Corticosterone, body condition and locomotor activity: a model for dispersal in screech-owls
Corticosterone, body condition and locomotor activity: a model for dispersal in screech-owls
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DOI：
10.1006/anbe.1997.0625
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发表时间：
1998-02-01
期刊：
影响因子：
2.5
通讯作者：
Dufty, AM
中科院分区：
文献类型：
--
作者：
Belthoff, JR;Dufty, AM
提出并检验了一个解释常住尖声猫头鹰出生分散的模型。该模型基于荷尔蒙变化、身体状况和社会刺激之间的相互作用。它预测，皮质酮，一种肾上腺糖皮质激素，已知刺激运动和觅食活动，在通过内源性和外源性事件的结合传播之前，血浆中的含量增加。这介导了分散行为背后的运动活动。当皮质酮增加时，身体状况良好（即脂肪储备充足）的幼鱼会分散。身体状况不佳的鸟类不会，但在皮质酮的影响下，它们的觅食活动会增加。兄弟姐妹的分散将减少攻击和/或对食物的竞争，使剩余的幼崽能够改善他们的身体状况并分散。对尖嘴猫头鹰（Otus asio）和肯尼科蒂猫头鹰（O. kennicottii）的初步研究得出的结果与该模型基本一致。例如，圈养的幼年尖声猫头鹰在自由生活的幼鸟分散之前的几周内表现出增加的运动活动，此后活动水平下降。在圈养猫头鹰中，皮质酮的峰值与高运动活动时期（即分散时期）相对应。最后，实地研究表明，可能处于较好身体条件下的优势幼崽，在其较弱的兄弟姐妹之前开始扩散。(C) 1998动物行为研究协会。
A model that explains natal dispersal in resident screech-owls is presented and examined. The model is based on interactions among hormonal changes, body condition and social stimuli. It predicts that corticosterone, an adrenal glucocorticoid known to stimulate locomotor and foraging activity, increases in blood plasma prior to dispersal through a combination of endogenous and exogenous events. This mediates the locomotor activity that underlies dispersal behaviour. Juveniles in good body condition (i.e. those with sufficient fat reserves) will disperse when corticosterone increases. Birds in poor body condition will not, but they will increase their foraging activity under the influence of corticosterone. Dispersal of siblings will reduce aggression and/or competition for food, enabling the remaining juveniles to improve their body condition and disperse. Initial studies on screech-owls, Otus asio and O. kennicottii, have produced results that are generally consistent with the model. For example, captive juvenile screech-owls showed increased locomotor activity in the weeks leading up to the time when free-living juveniles are dispersing, and activity levels declined thereafter. Peaks in corticosterone corresponded with periods of high locomotor activity (i.e. at the time of dispersal) in captive owls. Finally, field studies indicate that dominant juveniles, which are presumably in better physical condition, initiated dispersal before their more subordinate siblings. (C) 1998 The Association for the Study of Animal Behaviour.