Article
Phenotypic plasticity in response to breeding density in tree swallows: an adaptive maternal effect?
Hormones and behavior - 1 Sept 2013
Bentz Alexandra B, Navara Kristen J, Siefferman Lynn
Abstract excerpt
Territorial animals breeding in high-density environments are more likely to engage in aggressive competition with conspecifics for resources necessary for reproduction. In many avian species, increased competition among breeding females results in increased testosterone concentrations in egg yolks. Generally, elevated yolk testosterone increases nestling growth, competitive behaviors, and bold behavioral traits....
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