Integrating stress physiology, environmental change, and behavior in free-living sparrows
Integrating stress physiology, environmental change, and behavior in free-living sparrows
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DOI：
10.1016/s0018-506x(02)00020-x
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发表时间：
2003-01-01
影响因子：
3.5
通讯作者：
Hahn, TP
中科院分区：
文献类型：
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作者：
Breuner, CW;Hahn, TP
随着天气的恶化，繁殖的动物有各种各样的选择来确保生存。由于它们的流动性，鸟类可以很容易地放弃领土，在远离繁殖地的地方寻找有利的条件。然而，放弃的时机可能会对领土大小、交配质量、繁殖成功和生存产生影响。有大量证据表明，肾上腺皮质对压力的反应在调节这种行为转换的开始和维持中发挥了作用。在这里，我们开发了一个模型，描述了天气、食物可获得性、身体状况和应激生理在开始离开繁殖地点时的相互作用。我们使用在内华达山脉高海拔繁殖的白冠麻雀种群来测试该模型，在那里，繁殖季节开始时的恶劣天气通常会导致暂时放弃繁殖区域，并临时向低海拔避难所迁徙。研究结果表明：(1)在恶劣天气条件下，外源性皮质酮会延迟麻雀弃巢后返回繁殖地的时间；(2)在天气好的情况下，外源性皮质酮本身并不会导致栖息地的遗弃，但会增加繁殖地周围的活动范围；(3)应激反应的大小与麻雀的身体状况呈负相关。(C)2003年埃尔塞维尔科学公司(美国)。版权所有。
As weather deteriorates, breeding animals have a diverse array of options to ensure survival. Because of their mobility, birds can easily abandon territories to seek out benign conditions away from the breeding site. The timing of abandonment, however, may have repercussions for territory size, mate quality, reproductive success, and survival. There is a large body of evidence indicating that the adrenocortical response to stress plays a role in mediating the onset and maintenance of this behavioral switch. Here we develop a model describing the interactions of weather, food availability, body condition, and stress physiology in initiating departure from the breeding site. We tested the model using a population of white-crowned sparrows breeding at high elevation in the Sierra Nevada, where severe weather at the beginning of the breeding season often induces temporary abandonment of breeding territories and facultative altitudinal migration to lower elevation refugia. The data show that (1) during inclement weather, exogenous corticosterone delays return to the breeding site after territory abandonment; (2) during good weather, exogenous corticosterone alone does not induce territory abandonment, but does increase activity range around the breeding site; and (3) the magnitude of the corticosteroid response to stress is inversely related to body condition of the sparrow. (C) 2003 Elsevier Science (USA). All rights reserved.