Animal Dispersal: Small mammals as a model by N. C. Stenseth, W. Z. Lidicker Jr (auth.), Nils Chr.

By N. C. Stenseth, W. Z. Lidicker Jr (auth.), Nils Chr. Stenseth, William Z. Lidicker Jr (eds.)

4.1.1 Demographic importance constrained populations develop extra swiftly than populations from which dispersal is allowed (Lidicker, 1975; Krebs, 1979; Tamarin et at., 1984), and demography in island populations the place dispersal is particular differs tremendously from close by mainland populations (Lidicker, 1973; Tamarin, 1977, 1978; Gliwicz, 1980), in actual fact demonstrating the demographic signi­ ficance of dispersal. the superiority of dispersal in quickly increasing populations is held to be the easiest facts for presaturation dispersal. simply because dispersal reduces the expansion cost of resource populations, it really is typically believed that emigration isn't balanced through 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, on account of range­ ences in mortality within the dispersive intercourse or age category. Habitat heterogeneity therefore underlies this interpretation of dispersal and its demographic results, even if the spatial variability of environments isn't assessed in dispersal studies.

Show description

Read Online or Download Animal Dispersal: Small mammals as a model PDF

Best ecology books

Reviews of Environmental Contamination and Toxicology Volume 206

RECT 206 edited by way of David Whitacre. - ahead. - Preface. - Physiological diversifications of under pressure Fish to Polluted Environments: position of warmth surprise Proteins by means of Ekambaram Padmini. - Phytoremediation: A Noble process for usage of Iron-Ore Wastes by means of Monalisa Mohanty, Nabin Kumar Dhal, Parikshita Patra, Biswesar Das and Palli Sita Rama Reddy.

Nonverbal Communication Across Disciplines: Paralanguage, Kinesics, Silence, Personal and Environmental Interaction v.2

Paralanguage and kinesics outline the tripartite nature of speech. quantity II builds on Poyatos' publication Paralanguage (1993)--reviewed by means of Mary Key as "the such a lot amplified description of paralanguage to be had today". It covers our simple voice elements; the numerous basic or irregular voice forms; the communicative makes use of of physiological and emotional reactions like laughter, crying, sighing, coughing, sneezing, and so forth.

Production Ecology of British Moors and Montane Grasslands

The overseas organic Programme (IBP) used to be a cooperative attempt at the a part of scientists in the course of the global, whose aim was once an built-in examine of the fundamental procedures of organic productiveness. The problem of assembly the expanding foodstuff wishes of a becoming inhabitants calls for optimal productiveness from common and controlled ecosystems, which has no longer hitherto suitable with the upkeep of environmental caliber.

Additional info for Animal Dispersal: Small mammals as a model

Sample text

1960) Innate and environmental dispersal in individual vertebrates. American Midland Naturalist, 63, 152-61. Kalela, O. ). ), 55, 1-72. B. (1974) Population genetics: reevaluation of genetic variation. Science, 184,452-4. Lack, D. (1968) Ecological Adaptations for Breeding in Birds, Metheun, London, 409 pp. Z. Jr (1962) Emigration as a possible mechanism permitting the regulation of population density below carrying capacity. American Naturalist, 96,29-33. Z. B. Golley, K. Petrusewicz and L. Ryszkowski), Cambridge University Press, London, pp.

G. Patton and Yang, 1977; Grant, 1980; Pounds and Jackson, 1981; Dillon, 1984); such correlations are more obviously explained by the homogenizing effect of gene flow than by any increase in environmental differences with physical distance. More directly, Pounds and Jackson (1981) have shown that populations of the fence lizard, Sceloporu5 grammicu5, which are separated by rivers differ more in morphology than populations a similar distance apart, but not separated by major barriers to dispersal.

4). Nevertheless, these clines are usually much narrower than the species' range, and give direct evidence that gene flow does not prevent selection from producing local adaptation and divergence. The effects of drift are harder to demonstrate: though many analyses implicitly assume that spatial differentiation is caused by drift, it is hard to distinguish the action of drift from that of divergent selection. However, in a few cases, spatial differentiation has been shown to be greater in regions of low neighbourhood size (Cavalli Sforza, 1969; Selander, 1970; Patton and Feder, 1978), indicating that it has been produced by sampling drift.

Download PDF sample

Rated 4.33 of 5 – based on 34 votes

Related posts