The genetic structure of model species populations of terrestrial mollusks in conditions of urbanized landscape using the example of Chondrula tridens Müll (Gastropoda, Pulmonata)

Abstract

At the basis of an analysis of morphological and genetic variety, which was done by the polyacry lamyd gel electrophoresis method, the state of population genofond of the model species Chondrula tridens Müll. (the three toothed helix) was studied in conditions of urbanized the forest-steppe landscape of the southern Mid Russia Upland. In most of the studied groups, a real decrease of heterozigocity level is observed, as well as a decrease in allele diversity, which is caused by natural and anthropogenic factors. The automatic genetic processes are considered in populations, and natural selection vectors are determined. The abundance of the studied groups is calculated.

Estimating the state of population gene pools of the specially protected Helicopsis striata (Mollusca, Gastropoda, Pulmonata) species based on DNA markers

“…The ratio of interpopulation dispersion (Vap) and intrapopulation dispersion (Vwp) was 50/50%, and Φ st = 0.497, Nm = 0.288. These data significantly differ from similar indices obtained for the background mollusk species (Snegin, 2012) (Table 5). And the average gene flow was Nm = 0.985 for an individual per generation.…”

“…Variability of 40% accounted for interpopulation differences, and the differentiation index Φ st = 0.404, while the gene flow intensity Nm = 0.360 individuals per generation. It should be noted that the degree of differences between populations was higher for allozyme markers (Snegin, 2012;Snegin, Sychev, 2011). The ratio of interpopulation dispersion (Vap) and intrapopulation dispersion (Vwp) was 50/50%, and Φ st = 0.497, Nm = 0.288.…”

“…We conducted the analysis of the genetic variability of the H. striata populations against the background of a comparison with the similar data that we previously obtained for two background terrestrial mollusk species (Bradybaena fruticum (bush snail) and Chondrula tridens (three dents snail)) inhabiting the studied region and being an indicator of the anthropogenic effects on ecosystems (Snegin, 2010(Snegin, , 2011a(Snegin, , 2011b(Snegin, , 2012(Snegin, , 2013.…”

The genetic structure of populations of specially protected mollusk Cepaea vindobonensis (Mollusca, Gastropoda, Pulmonata) in a north-eastern part of the modern area

“…fruticum, Ch. tridens, H. striata и H. pomatia взяты из наших предыдущих публикаций [38][39][40][41][42][43][44]. То же и для таблицы 11…”

“…fruticum -0,800 ± 0,021, Ch. tridens -0,661 ± 0,013 [38,39], а также для реликтового моллюска Helicopsis striata -0,720 ± 0,080 [39,40]. При этом доля эффективной численности C. vindobonensis оказалась сопоставимой с аналогичным показателем у обитающей здесь вино-градной улитки Helix pomatia -0,870 ± 0,043, имею-щей высокий жизненный потенциал [41].…”