  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 L\'{e}vy 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 evolution of the
population density, consisting of a logistic expression plus multiplicative
noises. Spatial coupling is introduced by means of two spreading mechanisms:
diffusive dispersion and selective migration 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.
