ファイル | |
言語 |
英語
|
著者 |
Saito, Yasuhisa
|
内容記述(抄録等) | Many natural predator and prey populations persist while their densities show sustained oscillations. Hence these populations must be regulated in such a way that the densities are kept away from the values where extinction is likely to occur. On the other hand, nonspatial simple predator-prey models show vigorous oscillations that can bring the populations to the brink of extinction or beyond. Predator-prey systems that are kept in the laboratory also tend to show fluctuations in densities that are severe enough to drive them to extinction. Since the amount of space that laboratory populations live in is small compared to that of natural populations, one is readily led to the hypothesis that spatial interactions must contribute to the regulation of natural predator-prey systems. In this paper, we construct a simplest type of spatially interacting populations by taking into account constant immigration of prey for a predator-prey model with a Holling type II functional response and derive necessary and sufficient conditions for both the uniqueness of limit cycles and the global asymptotic stability of a positive equilibrium. From these results, it is fully suggested (mathematically) that the prey immigration dampens the large fluctuations emerging in the predator-prey model and also stabilizes a positive equilibrium globally.
|
主題 | predator-prey system
limit cycles
Holling type II functional response
regulation of populations
prey immigration
global asymptotic stability
Liénard system
|
掲載誌名 |
SIAM journal on applied mathematics
|
巻 | 72
|
号 | 1
|
開始ページ | 299
|
終了ページ | 316
|
ISSN | 00361399
|
発行日 | 2012-02-09
|
DOI | |
出版者 | Society for Industrial and Applied Mathematics
|
資料タイプ |
学術雑誌論文
|
ファイル形式 |
PDF
|
権利関係 | Copyright © 2012 Society for Industrial and Applied Mathematics
|
著者版/出版社版 |
出版社版
|
部局 |
(旧組織)大学院総合理工学研究科
|