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Microbial sulfate reduction in a brackish meromictic steppe lake [Text] / D. B. Kosolapov [et al.] // Aquat. Ecol. - 2003. - Vol. 37, Is. 3. - P. 215-226, DOI 10.1023/A:1025871300917. - Cited References: 43 . - ISSN 1386-2588

РУБ Ecology + Limnology + Marine & Freshwater Biology
Рубрики:
REDUCING BACTERIA
   SULFUR-COMPOUNDS
   LITTORAL SEDIMENT
   INORGANIC SULFUR
   EUTROPHIC LAKE
   SALT-LAKE
   RATES
   MARINE
   CYCLE
   TEMPERATURE
Кл.слова (ненормированные):
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.

WOS
Держатели документа:
Russian Acad Sci, Inst Biol Inland Waters, Yaroslavl 152742, Russia
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kosolapov, D.B.; Rogozin, D.Y.; Gladchenko, I.A.; Kopylov, A.I.; Zakharova, E.E.

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Seasonal dynamics of amino acids in two small Siberian reservoirs dominated by prokaryotic and eukaryotic phytoplankton [Text] / G. S. Kalachova [et al.] // Aquat. Ecol. - 2004. - Vol. 38, Is. 1. - P. 3-15, DOI 10.1023/B:AECO.0000021044.55658.71. - Cited References: 37 . - ISSN 1386-2588

РУБ Ecology + Limnology + Marine & Freshwater Biology
Рубрики:
DISSOLVED ORGANIC-MATTER
   PARTICULATE FATTY-ACIDS
   FRESH-WATER ECOSYSTEMS
   BACTERIAL PRODUCTION
   CHEMICAL-COMPOSITION
   RATES
   MICROALGAE
   PROTEINS
   RELEASE
   DAPHNIA
Кл.слова (ненормированные):
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.

WOS
Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kalachova, G.S.; Kolmakova, A.A.; Gladyshev, M.I.; Kravchuk, E.S.; Ivanova, E.A.

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