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Related Experiment Video

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A New Approach that Eliminates Handling for Studying Aggression and the "Loser" Effect in Drosophila melanogaster
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Morph matters: aggression bias in a polymorphic sparrow.

Brent M Horton1, Mark E Hauber, Donna L Maney

  • 1Department of Psychology, Emory University, Atlanta, Georgia, United States of America. bhorto2@emory.edu

Plos One
|November 3, 2012
PubMed
Summary
This summary is machine-generated.

White-throated sparrows adjust aggressive behavior based on opponent

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Area of Science:

  • Behavioral Ecology
  • Evolutionary Biology
  • Ornithology

Background:

  • Species with distinct morphs often display varied aggressive behaviors based on opponent phenotype.
  • Aggression bias is known in species under negative frequency-dependent selection, but less studied under other regimes.
  • White-throated sparrows (Zonotrichia albicollis) exhibit plumage dimorphism linked to disassortative mating and differing reproductive strategies.

Purpose of the Study:

  • To investigate aggression bias in white-throated sparrows based on intruder morph.
  • To determine if territorial aggression varies with the color morph of an intruder.
  • To understand the role of mating systems and reproductive strategies in shaping aggression bias.

Main Methods:

  • Conducted simulated territorial intrusions during peak breeding activity.
  • Observed and recorded territorial responses of resident birds to different intruder morphs.
  • Analyzed aggression bias in relation to resident and intruder color morphs and sex.

Main Results:

  • Both white-striped males and tan-striped females exhibited aggression bias, altering responses based on intruder morph.
  • Tan-striped males and white-striped females did not show significant aggression bias.
  • Aggression bias was observed in individuals at the extremes of the territorial aggression continuum.

Conclusions:

  • Aggression bias in white-throated sparrows is influenced by the morph of both resident and intruder.
  • The disassortative mating system and differing reproductive strategies likely contribute to morph-dependent fitness risks.
  • Aggression bias appears to be an adaptive response to varying threats to fitness in this polymorphic species.