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- W2153913015 abstract "Abstract Multiple male traits and displays may act in signalling sexually selected processes during courtship. Spotless starling males ( Sturnus unicolor ) carry green plants into their nests before egg laying, and recent studies have shown that this behaviour is related to female breeding decisions and the production of male‐biased broods. Although the functional implications of this effect on females are not yet clear, data suggest that it could be mediated by female circulating hormones. Additionally, females may show higher androgen levels as a consequence of the increased female–female competition generated by the increase in male attractiveness. We tested this hypothesis using the same manipulation of green nesting material that has been previously shown to result in an increase of male attractiveness in male spotless starlings. We found that females in experimental nests increased their circulating testosterone levels during the laying period. In addition, there was an increase of social interferences in the experimental nests because of the addition of green plants. We hypothesise that testosterone may allow females to maintain their mating status when competing with other females for the preferred males. Addition of green plants also increased the variance in the levels of circulating testosterone, suggesting plasticity between females in their response to the manipulation. We propose that there is a functional link between high testosterone levels, male‐biased sex ratios and female resource‐holding potential in intra‐sexual competition in this species." @default.
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- W2153913015 date "2010-01-06" @default.
- W2153913015 modified "2023-10-16" @default.
- W2153913015 title "Experimental Addition of Green Plants to the Nest Increases Testosterone Levels in Female Spotless Starlings" @default.
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- W2153913015 doi "https://doi.org/10.1111/j.1439-0310.2009.01724.x" @default.
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