Division of Mathematics, University of Dundee, Dundee DD1 4HN, UK.
Bull Math Biol. 2010 Oct;72(7):1666-95. doi: 10.1007/s11538-009-9492-9. Epub 2010 Feb 2.
There are potentially many situations in which creatures will be subject to infrequent but regular culling. In terms of controlling crop pests, some farmers may only be able to afford to apply pesticides occasionally. Alternatively, pesticides may be applied only occasionally to limit their unwelcome side effects, which include pesticide resistance, chemical poisoning of agricultural workers, and environmental degradation. In terms of conservation, some species (such as the red deer in the UK) may be culled occasionally to maintain balances within their ecosystem. However, in this paper we discover, as the culmination of an exploration of adult-stage culling of a creature with juvenile and adult life stages, that, in certain circumstances, regular but infrequent culling will, perversely, increase the average population of the creature.
在许多情况下，生物将面临不频繁但定期的捕杀。在控制作物害虫方面，一些农民可能只能偶尔使用农药。或者，为了限制农药不受欢迎的副作用，包括抗药性、农业工人的化学中毒和环境恶化，可能只偶尔使用农药。在保护方面，一些物种（如英国的红鹿）可能会偶尔被捕杀，以维持其生态系统的平衡。然而，在本文中，我们发现，作为对一个具有幼体和成年阶段的生物进行成年阶段捕杀的探索的结果，在某些情况下，有规律但不频繁的捕杀会适得其反，增加生物的平均种群数量。
