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- Title
Sediment pigments and silting rate as indicators of the trophic condition of the Rybinsk Reservoir.
- Authors
Sigareva, L.; Zakonnov, V.; Timofeeva, N.; Kas'yanova, V.
- Abstract
The results of studies of the vertical distribution of SP (the sum of chlorophill a and pheopigments) and the rate of silting of the Rybinsk Reservoir since its filling in 1941 up to 2009 are studied. The range of pigment concentrations (7-232 μg/g of dry residue) in core sample layers includes the values typical of all types of trophic conditions of water bodies, but the majority of values (81%) refers to the categories of mesotrophic and eutrophic. The mean concentrations of pigments in core samples over the periods between soil surveys, which were carried out in 1955, 1978, 1992, and 2009, averaged 525.4, 248.8, 200.6, and 142.3 mg/(m year), respectively. The mean rates of silting at the stations under study decreased from survey to survey from 13.6-17.9 to 3.5-5.3 mm/year. A direct positive relation was found to exist between the mean annual concentrations of pigments in core samples and the rate of silting at higher values of the indices in lakelike reaches in comparison with river-type reaches.
- Subjects
RUSSIA; SEDIMENT analysis; BIOLOGICAL pigments; EUTROPHICATION; SOIL surveys; SILT; RYBINSK Reservoir (Russia)
- Publication
Water Resources, 2013, Vol 40, Issue 1, p54
- ISSN
0097-8078
- Publication type
Article
- DOI
10.1134/S0097807813010090