Статьи

The results of our comparative analysis of parameters of the leukocyte blood system of underyearlings and mature specimens of the common viper Vipera berus are presented. The material was the blood of 36 females and 26 males caught in the Middle Volga basin, and 13 underyearlings born in captivity from 4 females of this sample. V. b.

This paper reports the results of our monitoring the presence of advertisements for the sale of sea turtle (Cheloniidae) derivatives on the Internet in Russia in 2021 and 2023. Data on species, number, region of origin, market price and turnover rate of these derivatives are summarized. A brief analysis of the regulatory framework governing the turnover of sea turtle derivatives is given and the conclusion on the necessity of its adjustment is provided.

The paper presents the results of using multiplicative indices for species identification of polyploid green toads of Central Asia. Live adult individuals of Bufotes baturae (24 females and 17 males) from the territory of Tajikistan and B. pewzowi (14 females and 24 males) from Kazakhstan, Uzbekistan and Tajikistan were studied. The animals were caught in nature, measured and immediately released. The species belonging of the studied green toads was established by cytogenetic methods.

This research paper examines the influence of internal factors (female body weight, body condition) and external ecological factors on the reproductive parameters of females, as well as on the reproductive ecology of adult individuals of anuran amphibians. Among the most significant reproductive characteristics of females are the number of eggs in a clutch, the proportion of reproductive products to female body weight (contribution to reproduction), and the average weight of eggs.

 A comparative estimation of the leukocyte profile of the marsh turtle Emys orbicularis (Linnaeus, 1758) living in the Ural river basin (Orenburg region, Belyaevsky district, 11 females and 5 males) and in the Volga river basin (Astrakhan region, Krasnoyarsk district, 28 females and 20 males) was made.

Based on the results of our 2017–2021 field research, the coordinates of 17 meeting points of the sunwatcher toadhead agama (Phrynocephalus helioscopus) (Pallas, 1771) in the West Kazakhstan and Atyrau regions of the Republic of Kazakhstan are given, from 49°17.256'N, 48°14.048'E in the North to 46°34.330'N, 55°49.319'E in the South.

New data on the boundaries of the distribution range of the Lindholm rock lizard (Darevskia lindholmi), an endemic of the Crimean Peninsula, are presented. This petrophilous lizard inhabit a wide range of biotopes in various landscape levels of the Mountainous Crimea. The upper boundary of D. lindholmi distribution in the southwest of the Main Range of the Crimean Mountains reaches an elevation of 1,520 m a.s.l.

The distribution and morphometric features of the common toad (Bufo bufo) in the North-East of European Russia are discussed. The northern boundary of the species' range in the region has a complex configuration. In the west and central part of the region, the toad is found up to latitude 65º42'N and 63º01'N, respectively, the eastern border of its habitat moves northwards up to 64º13' and then drops to the south along the Ural Mountain Ridge.

Population density of reptiles in four desert areas of southwestern Tajikistan was estimated in spring 2018–2019. The structure of reptile communities in seven typical landscapes was described. The highest species diversity and population density were observed in sandy landscapes. Seven species of psammobionts formed the basis of these reptile communities.

We studied sexual dimorphism in the black forest-steppe viper, Pelias berus nikolskii (Vedmederja, Grubant et Rudaeva, 1986), inhabiting the Voronezh region. From 2008 to 2017, 118 snakes were captured, of which 84 were males and 34 were females. Body length, tail length, and five head measurements were taken from the individuals was calculated. Analysis of Covariance showed that males and females differed in all traits except the greatest width of the head and head length.