The inhabitants of the spring ice, under-ice water, and sediments of the white sea in the estuarine zone of the Severnaya Dvina River

The data on the supra-ice snow, ice, under-ice water, and benthic algal flora obtained in 2007–2008 by sampling in the estuary of the Severnaya Dvina River are analyzed. The river ice and under-ice water in the estuarine zone and in the channel part of the Severnaya Dvina differed greatly in the alg...

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Bibliographic Details
Published in:Oceanology (Washington. 1965) 2011-04, Vol.51 (2), p.295-305
Main Authors: Sazhin, A. F., Sapozhnikov, F. V., Rat’kova, T. N., Romanova, N. D., Shevchenko, V. P., Filippov, A. S.
Format: Article
Language:English
Subjects:
Algae
Biomass
Earth and Environmental Science
Earth Sciences
Estuaries
Flora
Ice
Marine Biology
Oceanography
River ice
Rivers
Sediments
Snow
Species diversity
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Summary:The data on the supra-ice snow, ice, under-ice water, and benthic algal flora obtained in 2007–2008 by sampling in the estuary of the Severnaya Dvina River are analyzed. The river ice and under-ice water in the estuarine zone and in the channel part of the Severnaya Dvina differed greatly in the algal flora’s composition. The fresh water species never exceeded 8.6%, while the ice algae composed 90–96% of the total ice inhabitants’ biomass. In the under-ice water, this value did not exceed 58–64%. The bacteria in the ice composed not more than 2.5–10% of the total biomass, while, in the under-ice water, 36–49%. The shares of ciliates (0.04%) and nematodes (0.005–1.6%) in the total biomass were negligible. In the estuarine zone, the ice was inhabited mainly by nematodes (78% of the total biomass), while, in the river, their share decreased to 9%. The contribution of bacteria was 15% in Dvina Bay and increased to 61% in the river. The importance of algae in the snow was minor: 7% of the total biomass in the marine zone and 30% in the river region. High species diversity of the algal flora in the sandy and sandy-silty littoral grounds was revealed. The values of the total biomass of the bottom algal flora (0.38 g C/m 2 ) were only two to three times lower than the values revealed in similar habitats in the summer. The epipelithic forms (0.15 g C/m 2 ) dominated, being represented by 46 species of algae (49%). The shares of epipsammonic (0.12 g C/m 2 ) and planktonic (0.11 g C/m 2 ) species were almost equal to each other: 25 and 22 species, respectively (27 and 24%).
ISSN:0001-4370
1531-8508
DOI:10.1134/S0001437011020159