Abstract
Differences in the mechanisms regulating reproduction between the northern red-backed vole (Clethrionomys rutilus) and large-toothed red-backed vole (Cl. rufocanus) have been revealed under vivarium conditions. In Cl. rufocanus, the date of birth is the most important “signal” factor for sexual maturation of male young of the year, while the effect of population density is significant only for males of the spring generation. Males of the summer generation fail to mature in the same year and are completely excluded from reproduction, which may be accounted for by a rise in the level of corticosterone (measured in fecal samples). Such a mechanism for regulating the numbers of reproductive individuals is absent in Cl. rutilus voles. Throughout the breeding season, males of this species respond to high population density by a decrease in the rate of sexual maturation. No definite relationship between sexual maturation and the level of adrenocortical activity has been revealed in Cl. rutilus.
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Original Russian Text © L.B. Kravchenko, E.L. Zavjalov, N.S. Moskvitina, 2011, published in Zoologicheskii Zhurnal, 2011, No. 12, pp. 1522–1529.
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Kravchenko, L.B., Zavjalov, E.L. & Moskvitina, N.S. Sexual maturation and age-related dynamics of corticosterone in Clethrionomys rutilus and Cl. rufocanus voles (Rodentia, Cricetidae) under experimental conditions. Biol Bull Russ Acad Sci 39, 627–633 (2012). https://doi.org/10.1134/S1062359012070060
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DOI: https://doi.org/10.1134/S1062359012070060