Competition and species coexistence in a metapopulation model: Can fast asymmetric migration reverse the outcome of competition in a homogeneous environment?

JOURNAL OF THEORETICAL BIOLOGY

卷:266

Article

Doanh Nguyen Ngoc^2,3  Bravo de la Parra, Rafael^1,2  Zavala, Miguel A.^4,5  Auger, Pierre² 

[1] Univ Alcala de Henares, Dept Matemat, Alcala De Henares 28871, Spain

[2] IRD, UMI UMMISCO 209, F-93143 Bondy, France

[3] IFI, MSI, Hanoi, Vietnam

[4] Univ Alcala de Henares, Dept Ecol, Alcala De Henares 28871, Spain

[5] CIFOR INIA, Madrid 500, Spain

关键词: Migration-competition trade-off;    Dominance reversal;    Time scales;    Aggregation methods;   

DOI  :  10.1016/j.jtbi.2010.06.020

来源: Elsevier

【 摘 要 】

We investigate whether asymmetric fast migration can modify the predictions of classical competition theory and, in particular revert species dominance. We consider a model of two species competing for an implicit resource on a habitat divided into two patches. Both patches are connected through constant migration rates and in each patch local dynamics are driven by a Lotka-Volterra competition system. Local competition is asymmetric with the same superior competitor in both patches. Migration is asymmetric, species dependent and fast in comparison to local competitive interactions. The species and patches are taken to be otherwise similar: in both patches we assume the same carrying capacities for both species, and the same growth rates and pair-wise competition coefficients for each species. We show that global dynamics can be described by a classical Lotka-Volterra competition model. We found that by modifying the ratio of intraspecific migration rates for both species all possible combinations of global species relative dominance can be achieved. We find specific conditions for which the local superior competitor is globally excluded. This is to our knowledge the first study showing that fast asymmetric migration can lead to inferior competitor dominance in a homogeneous environment. We conclude that disparity of temporal scales between migration and local dynamics may have important consequences for the maintenance of biodiversity in spatially structured populations. (C) 2010 Elsevier Ltd. All rights reserved.

【 授权许可】

Free