Earth’s Cryosphere, 2017, Vol. XXI, No. 5, p. 60-68

ALGAE AND INVERTEBRATES IN FRESHWATER ICE (ZABAIKALSKY KRAI)

E.Yu. Afonina1, N.A. Tashlikova1, G.Ts. Tsybekmitova1, V.A. Obyazov2

1Institute of Natural Resources, Ecology and Cryology, SB RAS,
16a, Nedorezova str., Zabaikalsky krai, Chita, 672014, Russia; kataf@mail.ru
2Scientific Production Association “Gidrotehproect”, 97A, 14th line, V.O., St. Petersburg, 199178, Russia; obviaf@mail.ru

The species composition of algae and invertebrates inhabiting the ice of Lake Arakhley are described in this paper. Diatoms and dinoflagellates, rotifers and crustaceans determine the taxonomic composition of the lake ice. The greatest diversity of the algae has been found in the ice cover above the deep part of the lake, whereas that of invertebrates was found above its littoral part. It has been found that the large number of species and the largest amount of biomass of organisms are observed during the period of maximum ice cover growth. Vertical zonation is characterized by distribution of aquatic organisms in the upper and middle ice horizons. The lake ice has been shown to have high hydrolytic enzyme activity, and the highest amount of biogenic elements has been noted to occur during formation and destruction of the ice cover.

Algae, invertebrates, hydrolytic enzyme activity, nutrients, ice, Lake Arakhley

DOI: 10.21782/EC1560-7496-2017-5(60-68)