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Plant-associate interactions and diversification across trophic levels.

Jeremy B Yoder1, Albert Dang1, Caitlin MacGregor1

  • 1Department of Biology California State University Northridge Northridge CA 91330 USA.

Evolution Letters
|October 18, 2022
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Summary
This summary is machine-generated.

Species interactions drive diversification. Genetic structure of associated species often mirrors their hosts, especially in antagonistic relationships, revealing mechanisms of speciation.

Keywords:
Herbivorylocal adaptationmutualismparasitismpopulation structure

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Population Genetics

Background:

  • Species interactions are key drivers of biodiversity.
  • Mechanisms by which interactions promote speciation are not fully understood.
  • Different interaction types may have varied impacts on diversification.

Purpose of the Study:

  • Investigate how species interactions influence diversification.
  • Test the link between host and associate population genetic structure.
  • Differentiate effects of antagonistic versus mutualistic interactions.

Main Methods:

  • Compiled population genetic studies of host plants and associated species (herbivores, parasites, mutualists).
  • Employed Bayesian multiple regressions and the BEDASSLE modeling framework.
  • Accounted for geographic distance and shared environmental variation.

Main Results:

  • Associate population genetic structure frequently paralleled host population genetic structure.
  • This correlation persisted even after controlling for geography and climate.
  • Antagonistic interactions showed a stronger link between associate and host genetic structure than mutualistic ones.

Conclusions:

  • Species interactions, particularly antagonistic ones, significantly shape population genetic structure and promote diversification.
  • Local adaptation in antagonistic interactions and host geographic distribution in mutualistic interactions are key drivers.
  • Findings support coevolutionary theory regarding interaction-driven speciation.