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Denon Start1

  • 1Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S3B2, Canada denon.start@mail.utoronto.ca.

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Summary
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Macroevolutionary history shapes species traits and ecological interactions. This study shows how evolutionary transitions influence dragonfly larvae behavior, impacting prey, communities, and ecosystem function.

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Area of Science:

  • Ecology and Evolutionary Biology
  • Macroevolutionary Studies
  • Ecosystem Functioning

Background:

  • Ecology influences evolution, and evolution shapes ecological patterns.
  • Macroevolutionary transitions can lead to species phenotypic differences.
  • These differences impact species interactions, community assembly, and ecosystem functioning.

Purpose of the Study:

  • To investigate how macroevolutionary transitions affect species interactions and ecosystem functioning.
  • To test the hypothesis that macroevolutionary history predicts ecological impacts.
  • To examine the role of repeated speciation in creating similar ecological patterns.

Main Methods:

  • Conducted experiments using dragonfly larvae from different pond habitats (with fish, without fish, or both).
  • Assessed behavioral differences in dragonfly larvae based on their habitat history.
  • Analyzed impacts on prey abundance, community composition, and trophic cascades.

Main Results:

  • Macroevolutionary transitions resulted in more active fishless pond dragonfly larvae compared to fish pond specialists.
  • Increased activity led to reduced prey abundance and altered prey community structure.
  • These changes amplified trophic cascades and influenced ecosystem multi-functioning.

Conclusions:

  • Macroevolutionary history has predictable impacts on phenotypic traits.
  • These trait changes have significant consequences for species interactions and ecosystem processes.
  • Evolutionary history is a key factor in understanding current ecological patterns and ecosystem functioning.