Changes in vigilance and foraging behaviour with light intensity and their effects on food intake and predator detection in house finches
Changes in vigilance and foraging behaviour with light intensity and their effects on food intake and predator detection in house finches
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DOI：
10.1016/j.anbehav.2007.01.005
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发表时间：
2007-11-01
期刊：
影响因子：
2.5
通讯作者：
Tran, Elizabeth
中科院分区：
文献类型：
--
作者：
Fernandez-Juricic, Esteban;Tran, Elizabeth
成群觅食的动物面临着不同的挑战，比如躲避捕食者和争夺食物。很少考虑的一个因素是照度。社会性动物利用阳光照射的斑块可以在视网膜上想象太阳，抑制视觉感知，因此，使用个人和社会信息。我们的目标是通过研究家雀（Carpodacus mexicanus）的成对相互作用来评估不同捕食风险水平下光照的影响。我们操纵捕食风险水平（低和高）和照度（低和高），并记录补丁使用，扫描和觅食行为，食物摄入率和捕食者检测的变化。我们发现，光照影响了家雀的行为，（a）避免阳光照射的斑块，（B）通过减少扫描回合持续时间改变了高光照下的警惕行为，（c）减少了高光照条件下的觅食尝试，尽管食物摄入量没有受到影响，以及（d）当在强光条件下成对觅食时，以及当同种动物表现出反捕食者时，视觉上更难察觉的反应。如果个人和社会信息源的捕食风险被限制在阳光照射的补丁，动物可能会增加他们的感知捕食风险。我们讨论了其他的解释，如较高的捕食风险在阳光照射的补丁，由于更大的视觉暴露于捕食者。我们认为，在光照条件下的异质性应被认为是一个生态因素影响觅食和antipredator行为的群体。(c)2007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。
Animals foraging in groups face different challenges, like avoiding predators and competing for food. One factor that has received little consideration is illuminance. Social animals exploiting sunlit patches could image the sun on their retinas, restraining visual perception, and, as a result, the use of personal and social information. Our goal was to assess the effects of illuminance under different levels of predation risk by studying pairwise interactions in house finches, Carpodacus mexicanus. We manipulated predation risk levels (low and high) and illuminance (low and high), and recorded changes in patch use, scanning and foraging behaviour, food intake rate, and predator detection. We found that illuminance affected the behaviour of house finches, which (a) avoided sunlit patches, (b) changed vigilance behaviour under high illuminance by reducing scan bout duration, (c) reduced foraging attempts under high light conditions, although food intake was not affected, and (d) increased the latency to detect a predator attack when foraging in pairs under high light conditions and when conspecifics showed antipredator responses that were more difficult to detect visually. If personal and social information sources about predation risk are restricted in sunlit patches, animals might increase their perceived predation risk. We discuss alternative interpretations, such as higher predation risk in sunlit patches due to greater visual exposure to predators. We suggest that heterogeneity in light conditions should be considered an ecological factor affecting foraging and antipredator behaviour in groups. (c) 2007 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.