Published online by Cambridge University Press: 05 July 2011
Climate change is one of the greatest long-term potential threats to the functional integrity of the biosphere. Although the likely effects of climate change on ecosystem function and the geographic distributions of organisms have been extensively studied, their demographic effects are less well understood. In order to examine the effects of climate change on populations in their landscape context, I integrate results from two different modeling approaches to examine the effects of climate change on the demography and dispersal of organisms. I use simple two-patch metapopulation models and more complex stochastic stage-structured multiregional models of stream fish populations. Plausible effects of climate change on dispersal rates, and on spatial population structure, may destabilize metapopulations and make them susceptible to further anthropogenic or natural perturbations. The findings suggest several hypotheses to be tested empirically, and imply that future biodiversity conservation strategies will need to account for the landscape-level effects of climate change and attendant changes in land use.
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