Bacterial methanogenesis in holocene sediments of the Baltic sea

Lein, Alla Yu; Намсараев, Б. Б.; Trotsyuk, V. Ya.; Ivanov, Mark V.

doi:10.1080/01490458109377770

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…The experimentally determined methane production rates of the upper 20 cm of the sediment are within the range found in offshore marine sediments of the Black Sea (Heyer 1990), Bering Sea (Griffiths et al 1982) or open Baltic Sea (Lein et al 1981). They also fit very well to the data obtained by Lein et al (1981) in the Gotland Deep (Stn 2622) with the radiotracer method (reduction of '"CO2).…”

Section: Methane Production Ratessupporting

confidence: 69%

“…They also fit very well to the data obtained by Lein et al (1981) in the Gotland Deep (Stn 2622) with the radiotracer method (reduction of '"CO2). These authors determined a rate of methanogenesis of 5.4 pm01 m-2 d-' within the top 15 cm (recalculated after the given data), which is in the range of rates in our study (3.0 to 8.5 pm01 m-2 d-l).…”

Section: Methane Production Ratessupporting

confidence: 66%

“…As discussed above on the basis of the methane concentration profiles this process is expected to occur in the depth range in question. However, Lein et al (1981), applying the tracer method for measuring methanogenesis in Gotland Basin sediments of different depths, also found no or only minimum activity below the surface maximum and increasing activity at depths of 85 cm or more. In comparison with methane flux rates in the surface layers (Table l ) , the integrated in situ methane production (0 to 20 cm) contributed 6 to 20% to the surface methane flux and may considerably influence the diffusion from the sediment to the water column during anoxic periods.…”

Section: Methane Production Ratesmentioning

confidence: 99%

“…, Schmaljohann 1996. First studies concerning rates of methanogenesls and sulfate reduction in sediments of deep brackish water bodies in the Baltic Sea were published by Lein et al (1981) and Lein (1983).…”

Section: Introductionmentioning

confidence: 99%

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Dissimilatory sulfate reduction and methane production in Gotland Deep sediments (Baltic Sea) during a transition period from oxic to anoxic bottom water (1993-1996)

Piker¹,

Schmaljohann²,

Imhoff³

1998

Aquat. Microb. Ecol.

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During a transition period from oxic to anoxic conditions in the bottom water, rates of sulfate reduction and methane production, methane fluxes, as well as concentration profiles of sulfate, sulfide and methane were measured in sediments at a central site of the Gotland Deep (Stn AL 93. 241 m depth), which is regarded as representative for the deepest part of this basin. During this period from 1993 to 1996 oxic conditions in the bottom water prevailed from spring 1994 until summer 1995 with oxygen concentrations decreasing progressively with time. In the sediments methane production occurred primarily in layers below 1 m depth and flux rates of methane to the sediment surface were characterized by a steep concentrat~on gradient from approx. 5 mM at 4 m depth to values close to 30 pM at the surface, determined by diffusion processes and anaerob~c oxidation of methane. Both processes were independent of changes at the sediment surface Differences in the flux rates of methane between the deeper part with a mean value of 259 pm01 m-' d-' and the upper layers with a mean of 47.7 pm01 m-2 d-' indicate that a considerable proportion of the methane is oxidized within the anoxic horizon of the sediment (71 to 86% in the layer from 40 to 70 cm). Low rates of methane production found within the top 20 cm of the sediment during periods of oxic bottom water increased after depletion of oxygen and resulted in a clear maximum of the methane concentration in the top 2 cm. Sulfate concentrations declined exponentially from values of 11.5 mM in June 1994 and 8.5 mM in October 1995 at the sediment surface to values of 2.5 mM at 20 cm depth and of less than 0.5 mM at 50 to 60 cm depth. High sulfate reduction rates (150 to 250 nmol cm-3 d-') in the upper part of the sediment (8 to 13 cm) coincided with maxima of sulfide concentrations. During the time period of this investigation an increase of maximum sulfide concentrations in the sediment from 1 to 10 mM was measured together with decreasing oxygen concentrations in the deep water. At the same time sulfate reduction established a small but distinct maximum at the top layer of the sediment (0 to 2 cm). The relative ~mportance of sulfate reduction and methanogenesis in the carbon budget of the Gotland Deep sediments is calculated on the basis of the actual measurements.

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Section: Methane Production Ratessupporting

confidence: 69%

Section: Methane Production Ratessupporting

confidence: 66%

Section: Methane Production Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dissimilatory sulfate reduction and methane production in Gotland Deep sediments (Baltic Sea) during a transition period from oxic to anoxic bottom water (1993-1996)

Piker¹,

Schmaljohann²,

Imhoff³

1998

Aquat. Microb. Ecol.

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“…Tsiban et al, (1980) observed between 10 and 10,000 ml' 1 and Kim (1983) found especially high accumulations of lipolytic bacteria in the bacterio-neuston. In the Gulf of Riga and the'depression of the Baltic proper, Lein et al (1981) determined 10-1,000 methanogenic bacteria g" 1 wet mud. Iversen and Blackburn (1981) calculated the seasonal rates of methane oxidation in anoxic Sediment in the Kysing Fjord (Denmark).…”

Section: Bacterial Activity and Breakdown Of Organic Mattermentioning

confidence: 99%