Mittler J
Center for Nonlinear Studies, Los Alamos National Laboratory, New Mexico 87545, USA.
Theor Popul Biol. 1997 Jun;51(3):238-51. doi: 10.1006/tpbi.1997.1305.
A mathematical model is presented for the dynamics of predator-prey interactions when predators do not consume prey (or clumps of prey) in their entirety. Using a combination of analytical and numerical methods, I demonstrate that predator-mediated changes in the distribution of intact and partially consumed prey can affect the outcome of competition between predators in unexpected ways. In come cases, two predators can coexist on a single prey species owing to tradeoffs between the ability to consume prey completely and other competitive abilities. In other cases, predators exhibit frequency-dependent dynamics in which the first predator to occupy the habitat can prevent the other from invading. Conditions for stable coexistence usually expand if the larger predator scatters uneaten prey parts, if prey renewal includes both small and large items, or if the predator with the smaller retrieval capacity is poor at catching intact prey relative to the other predator.
提出了一个数学模型，用于描述捕食者不将猎物（或猎物群体）全部消耗时的捕食者 - 猎物相互作用动态。通过结合分析方法和数值方法，我证明了捕食者介导的完整猎物和部分消耗猎物分布的变化会以意想不到的方式影响捕食者之间的竞争结果。在某些情况下，由于完全消耗猎物的能力与其他竞争能力之间的权衡，两种捕食者可以在单一猎物物种上共存。在其他情况下，捕食者表现出频率依赖动态，其中首先占据栖息地的捕食者可以阻止另一种捕食者入侵。如果较大的捕食者散落未吃的猎物部分，如果猎物更新包括小猎物和大猎物，或者如果具有较小取回能力的捕食者相对于另一种捕食者在捕捉完整猎物方面较差，稳定共存的条件通常会扩大。
