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Plant-herbivore coevolution and plant speciation.

John L Maron1, Anurag A Agrawal2, Douglas W Schemske3,4

  • 1Division of Biological Sciences, University of Montana, Missoula, Montana, 59812, USA.

Ecology
|March 28, 2019
PubMed
Summary
This summary is machine-generated.

Herbivores can drive plant speciation through coevolution, leading to adaptive radiation. This study proposes three scenarios where plant-herbivore interactions promote the evolution of new plant species.

Keywords:
plant defenseplant-herbivore coevolutionplant-insect cospeciationspeciationvicariance

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Area of Science:

  • Evolutionary Biology
  • Ecology
  • Botany

Background:

  • Ehrlich and Raven's "escape and radiate" model suggests novel plant defenses spur adaptive radiation.
  • Previous mechanisms for herbivore-mediated speciation lack generality.
  • An alternative view posits herbivores impose divergent selection, driving local adaptation and speciation.

Purpose of the Study:

  • To propose three distinct scenarios for herbivore-mediated plant speciation.
  • To explore the role of coevolution in plant speciation.
  • To identify outstanding research questions in plant-herbivore coevolution and speciation.

Main Methods:

  • Theoretical modeling of plant-herbivore interactions.
  • Review of existing literature on plant defense and speciation.
  • Proposal of three novel speciation scenarios.

Main Results:

  • Scenario 1: Vicariance, coevolution, and adaptive divergence.
  • Scenario 2: Colonization, defense loss, and re-evolution.
  • Scenario 3: New defense evolution, range expansion, and coevolution.

Conclusions:

  • Herbivore-driven coevolution is a significant factor in plant speciation.
  • Further research is needed on cospeciation, geographic variation in defenses, and character displacement.