Long-term dynamics analysis of small mammals in the Republic of Mordovia is given in this paper. Ecological studies on the small mammals at Republic of Mordovia were made during the years 2006-2019.There are altogether 17 species. Among the 23,780 captures. A 3-4-year cycle in population fluctuations was revealed for the conditions of this region. It is shown that in unfavorable years under the conditions of temperature and humidity (2010 and 2012), small mammals recovered their population numbers by the end of the growing season due to the existing areas of settlement and concentration centers. The sex ratio of most species over the research average period is almost always biased in the direction of males.
ANDREYCHEV, A. (2021). Population structure and dynamics of small rodents and insectivorous mammals in a region of the Middle Volga, Russia. Biharean Biologist, 15(1), 33-38.

It was demonstrated that odor of commensal house mice supressed reproduction of female Microtus rossiaemeridionalis
2009, Vol. 426, pp. 1–3. © Pleiades Publishing, Ltd., 2009. Original Russian Text © E.V. Kotenkova, L.V. Osadchuk, 2009, published in Doklady Akademii Nauk, 2009, Vol. 426, No. 2, pp. 283–285

The reproductive cycle of Lygodactylus verticillatus, a small diurnal lizard of the family Gekkonidae, was studied using a large preserved sample from Lake Ihotry in a very arid and seasonal environment in Madagascar. Ovigerous females and small juveniles were found in all seasons. In males, no significant seasonal differences in testis size were found. However, the percentage of ovigerous females was distinctly lower in the dry, cool season (April–October). This indicates reproductive activity in L. verticillatus during the whole year, with a rather weakly marked seasonality that results in lower incidence of reproduction during the dry season. Most females dissected had two eggs or follicles of similar size in their oviducts, and only in 5% of the specimens did one oviduct contain a mature egg or a follicle of distinctly larger size than the other oviduct. A clutch size of two eggs therefore seems to prevail in this species, despite its small size (the range of adult female snout-vent lengths was 20–27 mm). According to the available literature data, continuous or weakly seasonal reproduction seems to be more common in geckos than in other lizards, which might be related to the constraint of their low clutch size (1–2 eggs).