We observed that birds treated with corticosterone exhibited a significant decrease in broad-sense genetic variance of tarsus length, and an increase in this component in body mass on the 2nd day post-hatching. Our experimental setup allowed for full crossing of genetic and rearing effects with the experimental manipulation. We manipulated the levels of steroid hormones (testosterone and corticosterone) in eggs laid by blue tits in a wild population. hormones) may influence the expression of genetic variance in quantitative traits in the offspring. In this study we attempt to experimentally test the hypothesis that maternally transmitted agents (e.g. One of possible environment-sensitive modulators of observed levels of genetic variance are maternal effects. In particular, we still are to understand why genetic variances often depend on environmental conditions. However, we know very little about processes that modulate its levels in wild populations. Genetic variation is one of the key concepts in evolutionary biology and an important prerequisite of evolutionary change.
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