Searching strategy of the painted turtle Chrysemys picta across spatial scales
Searching strategy of the painted turtle Chrysemys picta across spatial scales
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DOI：
10.1016/j.anbehav.2004.01.018
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发表时间：
2004-12-01
期刊：
影响因子：
2.5
通讯作者：
White, HR
中科院分区：
文献类型：
--
作者：
Bowne, DR;White, HR
生物体在寻找资源时所走的运动路径对这种搜索的成功有很大的贡献。但是，相似的搜索策略是否用于非常不同的空间尺度？使用彩绘龟作为我们的模式生物，我们问（1）是否陆地搜索路径，无论是形状和速度，在小（30米）和大（> 500米）的空间尺度是相似的，（2）这些搜索路径是否是线性的，（3）什么环境条件影响搜索路径的形状？我们发现，在小的和大的空间尺度上的运动路径几乎是直的，在统计上彼此无法区分。小空间尺度和大空间尺度下的平均旋转角度在统计学上相似，最佳代表角度为1.8度。然而，小规模和大规模路径之间的净流离失所率却大不相同。在小的空间尺度上，路径形状和运动速率的影响最强烈的云量和海龟的大小。我们的研究结果表明，搜索路径的形状是一致的，在小的和大的空间尺度，并支持外推大规模的路径形状从小规模的观测。然而，净流离失所率取决于规模，因此，在使用小规模监测到的行为来预测较大地区的迁移率时必须谨慎。一个意想不到的结果是，在本研究系统中，彩龟没有遵循排水寻找水生栖息地。(C)2004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。
The movement path made by an organism in search of a resource contributes strongly to the success of that search. But are similar search strategies used at very different spatial scales? Using painted turtles as our model organism, we ask (1) whether terrestrial search paths, both shape and rate, are similar at small (30 m) and large (> 500 m) spatial scales, (2) whether those search paths are linear, and (3) what environmental conditions affect the shape of the search path? We found that movement paths at both small and large spatial scales were nearly straight and statistically indistinguishable from one another. The mean turning angles at small and large spatial scales were statistically similar and were best represented by an angle of 1.8degrees. Net displacement rates were, however, quite different between small- and large-scale paths. At small spatial scales, path shape and movement rate were most strongly affected by cloud cover and turtle size, respectively. Our results indicate that the shape of a search path is consistent over small and large spatial scales and gives support for extrapolating larger-scale path shape from small-scale observations. Net displacement rates, however, were scale dependent and thus caution must be taken in using behaviours detected at small scales to predict movement rates over larger areas. An unexpected result was that painted turtles did not follow drainages in search of aquatic habitat in this study system. (C) 2004 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.