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Deep biogeographic barriers explain divergent global vertebrate communities

Author

Listed:
  • Peter J. Williams

    (Michigan State University
    Michigan State University
    University of Montana)

  • Elise F. Zipkin

    (Michigan State University
    Michigan State University)

  • Jedediah F. Brodie

    (University of Montana
    University of Montana
    Universiti Malaysia Sarawak)

Abstract

Biogeographic history can lead to variation in biodiversity across regions, but it remains unclear how the degree of biogeographic isolation among communities may lead to differences in biodiversity. Biogeographic analyses generally treat regions as discrete units, but species assemblages differ in how much biogeographic history they share, just as species differ in how much evolutionary history they share. Here, we use a continuous measure of biogeographic distance, phylobetadiversity, to analyze the influence of biogeographic isolation on the taxonomic and functional diversity of global mammal and bird assemblages. On average, biodiversity is better predicted by environment than by isolation, especially for birds. However, mammals in deeply isolated regions are strongly influenced by isolation; mammal assemblages in Australia and Madagascar, for example, are much less diverse than predicted by environment alone and contain unique combinations of functional traits compared to other regions. Neotropical bat assemblages are far more functionally diverse than Paleotropical assemblages, reflecting the different trajectories of bat communities that have developed in isolation over tens of millions of years. Our results elucidate how long-lasting biogeographic barriers can lead to divergent diversity patterns, against the backdrop of environmental determinism that predominantly structures diversity across most of the world.

Suggested Citation

  • Peter J. Williams & Elise F. Zipkin & Jedediah F. Brodie, 2024. "Deep biogeographic barriers explain divergent global vertebrate communities," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46757-z
    DOI: 10.1038/s41467-024-46757-z
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    References listed on IDEAS

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    3. W. Jetz & G. H. Thomas & J. B. Joy & K. Hartmann & A. O. Mooers, 2012. "The global diversity of birds in space and time," Nature, Nature, vol. 491(7424), pages 444-448, November.
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