期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 277, 期 1695, 页码 2875-2883出版社
ROYAL SOC
DOI: 10.1098/rspb.2010.0480
关键词
American crows; body condition; disease; immunocompetence; inbreeding; inbreeding depression
资金
- National Science Foundation
- National Institute of Health
- Animal Behaviour Society
- Cornell Sigma Xi
- Frank M. Chapman Memorial Fund
- Cooper Ornithological Society
- Wilson Ornithological Society
- Andrew W. Mellon Foundation
- Sigma Delta Epsilon/Graduate Women in Science
- American Association of University Women
Cooperatively breeding American crows (Corvus brachyrhynchos) suffer a severe disease-mediated survival cost from inbreeding, but the proximate mechanisms linking inbreeding to disease are unknown. Here, we examine indices of nestling body condition and innate immunocompetence in relationship to inbreeding and disease mortality. Using an estimate of microsatellite heterozygosity that predicts inbreeding in this population, we show that inbred crows were in relatively poor condition as nestlings, and that body condition index measured in the first 2-33 days after hatching, in addition to inbreeding index, predicted disease probability in the first 34 months of life. Inbred nestlings also mounted a weaker response along one axis of innate immunity: the proportion of bacteria killed in a microbiocidal assay increased as heterozygosity index increased. Relatively poor body condition and low innate immunocompetence are two mechanisms that might predispose inbred crows to ultimate disease mortality. A better understanding of condition-mediated inbreeding depression can guide efforts to minimize disease costs of inbreeding in small populations.
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