Food hoarding: future value in optimal foraging decisions
Food hoarding: future value in optimal foraging decisions
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DOI：
10.1016/j.ecolmodel.2003.10.022
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发表时间：
2004-06-15
影响因子：
3.1
通讯作者：
Roughgarden, J
中科院分区：
文献类型：
--
作者：
Gerber, LR;Reichman, OJ;Roughgarden, J
传统上，最优觅食理论被应用于觅食者根据资源属性（如热量摄入与处理时间）的权衡来决定当前资源消耗的情况。食物储存使动物能够管理食物在空间和时间上的可用性，这为觅食决策增加了一个复杂的维度，并可能影响传统觅食理论的预测。关于缓存行为在最优觅食理论中的作用的一个关键问题是关于未来价值的信息可能影响觅食决策的程度。为了研究这个问题，我们使用了一个简单的猎物选择模型，该模型最大限度地减少了觅食时间，并进行了修改，包括食物储存和营养价值随时间的变化。我们使用模拟来评估每个猎物的觅食活动所花费的时间以及代表不同丰度水平、处理时间的3125个参数组合的最佳觅食策略（例如缓存与立即消耗）。还有营养价值。使用判别函数分析，可以区分“缓存”与“立即消费”是最优策略的情况，而丰度是唯一的预测变量。随着时间的推移，猎物数量的减少和营养价值的增加是贮藏最理想的情况。这些结果为识别觅食行为的细微差异提供了一个框架，当未来的价值被考虑在内时，从而提高了我们对缓存动物如何觅食的预测性理解。(C) 2003 Elsevier B.V.版权所有
Traditionally, optimal foraging theory has been applied to situations in which a forager makes decisions about current resource consumption based on tradeoffs in resource attributes (e.g. caloric intake versus handling time). Food storage, which permits animals to manage the availability of food in space and time, adds a complex dimension to foraging decisions, and may influence the predictions of traditional foraging theory. One key question about the role of caching behavior in optimal foraging theory is the degree to which information about future value might influence foraging decisions. To investigate this question, we use a simple prey selection model that minimizes the time spent foraging and is modified to include food storage and changes in nutritional value through time. We used simulations to evaluate time spent in foraging activities per prey item and optimal foraging strategies (e.g. cache versus consume immediately) for 3125 parameter combinations, representing different abundance levels, handling times. and nutritional values. Using discriminant function analysis it was possible to distinguish situations where "caching" versus "immediate consumption" were optimal strategies with abundance as the single predictive variable. The circumstances where caching was optimal were characterized by a decline in prey abundance and an increase in nutritional value through time. These results provide a framework for identifying subtle differences in foraging behavior when future value is accounted for thereby improving our predictive understanding of how caching animals forage. (C) 2003 Elsevier B.V. All rights reserved.