By N. C. Stenseth, W. Z. Lidicker Jr (auth.), Nils Chr. Stenseth, William Z. Lidicker Jr (eds.)
4.1.1 Demographic value restrained populations develop extra speedily than populations from which dispersal is authorized (Lidicker, 1975; Krebs, 1979; Tamarin et at., 1984), and demography in island populations the place dispersal is specific differs vastly from close by mainland populations (Lidicker, 1973; Tamarin, 1977, 1978; Gliwicz, 1980), basically demonstrating the demographic signi ficance of dispersal. the superiority of dispersal in swiftly increasing populations is held to be the simplest proof for presaturation dispersal. simply because dispersal reduces the expansion expense of resource populations, it really is often believed that emigration isn't balanced via immigration, and that mortality of emigrants happens because of stream right into a 'sink' of damaging habitat. If such dispersal is age- or sex-biased, the demo graphy of the inhabitants is markedly affected, due to range ences in mortality within the dispersive intercourse or age classification. Habitat heterogeneity accordingly underlies this interpretation of dispersal and its demographic outcomes, even if the spatial variability of environments isn't assessed in dispersal studies.
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Additional resources for Animal Dispersal: Small mammals as a model
1980) Regulation of population density due to individual differences and patchy environment. Oikos, 35, 185-93. M. (1980a) Space use and social structure in meadow voles, Microtus pennsylvanicus. Behavioural Ecology and Sociobiology, 7, 65-71. M. (1980b) Movement types and weather correlates in free-ranging meadow voles, in Proceedings of the Fourth Eastern Pine and Meadow Vole Symposium (ed. E. Byers), Henderson, North Carolina, pp. 34-42. M. (1980) Inbreeding among zoo animals. Nature, 283, 430-1.
3). Here again, even if the polymorphism is maintained by adaptation to heterogeneous soil colours, the broad spatial extent of the polymorphism shows that dispersal per se is unlikely to affect it: exchange of individuals between populations separated even by many 42 The genetic consequences of dispersal kilometers would not alter gene frequencies significantly. Only genotypedependent movements, in which particular genotypes choose particular microhabitats, could affect polymorphisms of this sort.
1986) Inbreeding in natural populations of birds and mammals, in Conservation Biology: the science of scarcity and diversity (ed. E. Soule), Sinauer, Sunderland, Massachusetts, pp. 35-56. M. (1982) Philopatry, Inbreeding, and the Evolution of Sex, State University of New York Press, Albany, New York, 245 pp. C. (1983) Causes and consequences of dispersal in small mammals, in The Ecology of Animal Movement (eds I. J. Greenwood), Oxford University Press, Oxford, pp. 63-101. H. (1977) Dispersal in island and mainland voles.
Animal Dispersal: Small mammals as a model by N. C. Stenseth, W. Z. Lidicker Jr (auth.), Nils Chr. Stenseth, William Z. Lidicker Jr (eds.)