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Factors controlling community structure in heterogeneous metacommunities
Kendi F Davies1, Marcel Holyoak, Kim A Preston
1Department of Environmental Science and Policy, University of California, Davis, CA 95616, USA. kendi.davies@colorado.edu
The Journal of Animal Ecology
|May 22, 2009
Summary
Fixed spatial heterogeneity boosts protist community diversity through species sorting. It also alters local community structure via mass effects when combined with dispersal, demonstrating key mechanisms of biodiversity change.
Area of Science:
- Ecology
- Community Ecology
- Biodiversity Research
Background:
- Environmental heterogeneity is a key factor in modern species coexistence theories.
- Observational studies highlight heterogeneity's role, but experimental evidence on its impact on community diversity and structure is limited.
- Understanding the precise mechanisms by which spatial heterogeneity influences ecological communities is crucial.
Purpose of the Study:
- To experimentally evaluate how fixed spatial heterogeneity affects community diversity and structure.
- To elucidate the specific mechanisms through which spatial heterogeneity influences ecological communities.
- To compare the relative importance of heterogeneity versus non-spatial mechanisms in driving diversity.
Main Methods:
- Conducted experiments using protist communities in controlled environments.
- Manipulated fixed spatial heterogeneity to assess its effects on diversity and community composition.
- Analyzed the roles of species sorting and mass effects in response to heterogeneity and dispersal.
Main Results:
- Non-spatial mechanisms accounted for a significant portion of baseline community diversity.
- Fixed spatial heterogeneity led to modest but predictable increases in metacommunity diversity via species sorting.
- Heterogeneity and dispersal interact to modify local community structure (species composition and abundance) through mass effects.
Conclusions:
- Spatial heterogeneity is not universally the dominant driver of diversity.
- Experimental evidence confirms species sorting as a mechanism increasing diversity under heterogeneity.
- Mass effects, driven by heterogeneity and dispersal, demonstrably alter local community structure.
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