Reconciling the Omnivory-Stability Debate
Reconciling the Omnivory-Stability Debate
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DOI：
10.1086/663191
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发表时间：
2012-01-01
影响因子：
2.9
通讯作者：
McCann, Kevin
中科院分区：
文献类型：
--
作者：
Gellner, Gabriel;McCann, Kevin
尽管试图调和，杂食在食物网稳定中的作用仍然不清楚。在这里，我们开发了一种新的群落矩阵方法，类似于模块化食物网理论的分岔方法，以表明杂食性食物链的稳定性主要取决于相互作用的强度。我们发现杂食性相互作用强度影响线性食物链稳定性的可能方式只有六种。这六个例子的结果表明：(1)强杂食性总是不稳定的；(2)弱到中等杂食性相互作用强度的稳定性在可能的稳定性响应集合中占主导地位；(3)杂食性偶尔会出现严格不稳定或间歇性不稳定。然后，我们回顾了Pimm和Lawton的经典结果，表明尽管他们的参数化倾向于产生低百分比的稳定杂食性网络，但同样的参数化为弱相互作用效应提供了强有力的理论支持。最后，我们认为我们目前对杂食的经验知识与这一一般理论是一致的。
Despite attempts at reconciliation, the role of omnivory in food web stability remains unclear. Here we develop a novel community matrix approach that is analogous to the bifurcation method of modular food web theory to show that the stability of omnivorous food chains depends critically on interaction strength. We find that there are only six possible ways that omnivorous interaction strengths can influence the stability of linear food chains. The results from these six cases suggest that: (1) strong omnivory is always destabilizing, (2) stabilization by weak to intermediate omnivorous interaction strengths dominates the set of possible stability responses, and, (3) omnivory can be occasionally strictly destabilizing or intermittently destabilizing. We then revisit the classical results of Pimm and Lawton to show that although their parameterization tends to produce a low percentage of stable omnivorous webs, the same parameterization shows strong theoretical support for the weak interaction effect. Finally, we end by arguing that our current empirical knowledge of omnivory resonates with this general theory.