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1 May 2003 POPULATION DYNAMICS OF EUROPEAN GROUND SQUIRRELS (SPERMOPHILUS CITELLUS) IN A SUBURBAN AREA
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Abstract

We monitored European ground squirrels (Spermophilus citellus) in a recreation area near Vienna, Austria, over a 7-year period to follow their population dynamics. Data were obtained by mark–recapture and daily checklists in an attempt to track the fates of individuals present in a defined area. Abundance of nonjuveniles present in spring decreased from 56.0 individuals/ha in 1992 to 6.3 individuals/ha in 1998. Litter size and yearling-male reproduction were inversely related to density, whereas immigration, juvenile survival, and proportions of nonjuvenile males exhibited a positive relationship. We conclude that the study population had been a dispersal sink and that ceasing immigration combined with poor local survival caused the population to crash. The temporal coincidence of these 2 effects indicates an extrinsic factor acting both on residents and potential immigrants.

Ilse E. Hoffmann, Eva Millesi, Susanne Huber, Lammina G. Everts, and John P. Dittami "POPULATION DYNAMICS OF EUROPEAN GROUND SQUIRRELS (SPERMOPHILUS CITELLUS) IN A SUBURBAN AREA," Journal of Mammalogy 84(2), 615-626, (1 May 2003). https://doi.org/10.1644/1545-1542(2003)084<0615:PDOEGS>2.0.CO;2
Accepted: 25 July 2002; Published: 1 May 2003
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