Нижнее Поволжье

The article provides a brief analysis on the species composition of microlepidopteran genus Neofriseria Sattler, 1960 (Gelechiidae) of the fauna of Russia and some neighboring countries. A list of six species of this genus known for the territory of Russia at present is given. One species of the genus, previously described only relating to males from Greece, is recorded for Russia (Saratov region) firstly as a new subspecies with a description and illustrations of the genital structures of both sexes.

Specific  distributions  features  of distribution of 9 species  of martens in the north of the Lower Volga region have been demostratet. Calcu­ lated width of the spatial niches for these predators and their degree of overlap. Widespread spacies  of martens  in this  region are the weasel, stoat and badger. Black  polecat, pine and stone martens occupy  about half of the possible biotopes, but mink  and steppe polecat are found only in a limited number of habitats.

The article presents a phytocoenotic description of 23 plant communities with Colchicum bulbocodium subsp. versicolor studied during the period of mass fl owering in 2014–2018. It was found that, across the Lower Volga region, the studied communities with C. bulbocodium subsp. versicolor are mostly confi ned to the slopes of south- and east-facing arroyos and more seldom to the southern and northern hill slopes, plains, arroyo and liman bases, and fl oodmeadows. During the period of mass fl owering, 207 vascular plants were detected in the studied communities.

Проанализирована структура распределения коротконадкрылых жуков (Coleoptera, Staphylinidae) в основных ландшафтных комплексах Нижнего Поволжья. Дана оценка разнообразия основных экологических группировок семейства в пределах региона. Выделены исторически сложившиеся экологические комплексы и рассмотрены возможные пути их формирования.

The estimation size of individual plots the American mink on the res- ervoirs in Saratov region in the period from 2000 to 2014. The average plot size of males – 30.6 hectares, females – 27.8 hectares. During the cold period on most waters plot sizes are increased almost two- fold. Found that females go farther from the center of the rivers and streams than males (females – 203.8 m; males – 166.7 m). American mink is more inclined to the rivers with wide floodplain (?2 = 26.2; p = 0.01).

The result of study of distribution of rove beetles (Coleoptera, Staphylinidae) in the main types of biotopes of the Lower Volga region during many years in the paper is given. Correlation between ecological features of the region, biotopical distribution and species composition of rove beetles is considered.

Key to the subfamilies of chironomids (Chironominae) based on the morphology of the male genitalia includes 16 genus and 45 species found in the Volga river floodplain lakes (Saratov region). For the six species of the four genera of the tribe Chironomini (Einfeldia sp.1, Chironomus sp. (Lobochironomus), Dicrotendipes sp.1, Dicrotendipes sp.2, Parachironomus sp., Polypedilum sp.) described morphological differences from the known and the most directly comparable species.