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Indirect effects of habitat loss via habitat fragmentation: A cross-taxa analysis of forest-dependent species

机译：栖息地碎裂栖息地损失的间接影响：森林依赖物种的交叉征集分析

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Recent studies suggest that habitat amount is the main determinant of species richness, whereas habitat fragmentation has weak and mostly positive effects. Here, we challenge these ideas using a multi-taxa database including 2230 estimates of forest-dependent species richness from 1097 sampling sites across the Brazilian Atlantic Forest biodiversity hotspot. We used a structural equation modeling approach, accounting not only for direct effects of habitat loss, but also for its indirect effects (via habitat fragmentation), on the richness of forest-dependent species. We reveal that in addition to the effects of habitat loss, habitat fragmentation has negative impacts on animal species richness at intermediate (30-60%) levels of habitat amount, and on richness of plants at high ( > 60%) levels of habitat amount, both of which are mediated by edge effects. Based on these results, we argue that dismissing habitat fragmentation as a powerful force driving species extinction in tropical forest landscapes is premature and unsafe.
机译：最近的研究表明，栖息地数量是物种丰富性的主要决定因素，而栖息地碎片具有弱且主要是积极的影响。在这里，我们使用多纳税卡数据库挑战这些想法，包括从巴西大西洋森林生物多样性热点的1097个抽样场所的2230种森林依赖物种估计。我们使用了一种结构方程式建模方法，不仅针对栖息地损失的直接影响，而且还用于其间接影响（通过栖息地碎片），森林依赖物种的丰富性。我们揭示了栖息地损失的影响，栖息地碎片对中间体（30-60％）栖息地的动物物种丰富性带来负面影响，以及高（> 60％）栖息地植入量的植物丰富性，两者都是由边缘效应介导的。根据这些结果，我们认为将栖息地破碎丢失作为热带森林景观中的强大驾驶物种灭绝的强大力量突出。

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