期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 25, 期 3, 页码 584-590出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1420-9101.2011.02445.x
关键词
condition dependence; genetic diversity; parasite load; parent-offspring heterozygosity
资金
- Swiss National Science Foundation
Positive correlations between heterozygosity and fitness traits are frequently observed, and it has been hypothesized, but rarely tested experimentally, that parasites play a key role in mediating the heterozygosityfitness association. We evaluated this hypothesis in a wild great tit (Parus major) population by testing the prediction that the heterozygosityfitness association would appear in broods experimentally infested with a common ectoparasite, but not in parasite-free broods. We simultaneously assessed the effects of parental and offspring heterozygosity on nestling growth and found that body mass of nestlings close to independence, which is a strong predictor of post-fledging survival, increased significantly with nestling levels of heterozygosity in experimentally infested nests, but not in parasite-free nests. Heterozygosity level of the fathers also showed a significant positive correlation with offspring body mass under an experimental parasite load, whereas there was no correlation with the mothers level of heterozygosity. Thus, our results indicate a key role for parasites as mediators of the heterozygosityfitness correlations.
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