Dispersal, Environmental Correlation,and Spatial Synchrony in Population Dynamics.
cheap hotels in PoznanBruce E. Kendall, Ottar N.Bjornstad, Jordi Bascompte, Timothy H. Keitt, and William F. Fagan, 2000.
The American Naturalist, 155: 628-636.
ABSTRACT: Many speciesexhibit widespread spatial synchrony in population fluctuations. This patternis of great ecological interest, and can be a source of concern when thespecies is rare. Both dispersal and spatial correlations in the environmenthave been implicated as possible causes of this pattern, but these twofactors have rarely been studied in combination. We develop a spatiallystructured population model, simple enough to obtain analytic solutionsfor the population correlation, that incorporates both dispersal and environmentalcorrelation. We ask whether these two synchronizing factors contributeadditively to the total population covariance. We find that there is alwaysan interaction between these two factors, which is small only when oneor both of the environmental correlation and the dispersal rate are small.The interaction is opposite in sign to the environmental correlation, soin the normal case of positive environmental correlation the populationsynchrony will be lower than predicted by adding the two factors. We alsofind that population synchrony declines as the strength of regulation aroundthe equilibrium increases. These results indicate that dispersal and environmentalcorrelation need to considered in combination as explanations for observedpatterns of population synchrony.
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