Genetic variation and causes of genotype-environment interaction in the body size of blue tit (Parus caeruleus).

Abstract excerpt

In several studies of natural populations of birds, the heritability of body size estimated by parent-offspring regression has been lower when offspring have developed in poor feeding regimens than when they developed in good feeding regimens. This has led to the suggestion that adaptation under poor regimens may be constrained by lack of genetic variation. We examined the influence of environmental conditions on...

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