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The relict northern European arctic-boreal species Mysis relicta Lovén, 1862 has been recorded in the Volga River basin after 90 years; it had previously been found once in the gut of a European perch. Ten specimens were registered at depths of 26.5 and 32.9 m in July 2021 in the small Lake Svyatozero, located in Vashkinsky District, Vologda oblast (60°26′ N, 37°49′ E). The data on the species habitat in Lake Svyatozero and the possibility of finding this species in other small lakes in the southeastern part of the range have been analyzed. It is recommended to include M. relicta in the new edition of the Red Data Book of Vologda Oblast with 1/CR/I protection status. [ABSTRACT FROM AUTHOR]

The taxonomic structure, typology, species richness, and total abundance of bentic and littoral macroinvertebrate communities from small lakes of the Arctic and Subarctic zones are considered on the basis of original data from three northern Palearctic regions (the foot of the Putorana Plateau, Kolguev Island, and Western Svalbard Island). A comparative analysis of the communities of these regions has been carried out. The features of High Arctic insular, Low Arctic, subarctic, and boreal lake communities are discussed using a large volume of literature data. The complex pattern of changes in the total benthos biomass of small lakes has been revealed: it decreases in the subarctic taiga, increases in the hypoarctic tundra, and decreases again in the High Arctic. [ABSTRACT FROM AUTHOR]