Habitat Fragmentation and Species Loss across Three Interacting Trophic Levels: Effects of Life-History and Food-Web Traits
Habitat Fragmentation and Species Loss across Three Interacting Trophic Levels: Effects of Life-History and Food-Web Traits
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DOI：
10.1111/j.1523-1739.2009.01214.x
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发表时间：
2009-10-01
影响因子：
6.3
通讯作者：
Zak, Marcelo
中科院分区：
文献类型：
--
作者：
Cagnolo, Luciano;Valladares, Graciela;Zak, Marcelo
不是所有的物种都有可能受到同样的影响，栖息地破碎化，因此，我们评估了森林残留物的大小对植物，采叶昆虫，及其寄生虫的营养联系的社区的影响。我们探讨了差异脆弱性的可能性，栖息地面积减少有关的物种特异性和食物网特征，通过比较物种面积回归斜率。此外，我们寻找这些性状和营养水平的协同效应。我们收集了开采的叶子和记录植物，潜叶虫，寄生虫物种的相互作用，在5个100米（2）样带在19个查科塞拉诺林地遗迹在阿根廷中部。根据个体大小、自然丰度、营养宽度和营养水平，将物种分为极端类别。物种面积的斜率不同组之间的极端值的自然丰度或营养专业化。然而，生活史和食物网特征的协同效应，只发现营养级和营养宽度：面积相关的物种损失是最高的专业寄生蜂。有人认为，物种在相互作用网络中的位置可以决定它们对灭绝的脆弱性。我们的研究结果提供的证据表明，食物网参数，如营养级和营养宽度，影响物种对栖息地破碎化的敏感性。
Not all species are likely to be equally affected by habitat fragmentation; thus, we evaluated the effects of size of forest remnants on trophically linked communities of plants, leaf-mining insects, and their parasitoids. We explored the possibility of differential vulnerability to habitat area reduction in relation to species-specific and food-web traits by comparing species-area regression slopes. Moreover, we searched for a synergistic effect of these traits and of trophic level. We collected mined leaves and recorded plant, leaf miner, and parasitoid species interactions in five 100-m(2) transects in 19 Chaco Serrano woodland remnants in central Argentina. Species were classified into extreme categories according to body size, natural abundance, trophic breadth, and trophic level. Species-area slopes differed between groups with extreme values of natural abundance or trophic specialization. Nevertheless, synergistic effects of life-history and food-web traits were only found for trophic level and trophic breadth: area-related species loss was highest for specialist parasitoids. It has been suggested that species position within interaction webs could determine their vulnerability to extinction. Our results provide evidence that food-web parameters, such as trophic level and trophic breadth, affect species sensitivity to habitat fragmentation.