Ludmila E Savinetskaya

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The progression of tall-grass steppes has caused a consequent reduction in the abundance of the little ground squirrel. By the beginning of this century, its population had fallen to zero and was not compensated by other rodent species’ biomass. The little ground squirrel is a biocenotically valuable species for a semidesert terrain, since it participates(More)
143 Fragmentation of distribution ranges and their reduction frequently influence the genetic structure of wild animal populations interfering with gene exchange between different parts of the distribution area, decreasing effective population size, and elevat ing the level of inbreeding [1]. In small isolated popu lations, gene drift can decrease genetic(More)
Results of studies in 1999–2009 of the dynamics of five isolated colonies of the speckled ground squirrel (Spermophilus suslicus) at the northern boundary of the habitat of this species (Zaraiskii area, Moscow oblast) are given. An abrupt decrease in the number of this species in colonies was established, as was a multifold decrease (up to 70–90%) in(More)
523 Long term isolation of populations (in particular, island ones) usually results in gene flow limitation, losses in genetic diversity, decrease in the heterozygos ity level, and increase in the inbreeding level [4, 7]. This, in turn, decreases their resistance to external fac tors under changing environmental conditions and increases the risk of(More)
Obligately hibernating mammals, including most of ground-dwelling sciurids, are especially limited in time and energy for successful reproduction. During the short active season between periods of hibernation, they must not only give birth to the offspring and raise the young, but also gain the body weight necessary for surviving through winter and(More)
Theory predicts that due to their resilience, ecosystems and populations are expected to respond to environmental changes not gradually, but in a nonlinear way with sudden abrupt shifts. However, it is not easy to observe and predict the state-and-transition dynamics in the real world because of time lags between exogenous perturbations and species(More)
The results of interspecific crosses of the social vole Microtus socialis with the Altai vole M. obscurus, the East European vole M. rossiaemeridionalis, and the Transcaspian vole M. transcaspicus are presented. The role of the sperm head structure in the reproductive isolation of this species was studied. Hybrids were obtained in five of the six crossing(More)
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