Статьи

Among many abiotic environmental factors affecting amphibian larval development, temperature regime is one of the most important. Larvae of the genera Bufo, Bufotes and Epidalea were used in our experiments. Five temperature regimes (20, 23, 26, 29, and 32°C) were used in rearing juveniles. With increasing water temperature, the duration of larval development decreased statistically significantly in all species studied (r = -0.89 – -0.36; p < 0.05).

In the Rana temporaria population introduced into the south of Kamchatka, high variation in the rate of larval growth and development was revealed, due to differences between spawning pools, some of which being fed by thermal groundwater. As a consequence, the variability in the timing of metamorphosis was also high and comparable to that detected in populations of the native part of the range with a longer period of activity. In the tadpoles of R.

The results of using logarithmically transformed body proportionality indices for non-invasive vital identification of two cryptic forms of Japanese tree frogs are presented. Adult animals of Dryophytes japonicus (12 females and 54 males) and D. cf. japonicus (6 females and 58 males)) from the Russian Far East were studied.

We investigated seasonal changes in the plasma levels of sex hormones in males (testosterone) and females (progesterone and estradiol) of Elaphe dione (Pallas 1773). Snakes (21 males and 17 females) were captured from May to August 2022 on the Samarskaya Luka (Samara Region, Russian Federation). Some individuals (4 males and 11 females) after capture were kept under controlled laboratory conditions for two months, then they were released at the capture sites. Blood was sampled immediately after capture.

The spawning migrations of four widespread species of anuran amphibians in European fauna (Pelobates vespertinus, Bombina bombina, Pelophylax ridibundus, and Rana dalmatina) were analyzed. In the years with an abnormally early start of the spawning migrations of the anuran amphibians and their passage through a false spring, powerful anticyclones over Central Asia, Trans-Urals or Western Siberia blocked the west–east atmospheric transfer.

The present paper studies Zootoca vivipara populations from the low, medium and alpine zones of the Kuznetsky Alatau. By using skeletonchronology, the age of animals was determined, and the life longev-ity, sex -age structure, growth rate of bone and body were estimated. Males and females had the highest growth rates of bone and body until their second wintering, and then they decreased. Slow-growing specimens reach older ages.