[The relationship between allozyme and morphometric variation in pink salmon Oncorhynchus gorbuscha from Southern Sakhalin].

The relationship between allozyme polymorphism and morphometric variation in pink salmon from Southern Sakhalin was examined in order to determine the effects of individual genes. Dramatic differences were found between individuals of some genotypes. For instance, the difference in average male body length between the two prevailing PGDH* genotypes reached 36sigma, which corresponds to 5% contribution to the total variance of the trait.

[Variation in morphometric and genetic characteristics of stellate sturgeon juveniles raised at different densities].

Genetic and size/weight characteristics of stellate sturgeon juveniles were examined under standard and twice lower than standard densities. Viability, growth rate, and variability of juveniles were higher at standard density. Individuals with different genotypes exhibited higher viability and faster growth at different densities, which was particularly pronounced in case of the PGM1 locus.

[Relationship between the reproductive capability of a subdivided population and its genetic structure: computer simulation, the simplest multilocus model].

An original computer model, simulating joint genetic and demographic dynamics of subdivided populations, is proposed. The model accounts for the reverse effect of the genetic structure on the reproductive capability of a population, which is based on a postulated limited set of biallelic loci, controlling variation in an adaptive quantitative trait. The model allows to simulate spreading of the population, originating from a single small colony, which involves genetic and demographic equilibrium (a normal population-genetic process) and reorganization of the genetic structure of the subdivided population upon anthropogenic pressure, associated with a decrease in its reproductive capability (an adverse population-genetic process).