Evolution of handling time can destroy the coexistence of cycling predators
Evolution of handling time can destroy the coexistence of cycling predators
复制标题
处理时间的演变可能会破坏骑自行车的掠食者的共存
DOI：
10.1111/j.1420-9101.2005.00993.x
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发表时间：
2006
影响因子：
2.1
通讯作者：
S. Liu
中科院分区：
文献类型：
--
作者：
É. Kisdi;S. Liu
几个消费者（捕食者）与Holling II型功能反应可能会稳健共存，即使他们利用相同的资源（猎物），只要人口表现出非平衡动力学和捕食者的处理时间是足够不同的。我们调查的处理时间的演变，特别是它的共存的影响。较长的处理时间在损失觅食时间方面是昂贵的，但允许从捕获的猎物个体中提取更多的营养。假设一个双曲线饱和的处理时间和新的捕食者产生的数量之间的关系，每消耗猎物，我们得到三个结果：（i）有一个全球进化稳定的处理时间;（ii）在这个模型中，最多两个捕食者的策略可以共存;（iii）当两个捕食者共存时，一个突变体与中间处理时间总是可以入侵。这意味着没有进化稳定的共存，和处理时间的演变最终导致一个单一的进化稳定的捕食者。这些结果被证明是有效的分析和任意（不仅是小）突变，但它们取决于处理时间和后代生产之间的关系，并假设捕食者不同，只有在他们的猎物处理策略。
Several consumers (predators) with Holling type II functional response may robustly coexist even if they utilize the same resource (prey), provided that the population exhibits nonequilibrium dynamics and the handling time of predators is sufficiently different. We investigate the evolution of handling time and, in particular, its effect on coexistence. Longer handling time is costly in terms of lost foraging time, but allows more nutrients to be extracted from a captured prey individual. Assuming a hyperbolically saturating relationship between handling time and the number of new predators produced per prey consumed, we obtain three results: (i) There is a globally evolutionarily stable handling time; (ii) At most two predator strategies can coexist in this model; (iii) When two predators coexist, a mutant with intermediate handling time can always invade. This implies that there is no evolutionarily stable coexistence, and the evolution of handling time eventually leads to a single evolutionarily stable predator. These results are proven analytically and are valid for arbitrary (not only small) mutations; they however depend on the relationship between handling time and offspring production and on the assumption that predators differ only in their prey handling strategy.