Expansion of the Taxonomic Composition of Diatoms (Bacillariophyta) in Tundra Water Bodies of Adjacent Territories of the Lena Delta Wildlife Reserve (Yakutia, Russia) Using Electron Microscopy

Abstract—Using the electron microscopy, 435 diatom algae from 78 genera of 14 different types of tundra water bodies located in the vicinity of the Lena Delta Wildlife Reserve, north of the Arctic Circle, on the north-facing slope of the Primorsky Ridge (the eastern spur of the Kharaulakh Range of the Verkhoyansk mountain system) were revealed. Among them, 24 taxa of the species rank and 1 taxon of the generic rank are new to the flora of Russia. Most of these species are characteristic of oligotrophic water bodies and watercourses in Europe. Sixty-six of the identified species belonging to 28 genera have been identified to the genus level; most of them belong to the genera Planothidium (7) and Gomphonema (10).