Jordán Ferenc, Scheuring István, Vida Gábor
Collegium Budapest, Institute for Advanced Study, Budapest, H-1014, Szentháromság u. 2., Hungary.
J Theor Biol. 2002 Apr 21;215(4):441-8. doi: 10.1006/jtbi.2001.2523.
Recent investigations on the structure of complex networks have provided interesting results for ecologists. Being inspired by these studies, we analyse a well-defined set of small model food webs. The extinction probability caused by internal Lotka-Volterra dynamics is compared to the position of species. Simulations have revealed that some global properties of these food webs (e.g. the homogeneity of connectedness) and the positions of species therein (e.g. interaction pattern) make them prone to modelled biotic extinction caused by population dynamical effects. We found that: (a) homogeneity in the connectedness structure increases the probability of extinction events; (b) in addition to the number of interactions, their orientations also influence the future of species in a web. Since species in characteristic network positions are prone to extinction, results could also be interpreted as describing the properties of preferred states of food webs during community assembly. Our results may contribute to understanding the intimate relationship between pattern and process in ecology.
最近对复杂网络结构的研究为生态学家提供了有趣的结果。受这些研究的启发，我们分析了一组定义明确的小型模型食物网。将由内部洛特卡 - 沃尔泰拉动力学引起的灭绝概率与物种的位置进行了比较。模拟结果表明，这些食物网的一些全局属性（例如连通性的同质性）以及其中物种的位置（例如相互作用模式）使它们容易受到由种群动态效应导致的模拟生物灭绝的影响。我们发现：（a）连通性结构的同质性增加了灭绝事件的概率；（b）除了相互作用的数量外，它们的方向也会影响食物网中物种的未来。由于处于特征网络位置的物种容易灭绝，这些结果也可以解释为描述了群落组装过程中食物网偏好状态的属性。我们的结果可能有助于理解生态学中模式与过程之间的密切关系。
