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- W4245754025 abstract "Abstract Evolutionary theory predicts that heritability of fitness-related traits should be low. Egg size in birds is a fitness-related trait, but exhibits high heritability. One possible explanation for the apparent failure of natural selection to exhaust variability is that variation in egg size is mediated by female condition. In this study, we estimated repeatability of egg size within and between successive clutches in a wild, double-brooded population of House Wrens (Troglodytes aedon) in central Illinois, and examined the relationship of egg size with female size and condition. Repeatability of egg volume and mass in individual birds was high within years and between successive years (>0.77), suggesting a substantial heritable component to variation in egg size. However, egg mass was also significantly correlated with female condition. We suggest that the high repeatability values largely reflect permanent but nongenetic (ontogenetic) variation in egg size among females, which is reflected in the positive correlation of egg size with female condition. If variation in egg size is attributable to a combination of nonheritable, ontogenetic variation and variation due to current environmental conditions among females, then selection may not produce an evolutionary response in egg size." @default.
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- W4245754025 date "2002-07-01" @default.
- W4245754025 modified "2023-10-17" @default.
- W4245754025 title "Sources of Egg-Size Variation in House Wrens (Troglodytes Aedon): Ontogenetic and Environmental Components" @default.
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- W4245754025 doi "https://doi.org/10.1093/auk/119.3.800" @default.
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