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      Metapopulation dynamics in a complex ecological landscape.

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          Abstract

          We propose a general model to study the interplay between spatial dispersal and environment spatiotemporal fluctuations in metapopulation dynamics. An ecological landscape of favorable patches is generated like a Lévy dust, which allows to build a range of patterns, from dispersed to clustered ones. Locally, the dynamics is driven by a canonical model for the time evolution of the population density, consisting of a logistic expression plus multiplicative noises. Spatial coupling is introduced by means of two spreading mechanisms: diffusion and selective dispersal driven by patch suitability. We focus on the long-time population size as a function of habitat configurations, environment fluctuations, and coupling schemes. We obtain the conditions, that the spatial distribution of favorable patches and the coupling mechanisms must fulfill, to grant population survival. The fundamental phenomenon that we observe is the positive feedback between environment fluctuations and spatial spread preventing extinction.

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          Author and article information

          Journal
          Phys Rev E Stat Nonlin Soft Matter Phys
          Physical review. E, Statistical, nonlinear, and soft matter physics
          American Physical Society (APS)
          1550-2376
          1539-3755
          Aug 2015
          : 92
          : 2
          Affiliations
          [1 ] Department of Physics, PUC-Rio, Rio de Janeiro, Brazil.
          [2 ] Institute of Science and Technology for Complex Systems, Rio de Janeiro, Brazil.
          Article
          10.1103/PhysRevE.92.022714
          26382439
          2db29feb-32df-48bb-ac38-fff4da52874c
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