The influence of immigration on demography of sympatric voles

• Autorzy: Getz L. L. , Oli M.K. , Hofmann J.E. , McGuire B.
• Języki publikacji: EN

Abstrakty

EN

We studied the influence of immigration on the dynamics ofMicrotus ochrogaster Wagner, 1842 andM. pennsylvanicus Ord, 1815 populations in alfalfa, bluegrass, and tallgrass prairie in east-central Illinois for 25 years. The numbers of immigrants in a site were positively correlated with overall population densities of the species in the vicinity of the study sites and within the study site. Population density of the other species was not correlated with immigration of either species. Immigrants did not differ significantly from residents with respect to sex-ratio and reproductive condition. Persistence of immigrantM. pennsylvanicus was lower than that of resident adults in all three habitats, while that of immigrantM. ochrogaster was lower than that of resident adults in alfalfa, where the species was most abundant. Neither the absolute number of immigrants nor the proportion of the population composed of immigrants indicated an effect of immigrants on among- and within-habitat differences in demography and population fluctuations of either species. Immigrants may have been an important factor in maintenance ofM. pennsylvanicus in alfalfa, a low-quality habitat, but the influence of immigration on the dynamics of populations inhabiting other habitats was insubstantial.

Słowa kluczowe

EN

immigration; prairie vole; Microtus pennsylvanicus; population dynamics; vole; meadow vole; small mammal; Microtus ochrogaster

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 2005
• Tom: 50
• Numer: 3
• Opis fizyczny: p.323-342,fig.,ref.

Twórcy

autor

Getz L. L.

• University of Illinois, 505 S.Goodwin Ave, Urbana, IL 61801, USA

autor

Oli M.K.

autor

Hofmann J.E.

autor

McGuire B.

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