Biodiversity in model ecosystems, I:: coexistence conditions for competing species
Biodiversity in model ecosystems, I:: coexistence conditions for competing species
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DOI：
10.1016/j.jtbi.2005.02.005
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发表时间：
2005-08-21
影响因子：
2
通讯作者：
Valleriani, A
中科院分区：
文献类型：
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作者：
Bastolla, U;Lässig, M;Valleriani, A
这是我们讨论竞争对物种群落生物多样性施加的限制的两篇论文中的第一篇。在第一篇文章中，我们研究了种群动力学方程不动点上竞争物种的共存问题。对于许多简单的模型，这对生产力分布的宽度施加了限制，生态系统越多样化，这种限制就越严重(Theor，1994)。波普尔。比奥尔。45,227-276)。在这里，我们回顾和推广这种分析，超越了以前工作中使用的竞争矩阵的“平均场”近似，并将其扩展到结构化食物网。在所有分析的情况下，我们得到了生物多样性和竞争之间的定性相似关系：生产力分布越窄，更多的物种可以稳定共存。我们讨论了这一结果，与环境波动一起，如何限制了一个营养水平可以容纳的最大生物多样性。(C)2005爱思唯尔有限公司。保留所有权利。
This is the first of two papers where we discuss the limits imposed by competition to the biodiversity of species communities. In this first paper, we study the coexistence of competing species at the fixed point of population dynamic equations. For many simple models, this imposes a limit on the width of the productivity distribution, which is more severe the more diverse the ecosystem is (1994, Theor. Popul. Biol. 45, 227-276). Here we review and generalize this analysis, beyond the "mean-field" -like approximation of the competition matrix used in previous works, and extend it to structured food webs. In all cases analysed, we obtain qualitatively similar relations between biodiversity and competition: the narrower the productivity distribution is, the more species can stably coexist. We discuss how this result, considered together with environmental fluctuations, limits the maximal biodiversity that a trophic level can host. (c) 2005 Elsevier Ltd. All rights reserved.