Home » Animal Dispersal: Small Mammals as a Model by Nils Chr. Stenseth
Animal Dispersal: Small Mammals as a Model Nils Chr. Stenseth

Animal Dispersal: Small Mammals as a Model

Nils Chr. Stenseth

Published October 6th 2012
ISBN : 9789401050333
Paperback
365 pages
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4.1.1 Demographic significance Confined populations grow more rapidly than populations from which dispersal is permitted (Lidicker, 1975- Krebs, 1979- Tamarin et at., 1984), and demography in island populations where dispersal is restricted differsMore4.1.1 Demographic significance Confined populations grow more rapidly than populations from which dispersal is permitted (Lidicker, 1975- Krebs, 1979- Tamarin et at., 1984), and demography in island populations where dispersal is restricted differs greatly from nearby mainland populations (Lidicker, 1973- Tamarin, 1977, 1978- Gliwicz, 1980), clearly demonstrating the demographic signi ficance of dispersal. The prevalence of dispersal in rapidly expanding populations is held to be the best evidence for presaturation dispersal. Because dispersal reduces the growth rate of source populations, it is generally believed that emigration is not balanced by immigration, and that mortality of emigrants occurs as a result of movement into a sink of unfavourable habitat. If such dispersal is age- or sex-biased, the demo graphy of the population is markedly affected, as a consequence of differ ences in mortality in the dispersive sex or age class. Habitat heterogeneity consequently underlies this interpretation of dispersal and its demographic consequences, although the spatial variability of environments is rarely assessed in dispersal studies.