Anomalous Predictions of Ratio-Dependent Models of Predation
Anomalous Predictions of Ratio-Dependent Models of Predation
复制标题
比率依赖型捕食模型的异常预测
作者：
P. Abrams
一个简单的模型的比率依赖的捕食，和四个经验检验的预测，这个模型的开发和讨论。这些预测之一是，捕食者的死亡率和效率不应该影响猎物的密度或动态。这与各种各样的经验知识相矛盾。两种类型的扩展的简单模型被认为是。首先是引入处理时间，另一个是引入额外的猎物物种。结果表明，这些扩展的先前表示是不一致的唯一机制，已被证明产生一个比率依赖的响应。这两种扩展都没有改变比率依赖模型的主要异常预测;即，改变捕食者的死亡率或其适应度的其他组成部分不会影响平衡的猎物密度。
A simple model of ratio-dependent predation is developed, and four empirically testable predictions of this model are developed and discussed. One of these predictions is that the predator's death rate and efficiency should not affect the density or dynamics of the prey. This contradicts a wide variety of empirical knowledge. Two types of extension of the simple model are considered. The first is the introduction of handling time, and the other is the introduction of additional prey species. It is shown that previous representations of both of these extensions are inconsistent with the only mechanism that has been shown to generate a ratio-dependent response. Neither of the extensions changes the main anomalous prediction of ratio-dependent models; i.e., that changing the predator's death rate or other components of its fitness will not affect equilibrium prey density.