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首页> 外文期刊>Oecologia >Herbivory strongly influences among-population variation in reproductive output of Lythrum salicaria in its native range
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Herbivory strongly influences among-population variation in reproductive output of Lythrum salicaria in its native range

机译：食草强烈影响当地的千屈菜的种群产量变异

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Herbivory can negatively affect several components of plant reproduction. Yet, because of a lack of experimental studies involving multiple populations, the extent to which differences in herbivory contribute to among-population variation in plant reproductive success is poorly known. We experimentally determined the effects of insect herbivory on reproductive output in nine natural populations of the perennial herb Lythrum salicaria along a disturbance gradient in an archipelago in northern Sweden, and we quantified among-population differentiation in resistance to herbivory in a common-garden experiment in the same area. The intensity of leaf herbivory varied > 500-fold and mean female reproductive success > 400-fold among the study populations. The intensity of herbivory was lowest in populations subject to strong disturbance from ice and wave action. Experimental removal of insect herbivores showed that the effect of herbivory on female reproductive success was correlated with the intensity of herbivory and that differences in insect herbivory could explain much of the among-population variation in the proportion of plants flowering and seed production. Population differentiation in resistance to herbivory was limited. The results demonstrate that the intensity of herbivory is a major determinant of flowering and seed output in L. salicaria, but that differences in herbivory are not associated with differences in plant resistance at the spatial scale examined. They further suggest that the physical disturbance regime may strongly influence the performance and abundance of perennial herbs and patterns of selection not only because of its effect on interspecific competition, but also because of effects on interactions with specialized herbivores.
机译：食草会对植物繁殖的几个组成部分产生负面影响。然而，由于缺乏涉及多个种群的实验研究，食草差异导致植物繁殖成功的种群间差异的程度尚不清楚。我们通过实验确定了昆虫食草对瑞典北部群岛上多年生草本千屈菜柳的九个自然种群沿扰动梯度的繁殖产量的影响，并且我们在一个普通的花园实验中对不同种群对食草的抗性进行了定量分析。同一区域。在研究人群中，叶片食草的强度变化> 500倍，女性平均繁殖成功> 400倍。在受到冰和波浪作用强烈干扰的人群中，草食性强度最低。实验性去除昆虫食草动物表明，食草动物对女性生殖成功的影响与食草动物的强度有关，而且昆虫食草动物的差异可以解释植物种群开花和种子产量比例的种群间差异。耐草食性的种群分化受到限制。结果表明，食草的强度是水杨柳开花和种子产量的主要决定因素，但是在所研究的空间尺度上，食草的差异与植物抗性的差异无关。他们进一步表明，物理干扰机制可能会强烈影响多年生草本植物的性能和丰富度以及选择模式，这不仅是因为其对种间竞争的影响，而且还因为与特殊草食动物相互作用的影响。

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