Magneto-Mineralogical and Biological Properties of Sediments of the Lake Bolshoy Kharbey

Investigation of sediment cores from the lake Bolshoy Kharbey (Bolshezemelskaya tundra) was performed using magnetic-mineralogical and palaeobiological methods, including palynological, Cladocera and chironomid analysis. It was shown that noticeable changes took place in the state of sediments and c...

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Published in:Žurnal Sibirskogo federalʹnogo universiteta. Seriâ Biologiâ (Online) 2014-12, Vol.7 (4), p.372-372
Main Authors: Nazarova, Larisa B, Frolova, Larisa A, Kosareva, Lina R, Rudaya, Natalia A, Syrykh, Ludmila S, Gafiatullina, Lilia I, Kuzina, Dilyara M, Palagushkina, Olga V, Tumanov, Oleg N, Fefilova, Elena B, Loskutova, Olga A
Format: Article
Language:eng ; rus
Subjects:
Alona
Bolshezemelskaya tundra
chironomids
Chydorus
Cladocera
Eubosmina
Larix
magnito-mineralogical analysis
palaeoclimate
Pinus
pollen
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Summary:Investigation of sediment cores from the lake Bolshoy Kharbey (Bolshezemelskaya tundra) was performed using magnetic-mineralogical and palaeobiological methods, including palynological, Cladocera and chironomid analysis. It was shown that noticeable changes took place in the state of sediments and communities of hydrobionts. Lower part of the sediments is characterized by lower ferromagnetic component, which is related to lower number of magnetotactic bacteria, producing biologically controlled magnetic minerals. The most frequent zooplanktonic taxa in the whole core were Chydorus. cf. sphaericus, Eubosmina cf. longispina, small forms of the genera Alona. Chironomid communities are represented mainly by acid-tolerant, temperate, littoral-sublittoral taxa. In the upper layers of sediments in cladoceran and chironomid communities share of planktonic taxa increases which indicates rise of the lake level as a result of seasonal ground melting. At the same time gradual succession in the local vegetation starts. Concentrations of the birch and larch pollen decrease, and Pinus s/g Diploxylon increase.
ISSN:1997-1389
2313-5530