LIFE-HISTORY STRATEGIES FOR ENERGY GAIN AND PREDATOR AVOIDANCE UNDER TIME CONSTRAINTS
LIFE-HISTORY STRATEGIES FOR ENERGY GAIN AND PREDATOR AVOIDANCE UNDER TIME CONSTRAINTS
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DOI：
10.1086/285069
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发表时间：
1990-05-01
影响因子：
2.9
通讯作者：
ROWE, L
中科院分区：
文献类型：
--
作者：
LUDWIG, D;ROWE, L
短期觅食行为通常受到以高速度获得食物和避免捕食的需要的影响。越来越多的证据表明，需要平衡这些相互冲突的需求在个体发育栖息地的变化中发挥了作用，包括复杂生命周期的壮观变化。以前的理论已经导致了独立于时间的规则来预测栖息地发生变化的大小。我们开发了一个模型，其中包括时间限制，假设繁殖或其他一些重大事件，如滞育或变态，必须发生在指定的时间或日期。我们将最近制定的动态规划，使战略，以平衡冲突的行为，表达他们在未来的生殖输出的共同货币。由此产生的理论预测的最佳策略前生殖栖息地的变化，取决于时间和体重。我们的理论，虽然来自一组假设，导致从以前的动态优化问题的多样性获得的见解的合成。
Short-term foraging behavior is typically influenced by the needs to obtain food at a high rate and to avoid predation. There is increasing evidence that the need to balance these conflicting demands plays a role in ontogenetic habitat shifts, including the spectacular shifts characteristic of complex life cycles. Previous theory has led to rules that are independent of time to predict the size at which habitats shifts take place. We develop a model that incorporates time constraints, by assuming that reproduction or some other major event, such as diapause or metamorphosis, must occur by a specified time or date. We incorporate recent formulations of dynamic programming that allow strategies to balance conflicting behaviors by expressing them in the common currency of future reproductive output. The resulting theory predicts optimal strategies for pre-reproductive habitat shifts that depend on both time and body weight. Our theory, although derived from a single set of assumptions, leads to a synthesis of insights gained from a diversity of previous dynamic optimization problems.