全球智库信息集成服务系统(G2TT): Population-level consequences of heterospecific density-dependent movements in predator-prey systems.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1016/j.jtbi.2013.09.019
	Population-level consequences of heterospecific density-dependent movements in predator-prey systems.
	Sjödin H; Brännström Å; Söderquist M; Englund G
发表日期	2014
出处	Journal of Theoretical Biology : 93-106
出版年	2014
语种	英语
摘要	In this paper we elucidate how small-scale movements, such as those associated with searching for food and avoiding predators, affect the stability of predator-prey dynamics. We investigate an individual-based Lotka-Volterra model with density-dependent movement, in which the predator and prey populations live in a very large number of coupled patches. The rates at which individuals leave patches depend on the local densities of heterospecifics, giving rise to one reaction norm for each of the two species. Movement rates are assumed to be much faster than demographics rates. A spatial structure of predators and prey emerges which affects the global population dynamics. We derive a criterion which reveals how demographic stability depends on the relationships between the per capita covariance and densities of predators and prey. Specifically, we establish that a positive relationship with prey density and a negative relationship with predator density tend to be stabilizing. On a more mechanistic level we show how these relationships are linked to the movement reaction norms of predators and prey. Numerical results show that these findings hold both for local and global movements, i.e., both when migration is biased towards neighbouring patches and when all patches are reached with equal probability.
主题	Evolution and Ecology (EEP)
关键词	Moment closure Population dynamics Spatial structure Species coexistence Stochastic processes
URL	http://pure.iiasa.ac.at/id/eprint/11029/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/130123
推荐引用方式 GB/T 7714	Sjödin H,Brännström Å,Söderquist M,et al. Population-level consequences of heterospecific density-dependent movements in predator-prey systems.. 2014.