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Effects of colonization asymmetries on metapopulation persistence

Author

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  • Vuilleumier, Séverine
  • Bolker, Benjamin M.
  • Lévêque, Olivier

Abstract

Ocean currents, prevailing winds, and the hierarchical structures of river networks are known to create asymmetries in re-colonization between habitat patches. The impacts of such asymmetries on metapopulation persistence are seldom considered, especially rarely in theoretical studies. Considering three classical models (the island, the stepping stone and the distance-dependent model), we explore how metapopulation persistence is affected by (i) asymmetry in dispersal strength, in which the colonization rate between two patches differs in direction, and (ii) asymmetry in connectivity, in which the overall colonization pattern displays asymmetry (circulating or dendritic networks). Viability can be drastically reduced when directional bias in dispersal strength is higher than 25%. Re-colonization patterns that allow for strong local connectivity provide the highest persistence compared to systems that allow circulation. Finally, asymmetry has relatively weak effects when metapopulations maintain strong general connectivity.

Suggested Citation

  • Vuilleumier, Séverine & Bolker, Benjamin M. & Lévêque, Olivier, 2010. "Effects of colonization asymmetries on metapopulation persistence," Theoretical Population Biology, Elsevier, vol. 78(3), pages 225-238.
    • Handle: RePEc:eee:thpobi:v:78:y:2010:i:3:p:225-238
    DOI: 10.1016/j.tpb.2010.06.007
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    References listed on IDEAS

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    1. Chaput-Bardy, A. & Fleurant, C. & Lemaire, C. & Secondi, J., 2009. "Modelling the effect of in-stream and overland dispersal on gene flow in river networks," Ecological Modelling, Elsevier, vol. 220(24), pages 3589-3598.
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