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Predation against birds with low immunocompetence.

A P Møller1, J Erritzøe2

  • 1Laboratoire d'Ecologie, CNRS UMR 7625, Université Pierre et Marie Curie, 7 quai St. Bernard, Case 237, F-75252 Paris Cedex 05, France e-mail: amoller@hall.snv.jussieu.fr Tel.: +33-1-44272594, Fax: +33-1-44273516, , , , , , FR.

Oecologia
|March 18, 2017
PubMed
Summary

Predation selects for prey with weaker immune systems, indicated by smaller spleen size in birds killed by predators. This suggests disease and parasites are key factors in predator-prey dynamics.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Immunology

Background:

  • Predation intensity influences prey phenotype.
  • Prey in poor condition are expected to have inferior health.
  • Spleen size reflects immune function and immunocompetence.

Purpose of the Study:

  • To investigate if prey individuals exhibit poorer health status compared to conspecifics not preyed upon.
  • To test the hypothesis that predation selects for individuals with weaker immune systems.
  • To explore the role of disease and parasitism in predator-prey interactions.

Main Methods:

  • Comparative analysis of spleen size in 18 passerine bird species.
  • Model system using domestic cats (Felis catus) as predators.
  • Statistical comparison of spleen size between prey and non-prey individuals, controlling for confounding factors.
Keywords:
Key words Body conditionParasite-host interactionsPredator-prey interactionsPrey selectionSpleen

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Main Results:

  • Prey individuals consistently had smaller spleens than non-prey individuals.
  • No significant differences were found in sex, age, month of death, body mass, body condition, liver mass, wing length, or tarsus length between prey and non-prey.
  • Smaller spleen size in prey suggests a weaker immune system.

Conclusions:

  • Predation may disproportionately affect prey with compromised immune systems.
  • Disease and parasitism are indirectly implicated as significant factors in predator-prey relationships.
  • Spleen size serves as a reliable indicator of immune status in the context of predation selection.