies reflected by these traits largely represented orthogonal axes of variation. In addition, functional dispersion of SLA increased with MAP, whereas functional richness of wood density and seed mass increased with MAT. In contrast, chemical similarity of co-occurring species decreased with both MAT and MAP, and metabolite richness increased with MAT. Variation in metabolite richness among communities was positively correlated with species richness, but variation in mean chemical similarity was not. Our results are consistent with the hypothesis that plant metabolomes play a more important role in community assembly in wetter and warmer climates, even at temperate latitudes, and suggest that metabolomic traits can provide unique insight to studies of trait-based community assembly.
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141
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Halliday FW, Jalo M, Laine AL. The effect of host community functional traits on plant disease risk varies along an elevational gradient. eLife 2021; 10:67340. [PMID: 33983120 PMCID: PMC8208817 DOI: 10.7554/elife.67340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 05/10/2021] [Indexed: 01/17/2023] Open
Abstract
Quantifying the relative impact of environmental conditions and host community structure on disease is one of the greatest challenges of the 21st century, as both climate and biodiversity are changing at unprecedented rates. Both increasing temperature and shifting host communities toward more fast-paced life-history strategies are predicted to increase disease, yet their independent and interactive effects on disease in natural communities remain unknown. Here, we address this challenge by surveying foliar disease symptoms in 220, 0.5 m-diameter herbaceous plant communities along a 1100-m elevational gradient. We find that increasing temperature associated with lower elevation can increase disease by (1) relaxing constraints on parasite growth and reproduction, (2) determining which host species are present in a given location, and (3) strengthening the positive effect of host community pace-of-life on disease. These results provide the first field evidence, under natural conditions, that environmental gradients can alter how host community structure affects disease. Climate change is causing shifts in the ecology and biodiversity of different world regions at unprecedented rates. Global warming is also linked with changes in the risk for certain infectious diseases in humans, but also in animals and plants. There are several possible mechanisms for this. For one thing, changing weather patterns may affect how pathogens grow and reproduce. For another, the distribution ranges of animal and plant hosts of certain disease-causing pathogens are changing because of global warming. This means that the distributions of pathogens are also changing, and so is the severity of the diseases that they cause. Increasing temperatures may also influence the physiological traits that make host species suitable for pathogens. This is because the traits that allow species to survive or adapt to changes in their environment may also make them better at hosting and transmitting the pathogens that cause disease. For example, in plant communities, rising temperatures could favor species with faster growth rates, quicker reproduction and high dispersal, and these traits are often associated with more efficient spread of disease. Despite a lot of research into the effects of climate, it remains unclear how temperature, pathogen growth and reproduction, and host species’ traits and distributions combine and interact to alter infectious disease risk, especially in wild plant communities. To investigate this, Halliday, Jalo and Laine studied an area in southeast Switzerland where natural temperature and biodiversity change gradually through the region. The aim was to explore how relationships between plant biodiversity, pathogens and disease risk change with temperature, and to understand whether environmental or biological factors influence infectious disease risk more. Halliday, Jalo and Laine measured the levels of fungal diseases found in the leaves of plant communities spanning 1,100 meters of elevation, showing that higher temperatures increase disease risk both directly and indirectly. Directly, higher temperatures increased pathogen growth and reproduction, and indirectly, they influenced which plants were present and therefore able to act as disease hosts. The results also indicated that temperature can affect how the traits of plants drive the transmission rates of fungal pathogens. Important predictors of disease risk were traits relating to the growth rate of host plants, which tended to increase in areas with low elevation where the surface of the soil was warm. This study represents the first analysis, in wild plants, of how changing temperatures, the traits of shifting host species, and resident parasite populations interact to impact infectious disease risk. The insights Halliday, Jalo and Laine provided could aid in predicting how global climate change will influence infectious disease risk.
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Affiliation(s)
- Fletcher W Halliday
- Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zurich, Switzerland
| | - Mikko Jalo
- Faculty of Biological and Environmental sciences, University of Helsinki, Helsinki, Finland
| | - Anna-Liisa Laine
- Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zurich, Switzerland.,Faculty of Biological and Environmental sciences, University of Helsinki, Helsinki, Finland
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142
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Su H, Feng Y, Chen J, Chen J, Ma S, Fang J, Xie P. Determinants of trophic cascade strength in freshwater ecosystems: a global analysis. Ecology 2021; 102:e03370. [PMID: 33961286 DOI: 10.1002/ecy.3370] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 01/24/2021] [Accepted: 02/22/2021] [Indexed: 11/08/2022]
Abstract
Top-down cascade effects are among the most important mechanisms underlying community structure and abundance dynamics in aquatic and terrestrial ecosystems worldwide. A current challenge is understanding the factors controlling trophic cascade strength under global environmental changes. Here, we synthesized 161 global sites to analyze how multiple factors influence consumer-resource interactions with fish in freshwater ecosystems. Fish have a profound negative effect on zooplankton and water clarity but positive effects on primary producers and water nutrients. Furthermore, fish trophic levels can modify the strength of trophic cascades, but an even number of food chain length does not have a negative effect on primary producers in real ecosystems. Eutrophication, warming, and predator abundance strengthen the trophic cascade effects on phytoplankton, suggesting that top-down control will be increasingly important under future global environmental changes. We found no influence or even an increasing trophic cascade strength (e.g., phytoplankton) with increasing latitude, which does not support the widespread view that the trophic cascade strength increases closer to the equator. With increasing temporal and spatial scales, the experimental duration has an accumulative effect, whereas the experimental size is not associated with the trophic cascade strength. Taken together, eutrophication, warming, temporal scale, and predator trophic level and abundance are pivotal to understanding the impacts of multiple environmental factors on the trophic cascade strength. Future studies should stress the possible synergistic effect of multiple factors on the food web structure and dynamics.
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Affiliation(s)
- Haojie Su
- Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.,Institute of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
| | - Yuhao Feng
- Institute of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
| | - Jianfeng Chen
- Poyang Lake Eco-economy Research Center, Jiujiang University, Jiujiang, 332005, China
| | - Jun Chen
- Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Suhui Ma
- Institute of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
| | - Jingyun Fang
- Institute of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
| | - Ping Xie
- Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.,Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming, 650091, China
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143
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Holding ML, Strickland JL, Rautsaw RM, Hofmann EP, Mason AJ, Hogan MP, Nystrom GS, Ellsworth SA, Colston TJ, Borja M, Castañeda-Gaytán G, Grünwald CI, Jones JM, Freitas-de-Sousa LA, Viala VL, Margres MJ, Hingst-Zaher E, Junqueira-de-Azevedo ILM, Moura-da-Silva AM, Grazziotin FG, Gibbs HL, Rokyta DR, Parkinson CL. Phylogenetically diverse diets favor more complex venoms in North American pitvipers. Proc Natl Acad Sci U S A 2021; 118:e2015579118. [PMID: 33875585 PMCID: PMC8092465 DOI: 10.1073/pnas.2015579118] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The role of natural selection in the evolution of trait complexity can be characterized by testing hypothesized links between complex forms and their functions across species. Predatory venoms are composed of multiple proteins that collectively function to incapacitate prey. Venom complexity fluctuates over evolutionary timescales, with apparent increases and decreases in complexity, and yet the causes of this variation are unclear. We tested alternative hypotheses linking venom complexity and ecological sources of selection from diet in the largest clade of front-fanged venomous snakes in North America: the rattlesnakes, copperheads, cantils, and cottonmouths. We generated independent transcriptomic and proteomic measures of venom complexity and collated several natural history studies to quantify dietary variation. We then constructed genome-scale phylogenies for these snakes for comparative analyses. Strikingly, prey phylogenetic diversity was more strongly correlated to venom complexity than was overall prey species diversity, specifically implicating prey species' divergence, rather than the number of lineages alone, in the evolution of complexity. Prey phylogenetic diversity further predicted transcriptomic complexity of three of the four largest gene families in viper venom, showing that complexity evolution is a concerted response among many independent gene families. We suggest that the phylogenetic diversity of prey measures functionally relevant divergence in the targets of venom, a claim supported by sequence diversity in the coagulation cascade targets of venom. Our results support the general concept that the diversity of species in an ecological community is more important than their overall number in determining evolutionary patterns in predator trait complexity.
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Affiliation(s)
- Matthew L Holding
- Department of Biological Sciences, Clemson University, Clemson, SC 29634;
- Department of Biological Science, Florida State University, Tallahassee, FL 32306
| | - Jason L Strickland
- Department of Biological Sciences, Clemson University, Clemson, SC 29634
| | - Rhett M Rautsaw
- Department of Biological Sciences, Clemson University, Clemson, SC 29634
| | - Erich P Hofmann
- Department of Biological Sciences, Clemson University, Clemson, SC 29634
| | - Andrew J Mason
- Department of Biological Sciences, Clemson University, Clemson, SC 29634
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH 43210
| | - Michael P Hogan
- Department of Biological Science, Florida State University, Tallahassee, FL 32306
| | - Gunnar S Nystrom
- Department of Biological Science, Florida State University, Tallahassee, FL 32306
| | - Schyler A Ellsworth
- Department of Biological Science, Florida State University, Tallahassee, FL 32306
| | - Timothy J Colston
- Department of Biological Science, Florida State University, Tallahassee, FL 32306
| | - Miguel Borja
- Facultad de Ciencias Biológicas, Universidad Juárez del Estado de Durango, C.P. 35010 Gómez Palacio, Dgo., Mexico
| | - Gamaliel Castañeda-Gaytán
- Facultad de Ciencias Biológicas, Universidad Juárez del Estado de Durango, C.P. 35010 Gómez Palacio, Dgo., Mexico
| | | | - Jason M Jones
- HERP.MX A.C., Villa del Álvarez, Colima 28973, Mexico
| | | | - Vincent Louis Viala
- Laboratório de Toxinologia Aplicada, Instituto Butantan, São Paulo 05503-900, Brazil
- Center of Toxins, Immune-Response and Cell Signaling, São Paulo 05503-900, Brazil
| | - Mark J Margres
- Department of Biological Sciences, Clemson University, Clemson, SC 29634
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138
| | | | - Inácio L M Junqueira-de-Azevedo
- Laboratório de Toxinologia Aplicada, Instituto Butantan, São Paulo 05503-900, Brazil
- Center of Toxins, Immune-Response and Cell Signaling, São Paulo 05503-900, Brazil
| | - Ana M Moura-da-Silva
- Laboratório de Imunopatologia, Instituto Butantan, São Paulo 05503-900, Brazil
- Instituto de Pesquisa Clínica Carlos Borborema, Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus 69040, Brazil
| | - Felipe G Grazziotin
- Laboratório de Coleções Zoológicas, Instituto Butantan, São Paulo 05503-900, Brazil
| | - H Lisle Gibbs
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH 43210
| | - Darin R Rokyta
- Department of Biological Science, Florida State University, Tallahassee, FL 32306
| | - Christopher L Parkinson
- Department of Biological Sciences, Clemson University, Clemson, SC 29634;
- Department of Forestry and Environmental Conservation, Clemson University, Clemson, SC 29634
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144
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Furness EN, Garwood RJ, Mannion PD, Sutton MD. Evolutionary simulations clarify and reconcile biodiversity-disturbance models. Proc Biol Sci 2021; 288:20210240. [PMID: 33878917 PMCID: PMC8059584 DOI: 10.1098/rspb.2021.0240] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
There is significant geographic variation in species richness. However, the nature of the underlying relationships, such as that between species richness and environmental stability, remains unclear. The stability-time hypothesis suggests that environmental instability reduces species richness by suppressing speciation and increasing extinction risk. By contrast, the patch-mosaic hypothesis suggests that small-scale environmental instability can increase species richness by providing a steady supply of non-equilibrium environments. Although these hypotheses are often applied to different time scales, their core mechanisms are in conflict. Reconciling these apparently competing hypotheses is key to understanding how environmental conditions shape the distribution of biodiversity. Here, we use REvoSim, an individual-based, eco-evolutionary system, to model the evolution of sessile organisms in environments with varying magnitudes and scales of environmental instability. We demonstrate that when environments have substantial permanent heterogeneity, a high level of localized environmental instability reduces biodiversity, whereas in environments lacking permanent heterogeneity, high levels of localized instability increase biodiversity. By contrast, broad-scale environmental instability, acting on the same time scale, invariably reduces biodiversity. Our results provide a new view of the biodiversity–disturbance relationship that reconciles contrasting hypotheses within a single model and implies constraints on the environmental conditions under which those hypotheses apply. These constraints can inform attempts to conserve adaptive potential in different environments during the current biodiversity crisis.
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Affiliation(s)
- Euan N Furness
- Department of Earth Sciences and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.,Science and Solutions for a Changing Planet DTP, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
| | - Russell J Garwood
- Department of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK.,Earth Sciences Department, Natural History Museum, London SW7 5BD, UK
| | - Philip D Mannion
- Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
| | - Mark D Sutton
- Department of Earth Sciences and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
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145
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Temperature and Prey Species Richness Drive the Broad-Scale Distribution of a Generalist Predator. DIVERSITY 2021. [DOI: 10.3390/d13040169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The ongoing climate change and the unprecedented rate of biodiversity loss render the need to accurately project future species distributional patterns more critical than ever. Mounting evidence suggests that not only abiotic factors, but also biotic interactions drive broad-scale distributional patterns. Here, we explored the effect of predator-prey interaction on the predator distribution, using as target species the widespread and generalist grass snake (Natrix natrix). We used ensemble Species Distribution Modeling (SDM) to build a model only with abiotic variables (abiotic model) and a biotic one including prey species richness. Then we projected the future grass snake distribution using a modest emission scenario assuming an unhindered and no dispersal scenario. The two models performed equally well, with temperature and prey species richness emerging as the top drivers of species distribution in the abiotic and biotic models, respectively. In the future, a severe range contraction is anticipated in the case of no dispersal, a likely possibility as reptiles are poor dispersers. If the species can disperse freely, an improbable scenario due to habitat loss and fragmentation, it will lose part of its contemporary distribution, but it will expand northwards.
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146
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Wu R, Lev-Yadun S, Sun L, Sun H, Song B. Higher Elevations Tend to Have Higher Proportion of Plant Species With Glandular Trichomes. FRONTIERS IN PLANT SCIENCE 2021; 12:632464. [PMID: 33912203 PMCID: PMC8075162 DOI: 10.3389/fpls.2021.632464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 03/02/2021] [Indexed: 06/12/2023]
Abstract
Glandular trichomes are well known to participate in plant chemical and physical defenses against herbivores, especially herbivorous insects. However, little is known about large-scale geographical patterns in glandular trichome occurrence. Herbivory pressure is thought to be higher at low elevations because of warmer and more stable climates. We therefore predicted a higher proportion of species with glandular trichomes at low elevations than at higher elevations. We compiled glandular trichome data (presence/absence) for 6,262 angiosperm species from the Hengduan Mountains (a global biodiversity hotspot in southwest China). We tested the elevational gradient (800-5,000 m a.s.l.) in the occurrence of plant species with glandular trichomes, and its correlations with biotic (occurrence of herbivorous insects) and abiotic factors, potentially shaping the elevational gradient in the occurrence of glandular trichomes. We found a significantly positive relationship between elevation and the occurrence of glandular trichomes, with the proportion of species having glandular trichomes increasing from 11.89% at 800 m a.s.l. to 17.92% at above 4,700 m. This cross-species relationship remained significant after accounting for phylogenetic relationships between species. Herbivorous insect richness peaked at mid-elevations and its association with the incidence of glandular trichomes was weak. Mean annual temperature was the most important factor associated negatively with glandular trichomes. Our results do not support the hypothesis that plant defenses decrease with increasing elevation. In contrast, a higher proportion of plant species with glandular trichome toward higher elevations is observed. Our results also highlight the importance of considering the simultaneous influences of biotic and abiotic factors in testing geographical variation in multifunctional plant defenses.
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Affiliation(s)
- Rui Wu
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi’an, China
- Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Simcha Lev-Yadun
- Department of Biology and Environment, Faculty of Natural Sciences, University of Haifa at Oranim, Kiryat Tiv’on, Israel
| | - Lu Sun
- Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Hang Sun
- Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Bo Song
- Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
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147
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Global warming is causing a more pronounced dip in marine species richness around the equator. Proc Natl Acad Sci U S A 2021; 118:2015094118. [PMID: 33876750 DOI: 10.1073/pnas.2015094118] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The latitudinal gradient in species richness, with more species in the tropics and richness declining with latitude, is widely known and has been assumed to be stable over recent centuries. We analyzed data on 48,661 marine animal species since 1955, accounting for sampling variation, to assess whether the global latitudinal gradient in species richness is being impacted by climate change. We confirm recent studies that show a slight dip in species richness at the equator. Moreover, richness across latitudinal bands was sensitive to temperature, reaching a plateau or declining above a mean annual sea surface temperature of 20 °C for most taxa. In response, since the 1970s, species richness has declined at the equator relative to an increase at midlatitudes and has shifted north in the northern hemisphere, particularly among pelagic species. This pattern is consistent with the hypothesis that climate change is impacting the latitudinal gradient in marine biodiversity at a global scale. The intensification of the dip in species richness at the equator, especially for pelagic species, suggests that it is already too warm there for some species to survive.
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148
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Yang Y, Liu M, Pan Y, Huang H, Pan X, Sosa A, Hou Y, Zhu Z, Li B. Rapid evolution of latitudinal clines in growth and defence of an invasive weed. THE NEW PHYTOLOGIST 2021; 230:845-856. [PMID: 33454953 DOI: 10.1111/nph.17193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 12/17/2020] [Indexed: 06/12/2023]
Abstract
Re-establishment of heritable latitudinal clines in growth-related traits has been recognised as evidence for adaptive evolution in invasive plants. However, less information is known about latitudinal clines in defence and joint clinal evolution of growth and defence in invasive plants. We planted 14 native Argentinean populations and 14 introduced Chinese populations of Alternanthera philoxeroides in replicate common gardens in China. We investigated the latitudinal clines of traits related to growth and defence, and plasticity of these traits in relation to experiment site and soil nitrogen. We found that chemical defence decreased with latitude in introduced populations but increased with latitude in native populations. For growth rate, latitudinal clines were positive in introduced populations but nonexistent in native populations. There were also parallel positive latitudinal clines in total/shoot biomass and specific leaf area. Experiment site affected the occurrence or magnitude of latitudinal clines in growth rate, branch intensity and triterpenoid saponins concentration. Introduced populations were more plastic to experiment site and soil nitrogen than native populations. We provide evidence for rapid evolution of clines in growth and defence in an invasive plant. Altered herbivory gradients and trade-off between growth and defence may explain nonparallel clines between the native and introduced ranges.
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Affiliation(s)
- Yang Yang
- National Observation and Research Station for Yangtze Estuarine Wetland Ecosystems, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, School of Life Sciences, Fudan University, #2005 Songhu Road, Shanghai, 200438, China
| | - Mu Liu
- National Observation and Research Station for Yangtze Estuarine Wetland Ecosystems, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, School of Life Sciences, Fudan University, #2005 Songhu Road, Shanghai, 200438, China
| | - Yuanfei Pan
- National Observation and Research Station for Yangtze Estuarine Wetland Ecosystems, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, School of Life Sciences, Fudan University, #2005 Songhu Road, Shanghai, 200438, China
- School of Public Health, Fudan University, Shanghai, 200032, China
| | - Heyan Huang
- National Observation and Research Station for Yangtze Estuarine Wetland Ecosystems, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, School of Life Sciences, Fudan University, #2005 Songhu Road, Shanghai, 200438, China
| | - Xiaoyun Pan
- National Observation and Research Station for Yangtze Estuarine Wetland Ecosystems, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, School of Life Sciences, Fudan University, #2005 Songhu Road, Shanghai, 200438, China
- Research Center for Ecology, College of Science, Tibet University, Lhasa, 850000, China
- Tibet University - Fudan University Joint Laboratory for Biodiversity and Global Change, Fudan University, Shanghai, 200032, China
| | - Alejandro Sosa
- Fundación para el Estudio de Especies Invasivas (FuEDEI), Hurlingham, Buenos Aires, 999071, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Buenos Aires, 999071, Argentina
| | - Yuping Hou
- College of Life Sciences, Ludong University, Yantai, 264025, China
| | - Zhengcai Zhu
- Guangzhou Zengcheng Institute of Forestry and Landscape Architecture, Guangzhou, 511300, China
| | - Bo Li
- National Observation and Research Station for Yangtze Estuarine Wetland Ecosystems, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, School of Life Sciences, Fudan University, #2005 Songhu Road, Shanghai, 200438, China
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149
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Finger-Higgens R, DeSiervo M, Ayres MP, Virginia RA. Increasing shrub damage by invertebrate herbivores in the warming and drying tundra of West Greenland. Oecologia 2021; 195:995-1005. [PMID: 33786709 DOI: 10.1007/s00442-021-04899-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 03/23/2021] [Indexed: 11/28/2022]
Abstract
Rapid warming is predicted to increase insect herbivory across the tundra biome, yet how this will impact the community and ecosystem dynamics remains poorly understood. Increasing background invertebrate herbivory could impede Arctic greening, by serving as a top-down control on tundra vegetation. Many tundra ecosystems are also susceptible to severe insect herbivory outbreaks which can have lasting effects on vegetation communities. To explore how tundra-insect herbivore systems respond to warming, we measured shrub traits and foliar herbivory damage at 16 sites along a landscape gradient in western Greenland. Here we show that shrub foliar insect herbivory damage on two dominant deciduous shrubs, Salix glauca and Betula nana, was positively correlated with increasing temperatures throughout the first half of the 2017 growing season. We found that the majority of insect herbivory damage occurred in July, which was outside the period of rapid leaf expansion that occurred throughout most of June. Defoliators caused the most foliar damage in both shrub species. Additionally, insect herbivores removed a larger proportion of B. nana leaf biomass in warmer sites, which is due to a combination of increased foliar herbivory with a coinciding decline in foliar biomass. These results suggest that the effects of rising temperatures on both insect herbivores and host species are important to consider when predicting the trajectory of Arctic tundra shrub expansion.
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Affiliation(s)
- Rebecca Finger-Higgens
- Ecology, Evolution, Ecosystems and Society Graduate Program, Dartmouth College, Hanover, NH, USA.
| | | | - Matthew P Ayres
- Ecology, Evolution, Ecosystems and Society Graduate Program, Dartmouth College, Hanover, NH, USA.,Department of Biological Science, Dartmouth College, Hanover, NH, USA
| | - Ross A Virginia
- Ecology, Evolution, Ecosystems and Society Graduate Program, Dartmouth College, Hanover, NH, USA.,Environmental Studies Program, Dartmouth College, Hanover, NH, USA
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150
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Matute DR, Cooper BS. Comparative studies on speciation: 30 years since Coyne and Orr. Evolution 2021; 75:764-778. [PMID: 33491225 PMCID: PMC8247902 DOI: 10.1111/evo.14181] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 12/16/2020] [Accepted: 12/22/2020] [Indexed: 12/28/2022]
Abstract
Understanding the processes of population divergence and speciation remains a core question in evolutionary biology. For nearly a hundred years evolutionary geneticists have characterized reproductive isolation (RI) mechanisms and specific barriers to gene flow required for species formation. The seminal work of Coyne and Orr provided the first comprehensive comparative analysis of speciation. By combining phylogenetic hypotheses and species range data with estimates of genetic divergence and multiple mechanisms of RI across Drosophila, Coyne and Orr's influential meta-analyses answered fundamental questions and motivated new analyses that continue to push the field forward today. Now 30 years later, we revisit the five questions addressed by Coyne and Orr, identifying results that remain well supported and others that seem less robust with new data. We then consider the future of speciation research, with emphasis on areas where novel methods and data motivate potential progress. While the literature remains biased towards Drosophila and other model systems, we are enthusiastic about the future of the field.
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Affiliation(s)
- Daniel R. Matute
- Biology DepartmentUniversity of North CarolinaChapel HillNorth Carolina27510
| | - Brandon S. Cooper
- Division of Biological SciencesUniversity of MontanaMissoulaMontana59812
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