Oxana L Zhdanova

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The program "Nb_HetEx" estimates the effective number of breeders (N(b)) that produced the sampled progeny based on genotype counts contained in that sample. When the number of breeders is very small, there is an excess of heterozygotes in their progeny: the smaller the number of breeders, the larger the heterozygote excess. The Nb_HetEx program also(More)
The effective number of breeders (N b) for a cohort of progeny can be estimated from an excess of heterozygotes that arises in progeny produced by finite numbers of parents. In principle, N b is a simple function of the standardized deviation (D) of the proportion of heterozygous progeny from its expectation under random mating. We explored the sampling(More)
We created and examined a mathematical model describing the size and genetic composition dynamics in a population with two age classes, where the survival of both zygotes and adult individuals is determined by one pleioptropic locus. Even under present limitations, as the outside effects of a complex multigenic system are reduced to the case of single(More)
An evolutionary model of density-dependent selection in a two-age population is considered. The model is studied analytically and numerically; the parametric regions of its various dynamic behaviors are determined. An example is used to analyze how an evolutionary increase in the mean fitness results in a more complex population dynamics in a structured(More)
A mathematical model of the changes in the size and genetic diversity of a harvested, single-locus Mendelian population under the conditions of density-dependent selection is analyzed, with a special emphasis on the possibility of conserving or loosing polymorphism as a result of equilibrium harvesting. It is demonstrated that harvesting leads to changes in(More)
A model of density-dependent selection in a Mendelian single-locus population was analyzed in the case where the fitnesses of genotypic forms are exponential functions of the population size. Analytical and numerical studies of the model were performed for a diallelic locus, and parametric regions were established for different dynamic behaviors of the(More)
An investigation of the nature of dynamics of the population size and genetic structure is carried out for a homogeneous ecologically limited population influenced by density-dependent r-K selection in a single diallelic genetic locus. The detailed study of the results of basic types of natural selection is carried out with additional consideration of the(More)
Variation of mitochondrial DNA (mtDNA) was examined in nine populations from three lake-river systems of Chukotka and Kamchatka. Significant differences were found between most of the sockeye salmon samples studied. The genetic differences among populations were not high and often did not correlate with the geographical distances between them. The low(More)
49 The main problem of the dynamic theory of populations [1–5] is the explanation of the type and mechanisms of fluctuating (quasi-periodic and chaotic) dynamics of a population. This problem borders is related to an important applied problem, namely, the development of an optimal strategy for exploitation of commercial species (optimization of harvesting).(More)
This work continues a series of studies on the evolution of a natural population with pronounced seasonal patterns. Model analysis detected a correlation between the duration of ontogenesis and the dynamic behavior patterns of an isolated population (i.e., the structure and dimension of chaotic attractors). For nonlinear models of age-structured population(More)