UDC

594.38

Authors

Lyubas Artem Aleksandrovich, Postgraduate Student, Institute of Ecological Problems of the North, Ural Branch of the Russian Academy of Sciences (Arkhangelsk, Russia) 

Abstract

Pymvashor hydrothermal system in the east of the Bolshezemelskaya Tundra is the only one in the mainland European Subarctic. In addition to modern hydrotherms, there are thermogene travertine deposits of an ancient spring. In the travertines and buried alluvium of this spring there can be found shells of gastropods (species of Lymnaeidae and Planorbidae fam.), most of them living in the modern springs as well. The taphocoenoses differ from the modern groups of molluscs in terms of increased proportion of Anisus laevis. From the ancient spring to the modern hydrotherms the size of Lymnaea ovata and L. lagotis individuals declined by 30–40%.

Keywords

gastropods, hydrothermal ecosystems, thermal springs, Subarctic, Bolshezemelskaya Tundra, travertines, alluvium.

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