Bombina bombina

MORPHOMETRIC CHARACTERISTICS OF BOMBINA BOMBINA (DISCOGLOSSIDAE, ANURA) IN THE MEDVEDITSA RIVER VALLEY (SARATOV REGION) AND NONINVASIVE SEX DIAGNOSTICS BY SIZE AND WEIGHT TRAITS

Morphometric characteristics of Bombina bombina males and females were done. 10 traits were measured and 10 indices were calculated for a sample of B. bombina from the population of the lake Cherepashie (the Medveditsa river valley, Lysogorsky district, Saratov region). Only some traits show significant sex-ual differences in B. bombina. It is shown that in the conditions of degradation of the spawning reservoir network in river valleys, a significant increase in the role of individuals with relatively large dimensions of their hind limbs (mainly femur) occurred in the B.

STRUCTURAL DYNAMICS OF THE SPAWNING ANURAN TAXOCENOSES IN FLOODPLAIN LAKES OF THE MEDVEDITSA RIVER VALLEY (SARATOV REGION)

The structure of the spawning anuran taxocenoses in five floodplain lakes in the Medveditsa river valley in 2009 - 2016 was analyzed. Degradation of the populations of the three most numerous species and a decreased degree of dominance of the spadefoot toad were established. This degradation strongly affects the species with a longer distance of spawning migrations - the severity of the changes sequentially decreases in the row: Pelophylax ridibundus → Pelobates fuscus → Bombina bombina. The structural parameters in the lakes of Lebyazhye and Koblovo were stable.

SIZE-WEIGHT AND SEXUAL STRUCTURE OF PELOPHILAX RIDIBUNDUS AND BOMBINA BOMBINA (AMPHIBIA, ANURA) POPULATIONS IN THE FLOODPLANE OF THE MEDVEDITSA RIVER (SARATOV REGION)

The size, weight and sexual structure of Pelophylax ridibundus and Bombina bombina populations was analyzed during their spawning migrations in 2013 - 2015 in four lakes of the Medveditsa River flood-plane (Saratov Region, Lysogorsky District). The body length of Pelophylax ridibundus males ranged from 29.3 to 101.3 mm (the weight from 2.10 to 152.2 g), and that of females did from 36.1 to 120.2 mm (the weight from 4.45 to 181.0 g); for Bombina bombina males - from 25.4 to 50.6 mm (the weight from 1.06 to 8.5 g), and that of females from 32.1 to 49.7 mm (the weight from 2.64 to 8.43 g).

ON THE NUTRITION OF SOME SEMI-AQUATIC AMPHIBIAN SPECIES (AMPHIBIA: ANURA) IN THE NORTHWESTERN UPPER OKA REGION

The nutrition of Bombina bombina and Pelophylax lessonae collected in three habitats of the northwestern Upper Oka region in 2006 - 2014 was studied. The feed composition of Pelophylax lessonae reduced to the autumn by the abundance and taxonomic diversity, epigeious beetles and ants to predominate. Bombina bombina mainly feeds on ants and arachnids in the autumn.

REPRODUCTIVE PARAMETERS OF BOMBINA BOMBINA AND PELOPHYLAX RIDIBUNDUS (AMPHIBIA, ANURA) FEMALES AS FUNCTIONS OF THEIR SIZE AND WEIGHT CHARACTERISTICS

Based on field surveys in 2013 – 2015 of four local populations of Bombina bombina and Pelophylax ridibundus in spawning lakes in the Medveditsa river valley (Saratov region) it was found that the body length (SVL) and weight of mature females of B. bombina and P. ridibundus ranged from 31.1 to 49.7 mm and from 63.1 to 138.1 mm; from 2.64 to 8.43 g and from 25.4 to 181.0 g, respectively.