[Population density as a regulation factor of genetic structure and size of animal populations. Phenotypic variability of reaction to increase in density in Drosophila populations]

Abstract

The presence of considerable level of phenotypic variability for the nature of fertility change in conditions of imago density increase has been shown in Drosophila natural populations. Genetic peculiarities of insects play the main role in its determination. The genotype groups sensitive and stable to density increase exist in the populations. The former have relatively high fertility at low density and low fertility at overcrowding. The latter are of contrary nature of fertility at given density conditions.