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Breeding and Survival in a Population of Water Voles

D. Michael Stoddart
Journal of Animal Ecology
Vol. 40, No. 2 (Jun., 1971), pp. 487-494
DOI: 10.2307/3257
Stable URL: http://www.jstor.org/stable/3257
Page Count: 8
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Breeding and Survival in a Population of Water Voles
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Abstract

(1) The sex of trapped water voles (Arvicola terrestris) was determined by feeling the shape of the public symphysis through the abdominal skin. (2) The age (in days) of young voles weighing less than 110 g was estimated from their weight. (3) The breeding performance of the population was estimated. The survival from half grown embryos to trapped young was about 25%. (4) Birthdates are aggregated into blocks, and the largest embryo rates were observed in June. (5) Some voles survive for 2 years, but most disappear when they are between 4 and 5 months old. (6) Entry into the breeding population in 1968 was restricted to those juveniles born before 1 July 1967. (7) Only one generation was produced each year. This is unusual for the genus Arvicola, but environmental factors influencing this were not studied.

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