Food web stability: The influence of trophic flows across habitats
Food web stability: The influence of trophic flows across habitats
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DOI：
10.1086/286182
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发表时间：
1998-09-01
影响因子：
2.9
通讯作者：
McCann, K
中科院分区：
文献类型：
--
作者：
Huxel, GR;McCann, K
在自然界中，跨生境的通量经常将营养和能量资源从生产力较高的地区带入生产力较低的地区。这些输入可以改变消费者和捕食者物种在接受食物网的消费率，从而影响食物网的稳定性。本文从一个三营养食物链模型出发，研究了外来输入对一个简单食物网模型稳定性的影响。我们考虑了外来输入对模型稳定性的影响，使用了四组生物学上合理的参数，代表了不同的动态结果。我们发现，低水平的外来输入稳定的食物网动态时，物种优先对本地来源的饲料，而无论是增加输入水平或改变喂养偏好，有利于外来输入，或两者兼而有之，导致脱钩的食物链，可能会导致一个或所有物种的损失。我们认为，外来投入是许多食物网生产力的重要来源，其影响需要进一步研究。这在各种系统中尤其重要，如洞穴、源头溪流和一些小的海洋岛屿，在这些系统中，从外来输入进入食物网的能量多于从本地输入。
In nature, fluxes across habitats often bring both nutrient and energetic resources into areas of low productivity from areas of higher productivity. These inputs can alter consumption rates of consumer and predator species in the recipient food webs, thereby influencing food web stability. Starting from a well-studied tritrophic food chain model, we investigated the impact of allochthonous inputs on the stability of a simple food web model. We considered the effects of allochthonous inputs on stability of the model using four sets of biologically plausible parameters that represent different dynamical outcomes. We found that low levels of allochthonous inputs stabilize food web dynamics when species preferentially feed on the autochthonous sources, while either increasing the input level or changing the feeding preference to favor allochthonous inputs, or both, led to a decoupling of the food chain that could result in the loss of one or all species. We argue that allochthonous inputs are important sources of productivity in many food webs and their influence needs to be studied further. This is especially important in the various systems, such as caves, headwater streams, and some small marine islands, in which more energy enters the food web from allochthonous inputs than from autochthonous inputs.