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Male attractiveness and differential testosterone investment in zebra finch eggs.
TLDR
This study shows that female birds deposit higher amounts of testosterone and 5alpha-dihydrotestosterone in their eggs when mated to more attractive males.
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Chapter 7 Hormones in Avian Eggs: Physiology, Ecology and Behavior
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Nestling immunocompetence and testosterone covary with brood size in a songbird
TLDR
Following the development of zebra finch chicks that were cross–fostered and raised in different brood sizes provided experimental evidence that levels of circulating testosterone in nestlings can be influenced by their physiological response to environmental conditions.
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Song characteristics are age dependent in the willow warbler, Phylloscopus trochilus
TLDR
It is inferred that the development of several song characteristics is costly in this species because of the different results provided by the two methods for element rate, which suggest a negative correlation between element rate and the probability of survival.
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Female canaries produce eggs with greater amounts of testosterone when exposed to preferred male song
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Correlated evolution of male and female testosterone profiles in birds and its consequences
TLDR
A review of the literature revealed that intense directional selection for high levels of circulating testosterone in birds is likely to be mainly due to direct selection on males, and that any costs of high testosterone levels in females are particularly likely in colonial birds.
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Early condition, song learning, and the volume of song brain nuclei in the zebra finch (Taeniopygia guttata).
TLDR
The results provide no evidence for song learning to be limited by nestling condition during the period of nutritional dependence from the parents in the zebra finch.
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Elevated yolk androgen levels benefit offspring development in a between-clutch context
TLDR
It is hypothesized that yolk hormone deposition could be costly for females or alternatively that potential negative effects later in adulthood may constrain maternal hormone allocation, and no evidence that the observed effects depended on the environment under which it was investigated is found.
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Negative effects of elevated testosterone on female fecundity in zebra finches
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Yolk androgens in the barn swallow (Hirundo rustica): a test of some adaptive hypotheses
TLDR
Experimental support is found for the hypothesis that female yolk androgen allocation depends on mate attractiveness and that it constitutes an example of differential allocation in birds, and correlative evidence of a direct relationship between egg androgen concentration and performance of offspring as measured by mass increase is found.
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