HERBIVORES AND PLANT DIVERSITY
HERBIVORES AND PLANT DIVERSITY
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DOI：
10.1086/285411
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发表时间：
1992-08-01
影响因子：
2.9
通讯作者：
CRAWLEY, MJ
中科院分区：
文献类型：
--
作者：
PACALA, SW;CRAWLEY, MJ
本文研究了两种植物竞争的空间彩票模型，其中竞争能力受取食水平的影响。食草动物可以通过两种性质不同的方式增强植物多样性。第一个是全球频率依赖性;植物所遭受的食草水平随着物种变得稀少而降低。其次，食草动物水平的空间变异可以为每个植物物种的食草动物创造短暂的、局部的避难所。这两种机制只有在植物的适口性与其竞争能力之间不存在负相关时才起作用。这两种机制还要求食草动物具有足够强的饮食偏好（或者，等效地，植物具有足够不同的放牧耐受性）。如果没有适口性和竞争能力之间的关系，那么植物多样性是一个单调递增的函数的食草动物的程度的单食性。相反，如果适口性和竞争能力之间存在正相关关系，则多样性/单食性程度的关系可能是单调增加或驼峰。
We study spatial lottery models of competition between two plant species in which competitive ability is affected by levels of herbivory. Herbivory may enhance plant diversity in two qualitatively different ways. The first is global frequency dependence; the level of herbivory suffered by a plant decreases as the species becomes rare. Second, spatial variability in levels of herbivory can create ephemeral, local refuges for herbivory for each plant species. Both of these mechanisms operate only if there is not a negative correlation between a plant's palatability and its competitive ability. Both mechanisms also require that herbivores have sufficiently strong diet preferences (or, equivalently, that the plants have sufficiently different grazing tolerances). If there is no relationship between palatability and competitive ability, then plant diversity is a monotonically increasing function of the herbivore's degree of monophagy. In contrast, if there is a positive correlation between palatability and competitive ability, then the diversity/degree-of-monophagy relationship may be either monotonically increasing or humped.