| 来源类型 | Monograph (IIASA Interim Report) |
| 规范类型 | 报告 |
| Population-level consequences of heterospecific density-dependent movements in predator-prey systems. | |
| Sjödin H; Brännström Å; Soderquist M; Englund G | |
| 发表日期 | 2013 |
| 出版者 | IIASA, Laxenburg, Austria: IR-13-069 |
| 出版年 | 2013 |
| 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 demograhic 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 stabilizig. 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 neighboring patches and when all patches are reached with equal probability. |
| 主题 | Evolution and Ecology (EEP) |
| URL | http://pure.iiasa.ac.at/id/eprint/10698/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/125924 |
| 推荐引用方式 GB/T 7714 | Sjödin H,Brännström Å,Soderquist M,et al. Population-level consequences of heterospecific density-dependent movements in predator-prey systems.. 2013. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| IR-13-069.pdf（1391KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
