集合种群水平上的抽彩式竞争

把Allee效应引入两个物种在集合种群水平上的抽彩式竞争系统,用相平面分析法和模拟研究了模型的动态行为.结果表明,似Allee效应本身可以使得竞争系统的不稳定平衡点增多,并且在这样的系统中,即使两个物种的斑块占有率都比较高,两个物种仍然可能在集合种群水平上趋于灭绝,而如果没有Allee效应,不管这两个物种的斑块占有率如何组合,都不会使得两个竞争种都灭绝.这些结论对自然保护将有重要的意义.

The syetric competitive dynamics of metapopulations subject to an Allee-like effect

In this paper, the Allee-like effect is introduced into a metapopulation model of two-species (symmetric) competition. Phase plane analysis and simulation was used to investigate the dynamics of the models. Combining simple modeling and simulations, it is demonstrated that the Allee-like effect alone could lead to alternative equilibriums in two-species symmetric competitive systems at the metapopulation level. In such systems, metapopulations of both species may become extinct even if their colonization rates are high. In contrast, in the metapopulation model without Allee-like effects, neither high nor low colonization rate combinations would lead to extinction of both competitors. These conclusions may have important implications for conservation.