The intra-population structure peculiarities of terrestrial mollusk Helicopsis striata on the example of the model isolated population located in the south of Mid-Russian Upland are described in the article. The morphological differentiation is revealed and the demographic characteristics of subpopulations are defined. The gene pool structure of the researched groups is studied on the basis of the isoenzyme analysis. The effective number is calculated and the forecast of the population further existence term is given.
specially protected kind, terrestrial mollusk, forest-steppe, intra-population structure
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