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 quickly 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 easiest facts for presaturation dispersal. simply because dispersal reduces the expansion price of resource populations, it really is as a rule believed that emigration isn't really balanced by means of immigration, and that mortality of emigrants happens due to move right into a 'sink' of negative habitat. If such dispersal is age- or sex-biased, the demo graphy of the inhabitants is markedly affected, by reason of vary ences in mortality within the dispersive intercourse or age classification. Habitat heterogeneity as a result underlies this interpretation of dispersal and its demographic effects, even supposing the spatial variability of environments isn't assessed in dispersal studies.
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Extra resources for Animal Dispersal: Small mammals as a model
This definition can be ambiguous, since it is not obvious when a gene has been incorporated into a new gene pool. Clearly, dispersing individuals must breed at their new site in order for gene flow to occur. However, a much more stringent requirement has often been applied: that an allele should not only enter the new population, but should also not be eliminated from it by natural selection. Thus, hybrid zones have been taken to delimit separate biological species, on the grounds that because they involve stable genetic differentiation, alleles cannot successfully introgress across them (Dobzhansky, 1940, p.
E. Byers), Henderson, North Carolina, pp. 34-42. M. (1980) Inbreeding among zoo animals. Nature, 283, 430-1. Mayr, E. (1961) Cause and effect in biology. Science, 134, 1501-6. Moore, J. and Ali, R. (1984) Are dispersal and inbreeding avoidance related? Animal Behaviour, 32, 94-112. Nevo, E. (1978) Genetic variation in natural populations: patterns and theory. Theoretical Population Biology, 13, 121-77. S. (1985) Limiting resources and territoriality in microtine rodents. American Naturalist, 126, 1-15.
4 A CLASSIFICAnON OF DISPERSAL This overview of who disperses and the factors motivating this behaviour emphasizes the need for a classification scheme in which the heterogeneity and complexity of the phenomenon can be portrayed. We propose a system based on proximate motivating factors, acknowledging that these are often difficult to determine. Other possible criteria of interest, such as ultimate motivating factors or relation to population carrying capacity, are even more difficult to assess.
Animal Dispersal: Small mammals as a model by N. C. Stenseth, W. Z. Lidicker Jr (auth.), Nils Chr. Stenseth, William Z. Lidicker Jr (eds.)