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• W3204280139 abstract "Abstract Testosterone mediates suites of physical and behavioral traits across vertebrates, and circulation varies considerably across and within taxa. However, an understanding of the causal factors of variation in circulating testosterone has proven difficult despite decades of research. According to the challenge hypothesis, agonistic interactions between males immediately prior to the breeding season produce the highest levels of testosterone measured during this period. While many studies have provided support for this hypothesis, most species do not respond to male-male competition by elevating testosterone. As a result, a recent revision of the hypothesis (‘challenge hypothesis 2.0’) places male-female interactions as the primary cause of rapid elevations in testosterone circulation in male vertebrates. Here, we offer a test of both iterations of the challenge hypothesis in a tropical bird species. We first illustrate that male White-shouldered Fairywrens ( Malurus alboscapulatus ) differ by subspecies in plasma testosterone concentrations. Then we use a social network approach to find that males of the subspecies with higher testosterone are characterized by greater social interaction scores, including more time aggregating to perform sexual displays. Next, we use a controlled experiment to test whether males respond to simulated territorial intrusion or courtship interaction contexts by elevating testosterone. Males sampled during courtship had greater plasma testosterone both relative to flushed controls and males sampled during simulated intrusion. Ultimately, our results are consistent with challenge hypothesis 2.0, as males rapidly elevated testosterone following interactions with females, but not during territorial challenges." @default.
• W3204280139 created "2021-10-11" @default.
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• W3204280139 date "2021-10-07" @default.
• W3204280139 modified "2023-09-26" @default.
• W3204280139 title "Male White-shouldered Fairywrens (<i>Malurus alboscapulatus</i>) elevate testosterone when courting females but not during territorial challenges" @default.
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• W3204280139 doi "https://doi.org/10.1101/2021.10.06.463071" @default.
• W3204280139 hasPublicationYear "2021" @default.
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