ISSN (print) 0868-8540, (online) 2413-5984
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Algologia 2011, 21(2): 190–201
Ecology, Cenology, Conservation of Algae and Their Role in Nature

Interannual dynamic of sedimentary chlorophyll a content in the Rybinsk reservoir (Russia)

Sigareva L.Ye., Timofeeva N.A.
Abstract

The maintenance of vegetative pigments in the top layers of polytypic bottom sediments during the years 1993–2009 in Rybinsk reservoir is studied and comparison with indicators of productivity of phytoplankton is determined. The reduction of a sedimentary chlorophyll (chlorophyll a plus pheopigments) content on river-bed stations is determined. Average concentration for period at stations varied in a range of values (3–284 mkg/g dry weight sediment in a layer of 0–2,5 cm and 1,8–260,7 – in a layer of 0–5 cm), characteristic of different trophic type. The maximum values of the mean annual concentration (176,4 mkg/g dry weight sediment) was observed in ecoton sediment, and minimum (30,4) – in lake parts with mosaic ground. Results of investigation testify to reduction of eutrophication reservoir rate.

Keywords: chlorophyll a, bottom sediment, interannual dynamic, Rybinsk Reservoir

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