populations

State of populations of anuran amphibians (Anura, Amphibia) in the north of the Caspian lowland

Authors: Tabachishin V. V., Tabachishin V. G., Yermokhin M. V.

The distribution of three species of anuran amphibians (Pelobates vespertinus, Bombina bombina and Pelophylax ridibundus) in the north of the Caspian lowland within the south-east of the Saratov region is considered. The biotopic habitat of local populations of these species is revealed and trends in their abundance under the influence of climatic and anthropogenic factors are discussed. Reduction of their numbers is shown and the continuation of this trend is predicted if the direction of climate change in the region remains unchanged.

New data on the distribution of Pallas's spadefoot toad (Pelobates vespertinus (Pallas, 1771)) and fire-bellied toad (Bombina bombina L., 1761) (Anura, Amphibia) on the territory of the Saratov region and adjacent territories

Authors: Tabachishin V. G., Yermokhin M. V.

New data on the geographical distribution of Pelobates vespertinus and Bombina bombina in the Saratov region and adjacent districts of the Volgograd, Voronezh, Penza and Ulyanovsk regions are presented. The habitation of B. bombina and P. vespertinus populations in 25 and 22 localities, respectively, was established. Most modern populations of these species of anuran amphibians have been recorded near water bodies in river valleys.

LONG-TERM DYNAMICS OF THE SIZE-WEIGHT AND SEXUAL STRUCTURE IN POPULATIONS OF PELOBATES FUSCUS (ANURA, PELOBATIDAE) IN THE MEDVEDITSA RIVER VALLEY (SARATOV REGION)

Authors: Yermokhin M. V., Tabachishin V. G., Ivanov G. A.

The size, weight and sexual structure of several populations of mature individuals of the common spadefoot was analyzed in five lakes of the Medveditsa floodplain (Saratov Region, Lysogorsky District) in 2009 - 2016. The body length of the males participating in reproduction ranged from 29.0 to 56.0 mm (the weight from 2.35 to 20.87 g), and that of females ranged from 29.3 to 59.2 mm (the weight from 2.64 to 22.33 g). In most P.