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© 1998 International Society for Behavioral Ecology

research-article

Are inbred offspring less fit? Survival in a natural population of Mexican jays

Jerram L. Brown and Esther R. Brown

Department of Biological Sciences, State University of New York Albany, NY 12222, USA

ABSTRACT

The importance of inbreeding avoidance for the fitness of individuals is currently undergoing reevahation. Especially when the frequency of inbreeding is low, it may be difficult to accumulate sufficient information. In a long-term study of the Mexican jay (Aphelocoma ultamarina) in Arizona, we found inbreeding, as determined by pedigree, to be rare even though this species exhibits strong natal philopatry and commonly lives in social groups of close relatives. Brood sizes of inbred pairs were significantly lower than those of outbred pairs, suggesting hatching failure; but there was no difference in die probability that one or more young would fledge from a nest. Survival of inbred nestlings to die next year was significantly lower than that of outbred nestlings.

Key words: Aphelocoma ultramarma, coefficient of inbreeding, inbreeding, inbreeding depression, jay, Mexican jay, reproductive success, survival.


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