title: [Reproduction of European bank vole (Myodes glareolus, Rodentia) under conditions of natural geochemical anomalies].
abstract: Estimates of abundance, morpho-functional state of ovaries, potential and actual fecundity of European bank vole, Myodes glareolus, inhabiting the territories of natural geochemical anomalies that are situated over ultra-basic rock and have an excess content of chrome, nickel, and cobaltare obtained. The population adaptive response to extreme geochemical conditions that facilitates the species survival under unfavorable environmental conditions and is manifested through an increase in potential and actual fecundity, decline of pre-implantation mortality, and decrease in proportion of females with pre-implantation losses is revealed. It is shown that in anomalous areas the intensity of folliculogenesis in mature voles is independent of the population cycle phase. As for immature animals residing within geochemical anomalies, an increase in size and numbers of follicles in ovaries is observed which is indicative of maturation fastening. An increase in potential and actual fecundity, as well as changes in morpho-functional state of ovaries, can be interpreted as means of birth rate accelerating which is supposed to compensate high postnatal mortality and maintain population abundance.
authors.forename: E A
authors.initials: EA
authors.lastname: Baĭtimirova
authors.forename: V P
authors.initials: VP
authors.lastname: Mamina
authors.forename: O A
authors.initials: OA
authors.lastname: Zhigal'skiĭ
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D003411:Arvicolinae / Q000033:anatomy & histology / Q000502:physiology*; D030762:Estrous Cycle; D005260:Female; D005298:Fertility; D008297:Male; D019216:Metals, Heavy; D006080:Ovarian Follicle / Q000166:cytology / Q000378:metabolism*; D012098:Reproduction; D012426:Russia
chemical_list: D019216:Metals, Heavy