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Related Experiment Videos

Does predation select for or against avian coloniality? A comparative analysis.

S A M Varela1, E Danchin, R H Wagner

  • 1Laboratoire du Fonctionnement et Evolution des Systèmes Ecologiques, Université Pierre et Marie Curie, CNRS - UMR 7625, Paris, France. varcela@cict.fr

Journal of Evolutionary Biology
|June 23, 2007
PubMed
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Coloniality in birds does not always reduce predation risk. This study found that colonial nesting may attract predators, increasing vulnerability, rather than providing safety for bird species.

Area of Science:

  • Evolutionary Biology
  • Ornithology
  • Behavioral Ecology

Background:

  • Predation is a key factor influencing the evolution of animal behavior.
  • Coloniality in birds is a widespread breeding strategy with debated anti-predation benefits.
  • Some evidence suggests colonies attract predators, while others propose they offer protection.

Purpose of the Study:

  • To test the reduced predation hypothesis (coloniality as protection) versus the increased predation hypothesis (coloniality as a risk).
  • To investigate the evolutionary relationship between colonial breeding and predation vulnerability in birds.
  • To determine if coloniality primarily deters or attracts predators.

Main Methods:

  • Comparative analysis of 363 species within the avian order Ciconiiformes.

Related Experiment Videos

  • Utilized Pagel's general method for discrete variable comparative analysis.
  • Assessed species' predation vulnerability based on nest location and physical characteristics.

    • Main Results:

    • A correlation between coloniality and predation vulnerability was confirmed.
    • The reduced predation hypothesis predictions were not supported.
    • The increased predation hypothesis predictions were supported, indicating coloniality can increase risk.

    Conclusions:

    • Colonial breeding in Ciconiiformes does not consistently offer protection from predators.
    • The evolution of coloniality may be linked to increased, not decreased, predation risk.
    • Species that are both colonial and vulnerable face significant predation pressure.