Interactive effects of warming, eutrophication and size structure: impacts on biodiversity and food-web structure
Interactive effects of warming, eutrophication and size structure: impacts on biodiversity and food-web structure
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DOI：
10.1111/gcb.13086
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发表时间：
2016-01-01
影响因子：
11.6
通讯作者：
Brose, Ulrich
中科院分区：
文献类型：
--
作者：
Binzer, Amrei;Guill, Christian;Brose, Ulrich
气候变暖和富营养化是自然生态系统中两个最重要的全球变化压力源，但人们对它们之间的相互作用知之甚少。我们使用了一个复杂的、大小结构的食物网的动态模型来评估相互作用对多样性和网络结构的影响。我们发现了拮抗影响：变暖增加了富营养系统的多样性，减少了贫营养系统的多样性。这些效应与群落规模结构相互作用：类似规模物种的群落，如寄生-寄主系统，因变暖而稳定，因富营养化而不稳定，而规模结构的捕食者-猎物网络的多样性随着变暖而强烈减少，但随着富营养化而减少的程度较弱。通才和专才的非随机灭绝风险导致无规模结构网络的连通性较高，而规模结构社区的连通性较低。总体而言，我们的研究结果揭示了气候变暖和富营养化的相互影响，并表明大小结构可以作为预测群落对这些全球变化压力源敏感性的重要代理。
Warming and eutrophication are two of the most important global change stressors for natural ecosystems, but their interaction is poorly understood. We used a dynamic model of complex, size-structured food webs to assess interactive effects on diversity and network structure. We found antagonistic impacts: Warming increases diversity in eutrophic systems and decreases it in oligotrophic systems. These effects interact with the community size structure: Communities of similarly sized species such as parasitoid-host systems are stabilized by warming and destabilized by eutrophication, whereas the diversity of size-structured predator-prey networks decreases strongly with warming, but decreases only weakly with eutrophication. Nonrandom extinction risks for generalists and specialists lead to higher connectance in networks without size structure and lower connectance in size-structured communities. Overall, our results unravel interactive impacts of warming and eutrophication and suggest that size structure may serve as an important proxy for predicting the community sensitivity to these global change stressors.