Female aggressive response and hormonal correlates -: an intrusion experiment in a free-living passerine
Female aggressive response and hormonal correlates -: an intrusion experiment in a free-living passerine
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DOI：
10.1007/s00265-008-0595-3
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发表时间：
2008-08-01
影响因子：
2.3
通讯作者：
Amundsen, Trond
中科院分区：
文献类型：
--
作者：
Parn, Henrik;Lindstrom, Karin M.;Amundsen, Trond
雄性和雌性的最佳交配系统很少相同，而雄性通常会从吸引更多雌性到领地中获益，但这可能会给当地的雌性带来成本。因此，雌性应防止探矿雌性在该地区定居。我们研究了自由生活的蓝喉鸫在产蛋前期对模拟雌性领地入侵的雄性和雌性行为和荷尔蒙反应。在研究人群中，一夫多妻制的发生会给当地女性带来潜在的健康成本。我们记录了现场女性诱饵和女性歌曲播放前后攻击行为的不同方面。将这些行为与使用雄性诱饵的一组入侵进行比较。试验结束时，捕获这些鸟，并分析血液样本中的雄烯二酮、睾酮、雌二醇和皮质酮。在入侵前期间，没有观察到雌性。雌性通常会对雌性诱饵做出强烈反应，包括增加飞行速度、发声和明显的栖息。近一半的雄性会向雌性诱饵展示，但当雌性在场时却不会。我们认为，蓝喉鸫中常驻的雌性攻击性会阻止其配偶的求爱，并向雌性入侵者发出其交配状态的信号。因此，雌性的攻击性可能会阻止更多的雌性在领地定居并塑造交配系统。以歌曲回应的女性雌二醇水平较高。这些发现表明雌二醇可能支持繁殖雌鸟的攻击行为。
The optimal mating system is rarely the same for males and females-whereas males usually benefit from attracting additional females to the territory, this could incur costs for the resident female. Females should therefore prevent prospecting females from settling on the territory. We studied the male and female behavioral and hormonal responses to simulated female territorial intrusions in free-living bluethroats during the pre-laying period. In the study population, polygyny occurs with potential fitness costs for the resident female. We recorded different aspects of aggressive behavior before and after presentation of a live female decoy and playback of female song. These behaviors were compared with a set of intrusions using a male decoy. At the end of a trial, the birds were captured, and blood samples were analyzed for androstenedione, testosterone, estradiol and corticosterone. During the pre-intrusion period, none of the females were observed. Females generally responded strongly to the female decoy by increased flight rate, vocalizations, and by conspicuous perching. Nearly half of the males displayed to the female decoy but never while the resident female was present. We suggest that resident female aggression in bluethroats prevents courtship by her mate and signals her mating status to the female intruder. Female aggression could therefore prevent additional females to settle on the territory and shape the mating system. Females that responded with song had higher levels of estradiol. These findings suggest that estradiol may support aggression in breeding female birds.