Effects of demographic stochasticity on biological community assembly on evolutionary time scales

被引：10

作者：

Murase, Yohsuke ^{[1
]}

Shimada, Takashi ^{[1
]}

Ito, Nobuyasu ^{[1
]}

Rikvold, Per Arne ^{[2
,3
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

[2] Florida State Univ, Ctr Mat Res & Technol, Tallahassee, FL 32306 USA

[3] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

来源：

PHYSICAL REVIEW E | 2010年 / 81卷 / 04期

关键词：

LONG-TERM EVOLUTION; TANGLED NATURE; MODEL; STABILITY; COMPLEX; FLUCTUATIONS; NETWORK; BIODIVERSITY; CONNECTANCE; COEVOLUTION;

D O I：

10.1103/PhysRevE.81.041908

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We study the effects of demographic stochasticity on the long-term dynamics of biological coevolution models of community assembly. The noise is induced in order to check the validity of deterministic population dynamics. While mutualistic communities show little dependence on the stochastic population fluctuations, predator-prey models show strong dependence on the stochasticity, indicating the relevance of the finiteness of the populations. For a predator-prey model, the noise causes drastic decreases in diversity and total population size. The communities that emerge under influence of the noise consist of species strongly coupled with each other and have stronger linear stability around the fixed-point populations than the corresponding noiseless model. The dynamics on evolutionary time scales for the predator-prey model are also altered by the noise. Approximate 1/f fluctuations are observed with noise, while 1/f(2) fluctuations are found for the model without demographic noise.

引用

页数：14

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