Subfossil records of Cladocera from the tundra Lake Yambeto in the Yamal Peninsula

Аннотация

We performed a paleoecological study of a 124-cm-long sediment core from Lake Yambeto (southern part of the Yamal Peninsula, Yamalo-Nenets Autonomous Okrug, Russia), which consists of a series of lake basins varying in depth (up to 6.9 m) and merged with each other. The species composition of subfossil cladocerans was analyzed: a total of 26 taxa from 5 families were identified; of them, 73% belonged the family Chydoridae, thus ranking it as the most diverse. The cladoceran assemblage was dominated by Holarctic and Palearctic species, with Bosmina (Eubosmina) longispina, Bosmina longirostris, and Chydorus cf. sphaericus as the most abundant. The mean saprobity index (1.52) characterized the lake as β-mesosaprobic.