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Hormonal regulation of male reproductive phenotype in a cooperatively breeding tropical bird.

机译：在合作繁殖的热带鸟类中雄性生殖表型的激素调控。

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摘要

Androgens regulate male reproductive behaviour and may be a mechanistic link between sexual signals and physiological condition. However, the role of these hormones in regulating pre-nuptial moult and male plumage signals of passerine birds is unclear. In the red-backed fairy-wren ( Malurus melanocephalus), plumage colour is a sexually selected trait and males exhibit three reproductive phenotypes. Males can breed in red and black plumage, breed in brown plumage, or assume brown plumage and act as non-breeding auxiliaries: each phenotype differs in parental and reproductive behaviour. We found that both plasma androgen concentrations and body condition differed significantly among male phenotypes, with red/black breeding males having the highest androgen levels and best condition and auxiliaries the lowest levels and poorest condition. These differences were present during the pre-nuptial moult when nuptial plumage is acquired and androgen concentrations were positively correlated with body condition at that time.;While androgens appear to be involved in regulating these alternative reproductive phenotypes, their function may be mediated by the avian glucocorticoid stress hormone, corticosterone (CORT). We tested the hypothesis that CORT regulates breeding status by suppressing breeding in auxiliary males and mediating the relationship between body condition, testosterone, and production of plumage signals. Contrary to our predictions, subordinate auxiliary males and dominant red/black breeding males had similar levels of baseline CORT. Additionally, we found no correlation between CORT and body condition and a positive rather than negative association between molting male CORT and androgens. Thus, honesty of male red-backed fairy-wren plumage signals may be enforced by the relationship between body condition and androgens without the mediating influence of CORT.;Finally, we experimentally tested the hypothesis that red/black plumage color is testosterone (T: androgen) dependent using T, control, and anti-T implants. We found that, relative to controls, both T and anti-T treatment stimulated early onset of the pre-nuptial molt, lead to the production of bright plumage, influenced feather length, and differentially effected body morphology. Across all combined characters, anti-T males produced an intermediate phenotype to T and control males. Thus, bright plumage production is T dependent but T may not be the only hormonal mechanism functioning.
机译：雄激素调节男性生殖行为，可能是性信号与生理状况之间的机械联系。但是，这些激素在调节雀形目鸟类婚前蜕皮和雄性羽毛信号中的作用尚不清楚。在红背神fairy（Malurus melanocephalus）中，羽毛颜色是一种性选择的特征，雄性表现出三种生殖表型。雄性可以繁殖成红色和黑色的羽毛，繁殖成棕色的羽毛，或承担棕色的羽毛，并充当非繁殖辅助剂：每种表型在亲代和生殖行为上都不同。我们发现男性表型之间的血浆雄激素浓度和身体状况均存在显着差异，其中红色/黑色繁殖雄性的雄激素水平最高，状况最佳，而助剂水平最低，状况最差。这些差异存在于婚前换毛期，当时获得了羽毛，并且雄激素浓度与当时的身体状况呈正相关。；尽管雄激素似乎参与调节这些替代性生殖表型，但它们的功能可能是由禽类介导的。糖皮质激素应激激素，皮质酮（CORT）。我们检验了CORT通过抑制辅助雄性的繁殖并介导身体状况，睾丸激素和羽毛信号产生之间的关系来调节繁殖状态的假设。与我们的预测相反，下属辅助雄性和显性红/黑育种雄性的基线CORT水平相似。此外，我们发现CORT与身体状况之间无相关性，而蜕皮的男性CORT与雄激素之间呈正相关而非负相关。因此，人体状况和雄激素之间的关系可能会在不依赖CORT的中介影响的情况下增强男性红背神仙羽毛信息的诚实性;最后，我们通过实验验证了红/黑羽毛颜色是睾丸激素的假设（T：雄激素）依赖于T，对照和抗T植入物。我们发现，相对于对照，T和抗T处理均能刺激婚前蜕皮的早期发作，导致产生明亮的羽毛，影响羽毛长度，并影响身体形态。在所有组合特征中，抗-T雄性产生相对于T和对照雄性的中间表型。因此，明亮的羽毛产生是依赖于T的，但是T可能不是唯一的激素机制。

著录项

  • 作者

    Lindsay, Willow Rosella.;

  • 作者单位

    Washington State University.;

  • 授予单位 Washington State University.;
  • 学科 Zoology.;Ecology.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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