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A I Pudovkin

Publications and source records attributed to A I Pudovkin.

7 recordsLinked to original sources
PubMed2005

[Macrogeographic genetic variability in the gastropod mollusk Littorina sitkana from the northwest Pacific].

Variation at four highly polymorphic allozyme loci (inorganic pyrophosphatase, peptidase, and two esterase loci) was examined in 25 settlements of the marine snail Littorina sitkana (Mollusca, Gastropoda). The sampling localities covered a wide part of the species range: from the Peter the Great Bay (the Sea of Japan) at the southwest to the Mednyi Island (Commander Islands) at the northeast. Like other littorines lacking the pelagic stage, L. sitkana was characterized by significant genetic differentiation (G(ST) for the pooled sample was 0.310). Cluster analysis and nonmetric multidimensional scaling conducted on a matrix of pairwise genetic distances between all of the settlements studied revealed four genetically different groups: southern Primorye, northern Prymorye, Sakhalin, and Kuril-Commanders. The population-genetic structure of the L. sitkana settlements is close to that described by the isolation-by-distance and stepping-stone models: the geographic and the genetic distances between the most settlements examined are distinctly correlated.

Animals↗
PubMed2000

[Genetically dispersed effective population size determined by mitochondrial genes].

A formula for variance effective population size (Ne) for analysis of mitochondrial genes is deduced and discussed. Only the female part of the population is taken into account; hence, Ne is, in the given case, the effective number of females. Ne = m2(N - 1)/sigma 2, where N is the number of females, sigma 2 is the variance of the reproductive contributions of individual females (measured as the number of their daughters that are part of the next generation), and m is the mean number of daughters per female.

Female↗
PubMed1996

On the potential for estimating the effective number of breeders from heterozygote-excess in progeny.

The important parameter of effective population size is rarely estimable directly from demographic data. Indirect estimates of effective population size may be made from genetic data such as temporal variation of allelic frequencies or linkage disequilibrium in cohorts. We suggest here that an indirect estimate of the effective number of breeders might be based on the excess of heterozygosity expected in a cohort of progeny produced by a limited number of males and females. In computer simulations, heterozygote excesses for 30 unlinked loci having various numbers of alleles and allele-frequency profiles were obtained for cohorts produced by samples of breeders drawn form an age-structured population and having known variance in reproductive success and effective number. The 95% confidence limits around the estimate contained the true effective population size in 70 of 72 trials and the Spearman rank correlation of estimated and actual values was 0.991. An estimate based on the heterozygote excess might have certain advantages over the previous estimates, requiring only single-locus and single-cohort data, but the sampling error among individuals and the effect of departures from random union of gametes still need to be explored.

Breeding↗