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...ith each other, could increasesunder the impact of stress. This indicates an opportunity to reveal changes insdevelopmental stability through the study of the limited set of morphologicalscharacters (=-=Mather 1953-=-, Zakharov 1987, 1989). [27 ] 28 A. V. Valetsky et al. In this study, we tried to find out if social stress affects developmental stability.sSocial stress has already been suggested as a possible caus...

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...ects to humans, does not differ from 0 (eg Reeve 1960, Bailit et al. 1970, Learyset al. 1985). Stress impact of overpopulation was demonstrated in both natural populationssand laboratory experiments (=-=Christian and Davis 1964-=-, Shilov 1977, Moshkin etsal. 1990). Some biochemical, morphological and behavioral changes were observedsfor the progeny of females stressed during pregnancy (Thompson 1957, Naumenkoset al. 1990, Pra...

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...he conclusion established in many studies that heritability o (h ) of fluctuating asymmetry for various characters in different species, fromsinsects to humans, does not differ from 0 (eg Reeve 1960, =-=Bailit et al. 1970-=-, Learyset al. 1985). Stress impact of overpopulation was demonstrated in both natural populationssand laboratory experiments (Christian and Davis 1964, Shilov 1977, Moshkin etsal. 1990). Some biochem...

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...ects developmental stability.sSocial stress has already been suggested as a possible cause of disturbance ofsdevelopmental stability revealed at the peak year in a cyclic population of smallsmammals (=-=Zakharov et al. 1991-=-). To get a more direct answer to the question weshave modelled such stress in a laboratory strain of rats. To establish thesdeterioration of developmental stability under the impact of social stress ...

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...r, could increasesunder the impact of stress. This indicates an opportunity to reveal changes insdevelopmental stability through the study of the limited set of morphologicalscharacters (Mather 1953, =-=Zakharov 1987-=-, 1989). [27 ] 28 A. V. Valetsky et al. In this study, we tried to find out if social stress affects developmental stability.sSocial stress has already been suggested as a possible cause of disturbanc...

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...bility was registered under the stress impact of various chemical and physicalsfactors that could be interpreted as a toxic effect (Siegel and Smookler 1973, Siegelsand Doyle 1975, Doyle et al. 1977, =-=Pankakoski et al. 1992-=-). The social stress wouldsbe essential to establish the same reaction of an organism. In a narrow sense, itswould be an experimental justification to interpret a decrease in developmentalsstability a...

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...ry experiments (Christian and Davis 1964, Shilov 1977, Moshkin etsal. 1990). Some biochemical, morphological and behavioral changes were observedsfor the progeny of females stressed during pregnancy (=-=Thompson 1957-=-, Naumenkoset al. 1990, Pratt and Lisk 1990). Our data on laboratory rats revealed an obvious developmental stabilitysdecrease in the progeny of females exposed to social stress at different stages of...

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...f developmentalsstability was registered under the stress impact of various chemical and physicalsfactors that could be interpreted as a toxic effect (Siegel and Smookler 1973, Siegelsand Doyle 1975, =-=Doyle et al. 1977-=-, Pankakoski et al. 1992). The social stress wouldsbe essential to establish the same reaction of an organism. In a narrow sense, itswould be an experimental justification to interpret a decrease in d...

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...964, Shilov 1977, Moshkin etsal. 1990). Some biochemical, morphological and behavioral changes were observedsfor the progeny of females stressed during pregnancy (Thompson 1957, Naumenkoset al. 1990, =-=Pratt and Lisk 1990-=-). Our data on laboratory rats revealed an obvious developmental stabilitysdecrease in the progeny of females exposed to social stress at different stages ofstheir pregnancy, comparing with a control ...

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...iffer from 0 (eg Reeve 1960, Bailit et al. 1970, Learyset al. 1985). Stress impact of overpopulation was demonstrated in both natural populationssand laboratory experiments (Christian and Davis 1964, =-=Shilov 1977-=-, Moshkin etsal. 1990). Some biochemical, morphological and behavioral changes were observedsfor the progeny of females stressed during pregnancy (Thompson 1957, Naumenkoset al. 1990, Pratt and Lisk 1...

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...o any stress. In previous studies deterioration of developmentalsstability was registered under the stress impact of various chemical and physicalsfactors that could be interpreted as a toxic effect (=-=Siegel and Smookler 1973-=-, Siegelsand Doyle 1975, Doyle et al. 1977, Pankakoski et al. 1992). The social stress wouldsbe essential to establish the same reaction of an organism. In a narrow sense, itswould be an experimental ...

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...c shrew population in central Siberia (Zakharov et al. 1991). Material and methods An experiment was conducted on laboratory rats Rattus norvegicus Berkenhout, 1769 of the strains“Tryon maze bright” (=-=Wahlsten 1972-=-). Social stress was modeled by keeping 2 pregnant females withs8 males in one cage (32 x 57 x 20 cm). In the first experiment (group 1) females were exposed to thesstress during the first 15 days of ...

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...esponds to the conclusion established in many studies that heritability o (h ) of fluctuating asymmetry for various characters in different species, fromsinsects to humans, does not differ from 0 (eg =-=Reeve 1960-=-, Bailit et al. 1970, Learyset al. 1985). Stress impact of overpopulation was demonstrated in both natural populationssand laboratory experiments (Christian and Davis 1964, Shilov 1977, Moshkin etsal....