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A Video Surveillance System to Monitor Breeding Colonies of Common Terns Sterna Hirundo
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ISOLATING MECHANISMS IN SEABIRDS.

Raymond Pierotti1

  • 1Department of Biology and Institute of Arctic Biology, University of Alaska, Fairbanks, AK, 99701.

Evolution; International Journal of Organic Evolution
|June 1, 2017
PubMed
Summary

Seabird coloration, specifically bill and foot color, acts as a key reproductive isolating mechanism. Differences in these traits prevent hybridization, while similarities lead to interbreeding in sympatric species.

Area of Science:

  • Ornithology
  • Evolutionary Biology
  • Animal Behavior

Background:

  • Bird species often use plumage or song for reproductive isolation.
  • Seabirds, with drab plumage and limited vocalizations, rely on other traits.
  • Previous theories on eye-color contrast have been challenged by hybridization evidence in gulls.

Purpose of the Study:

  • To investigate the role of phenotypic attributes, particularly coloration, in seabird reproductive isolation.
  • To test the hypothesis that bill and foot coloration function as isolating mechanisms in sympatric seabird species.

Main Methods:

  • Examined over 100 seabird species breeding in sympatry with congeners.
  • Assessed the coloration of bills and feet in relation to observed hybridization patterns.

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Main Results:

  • Species with similar bill and foot coloration hybridized extensively where they co-occurred.
  • Species with dissimilar bill or foot coloration either did not hybridize or produced rare, non-viable hybrids.
  • Bill and foot color differences appear to be primary isolating mechanisms for surface-nesting seabirds.

Conclusions:

  • Bill and foot coloration are critical for reproductive isolation in many seabirds.
  • Foot color may supplement bill color in mate choice and maintaining species boundaries.
  • Coloration serves as a vital, yet often overlooked, factor in avian speciation.