Noise induced phenomena in Lotka-Volterra systems

被引：87
作者：
Spagnolo, B [1 ]
Fiasconaro, A
Valenti, D
机构：
[1] Univ Palermo, Ist Nazl Fis Mat, Unita Palermo, I-90128 Palermo, Italy
[2] Univ Palermo, Dipartimento Fis & Tecnol Relat, I-90128 Palermo, Italy
来源：
FLUCTUATION AND NOISE LETTERS | 2003年 / 3卷 / 02期
关键词：
statistical mechanics; population dynamics; noise induced effects; Lotka-Volterra equations;
D O I：
10.1142/S0219477503001245
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
We study the time evolution of two ecosystems in the presence of external noise and climatic periodical forcing by a generalized Lotka-Volterra (LV) model. In the first ecosystem, composed by two competing species, we find noise induced phenomena such as: (i) quasi deterministic oscillations, (ii) stochastic resonance, (iii) noise delayed extinction and (iv) spatial patterns. In the second ecosystem, composed by three interacting species (one predator and two preys), using a discrete model of the IV equations we find that the time evolution of the spatial patterns is strongly dependent on the initial conditions of the three species.
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收藏
页码：L177 / L185
页数：9
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