1
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Graham NR, Krehenwinkel H, Lim JY, Staniczenko P, Callaghan J, Andersen JC, Gruner DS, Gillespie RG. Ecological network structure in response to community assembly processes over evolutionary time. Mol Ecol 2023; 32:6489-6506. [PMID: 36738159 DOI: 10.1111/mec.16873] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 01/07/2023] [Accepted: 01/25/2023] [Indexed: 02/05/2023]
Abstract
The dynamic structure of ecological communities results from interactions among taxa that change with shifts in species composition in space and time. However, our ability to study the interplay of ecological and evolutionary processes on community assembly remains relatively unexplored due to the difficulty of measuring community structure over long temporal scales. Here, we made use of a geological chronosequence across the Hawaiian Islands, representing 50 years to 4.15 million years of ecosystem development, to sample 11 communities of arthropods and their associated plant taxa using semiquantitative DNA metabarcoding. We then examined how ecological communities changed with community age by calculating quantitative network statistics for bipartite networks of arthropod-plant associations. The average number of interactions per species (linkage density), ratio of plant to arthropod species (vulnerability) and uniformity of energy flow (interaction evenness) increased significantly in concert with community age. The index of specializationH 2 ' has a curvilinear relationship with community age. Our analyses suggest that younger communities are characterized by fewer but stronger interactions, while biotic associations become more even and diverse as communities mature. These shifts in structure became especially prominent on East Maui (~0.5 million years old) and older volcanos, after enough time had elapsed for adaptation and specialization to act on populations in situ. Such natural progression of specialization during community assembly is probably impeded by the rapid infiltration of non-native species, with special risk to younger or more recently disturbed communities that are composed of fewer specialized relationships.
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Affiliation(s)
- Natalie R Graham
- Department of Environmental Sciences Policy and Management, University of California Berkeley, Berkeley, California, USA
| | - Henrik Krehenwinkel
- Department of Biogeography, Faculty of Regional and Environmental Sciences, Trier University, Trier, Germany
| | - Jun Ying Lim
- Department of Biological Sciences, National University of Singapore, Singapore
| | - Phillip Staniczenko
- Department of Biology, Brooklyn College, City University of New York, New York, New York, USA
| | - Jackson Callaghan
- Department of Integrative, Structural and Computational Biology, The Scripps Research Institute, San Diego, California, USA
| | - Jeremy C Andersen
- Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, Massachusetts, USA
| | - Daniel S Gruner
- Department of Entomology, University of Maryland, College Park, Maryland, USA
| | - Rosemary G Gillespie
- Department of Environmental Sciences Policy and Management, University of California Berkeley, Berkeley, California, USA
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2
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Kempel A, Allan E, Gossner MM, Jochum M, Grace JB, Wardle DA. From bottom-up to top-down control of invertebrate herbivores in a retrogressive chronosequence. Ecol Lett 2023; 26:411-424. [PMID: 36688259 DOI: 10.1111/ele.14161] [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: 09/29/2022] [Revised: 12/15/2022] [Accepted: 12/16/2022] [Indexed: 01/24/2023]
Abstract
In the long-term absence of disturbance, ecosystems often enter a decline or retrogressive phase which leads to reductions in primary productivity, plant biomass, nutrient cycling and foliar quality. However, the consequences of ecosystem retrogression for higher trophic levels such as herbivores and predators, are less clear. Using a post-fire forested island-chronosequence across which retrogression occurs, we provide evidence that nutrient availability strongly controls invertebrate herbivore biomass when predators are few, but that there is a switch from bottom-up to top-down control when predators are common. This trophic flip in herbivore control probably arises because invertebrate predators respond to alternative energy channels from the adjacent aquatic matrix, which were independent of terrestrial plant biomass. Our results suggest that effects of nutrient limitation resulting from ecosystem retrogression on trophic cascades are modified by nutrient-independent variation in predator abundance, and this calls for a more holistic approach to trophic ecology to better understand herbivore effects on plant communities.
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Affiliation(s)
- Anne Kempel
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.,WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland.,Climate Change, Extremes and Natural Hazards in Alpine Regions Research Centre CERC, Davos, Switzerland.,University of Bern, Institute of Plant Sciences, Bern, Switzerland
| | - Eric Allan
- University of Bern, Institute of Plant Sciences, Bern, Switzerland
| | - Martin M Gossner
- Forest Entomology, WSL Swiss Federal Research Institute, Birmensdorf, Switzerland.,ETH Zurich, Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, Zurich, Switzerland
| | - Malte Jochum
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Leipzig University, Institute of Biology, Leipzig, Germany
| | | | - David A Wardle
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.,Nanyang Technological University, Asian School of the Environment, Singapore, Singapore
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3
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An equation of state unifies diversity, productivity, abundance and biomass. Commun Biol 2022; 5:874. [PMID: 36008589 PMCID: PMC9411111 DOI: 10.1038/s42003-022-03817-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 08/08/2022] [Indexed: 11/26/2022] Open
Abstract
To advance understanding of biodiversity and ecosystem function, ecologists seek widely applicable relationships among species diversity and other ecosystem characteristics such as species productivity, biomass, and abundance. These metrics vary widely across ecosystems and no relationship among any combination of them that is valid across habitats, taxa, and spatial scales, has heretofore been found. Here we derive such a relationship, an equation of state, among species richness, energy flow, biomass, and abundance by combining results from the Maximum Entropy Theory of Ecology and the Metabolic Theory of Ecology. It accurately captures the relationship among these state variables in 42 data sets, including vegetation and arthropod communities, that span a wide variety of spatial scales and habitats. The success of our ecological equation of state opens opportunities for estimating difficult-to-measure state variables from measurements of others, adds support for two current theories in ecology, and is a step toward unification in ecology. Combining metabolic and maximum entropy theories of ecology, the authors derive an equation of state capable of capturing the relationships between multiple ecological variables across varied spatial scales and habitats.
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4
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Butler OM, Lewis T, Maunsell SC, Rezaei Rashti M, Elser JJ, Mackey B, Chen C. The stoichiometric signature of high‐frequency fire in forest floor food webs. ECOL MONOGR 2021. [DOI: 10.1002/ecm.1477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Orpheus M. Butler
- Australian Rivers Institute and Griffith School of Environment and Science Griffith University Nathan Queensland Australia
- School of Life and Environmental Sciences The University of Sydney Sydney New South Wales Australia
| | - Tom Lewis
- Department of Agriculture and Fisheries Agri‐Science Queensland University of the Sunshine Coast Maroochydore DC Queensland Australia
| | - Sarah C. Maunsell
- Department of Organismic and Evolutionary Biology Harvard University Boston Massachusetts USA
| | - Mehran Rezaei Rashti
- Australian Rivers Institute and Griffith School of Environment and Science Griffith University Nathan Queensland Australia
| | - James J. Elser
- Flathead Lake Biological Station University of Montana Polson Montana USA
| | - Brendan Mackey
- Griffith Climate Change Response Program Griffith University Gold Coast City Queensland Australia
| | - Chengrong Chen
- Australian Rivers Institute and Griffith School of Environment and Science Griffith University Nathan Queensland Australia
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5
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Zhao W, Pan F, Meng F, Soininen J, Tupola V, Ren M, Zhu L, Wang J. Cross-taxon congruence of aquatic microbial communities across geological ages in Iceland: Stochastic and deterministic processes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 774:145103. [PMID: 33607439 DOI: 10.1016/j.scitotenv.2021.145103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 12/30/2020] [Accepted: 12/30/2020] [Indexed: 06/12/2023]
Abstract
Biotic groups usually have nonrandom cross-taxon relationships in their biodiversity or compositions across sites, but it is poorly known how such congruence varies across long-term ecosystem development, and what are the ecological processes underlying biodiversity patterns. Here, we examined the cross-taxon congruence in diversity and compositions of bacteria, fungi and diatoms in streams from four regions with different geological ages in Iceland, and further studied their community assembly processes. Bacteria and fungi showed contrasting trends in alpha and gamma diversities across geological ages, while their beta diversity patterns were consistent, being the lowest in the oldest region. The three taxonomic groups had the strongest cross-taxon congruence of beta diversity in the oldest region, while the weakest for intermediate-aged regions. Although environmental variables played important roles in shaping their congruence, biotic interaction had nonnegligible influences. Deterministic processes, being dominant for bacteria and fungi, had the highest relative influence in intermediate-aged regions, whereas diatoms showed higher stochasticity. We proposed a four-phase conceptual model to show how the balance of deterministic and stochastic processes changes across geological ages. Taken together, our results provide an advanced understanding of cross-taxon congruence and community assembly processes for aquatic communities over long-term periods of geological age.
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Affiliation(s)
- Wenqian Zhao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Feiyan Pan
- School of Biological Sciences, Nanjing Normal University, Nanjing 210046, China
| | - Fanfan Meng
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Janne Soininen
- Department of Geosciences and Geography, University of Helsinki, PO Box 64, Helsinki FIN-00014, Finland
| | - Vilja Tupola
- Department of Geosciences and Geography, University of Helsinki, PO Box 64, Helsinki FIN-00014, Finland
| | - Minglei Ren
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Lifeng Zhu
- School of Biological Sciences, Nanjing Normal University, Nanjing 210046, China
| | - Jianjun Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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6
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Moody KN, Scherer AE, O’Connor DAJS, Heim-Ballew H, Lisi PJ, Hogan JD, McIntyre PB, Blum MJ. Effectiveness and outcomes of invasive species removal in Hawaiian streams. Biol Invasions 2021. [DOI: 10.1007/s10530-021-02468-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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7
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Abstract
Despite their differences, biological systems at different spatial scales tend to exhibit common organizational patterns. Unfortunately, these commonalities are often hard to grasp due to the highly specialized nature of modern science and the parcelled terminology employed by various scientific sub-disciplines. To explore these common organizational features, this paper provides a comparative study of diverse applications of the maximum entropy principle, which has found many uses at different biological spatial scales ranging from amino acids up to societies. By presenting these studies under a common approach and language, this paper aims to establish a unified view over these seemingly highly heterogeneous scenarios.
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8
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Bertram J, Newman EA, Dewar RC. Comparison of two maximum entropy models highlights the metabolic structure of metacommunities as a key determinant of local community assembly. Ecol Modell 2019. [DOI: 10.1016/j.ecolmodel.2019.108720] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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9
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Dissecting macroecological and macroevolutionary patterns of forest biodiversity across the Hawaiian archipelago. Proc Natl Acad Sci U S A 2019; 116:16436-16441. [PMID: 31358626 DOI: 10.1073/pnas.1901954116] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Biodiversity patterns emerge as a consequence of evolutionary and ecological processes. Their relative importance is frequently tested on model ecosystems such as oceanic islands that vary in both. However, the coarse-scale data typically used in biogeographic studies have limited inferential power to separate the effects of historical biogeographic factors (e.g., island age) from the effects of ecological ones (e.g., island area and habitat heterogeneity). Here, we describe local-scale biodiversity patterns of woody plants using a database of more than 500 forest plots from across the Hawaiian archipelago, where these volcanic islands differ in age by several million years. We show that, after controlling for factors such as island area and heterogeneity, the oldest islands (Kaua'i and O'ahu) have greater native species diversity per unit area than younger islands (Maui and Hawai'i), indicating an important role for macroevolutionary processes in driving not just whole-island differences in species diversity, but also local community assembly. Further, we find that older islands have a greater number of rare species that are more spatially clumped (i.e., higher within-island β-diversity) than younger islands. When we included alien species in our analyses, we found that the signal of macroevolutionary processes via island age was diluted. Our approach allows a more explicit test of the question of how macroevolutionary factors shape not just regional-scale biodiversity, but also local-scale community assembly patterns and processes in a model archipelago ecosystem, and it can be applied to disentangle biodiversity drivers in other systems.
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10
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Craven D, Knight TM, Barton KE, Bialic-Murphy L, Cordell S, Giardina CP, Gillespie TW, Ostertag R, Sack L, Chase JM. OpenNahele: the open Hawaiian forest plot database. Biodivers Data J 2018:e28406. [PMID: 30305799 PMCID: PMC6172291 DOI: 10.3897/bdj.6.e28406] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 09/11/2018] [Indexed: 11/16/2022] Open
Abstract
Background This data paper provides a description of OpenNahele, the open Hawaiian forest plot database. OpenNahele includes 530 forest plots across the Hawaiian archipelago containing 43,590 individuals of 185 native and alien tree, shrub and tree fern species across six islands. We include estimates of maximum plant size (D950.1 and Dmax3) for 58 woody plant species, a key functional trait associated with dispersal distance and competition for light. OpenNahele can serve as a platform to test key ecological, evolutionary and conservation questions in a hotspot archipelago. New information OpenNahele is the first database that compiles data from a large number of forest plots across the Hawaiian archipelago to allow broad and high resolution studies of biodiversity patterns. Keywords: Hawaii, forests, islands, biodiversity, community ecology, evolutionary ecology
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Affiliation(s)
- Dylan Craven
- Department of Community Ecology, Helmholtz Centre for Environmental Research - UFZ, Halle (Saale), Germany Department of Community Ecology, Helmholtz Centre for Environmental Research - UFZ Halle (Saale) Germany.,German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig Leipzig Germany.,University of Göttingen, Göttingen, Germany University of Göttingen Göttingen Germany
| | - Tiffany M Knight
- Department of Community Ecology, Helmholtz Centre for Environmental Research - UFZ, Halle (Saale), Germany Department of Community Ecology, Helmholtz Centre for Environmental Research - UFZ Halle (Saale) Germany.,German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig Leipzig Germany.,Institute of Biology, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany Institute of Biology, Martin Luther University Halle-Wittenberg Halle (Saale) Germany
| | - Kasey E Barton
- Department of Botany, University of Hawai'i at Mānoa, Honolulu, United States of America Department of Botany, University of Hawai'i at Mānoa Honolulu United States of America
| | - Lalasia Bialic-Murphy
- Department of Botany, University of Hawai'i at Mānoa, Honolulu, United States of America Department of Botany, University of Hawai'i at Mānoa Honolulu United States of America.,Department of Ecology and Evolutionary Biology, University of Tennessee Knoxville, Knoxville, United States of America Department of Ecology and Evolutionary Biology, University of Tennessee Knoxville Knoxville United States of America
| | - Susan Cordell
- Institute of Pacific Islands Forestry, USDA Forest Service, Hilo, United States of America Institute of Pacific Islands Forestry, USDA Forest Service Hilo United States of America
| | - Christian P Giardina
- Institute of Pacific Islands Forestry, USDA Forest Service, Hilo, United States of America Institute of Pacific Islands Forestry, USDA Forest Service Hilo United States of America
| | - Thomas W Gillespie
- University of California Los Angeles, Los Angeles, United States of America University of California Los Angeles Los Angeles United States of America
| | - Rebecca Ostertag
- Department of Biology, University of Hawai'i at Hilo, Hilo, United States of America Department of Biology, University of Hawai'i at Hilo Hilo United States of America
| | - Lawren Sack
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, Los Angeles, United States of America Department of Ecology and Evolutionary Biology, University of California Los Angeles Los Angeles United States of America
| | - Jonathan M Chase
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig Leipzig Germany.,Department of Computer Science, Martin Luther University, Halle, Germany Department of Computer Science, Martin Luther University Halle Germany
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11
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Foraging connections: Patterns of prey use linked to invasive predator diel movement. PLoS One 2018; 13:e0201883. [PMID: 30110360 PMCID: PMC6093679 DOI: 10.1371/journal.pone.0201883] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 07/24/2018] [Indexed: 11/19/2022] Open
Abstract
Invasive predators can profoundly impact native communities, especially in insular ecosystems where functionally equivalent predators were evolutionarily absent. Beyond direct consumption, predators can affect communities indirectly by creating or altering food web linkages among existing species. Where invasive predators consume prey from multiple distinct resource channels, novel links may couple the dynamics of disjunct modules and create indirect interactions between them. Our study focuses on invasive populations of Eleutherodactylus coqui (Anura: Leptodactylidae) on Hawaii Island. Coqui actively forage in the understory and lower canopy at night but return to the forest floor and belowground retreats by day. Recent dietary studies using gut contents and naturally occurring stable isotopes indicate higher than expected consumption of litter arthropods, which in these Hawaiian forests are primarily non-native species. We used laboratory studies to observe diurnal and nocturnal foraging behavior, and experimental field additions of C4 vegetation as a litter tracer to distinguish epigaeic sources from food web pools in the C3 canopy. Lab trials revealed that prey consumption during diurnal foraging was half that consumed during nocturnal foraging. Analysis of δ13C isotopes showed incorporation of C4 carbon into litter arthropods within one month, and Bayesian mixing models estimated that 15–25% of the carbon in coqui tissue was derived from litter sources. These results support recent findings that E. coqui are not quiescent diurnally but instead actively forage. Such activity by a mobile invasive predator may introduce a novel linkage that integrates detrital and foliar resource pools, potentially distributing influences of invasive litter arthropods through the broader system to amplify impacts on native species.
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12
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Kennedy SR, Dawson TE, Gillespie RG. Stable isotopes of Hawaiian spiders reflect substrate properties along a chronosequence. PeerJ 2018; 6:e4527. [PMID: 29576984 PMCID: PMC5866714 DOI: 10.7717/peerj.4527] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 03/01/2018] [Indexed: 11/20/2022] Open
Abstract
The Hawaiian Islands offer a unique opportunity to test how changes in the properties of an isolated ecosystem are propagated through the organisms that occur within that ecosystem. The age-structured arrangement of volcanic-derived substrates follows a regular progression over space and, by inference, time. We test how well documented successional changes in soil chemistry and associated vegetation are reflected in organisms at higher trophic levels—specifically, predatory arthropods (spiders)—across a range of functional groups. We focus on three separate spider lineages: one that builds capture webs, one that hunts actively, and one that specializes on eating other spiders. We analyze spiders from three sites across the Hawaiian chronosequence with substrate ages ranging from 200 to 20,000 years. To measure the extent to which chemical signatures of terrestrial substrates are propagated through higher trophic levels, we use standard stable isotope analyses of nitrogen and carbon, with plant leaves included as a baseline. The target taxa show the expected shift in isotope ratios of δ15N with trophic level, from plants to cursorial spiders to web-builders to spider eaters. Remarkably, organisms at all trophic levels also precisely reflect the successional changes in the soil stoichiometry of the island chronosequence, demonstrating how the biogeochemistry of the entire food web is determined by ecosystem succession of the substrates on which the organisms have evolved.
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Affiliation(s)
- Susan R Kennedy
- Department of Environmental Science, Policy and Management, University of California, Berkeley, Berkeley, CA, United States of America
| | - Todd E Dawson
- Department of Environmental Science, Policy and Management, University of California, Berkeley, Berkeley, CA, United States of America.,Department of Integrative Biology, University of California, Berkeley, Berkeley, CA, United States of America
| | - Rosemary G Gillespie
- Department of Environmental Science, Policy and Management, University of California, Berkeley, Berkeley, CA, United States of America
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13
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Percy DM. Making the most of your host: the Metrosideros-feeding psyllids (Hemiptera, Psylloidea) of the Hawaiian Islands. Zookeys 2017:1-163. [PMID: 28325970 PMCID: PMC5345378 DOI: 10.3897/zookeys.649.10213] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 01/05/2017] [Indexed: 12/31/2022] Open
Abstract
The Hawaiian psyllids (Psylloidea, Triozidae) feeding on Metrosideros (Myrtaceae) constitute a remarkable radiation of more than 35 species. This monophyletic group has diversified on a single, highly polymorphic host plant species, Metrosiderospolymorpha. Eleven Metrosideros-feeding species included in the Insects of Hawaii by Zimmerman are redescribed, and an additional 25 new species are described. Contrary to previous classifications that placed the Metrosideros-feeders in two genera, Trioza Foerster, 1848 and Kuwayama Crawford, 1911, all 36 named species are placed in Pariaconus Enderlein, 1926; and the relationship of this genus to other Pacific taxa within the family Triozidae, and other Austro-Pacific taxa feeding on host plants in Myrtaceae is clarified. The processes of diversification in Pariaconus include shifts in galling habit, geographic isolation within and between islands, and preferences for different morphotypes of the host plant. Four species groups are recognized: the bicoloratus and minutus groups are free-living or form pit galls, and together with the kamua group (composing all of the Kauai species) form a basal assemblage; the more derived closed gall species in the ohialoha group are found on all major islands except Kauai. The diversification of Pariaconus has likely occurred over several million years. Within island diversification is exemplified in the kamua group, and within species variation in the ohialoha group, but species discovery rates suggest this radiation remains undersampled. Mitochondrial DNA barcodes are provided for 28 of the 36 species. Genetic divergence, intraspecific genetic structure, and parallel evolution of different galling biologies and morphological traits are discussed within a phylogenetic framework. Outgroup analysis for the genus Pariaconus and ancestral character state reconstruction suggest pit-galling may be the ancestral state, and the closest outgroups are Palaearctic-Australasian taxa rather than other Pacific Metrosideros-feeders.
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Affiliation(s)
- Diana M Percy
- Department of Life Sciences, Natural History Museum, Cromwell Road, London, UK, and University of British Columbia, Faculty of Science, University Boulevard, Vancouver, BC, Canada
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14
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Rominger AJ, Merow C. meteR: an
r
package for testing the maximum entropy theory of ecology. Methods Ecol Evol 2016. [DOI: 10.1111/2041-210x.12625] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrew J. Rominger
- Environmental Science, Policy and Management University of California, Berkeley Berkeley CA 94720 USA
| | - Cory Merow
- Ecology and Evolutionary Biology University of Connecticut Storrs CT 06269 USA
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15
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Metcalfe DB, Crutsinger GM, Kumordzi BB, Wardle DA. Nutrient fluxes from insect herbivory increase during ecosystem retrogression in boreal forest. Ecology 2016; 97:124-32. [PMID: 27008782 DOI: 10.1890/15-0302.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Ecological theory, developed largely from ungulates and grassland systems, predicts that herbivory accelerates nutrient cycling more in productive than unproductive systems. This prediction may be important for understanding patterns of ecosystem change over time and space, but its applicability to other ecosystems and types of herbivore remain uncertain. We estimated fluxes of nitrogen (N) and phosphorus (P) from herbivory of a common tree species (Betula pubescens) by a common species of herbivorous insect along a -5000-yr boreal chronosequence. Contrary to established theory, fluxes of N and P via herbivory increased along the chronosequence despite a decline in plant productivity. The herbivore-mediated N and P fluxes to the soil are comparable to the main alternative pathway for these nutrients via tree leaf litterfall. We conclude that insect herbivores can make large contributions to nutrient cycling even in unproductive systems, and influence the rate and pattern of ecosystem development, particularly in systems with low external nutrient inputs.
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16
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Borregaard MK, Amorim IR, Borges PAV, Cabral JS, Fernández-Palacios JM, Field R, Heaney LR, Kreft H, Matthews TJ, Olesen JM, Price J, Rigal F, Steinbauer MJ, Triantis KA, Valente L, Weigelt P, Whittaker RJ. Oceanic island biogeography through the lens of the general dynamic model: assessment and prospect. Biol Rev Camb Philos Soc 2016; 92:830-853. [PMID: 26923215 DOI: 10.1111/brv.12256] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 01/28/2016] [Accepted: 02/02/2016] [Indexed: 01/06/2023]
Abstract
The general dynamic model of oceanic island biogeography (GDM) has added a new dimension to theoretical island biogeography in recognizing that geological processes are key drivers of the evolutionary processes of diversification and extinction within remote islands. It provides a dynamic and essentially non-equilibrium framework generating novel predictions for emergent diversity properties of oceanic islands and archipelagos. Its publication in 2008 coincided with, and spurred on, renewed attention to the dynamics of remote islands. We review progress, both in testing the GDM's predictions and in developing and enhancing ecological-evolutionary understanding of oceanic island systems through the lens of the GDM. In particular, we focus on four main themes: (i) macroecological tests using a space-for-time rationale; (ii) extensions of theory to islands following different patterns of ontogeny; (iii) the implications of GDM dynamics for lineage diversification and trait evolution; and (iv) the potential for downscaling GDM dynamics to local-scale ecological patterns and processes within islands. We also consider the implications of the GDM for understanding patterns of non-native species diversity. We demonstrate the vitality of the field of island biogeography by identifying a range of potentially productive lines for future research.
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Affiliation(s)
- Michael K Borregaard
- School of Geography and the Environment, University of Oxford, South Parks Road, OX1 3QY, Oxford, U.K.,Center for Macroecology, Evolution and Climate, National Museum of Natural History, University of Copenhagen, Universitetsparken 15, 2100, Copenhagen, Denmark
| | - Isabel R Amorim
- Departamento de Ciências Agrárias, cE3c - Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Universidade dos Açores, Rua Capitão João d'Ávila, São Pedro, 9700-042, Angra do Heroísmo, Terceira, Azores, Portugal
| | - Paulo A V Borges
- Departamento de Ciências Agrárias, cE3c - Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Universidade dos Açores, Rua Capitão João d'Ávila, São Pedro, 9700-042, Angra do Heroísmo, Terceira, Azores, Portugal
| | - Juliano S Cabral
- Biodiversity, Macroecology and Conservation Biogeography, University of Göttingen, Büsgenweg 1, 37077, Göttingen, Germany.,Synthesis Centre of the German Centre for Integrative Biodiversity Research (iDiv), Deutscher Platz 5e, 04103, Leipzig, Germany
| | - José M Fernández-Palacios
- Island Ecology and Biogeography Research Group, Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias (IUETSPC), Universidad de La Laguna, Tenerife, Canary Islands, 38206, Spain
| | - Richard Field
- School of Geography, University of Nottingham, NG7 2RD, Nottingham, U.K
| | - Lawrence R Heaney
- Field Museum of Natural History, 1400 S Lake Shore Drive, Chicago, IL, 60605, U.S.A
| | - Holger Kreft
- Biodiversity, Macroecology and Conservation Biogeography, University of Göttingen, Büsgenweg 1, 37077, Göttingen, Germany
| | - Thomas J Matthews
- School of Geography and the Environment, University of Oxford, South Parks Road, OX1 3QY, Oxford, U.K.,Departamento de Ciências Agrárias, cE3c - Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Universidade dos Açores, Rua Capitão João d'Ávila, São Pedro, 9700-042, Angra do Heroísmo, Terceira, Azores, Portugal
| | - Jens M Olesen
- Department of Bioscience - Genetics, Ecology and Evolution, Aarhus University, Ny Munkegade 114.2, DK-8000, Aarhus C, Denmark
| | - Jonathan Price
- Department of Geography and Environmental Studies, University of Hawaii at Hilo, 200 West Kawili Street, Hilo, HI, 96720, U.S.A
| | - Francois Rigal
- Departamento de Ciências Agrárias, cE3c - Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Universidade dos Açores, Rua Capitão João d'Ávila, São Pedro, 9700-042, Angra do Heroísmo, Terceira, Azores, Portugal.,Environment and Microbiology Team, Université de Pau et des Pays de l'Adour, IPREM UMR CNRS 5254, BP 1155, 64013, Pau Cedex, France
| | - Manuel J Steinbauer
- Section for Ecoinformatics & Biodiversity, Department of Bioscience, Aarhus University, Ny Munkegade 116, 8000, Aarhus, Denmark
| | - Konstantinos A Triantis
- School of Geography and the Environment, University of Oxford, South Parks Road, OX1 3QY, Oxford, U.K.,Departamento de Ciências Agrárias, cE3c - Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Universidade dos Açores, Rua Capitão João d'Ávila, São Pedro, 9700-042, Angra do Heroísmo, Terceira, Azores, Portugal.,Department of Ecology and Taxonomy, Faculty of Biology, National and Kapodistrian University, GR-15784, Athens, Greece
| | - Luis Valente
- Unit of Evolutionary Biology/Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Haus 26, D-14476, Potsdam, Germany
| | - Patrick Weigelt
- Biodiversity, Macroecology and Conservation Biogeography, University of Göttingen, Büsgenweg 1, 37077, Göttingen, Germany
| | - Robert J Whittaker
- School of Geography and the Environment, University of Oxford, South Parks Road, OX1 3QY, Oxford, U.K.,Center for Macroecology, Evolution and Climate, National Museum of Natural History, University of Copenhagen, Universitetsparken 15, 2100, Copenhagen, Denmark
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17
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Gillespie RG. Island time and the interplay between ecology and evolution in species diversification. Evol Appl 2015; 9:53-73. [PMID: 27087839 PMCID: PMC4780372 DOI: 10.1111/eva.12302] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 07/30/2015] [Indexed: 01/12/2023] Open
Abstract
Research on the dynamics of biodiversity has progressed tremendously over recent years, although in two separate directions – ecological, to determine change over space at a given time, and evolutionary, to understand change over time. Integration of these approaches has remained elusive. Archipelagoes with a known geological chronology provide an opportunity to study ecological interactions over evolutionary time. Here, I focus on the Hawaiian archipelago and summarize the development of ecological and evolutionary research; I emphasize spiders because they have attributes allowing analysis of ecological affinities in concert with diversification. Within this framework, I highlight recent insights from the island chronosequence, in particular the importance of (i) selection and genetic drift in generating diversity; (ii) fusion and fission in fostering diversification; and (iii) variability upon which selection can act. Insights into biodiversity dynamics at the nexus of ecology and evolution are now achievable by integrating new tools, in particular (i) ecological metrics (interaction networks, maximum entropy inference) across the chronosequence to uncover community dynamics and (ii) genomic tools to understand contemporaneous microevolutionary change. The work can inform applications of invasion and restoration ecology by elucidating the importance of changes in abundances, interaction strengths, and rates of evolutionary response in shaping biodiversity.
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Affiliation(s)
- Rosemary G Gillespie
- Department of Environmental Science, Policy, and Management University of California Berkeley CA USA
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18
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Harte J, Rominger A, Zhang W. Integrating macroecological metrics and community taxonomic structure. Ecol Lett 2015; 18:1068-77. [DOI: 10.1111/ele.12489] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 06/17/2015] [Accepted: 07/10/2015] [Indexed: 11/26/2022]
Affiliation(s)
- John Harte
- Energy and Resources Group; University of California at Berkeley; Berkeley CA 94720 USA
| | - Andrew Rominger
- Department of Environmental Science, Policy and Management; University of California at Berkeley; Berkeley CA 94720 USA
| | - Wenyu Zhang
- Department of Statistical Science; Cornell University; Ithaca NY 14850 USA
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19
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How does pedogenesis drive plant diversity? Trends Ecol Evol 2013; 28:331-40. [PMID: 23561322 DOI: 10.1016/j.tree.2013.02.008] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 02/20/2013] [Accepted: 02/21/2013] [Indexed: 11/20/2022]
Abstract
Some of the most species-rich plant communities occur on ancient, strongly weathered soils, whereas those on recently developed soils tend to be less diverse. Mechanisms underlying this well-known pattern, however, remain unresolved. Here, we present a conceptual model describing alternative mechanisms by which pedogenesis (the process of soil formation) might drive plant diversity. We suggest that long-term soil chronosequences offer great, yet largely untapped, potential as 'natural experiments' to determine edaphic controls over plant diversity. Finally, we discuss how our conceptual model can be evaluated quantitatively using structural equation modeling to advance multivariate theories about the determinants of local plant diversity. This should help us to understand broader-scale diversity patterns, such as the latitudinal gradient of plant diversity.
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20
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Roderick GK, Croucher PJP, Vandergast AG, Gillespie RG. Species Differentiation on a Dynamic Landscape: Shifts in Metapopulation Genetic Structure Using the Chronology of the Hawaiian Archipelago. Evol Biol 2012; 39:192-206. [PMID: 22707805 PMCID: PMC3364410 DOI: 10.1007/s11692-012-9184-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Accepted: 04/06/2012] [Indexed: 11/20/2022]
Abstract
Species formation during adaptive radiation often occurs in the context of a changing environment. The establishment and arrangement of populations, in space and time, sets up ecological and genetic processes that dictate the rate and pattern of differentiation. Here, we focus on how a dynamic habitat can affect genetic structure, and ultimately, differentiation among populations. We make use of the chronology and geographical history provided by the Hawaiian archipelago to examine the initial stages of population establishment and genetic divergence. We use data from a set of 6 spider lineages that differ in habitat affinities, some preferring low elevation habitats with a longer history of connection, others being more specialized for high elevation and/or wet forest, some with more general habitat affinities. We show that habitat preferences associated with lineages are important in ecological and genetic structuring. Lineages that have more restricted habitat preferences are subject to repeated episodes of isolation and fragmentation as a result of lava flows and vegetation succession. The initial dynamic set up by the landscape translates over time into discrete lineages. Further work is needed to understand how genetic changes interact with a changing set of ecological interactions amongst a shifting mosaic of landscapes to achieve species formation.
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Affiliation(s)
- George K. Roderick
- Department of Environmental Science, Policy, and Management, University of California, 130 Mulford Hall, Berkeley, CA 94720-3114 USA
| | - Peter J. P. Croucher
- Department of Environmental Science, Policy, and Management, University of California, 130 Mulford Hall, Berkeley, CA 94720-3114 USA
| | - Amy G. Vandergast
- U.S. Geological Survey, Western Ecological Research Center, San Diego Field Station, 4165 Spruance Road, Suite 200, San Diego, CA 92101 USA
| | - Rosemary G. Gillespie
- Department of Environmental Science, Policy, and Management, University of California, 130 Mulford Hall, Berkeley, CA 94720-3114 USA
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21
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Peltzer DA, Wardle DA, Allison VJ, Baisden WT, Bardgett RD, Chadwick OA, Condron LM, Parfitt RL, Porder S, Richardson SJ, Turner BL, Vitousek PM, Walker J, Walker LR. Understanding ecosystem retrogression. ECOL MONOGR 2010. [DOI: 10.1890/09-1552.1] [Citation(s) in RCA: 308] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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22
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Hyodo F, Wardle DA. Effect of ecosystem retrogression on stable nitrogen and carbon isotopes of plants, soils and consumer organisms in boreal forest islands. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:1892-1898. [PMID: 19462406 DOI: 10.1002/rcm.4095] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In the prolonged absence of catastrophic disturbance, ecosystem retrogression occurs, and this involves increased nutrient limitation, and reduced aboveground and belowground ecosystem processes rates. Little is known about how the nitrogen and carbon stable isotope ratios (delta(15)N and delta(13)C) of plants, soils and consumer organisms respond to retrogression in boreal forests. We investigated a 5000 year chronosequence of forested islands in the boreal zone of northern Sweden, for which the time since lightning-induced wildfire increases with decreasing island size, leading to ecosystem retrogression. For this system, tissue delta(15)N of three abundant plant species (Betula pubescens, Vaccinium myrtillus and Pleurozium schreberi) and humus all increased as retrogression proceeded. This is probably due to enhanced ecosystem inputs of N by biological fixation, and greater dependency of the plants on organic N during retrogression. The delta(13)C of B. pubescens and plant-derived humus also increased during retrogression, probably through nutrient limitation increasing plant physiological stress. Unlike the plants, delta(15)N of invertebrates (lycosid spiders and ants) did not increase during retrogression, probably because of their partial dependence on aquatic-derived prey that had a variable delta(15)N signature. The delta(13)C of the invertebrates increased as retrogression proceeded and converged towards that of an aquatic prey source (chironomid flies), suggesting increased dependence on aquatic-derived prey during retrogression. These results show that measurement of delta(15)N and delta(13)C of plants, soils, and consumers across the same environmental gradient can provide insights into environmental factors that drive both the aboveground and belowground subsystems, as well as the linkages between them.
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Affiliation(s)
- Fujio Hyodo
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, S901 83 Umeå, Sweden.
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23
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Crutsinger GM, Sanders NJ, Albrectsen BR, Abreu IN, Wardle DA. Ecosystem retrogression leads to increased insect abundance and herbivory across an island chronosequence. Funct Ecol 2008. [DOI: 10.1111/j.1365-2435.2008.01435.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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24
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Krushelnycky PD, Gillespie RG. Compositional and functional stability of arthropod communities in the face of ant invasions. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2008; 18:1547-1562. [PMID: 18767628 DOI: 10.1890/07-1293.1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
There is a general consensus that the diversity of a biotic community can have an influence on its stability, but the strength, ubiquity, and relative importance of this effect is less clear. In the context of biological invasions, diversity has usually been studied in terms of its effect on a community's invasibility, but diversity may also influence stability by affecting the magnitude of compositional or functional changes experienced by a community upon invasion. We examined the impacts of invasive ants on arthropod communities at five natural area sites in the Hawaiian Islands, and assessed whether differences among sites in community diversity and density variables were related to measures of stability. Ant invasion was usually associated with significant changes in overall community composition, as measured by Bray-Curtis distances, particularly among endemic subsets of the communities. Changes in mean species richness were also strong at three of the five sites. Among sites, diversity was negatively related to stability as measured by resistance to overall compositional change, but this effect could not be separated from the strong negative effect of invasive ant density on compositional stability. When compositional stability was measured as proportional change in richness, the best predictor of stability among endemic community subsets was endemic richness, with richer communities losing proportionately more species than species-poor communities. This effect was highly significant even after controlling for differences in invasive ant density and suggested that communities that had already lost many endemic species were resistant to further species loss upon ant invasion, while more intact communities remained vulnerable to species loss. Communities underwent strong but idiosyncratic functional shifts in association with ant invasion, both in terms of trophic structure and total arthropod biomass. There were no apparent relationships, however, between functional stability and community diversity or density measures. Instead, invasive ant density was the best among-site predictor of the magnitude of functional change. Overall, diversity appeared to be a poor predictor of stability in the face of ant invasion in these communities, possibly because any actual diversity effects were overshadowed by community-specific factors and variation in the magnitude of the ant-mediated perturbation.
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Affiliation(s)
- Paul D Krushelnycky
- Department of Environmental Science, Policy and Management, 137 Mulford Hall, University of California, Berkeley, California 94720-3114, USA.
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