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首页> 外文期刊>Zoological Science >Plasma Testosterone Levels Increase with Expression of Male Ornaments During Mating, but not Incubation, in Japanese Barn Swallows
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Plasma Testosterone Levels Increase with Expression of Male Ornaments During Mating, but not Incubation, in Japanese Barn Swallows

机译：血浆睾酮水平随着雄性饰物的表达而增加，但不孵化，在日本谷仓燕子中

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摘要

Recent experimental studies involving the manipulation of sexual traits have demonstrated that sexual trait expression feeds back to testosterone levels, perhaps via social interactions, reinforcing the linkage between sexual trait expression and testosterone levels during the mating period. However, information on this reinforcement under the natural variation of sexual traits remains limited. Using Japanese barn swallows, Hirundo rustica gutturalis, in which extra-pair paternity is quite rare (< 3%), we studied the relationship between plasma testosterone level and a male sexual trait, throat patch size, during the mating and incubation periods. Given the importance of social interaction, we predicted that this relationship should be intense during the mating period, but not the incubation period, due to reduced social interaction during the latter. We found low plasma testosterone levels during the incubation period compared with those in the mating period, and plasma testosterone levels were significantly positively related to throat patch area during the mating period, but not the incubation period. Similar relationships were found in another sexual trait, the size of white tail spots. During the incubation period, body condition, instead of male sexual trait expression, was negatively related to plasma testosterone level, indicating that an intrinsic link, rather than reinforcement, is important during this period. These relationships are consistent with the hypothesis that social interaction reinforces the relationship between sexual traits and plasma testosterone levels. The current study provides evidence for a highly variable relationship between testosterone and ornamentation across breeding periods in the natural variation of sexual traits.
机译：最近涉及性特征操纵的实验研究表明，性特征表达可能通过社会互动反馈到睾酮水平，从而加强性特征表达与交配期睾酮水平之间的联系。然而，在性特征的自然变异下，关于这种强化的信息仍然有限。我们使用日本仓燕Hirundo rustica gutturalis，研究了交配期和潜伏期血浆睾酮水平与雄性性特征、喉斑大小之间的关系。在日本仓燕中，额外的父子关系非常罕见（<3%）。考虑到社会互动的重要性，我们预测这种关系在交配期应该是强烈的，但在潜伏期不会，因为后者的社会互动减少。我们发现，与交配期相比，潜伏期的血浆睾酮水平较低，并且血浆睾酮水平与交配期的咽喉斑面积显著正相关，但与潜伏期无关。在另一种性特征——白尾斑的大小上也发现了类似的关系。在潜伏期，身体状况，而不是男性性特征表达，与血浆睾酮水平呈负相关，表明在这一时期，内在联系而非强化是重要的。这些关系与社会互动加强性特征与血浆睾酮水平之间关系的假设一致。目前的研究提供了证据，证明在性特征的自然变异中，睾丸激素和不同繁殖期的装饰之间存在高度可变的关系。

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