Female ornamentation is associated with elevated aggression and testosterone in a tropical songbird
Female ornamentation is associated with elevated aggression and testosterone in a tropical songbird
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DOI：
10.1093/beheco/ary079
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发表时间：
2018-09-01
影响因子：
2.4
通讯作者：
Karubian, Jordan
中科院分区：
文献类型：
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作者：
Enbody, Erik D.;Boersma, Jordan;Karubian, Jordan
在雄性中，睾酮在装饰生产中起关键作用，并将装饰与生殖行为和其他性状联系起来，以产生综合表型。关于女性是否会将睾酮、强迫和攻击行为结合起来以实现女性特有的特征组合，人们知之甚少。雌性的装饰可能是与雄性装饰相关的结果，或者雌性性状可能是由于性别特异性选择压力的结果。在这些选择之间进行分辨对于理解选择在多大程度上作用于雌性性状是必要的。白肩细尾鹩莺（Malurus alboscapulatus）为解决这些问题提供了一个有用的背景，因为种群在雌性生殖（一种衍生性状）的程度上各不相同，而雄性生殖在两个种群中都是恒定的。我们发现，与未受干扰的雌性相比，受干扰的雌性具有更高水平的循环睾酮，并且对实验性领土入侵的反应更积极。这些研究结果是一致的想法，在女性白肩细尾莺，睾酮可能会机械地连接羽毛和行为特征，以产生一个综合的竞争表型，已报告的男性密切相关的物种。相比之下，男性的循环睾酮在人群之间没有显著差异。更广泛地说，我们的研究结果是一致的持续选择机制的女性装饰品，可能通过社会选择。
In males, testosterone plays a key role in ornament production and linking ornamentation with reproductive behaviors and other traits to produce an integrated phenotype. Less is known about whether females couple testosterone, ornamentation, and aggressive behaviors to achieve female-specific combinations of traits. Ornamentation in females may be the result of correlated expression with male ornamentation, or female traits could arise as the result of sex-specific selection pressures. Resolving between these alternatives is necessary to understand the degree to which selection acts on female traits. The White-shouldered Fairywren (Malurus alboscapulatus) provides a useful context to address these questions because populations vary in degree of female ornamentation, a derived trait, whereas male ornamentation is constant across both populations. We found that ornamented females have higher levels of circulating testosterone and respond more aggressively to experimental territorial intrusions than do unornamented females. These findings are consistent with the idea that, among female White-shouldered Fairywrens, testosterone may mechanistically link plumage and behavioral traits to produce an integrated competitive phenotype, as has been reported for males of closely related species. In contrast, circulating testosterone in males did not differ significantly between populations. More broadly, our findings are consistent with ongoing selection on the mechanisms underlying female ornaments, likely via social selection.