A test of the condition-bias hypothesis using brown-headed cowbirds trapped during the breeding season

K. W. Dufour, Patrick J Weatherhead

Research output: Contribution to journalArticlepeer-review

Abstract

Examined trap bias relative to body condition, age, and sex using data collected from Molothrus ater decoy trapped. Decoy-trapped birds were in poor condition relative to those caught by mist net in an adjacent roost. Paradoxically, however, males in better condition when first trapped were more likely to be recaptured in the same season, possibly reflecting more widespread movement, and hence fewer encounters with traps, by birds in poor condition. Hatching-year birds were more likely than adults to be recaptured in the same season. Trapped samples were strongly male biased, which probably reflects a difference in nutritional requirements, and thus foraging strategies, between males and females, during the breeding season. -from Authors

Original languageEnglish (US)
Pages (from-to)2686-2692
Number of pages7
JournalCanadian journal of zoology
Volume69
Issue number10
DOIs
StatePublished - Jan 1 1991
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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