[The genotypy structure of a natural Daphnia population based on the phenotypic response on change in the amount of food].

Natural populations of Daphnia are genetically heterogeneous with regard to phenotypic response to modification in the food quantity (a set of metric quantitative traits). In the majority of the traits, three genetically determined response types to the environmental factor studied have been detected: arithmetic means decrease (R1), increase (R2) or remain constant (St) as a result of a decrease in the food quantity. This phenotypic response was shown to occur in the whole set of the metric traits studied, irrespective of physiological specialization.

[Correlation between the sizes of Drosophila populations and parameters of solar activity].

The relationship between the time series of the dynamics of the numbers of experimental populations of Drosophila melanogaster at the preimaginal stage and three heliogeophysical indices: Wolf numbers, the intensity of the 10.7-cm radio flux, and the Kp-index of geomagnetic activity was analyzed. Statistically significant data were obtained indicating that the dynamics of the number of the populations is related to the heliogeophysical factors, and this relationship depends on the phase of the 11-year cycle of solar activity.

[The seasonal variability of Drosophila population according to the individual asymmetry].

The natural Drosophila population is characterized by the presence of directional (DA) and fluctuating (FA) asymmetry of individuals. It was found that genotype has an effect on DA-level. FA evaluated in spring, summer and autumn periods had its maximum value in summer period.

[Population structure of Drosophila on quantitative measure traits and its seasonal changes].

In the Drosophila population the individuals of medium, small and large size prevail in spring, summer and autumn correspondingly. Such differences are genetically determined. Small individuals are characterized by the highest modification variability while the large individuals--by the lowest one.

[Fluctuations in numbers in box populations of Drosophila and selective genetic mechanism of their regulation].

Box populations of Drosophila melanogaster are characterized by two types of periodical fluctuations of numbers: with low and high frequency. High frequency fluctuations are determined by existence of preimago and imago stages and subsequent delay in density-dependent limitation of imago reproduction, duration of which is determined by time of preimago stage. The period of these fluctuations should be limited within two generation, that is confirmed by experimental data.