Krivan V
Department of Theoretical Biology, Institute of Entomology, Academy of Sciences of the Czech Republic, Branisovská 31, 370 05 Ceské Budĕjovice, Czech Republic.
Theor Popul Biol. 2000 Sep;58(2):79-94. doi: 10.1006/tpbi.2000.1480.
This article explores effects of adaptive intraguild predation on species coexistence and community structure in three species' food webs. Two Lotka-Volterra models that assume a trade-off between competition and predation strength are considered in detail. The first model does not explicitly model resource dynamics and is considered with both nonadaptive and adaptive intraguild predation; in the latter case predators choose their diet in order to maximize their instantaneous population growth rate. The second model includes resource population dynamics. Effects of adaptive intraguild predation on the community structure along a gradient in environment productivity are analyzed and compared with some experimental results of protist food webs. Conditions under which intraguild predation is adaptive are discussed for both models. It is proved that if intraguild predators are perfect optimizers then intraguild predation should decrease with increasing environmental productivity and adaptive intraguild predation is a stabilizing factor provided environmental productivity is high enough.
本文探讨了适应性集团内捕食对三种物种食物网中物种共存和群落结构的影响。详细考虑了两个假设竞争与捕食强度之间存在权衡的洛特卡 - 沃尔泰拉模型。第一个模型没有明确模拟资源动态，同时考虑了非适应性和适应性集团内捕食；在后一种情况下，捕食者选择其食物以使其瞬时种群增长率最大化。第二个模型包括资源种群动态。分析了适应性集团内捕食沿环境生产力梯度对群落结构的影响，并与原生生物食物网的一些实验结果进行了比较。针对这两个模型讨论了集团内捕食具有适应性的条件。证明了如果集团内捕食者是完美的优化者，那么集团内捕食应随着环境生产力的增加而减少，并且只要环境生产力足够高，适应性集团内捕食就是一个稳定因素。
