Interaction strength combinations and the overfishing of a marine food web
Interaction strength combinations and the overfishing of a marine food web
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DOI：
10.1073/pnas.0501562102
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发表时间：
2005-04-12
影响因子：
11.1
通讯作者：
Sala, E
中科院分区：
文献类型：
--
作者：
Bascompte, J;Melián, CJ;Sala, E
生态群落的稳定性在很大程度上取决于捕食者和猎物之间相互作用的强度。在这里，我们表明，这些相互作用的强度结构非随机在一个大的加勒比海海洋食物网。具体而言，在食物链的两个连续水平上的强相互作用的共现发生的频率低于预期的机会。即使它们发生，这些强烈相互作用的链伴随着强大的杂食性更经常比预期的机会。通过使用食物网模型，我们表明，这些相互作用的强度组合减少了过度捕捞后的顶级捕食者的营养级联的可能性。然而，捕鱼有选择地消除了在强烈相互作用的链中占主导地位的捕食者。因此，对整个社区产生强烈影响的可能性仍然是一个威胁。
The stability of ecological communities largely depends on the strength of interactions between predators and their prey. Here we show that these interaction strengths are structured nonrandomly in a large Caribbean marine food web. Specifically, the cooccurrence of strong interactions on two consecutive levels of food chains occurs less frequently than expected by chance. Even when they occur, these strongly interacting chains are accompanied by strong omnivory more often than expected by chance. By using a food web model, we show that these interaction strength combinations reduce the likelihood of trophic cascades after the overfishing of top predators. However, fishing selectively removes predators that are overrepresented in strongly interacting chains. Hence, the potential for strong community-wide effects remains a threat.