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An analytical synopsis of caddisfly (Insecta, Trichoptera) taxonomic history and progress in Canada and the United States.

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Consistent metacommunity structure despite inconsistent drivers of assembly at the continental scale.

David Murray-Stoker1, Kelly M Murray-Stoker1

  • 1Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada.

The Journal of Animal Ecology
|March 30, 2020
PubMed
Summary

Environmental factors primarily drive macroinvertebrate community assembly across the United States, revealing consistent metacommunity structures but varied regional influences on biodiversity. This highlights the importance of species sorting and hierarchical filtering in ecological systems.

Keywords:
National Rivers and Streams Assessmentbiodiversitybiogeographyboosted regression treescommunity assemblyelements of metacommunity structurefreshwater ecologymetacommunity

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Area of Science:

  • Ecology
  • Environmental Science
  • Biodiversity Research

Background:

  • Community ecology seeks to understand factors influencing species diversity and assembly.
  • Local (environmental) and regional (dispersal) factors are key, but their interplay is complex.
  • Previous studies have not consistently isolated the drivers of community assembly.

Purpose of the Study:

  • To identify metacommunity structure and diversity at a continental scale.
  • To determine the local and regional drivers of macroinvertebrate community assembly.
  • To assess how biodiversity scales across hierarchical levels and varies among ecoregions.

Main Methods:

  • Analyzed macroinvertebrate communities in 941 rivers and streams across the conterminous United States.
  • Employed pattern-based metacommunity analyses and boosted regression tree techniques.
  • Evaluated environmental, landscape, and network drivers of community assembly.

Main Results:

  • Consistent metacommunity structures were observed across the United States, with a Clementsian structure in each ecoregion.
  • Environmental variables were the primary drivers of community assembly, indicating species sorting and environmental filtering.
  • Influential environmental variables differed among ecoregions, suggesting hierarchical filtering.

Conclusions:

  • Community assembly exhibits contingencies despite consistent metacommunity structure.
  • Environmental control is crucial for community assembly and biodiversity.
  • Continental biodiversity is maintained by variations in assembly drivers and ecoregional compositional changes.