Populations in Space
Over relatively large spatial scales, it is not unusual to have many species that seem to occur everywhere, and even more species that seem to be found in only one or a few locations. For example, Scott Collins and Susan Glenn  showed that in grasslands, each separated by up to 4 km, there were more species occupying only one site (Fig. 4.1, left-most bar) than two or more sites, and also that there are more species occupying all the sites than most intermediate numbers of sites (Fig. 4.1, right-most bar), resulting in a U-shaped frequency distribution. Illke Hanski  coined the rare and common species “satellite” and “core” species, respectively, and proposed an explanation.
KeywordsSource Population Unstable Equilibrium Logistic Growth Habitat Destruction Metapopulation Model
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