тестостерон

Seasonal dynamics of sex hormone levels in Elaphe dione (Pallas 1773) (Colubridae, Reptilia) in the northern part of the range

Authors: Klenina A. A., Kuznetsova E. V.

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.

Male Reproductive Cycle in a Population of the Common Lizard Zootoca vivipara (Squamata, Lacertidae) from Southeast of Western Siberia

Authors: Yartsev V. V., Kuranova V. N., Absalyamova E. N.

Widely distributed reptile species are characterized by reproductive plasticity, which may also appear as variations of the reproductive cycles. To understand the specificity of the male reproductive cycle of Zootoca vivipara in the Asian part of its range, males from the Tomsk population (the southeast of the Western Siberia) caught from April till July 2017 were studied (n = 27).