Assessment of a state of population gene pools of terrestrial mollusks in conditions of influence of ore dressing combines on example Bradybaena fruticum Müll. (Gastropoda, Pullmonata)

2017

Abstract⎯Based on DNA markers (RAPD and ISSR), the state of gene pools of nineteen populations of the specially protected relict Helicopsis striata (Mollusca, Gastropoda, Pulmonata) species in conditions of the Central Russian Upland south was studied. The data obtained demonstrate a high degree of subdivision of the population (Ф st = 0.404, G st = 0.358) and an increased level of homozygosity in a number of groups inhabiting the industrial zone and steppe biotopes. A significant correlation between the intensity of the gene flow and geographical distances between populations (R = 0.571 ± 0.052) was registered; this corresponds to isolation by the distance model. The effective size values calculated based on the subdivision indices were significantly lower than the similar effective size of the background mollusk species.

Section: Resultsmentioning

confidence: 99%

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

2017

“…Earlier, the same picture in the investigated region was obtained for another repre sentative species of terrestrial mollusk, Bradybaena fructicum Müll. (Snegin, 2010).…”

Section: Resultsmentioning

confidence: 99%

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

2012

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.

“…striata populations is higher than in m any other species of terrestrial mollusks. F or example, in the mesophilic m ollusk Bradybaena fruticum, Fst was 0.135 [9] in the entire Southern M id-Russian U pland, while Therefore, H. striata is characterized by one of the lowest degrees of the gene flow among the mollusks inhabiting the Southern M id-Russian Upland. We believe that this is due to the special features of the biology o f the species.…”

Section: Results a N D Discussionmentioning

confidence: 96%

Microspatial Structure of Population Gene Pool in the Land Snail Helicopsis striata (Pulmonata, Hygromiidae) in the Conditions of the Southern Mid-Russian Upland

Sychev

2018

Microspatial differentiation of the population gene pools of the terrestrial mollusk Helicopsis striata (Muller, 1774) is revealed for various conditions of the Southern Mid-Russian Upland, which is caused by the fragmentation of habitats and differences in the intensity of the gene flow between demes. The spatial differ entiation of H. striata, due to the special features of its biology, is the highest among other terrestrial mollusks of the studied region. Populations with a low variability and weak gene pool differentiation are demonstrated to be the most vulnerable. The methodological importance of the intrapopulation structure of the species is specifically noted for the works on estimating the state of the population's gene pools, since the single datasets of individual demes cannot demonstrate the true nature of the genetic structure of the populations.