A general model for food web structure
A general model for food web structure
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DOI：
10.1126/science.1156269
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发表时间：
2008-05-02
期刊：
影响因子：
56.9
通讯作者：
Pascual, Mercedes
中科院分区：
文献类型：
--
作者：
Allesina, Stefano;Alonso, David;Pascual, Mercedes
生态学的一个中心问题是确定形成复杂网络的过程，这些网络被称为由物种及其进食关系形成的食物网。这些网络的拓扑结构是生态系统动态的一个主要决定因素，并最终决定了生态系统对人类影响的反应。对于自然界中观察到的错综复杂的食物网，已经提出了几个简单的模型。我们表明，到目前为止提出的三个主要模型未能完全复制的经验数据，我们开发了一个基于可能性的方法，直接比较替代模型的基础上的网络的完整结构。结果驱动一个新的模型，该模型能够生成所有的经验数据集，并以最高的可能性这样做。
A central problem in ecology is determining the processes that shape the complex networks known as food webs formed by species and their feeding relationships. The topology of these networks is a major determinant of ecosystems' dynamics and is ultimately responsible for their responses to human impacts. Several simple models have been proposed for the intricate food webs observed in nature. We show that the three main models proposed so far fail to fully replicate the empirical data, and we develop a likelihood- based approach for the direct comparison of alternative models based on the full structure of the network. Results drive a new model that is able to generate all the empirical data sets and to do so with the highest likelihood.