Abstracts

Genetic Bases of Biodiversity

The studing of genotype-environment interaction in nature population is important for understanding in ecosystems dynamics action. The effect of two nutrient regimes: 100 and 10 thousands cell algae on 1 ml, in following 100t and 10t respectively, for 14 Daphnia pulex clones during two generations (F1 and F2 from parental females, was captured in ephemeral reservoir in around of Irkutsk) was researched. 50 individuals for every generations and 25 for every nutrient regimes was used for morphological analyses. The following morphological traits were studied: 1) total body length, 2) shell width, 3) head width, 4) antennula length, 5) distance between rostrum top and antenna base, 6) length tail needle, 7) dorsal width, 8) ventral width. It was shown that all researched traits obtain statistically significant difference of average between condition maintaining. More high average is characterized individuals maintaining for 100t. Estimate of effect genetic factors on obtain changing general population average is essential aim for this investigation. For resolving this aim we were used two approach’s. First, more simple, but necessary effective - accounting index of reactions (IR), its is value of phenotypical plasticity. Second approach is concluded by used analyses of variance (two-factors scheme with interaction), where first factor is assesses interclonal dispersion and second factors - internutrient one. In this scheme interaction is estimate degree of genetic determination for phenotypical variability in contrast environmental condition. In result of using this approach was obtain: firstly, high level of influence genetic factors for phenotypical variability and secondly, presence genotypical heterogeneosity for that character in daphnia nature population.

Note. Abstracts are published in author's edition

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