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Title: CLADOCERA REMAINS IN SHORT CORES FROM TWO SMALL NORTHERN LAKES (BOLSHEZEMELSKAYA TUNDRA, RUSSIA)
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CLADOCERA REMAINS IN SHORT CORES FROM TWO SMALL NORTHERN LAKES (BOLSHEZEMELSKAYA TUNDRA, RUSSIA)
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1314-2704
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English
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18
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4.2
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Territories of Bolshezemelskaya tundra are characterized by permafrost and large number of lakes in the region. Harbey lakes are the largest lakes system in the South-East of Bolshezemelskaya tundra. The system is a chain of series-connected water bodies (Golovka, Bolshoy Harbey and Maliy Harbey), which are connected by ducts with shallow lakes (Kilometrovoye, Kotovo, Leningradskoye). Short columns of bottom deposits of Kotovo and Kilometrovoye lakes with the lengths of 27 and 16 cm, respectively, were analyzed for the qualitative content of Cladocera.
In the subfossil composition of lakes 20 taxa of Cladocera were registered: 17 taxa in Kotovo lake and 15 taxa in Kilometrovoye lake belonging to 4 families (Chydoridae, Eurycercidae, Daphniidae, Bosminidae) and 10 genera. Subdominants of Kotovo lake are represented by Chydorus cf. sphaericus, Alona affinis and Bosmina (Eubosmina) sp. Chydorus cf. sphaericus is the dominant in Kilometrovoye lake throughout the entire period of the study, while in Kotovo lake this taxon becomes the dominant only at the depth of 9 cm by replacing Alona affinis. The increase of the planktonic species proportion in the upper 0-3 cm of the sediments with decreasing of the relative abundance of the littoral zone inhabitants is noted. The proportion of littoral species in the composition of Cladocera remains of the Kotovo and Kilometrovoye lakes is quite high, due to small size and depths of the water object. Increase of the proportion of Chydorus cf. sphaericus at the present stage of the lake evolution indicates the beginning of the water pollution and eutrophication. The increase of the planktonic species proportion can be the consequence of the permafrost melting. |
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conference
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18th International Multidisciplinary Scientific GeoConference SGEM 2018
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18th International Multidisciplinary Scientific GeoConference SGEM 2018, 02-08 July, 2018
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
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373-380
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02-08 July, 2018
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website
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cdrom
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1248
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Cladocera remains; paleoreconstructions; Bolshezemelskaya tundra; Harbey lakes
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