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March 2017, № 3 (203)



Bokov D.A., Obidchenko M.P. MORPHOPHYSIOLOGICAL REGULARITY OF FEMALE PYGMY WOOD MOUSE (SYLVAEMUS URALENSIS PALLAS, 1811) PUBERTY: INTRAOVARIAL FACTORS AND ENVIRONMENTAL CONDITIONSPuberty of female pygmy wood mouse, as an ecological phenomenon, is a complex morphophysiological process of forming groups of reproductively active individuals at the population level, and the development of the reproductive system, based on ovaries' organ differentiation. Conditions of animals puberty define functional and reproductive heterogeneity of the elementary populations' structure and the specificity of the active mechanisms of population reproduction adaptation processes. To date, the environmental aspects of female pygmy wood mouse puberty remain to be studied insufficiently. Using population-statistics, histological, morphometric methods we studied the dynamics, volume, direction of ovaries' organ differentiation and functionally-reproductive structure of pygmy wood mouse elementary populations according to fertility level and population density. It was found that in groups with low population density the proportion of females, whose fertility is low (3–5 embryos per individual), increases. It indirectly evidences of earlier puberty. Histological analysis has showed that such animals have ovarian hyperplasia, when just emerged on the surface mice have folliculogenesis and endocrine activity of the gonads. In populations with a high population density up to 70 % of females usually have 6–7 embryos per one. There puberty is blocked. Firstly, there are females with gonadal hypoplasia, when the ovary has featured of embriotipical organ. Secondly, folliculogenesis of some animals is controllable suppressed because of developing glandular structures in ovarian cortex, whose endocrine activity depresses the central influence on the sex glands. Thus, we received information about new mechanisms of reproduction regulation in populations of pygmy wood mouse, based on adaptive control of females puberty.Key words: wood mouse, puberty, the mechanisms of ovarian development, function-reproductive group, reproduction, fertility.

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About this article

Authors: Bokov D.A., Obidchenko M.P.

Year: 2017


Editor-in-chief
Sergey Aleksandrovich
MIROSHNIKOV

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