Global effects of land use intensity on the impoverishment of insect herbivore assemblages
Global effects of land use intensity on the impoverishment of insect herbivore assemblages
复制标题
土地利用强度对昆虫食草动物群落贫化的全球影响
DOI：
--
复制
发表时间：
2015
影响因子：
3.4
通讯作者：
M. Almeida
中科院分区：
文献类型：
--
作者：
W. Araújo;T. Tscharntke;M. Almeida
土地利用对原始野生动物栖息地的改变是物种灭绝的一个全球性原因，因为大多数本地物种在人类土地利用强度高的情况下无法生存。本研究收集了90个草食性昆虫与寄主植物的相互作用列表，探讨了土地利用强度对草食性昆虫群落物种丰富度和分类多样性的影响。土地利用强度对这些昆虫草食动物组合的影响进行了评估，使用路径分析，控制宿主植物丰富度，采样工作，植物和草食动物的分类范围的差异。我们在路径模型中包括外来寄主植物的比例，以评估土地利用强度的影响在多大程度上是由外来寄主植物取代本地介导的。总的来说，我们发现，土地利用强度的昆虫草食动物组合的物种丰富度和分类多样性的负面影响，这些影响是由外来寄主植物物种的比例增加介导的。由于宿主植物丰富度的影响是受控的，我们的研究结果意味着，昆虫植食性组合，由于人类的土地利用是更大的损失比他们的宿主植物。一个可能的影响，这种减少的物种丰富度和分类多样性的昆虫食草动物组合是加速损失的专业植物-食草动物的相互作用，从而有利于通才物种之间的相互作用和生物同质化的物种之间的相互作用在人类干扰的栖息地。
The modification of pristine wildlife habitats by land use is a worldwide cause of species extinction, as most native species cannot persist at high levels of human land use intensity. In this study, we gathered 90 lists of local interactions between herbivorous insects and their host plants to investigate the effects of land use intensity on the species richness and taxonomic diversity of insect herbivore assemblages. The effect of land use intensity on these insect herbivore assemblages was assessed using path analysis that controlled for differences in host plant richness, sampling effort, and the taxonomic range of plants and herbivores. We included the proportion of exotic host plant species in the path models to evaluate the extent to which the effect of land use intensity is mediated by the replacement of native with exotic host plants. Overall, we found negative effects of land use intensity on the species richness and taxonomic diversity of the insect herbivore assemblages, and these effects were mediated by an increase in the proportion of exotic host plant species. Since the effect of host plant richness was controlled for, our findings imply that the impoverishment of insect herbivore assemblages due to human land use is even greater than the loss of their host plant. A likely implication of such reduction in the species richness and taxonomic diversity of the insect herbivore assemblages is the accelerated loss of specialized plant-herbivore interactions, thus favoring interactions among generalist species and the biotic homogenization of species interactions across human-disturbed habitats.