Searching behaviour of foraging waders: does feeding success influence their walking?
Searching behaviour of foraging waders: does feeding success influence their walking?
复制标题
DOI：
10.1016/j.anbehav.2009.02.002
复制
发表时间：
2009-05-01
期刊：
影响因子：
2.5
通讯作者：
Palmeirim, Jorge M.
中科院分区：
文献类型：
--
作者：
Dias, Maria P.;Granadeiro, Jose P.;Palmeirim, Jorge M.
捕食集群猎物的捕食者往往有一个“区域限制搜索”（ARS），其特征是在猎物丰富的地区缓慢而曲折的运动，在贫困地区快速而直线的运动相结合。在潮间带觅食的涉禽通常捕食被掩埋的大型无脊椎动物，它们的分布通常是集群的。然而，涉禽物种在寻找猎物的策略上有所不同：有些主要依靠视觉线索，有些依靠触觉线索，还有一些遵循更通才的方法，简单地用喙扫过沉积物表面。我们假设，这些策略的影响，通过ARS涉禽。我们分析了这一假设，通过比较一个“触觉”的捕食者（黑尾godwit，Limosa limosa），与一个“视觉”的捕食者（红脚鹬，Tringa totanus）和一个“清道夫”（avocet，Recurvirostra avosetta）的细尺度运动。我们拍摄了这三个物种的190个个体，并利用GIS设备，获得了超过12 000个空间位置，沿着详细的摄食活动记录。我们分析了涉禽细尺度运动的几个参数，如觅食和搜索速度，曲折度，以及这些参数和觅食成功之间的关系。只有触觉捕食者，黑尾金丝雀，遵循ARS，降低搜索速度和增加空间转向率时，猎物摄入量较高。此外，它的觅食策略涉及短期的运动调整，最大限度地提高发现后续猎物的可能性，这表明它有先验知识或快速感知猎物分布模式的能力。(C)2009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。
Predators that feed on clustered prey tend to have an 'area-restricted search' (ARS), characterized by a combination of a slow and tortuous movement in prey-rich areas, and a fast and straight movement in poorer areas. Waders that forage in intertidal areas usually prey upon buried macroinvertebrates, whose distribution is often clustered. However, wader species differ in the strategy used to find their prey: some rely mainly on visual cues, some rely on tactile cues, and others follow a more generalist method, simply sweeping the sediment surface with the bill. We hypothesized that these strategies influence the adoption of an ARS by waders. We analysed this hypothesis by comparing the fine-scale movement of a 'tactile' predator (black-tailed godwit, Limosa limosa), with that of a 'visual' predator (redshank, Tringa totanus) and a 'sweeper' (avocet, Recurvirostra avosetta). We filmed 190 individuals of the three species and, using GIS facilities, obtained more than 12 000 spatial positions, along with detailed records of feeding activity. We analysed several parameters of fine-scale movement of waders, such as foraging and searching speeds, tortuosity, and the relationship between these parameters and foraging success. Only the tactile predator, the black-tailed godwit, followed an ARS, reducing searching speed and increasing spatial turning rate whenever the prey intake was higher. Furthermore, its foraging strategy involved short-term adjustments of movement that maximized the likelihood of finding subsequent prey, suggesting a prior knowledge or an ability to perceive rapidly the distribution pattern of its prey. (C) 2009 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.