By N. C. Stenseth, W. Z. Lidicker Jr (auth.), Nils Chr. Stenseth, William Z. Lidicker Jr (eds.)
4.1.1 Demographic value constrained 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), essentially 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 fee of resource populations, it really is mostly believed that emigration isn't really balanced by means of immigration, and that mortality of emigrants happens because of circulation right into a 'sink' of adverse habitat. If such dispersal is age- or sex-biased, the demo graphy of the inhabitants is markedly affected, because of fluctuate ences in mortality within the dispersive intercourse or age classification. Habitat heterogeneity therefore underlies this interpretation of dispersal and its demographic effects, 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
S. G. Klein), Yale University Press, New Haven, pp. 117-33. R. D. T. Halpin), University of Chicago Press, Chicago, pp. 257-72. R. and Read, B. (1983) The elimination of inbreeding depression in a captive herd of Speke's Gazelle, in Genetics and Conservation (eds CM. M. Chambers, B. L. Thomas), Benjamin! Cummings, London, pp. 241-61. O. Z. Jr (1980) Population ecology of the taiga vole, Microtus xanthognathus, in interior Alaska. Canadian Journal of Zoology, 58, 1800-12. H. 1 INTRODUCTION What are the genetic consequences of dispersal?
For such behaviour to evolve, there must on the average be benefits received in excess of the disadvantages typically associated with venturing forth into the unknown (Chapter 1). This is therefore an intriguing class of dispersal, deserving of considerable attention. To recognize a disperser as voluntary, one must have evidence that the fitness of that individual would not be expected to drop drastically in the near future if it did not leave home. For example, under some experimental regimes, it may be possible to place a disperser back in its home range and thereby test whether or not this environment has zero survival capacity for the individual.
G. through gradual 'shifting' of the home range (Chapter 2)), and conversely, dispersal may not lead to effective gene movement if dispersers do not reproduce. However, it seems likely that the most important cause of gene movement is in fact 'dispersal', and so it is possible to concentrate on the 'genetic consequences of dispersal' without being misled. The genetic effects of dispersal can be divided into those which arise through the movements of individuals within one generation of one random-mating population, and those which arise through the movements of genes over longer times, and longer distances.
Animal Dispersal: Small mammals as a model by N. C. Stenseth, W. Z. Lidicker Jr (auth.), Nils Chr. Stenseth, William Z. Lidicker Jr (eds.)