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Neural and behavioral evolution in an eavesdropper with a rapidly evolving host.

Aaron W Wikle1, E Dale Broder2, James H Gallagher3

  • 1University of Denver, Biology, 2199 S University Blvd, Denver, CO 80208, USA.

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Eavesdropping flies rapidly evolved their hearing to match new cricket songs, demonstrating how predators can drive communication evolution. This study shows rapid sensory evolution in an unintended receiver.

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Ormia ochraceaTeleogryllus oceanicusanimal communicationaudiogramfrequency tuningneuroethologyrapid evolution

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Area of Science:

  • Evolutionary biology
  • Animal communication
  • Behavioral ecology

Background:

  • Animal communication relies on signalers, receivers, and environment.
  • Unintended receivers (eavesdroppers) critically influence signal evolution.
  • Rapid, contemporary evolution of animal signals is rarely observed.

Purpose of the Study:

  • Investigate how receiver psychology evolves with new hosts and signals.
  • Understand the role of eavesdroppers in host-parasite coevolution.
  • Examine rapid sensory evolution in parasitoid flies and their hosts.

Main Methods:

  • Complementary laboratory and field experiments.
  • Analysis of neural auditory tuning and behavior in Ormia ochracea.
  • Behavioral assays on cricket song preferences in flies.

Main Results:

  • Ormia ochracea in Hawaii show evolved neural auditory tuning and behavior.
  • These adaptations facilitate detection of novel Hawaiian cricket songs.
  • Recently evolved cricket songs are variable, with specific spectral preferences in flies.

Conclusions:

  • This is the first evidence for rapid sensory tuning evolution in an eavesdropper.
  • Eavesdropper sensory evolution can drive host signal diversification.
  • Integrates sensory mechanisms, behavior, and signal evolution in host-parasite systems.