Plasma luteinizing hormone, steroid hormones, behavioral role, and nest stage in cooperatively breeding Harris' hawks (Parabuteo unicinctus)
Plasma luteinizing hormone, steroid hormones, behavioral role, and nest stage in cooperatively breeding Harris' hawks (Parabuteo unicinctus)
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合作繁殖哈里斯鹰 (Parabuteo unicinctus) 中的血浆黄体生成素、类固醇激素、行为作用和筑巢阶段
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发表时间：
1991
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影响因子：
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通讯作者：
J. Dawson
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作者：
Nora A. Mays;C. Vleck;J. Dawson
我们测量了亚利桑那州东南部合作繁殖哈里斯鹰（Parabuteo unicinctus）的成年繁殖者、成年羽毛帮助者和幼李年龄帮助者的睾酮（T）、雌二醇17 fl（E）、皮质酮和促黄体生成激素（LH）的血浆水平。在男性，成年繁殖者和大多数成年羽毛的助手有升高的T和LH在2月和3月，当筑巢发生，而大多数juvenal羽毛的助手显示LH，T，或E全年没有变化。因此，通常与繁殖者无关的成年羽毛帮手，在春天就已经准备好繁殖了。我们认为，这些帮手达到育种准备，因为潜在的好处，他们可以从偶尔成功的交配或可能达到的育种位置，使生殖准备有利。相比之下，大多数幼羽辅助者在它们的纳塔尔地帮助它们自己的父母，并且在生殖上还没有准备好繁殖，因此它们在生理上避免了近亲繁殖的可能性。一个例外是一个少年羽毛的男性助手，睾丸激素水平升高，他没有帮助他的父母。我们研究的雌性繁殖者在筑巢期间有升高的T，LH和E，而助手（成年和少年羽毛）在一年中的任何时候都没有显示海拔。在筑巢周期的早期，成年羽毛的雌性助手体重明显较轻（约100公斤）。10%），比饲养员。可能是身体状况差，从属地位的繁殖女性，或两者都与他们缺乏繁殖准备。在所有的鸟类，皮质酮水平增加处理时间，并在筑巢期间比非筑巢期间，但没有表现出一致的关系与助手或育种状态。与其他相对社会化、保持长期配对关系或分布于热带的物种一样，哈里斯鹰的LH和性类固醇血浆浓度即使升高，也相对较低。1990年5月10日收到，1991年1月13日接受。
We measured plasma levels of testosterone (T), estradiol 17fl (E), corticosterone, and luteinizing hormone (LH) in adult breeders, adult-plumaged helpers, and juvenal-plum- aged helpers of the cooperatively breeding Harris' Hawk (Parabuteo unicinctus) in southeastern Arizona. In the males, both adult breeders and most adult-plumaged helpers had elevated T and LH during February and March, when nest building occurs, whereas most juvenal- plumaged helpers showed no change in LH, T, or E throughout the year. Thus adult-plumaged helpers, usually not related to the breeders, are hormonally ready to breed in the spring. We suggest that these helpers attain breeding readiness because potential benefits they can derive from either occasional successful copulations or possible attainment of the breeding position make reproductive readiness advantageous. In contrast, most juvenal-plumaged helpers are aiding their own parents on their natal territory and are not hormonally ready to breed, and thus they physiologically avoid the potential for inbreeding. An exception to this was a juvenal-plumaged male helper with elevated testosterone levels who was not helping his parents. The female breeders we examined had elevated T, LH, and E during the nest-building period, whereas the helpers (both adult- and juvenal-plumaged) not show elevations at any time of the year. During the early part of the nesting cycle, the adult-plumaged female helpers weighed significantly less (ca. 10%) than the breeders. It is possible that poor body condition, subordinate status to the breeding females, or both were related to their lack of breeding readiness. In all birds, corticosterone levels increased with handling time, and were higher during the nesting periods than during non-nesting periods, but showed no consistent relation with helper or breeder status. As in other species that are relatively social, maintain long-term pair bonds, or are tropical in distribution, plasma concentrations of LH and sex steroids in Harris' Hawks, even when elevated, were relatively low. Received 10 May 1990, accepted 13 January 1991.