Foraging in a patchy environment by a predatory net-spinning caddis larva: A test of optimal foraging theory
Foraging in a patchy environment by a predatory net-spinning caddis larva: A test of optimal foraging theory
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捕食性网纺石蚕幼虫在斑驳环境中觅食：最佳觅食理论的检验
DOI：
10.1007/bf00346824
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发表时间：
2004
期刊：
影响因子：
2.7
通讯作者：
A. Hildrew
中科院分区：
文献类型：
--
作者：
C. Townsend;A. Hildrew
在猎物呈斑块状分布的生境中，圆斑小蜂的捕食性幼虫会引起猎物的大量消耗。最优觅食理论预测，在这种情况下，捕食者应该呆在任何给定的补丁，直到猎物捕获率下降到一个值等于平均栖息地作为一个整体。这是测试使用现场和实验室数据的组合，结果与预测广泛一致。第二个预测是，在猎物丰富的栖息地，边际捕获率应该更高，这是不支持的。有人认为，通过使用一个简单的经验法则（恒定的放弃时间）P. conspersai是能够接近最优解的大部分时间。
The predatory larvae of the caddisPlectrocnemia conspersa(Curtis) cause significant prey depletion in a habitat in which prey are patchily distributed. Optimal foraging theory predicts that under these circumstances a predator should stay in any given patch until the prey capture rate there drops to a value equal to the average for the habitat as a whole. This was tested using a combination of field and laboratory data and the results were in broad agreement with the prediction. A second prediction is that the marginal capture rate should be higher in a habitat richer in prey and this was not supported. It is argued that by using a simple rule-of-thumb (constant giving-up-time)P. conspersais able to approach the optimal solution for much of the time.