fertility

Reproductive characteristics of Darevskia daghestanica (Reptilia, Lacertidae) in Intra-Mountain Dagestan

Authors: Kidov A. A., Erashkin V. O., Ivanov A. A., Mazanaeva L. F., Askenderov A. D., Kondratova T. E.

The paper presents the results of studying the reproductive biology of Darevskia daghestanica in the valleys of Khzanor and Kitlyarta rivers (Tsunta district, Republic of Dagestan, Republic of Dagestan). Adult females were caught in the II–III decades of May 2021. In the following, the animals were kept singly in a laboratory. Lizards laid eggs from the third decade of May to the second decade of June. The body length of breeding females was 43.95–56.20 mm.

Captive breeding of Regel’s racerunner (Eremias regeli, Reptilia, Lacertidae)

Authors: Kidov A. A., Erashkin V. O., Ivanov A. A., Kondratova T. E.

The paper presents the results of laboratory reproduction of Regel’s racerunner (Eremias regeli). Offspring was obtained from natural individuals (2 females and 2 males) captured in the vicinity of the Bokhtar town (Khatlon region, Republic of Tajikistan). Captive-born animals (3 females and 2 males) began laying eggs at the age of 7 months. The lizards from nature reproduced twice a year, while the animals obtained in the laboratory lay eggs up to three times per season. The clutches of both natural and laboratory lizards contained from 2 to 4 eggs.

Captive breeding of the Caspian lizard (Darevskia caspica) (Reptilia, Lacertidae)

Authors: Kidov A. A., Ivanov A. A., Erashkin V. O., Kondratova T. E.

The Caspian lizard (Darevskia caspica) is a recently described endemic of the Hyrcanian forests of Northern Iran. The paper presents new data on the reproductive biology of D. caspica obtained in laboratory conditions. Breeding females have a body length of 53.4– 64.4 mm and a mass of 2.96–3.60 g. Females produce from one to three clutches per season, each of which contains 1–6 eggs. The length of these eggs is 10.35–13.95 mm, width 6.19–7.59 mm, and weight 0.27–0.45 g.

On Eggs Re-Laying of Greenbelly Lizards from the Darevskia (Chlorogaster) Complex (Reptilia, Lacertidae)

Authors: Kidov A. A., Ivanov A. A., Kondratova T. E., Stolyarova E. A., Nemyko E. A.

The paper discusses cases of eggs re-laying in two lizard species from the Darevskia (chlorogaster) complex. A male and a female of D. Chlorogaster were captured on 22 March, 2016 in the Gilan province (Iran), and she subsequently laid eggs on 29 May (4 eggs) and 5 July (4 ones). The eggs had length of 10.4–12.8 mm, the width of 6.1–6.5 mm, and the weight of 0.240–0.340 g. Young lizards came out from seven eggs after 52–55 days of incubation. The body length of these newborn lizards was 22.9–27.8 mm, the tail length was 38.5–46.5 mm, and the weight was 0.330–0.460 g.

DISTRIBUTION AND REPRODUCTION ECOLOGY OF THE SIBERIAN SALAMANDER (SALAMANDRELLA KEYSERLINGII) IN THE NORTHEAST OF EUROPEAN RUSSIA

Authors: Bobretsov A. V., Kochanov S. K.

Data on the findings of the Siberian salamander over the territory of the European Russian Northeast are summarized. This species is shown to be rare here and to be distributed locally. Three types of spawning reservoirs have been identified, namely: lowland marshes, puddles along the edges of transitional marshes, and roadside ditches. Reproduction begins immediately after snow melting and the appearance of open water. Significant correlation links between the dates of the egg lying onset, average air temperature in April and the dates of snow melting in burs are noted.