Ecological conditions influence sentinel decisions
Ecological conditions influence sentinel decisions
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DOI：
10.1016/j.anbehav.2011.09.028
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发表时间：
2011-12-01
期刊：
影响因子：
2.5
通讯作者：
Radford, A. N.
中科院分区：
文献类型：
--
作者：
Hollen, L. I.;Bell, M. B. V.;Radford, A. N.
生态条件可以通过影响发现捕食者的可能性和听到叫声的能力来影响与反捕食者行为有关的决定。以前的研究antipredator行为往往集中在觅食，其警惕行为可能会混淆的食物，他们吃的类型，并在语音通信网络的接收器。我们研究了栖息地和风力条件对哨兵行为的影响，这些哨兵暂停自己的觅食，采取一个提高的位置来扫描危险，而队友继续进食，并产生各种各样的觅食者用来调整他们的反捕食行为的电话。与更开阔的栖息地相比，在长草中，合作繁殖的鸟Turdoides bicolor的哨兵开始守卫更快，守卫时间更长，并且在大风中也更快地开始哨兵较量，可能是因为在这种情况下捕食风险增加。哨兵还选择了位置，既低，更接近觅食组时，它是有风的，潜在的改善传输的声音信号是有价值的觅食。我们的研究结果表明，哨兵行为可以受到外在因素，以及内在因素先前显示，并建议生态变化可能会影响决定轴承自私和合作的好处。(C)2011年，动物行为研究协会。由爱思唯尔有限公司出版。保留所有权利。
Ecological conditions can influence decisions relating to antipredator behaviour through impacts on the likelihood of detecting predators and the ability to hear vocalizations. Previous studies of antipredator behaviour have tended to focus on foragers, whose vigilance behaviour may be confounded by the type of food they are eating, and on receivers in vocal communication networks. We examined the impact of habitat and wind conditions on the behaviour of sentinels, individuals that suspend their own foraging to adopt a raised position to scan for danger while groupmates continue feeding, and that produce a variety of calls used by foragers to adjust their antipredator behaviour. Sentinels of the pied babbler, Turdoides bicolor, a cooperatively breeding bird, started guarding sooner and guarded for longer in long grass compared to more open habitats, and also initiated sentinel bouts sooner in high wind, probably because of the increased predation risk in such circumstances. Sentinels also selected positions that were both lower and closer to the foraging group when it was windy, potentially improving transmission of vocal signals that are valuable to foragers. Our results demonstrate that sentinel behaviour can be influenced by extrinsic factors, as well as the intrinsic factors previously shown, and suggest that ecological variation may affect decisions bearing both selfish and cooperative benefits. (C) 2011 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.