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arXiv 1310.8091q-bio.PEphysics.bio-ph
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碎屑在带扩散的空间食物网〈动〉<动>模型中的作用

Role of detritus in a spatial food web model with diffusion

Andrzej Pękalski, Janusz Szwabiński

摘要:

现代生态学的中心主题之一是关于生物群落的复杂性与其稳定性之间是否存在关系的持久辩论。在本文中,我们集中在碎石和空间分散的生态系统的稳定性的作用。使用Monte Carlo模拟,我们分析了两个三级模型的食物网:放牧一个与基础物种(即初级生产者)具有无限的食物资源和碎屑一个,其中的基础物种使用碎屑作为食物资源。虽然绝大多数的理论研究忽略了碎屑,从我们的研究结果可以看出,碎屑食物网〈动〉<动>比放牧更稳定,因为碎屑介导的相互作用减弱了物种密度的波动。由于碎屑模型是更复杂的相互作用模式,我们的研究结果提供了新的证据的复杂性作为增强生态系统稳定性的因素之一的倡导者。

英文摘要:

One of the central themes in modern ecology is the enduring debate on whether there is a relationship between the complexity of a biological community and its stability. In this paper, we focus on the role of detritus and spatial dispersion on the stability of ecosystems. Using Monte Carlo simulations we analyze two three level models of food webs: a grazing one with the basal species (i.e. primary producers) having unlimited food resources and a detrital one in which the basal species uses detritus as a food resource. While the vast majority of theoretical studies neglects detritus, from our results it follows that the detrital food web is more stable than its grazing counterpart, because the interactions mediated by detritus damp out fluctuations in species' densities. Since the detritus model is the more complex one in terms of interaction patterns, our results provide new evidence for the advocates of the complexity as one of the factors enhancing stability of ecosystems.

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