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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kosolapov D.B., Rogozin D.Y., Gladchenko I.A., Kopylov A.I., Zakharova E.E.
Заглавие : Microbial sulfate reduction in a brackish meromictic steppe lake
Колич.характеристики :12 с
Место публикации : Aquat. Ecol.: KLUWER ACADEMIC PUBL, 2003. - Vol. 37, Is. 3. - P215-226. - ISSN 1386-2588, DOI 10.1023/A:1025871300917
Примечания : Cited References: 43
Предметные рубрики: REDUCING BACTERIA
SULFUR-COMPOUNDS
LITTORAL SEDIMENT
INORGANIC SULFUR
EUTROPHIC LAKE
SALT-LAKE
RATES
MARINE
CYCLE
TEMPERATURE
Ключевые слова (''Своб.индексиров.''): anoxic waters--brackish meromictic lake--littoral and profundal sediments--sulfate reduction
Аннотация: Patterns of sulfate reduction were studied in water and sediments of Lake Shira, South Siberia, Russia. The lake was characterized by a high level of sulfate (91-116 mM). The concentration of hydrogen sulfide in the anoxic waters of the lake reached 0.6 mM. In summer the sulfate reduction rate in the water column, measured by radiometric technique, varied from 0.25 to 9.81 mumol sulfate l(-1) d(-1). There were two peaks of sulfate reduction activity: just below the chemocline and near the sediment surface. Sulfate reduction rate in the profundal silts ranged from 4.1 to 90.6 mumol l(-1) d(-1). The zone of the most active sulfate reduction was restricted to the surface sediment layers. The acceleration of sulfate reduction rate (up to 236 mumol l(-1) d(-1)) and the increase of density of viable sulfate reducers (up to 2x10(5) cells ml(-1)) were recorded in the littoral sediments adjacent to the mouth of the Son River and sewage discharge. It was apparently caused by the input of allochthonous organic substrates and also by a high environmental temperature. On an areal basis, sulfate reduction rate in the water was approximately 8 times higher than that in the profundal sediments. Sulfate reduction was the most important process of anaerobic oxidation of organic carbon in Lake Shira. In summer in the profundal zone of the lake, sulfate reducers were able to mineralize about 67% of the daily integrated primary production of phototrophic and chemotrophic organisms.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kalachova G.S., Kolmakova A.A., Gladyshev M.I., Kravchuk E.S., Ivanova E.A.
Заглавие : Seasonal dynamics of amino acids in two small Siberian reservoirs dominated by prokaryotic and eukaryotic phytoplankton
Колич.характеристики :13 с
Место публикации : Aquat. Ecol.: KLUWER ACADEMIC PUBL, 2004. - Vol. 38, Is. 1. - P3-15. - ISSN 1386-2588, DOI 10.1023/B:AECO.0000021044.55658.71
Примечания : Cited References: 37
Предметные рубрики: DISSOLVED ORGANIC-MATTER
PARTICULATE FATTY-ACIDS
FRESH-WATER ECOSYSTEMS
BACTERIAL PRODUCTION
CHEMICAL-COMPOSITION
RATES
MICROALGAE
PROTEINS
RELEASE
DAPHNIA
Ключевые слова (''Своб.индексиров.''): amino acids--phytoplankton--cyanobacteria--blooms
Аннотация: The comparison of the dynamics of phytoplankton biomass and total amino acid composition was made for two water bodies: in one the phytoplankton were dominated by prokaryotes (i.e., there was a bloom of cyanobacteria) and by eukaryotic microalgae in the other. The dynamics of phytoplankton biomass and of total amino acid composition of water were investigated during the vegetation season. It was found that the only factor that significantly changed the percentages of amino acids in water was the bloom of cyanobacteria in the "blooming" water body. During the bloom of cyanobacteria, the absolute and relative content of the Leu-Glu group increased, while the contents of other acids generally dropped. Before and after the bloom, no significant variations in the total amino acid composition were recorded. In the reservoir where eukaryotic microalgae dominated, no significant variations in amino acid composition were recorded during the season.
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