Distribution of oxygen, sulfides and optimum temperature for sulfate reduction in Antarctic marine sediments

• Autorzy: Walker T R
• Języki publikacji: EN

Abstrakty

EN

Measurements were made of sediment characteristics, benthic microbial activity and optimum temperature for sulfate reduction at Signy Island, South Orkney Islands, Antarctica. There was little evidence to support any seasonal variation in oxygen penetration of surface sediments. Oxygen penetrated to only 1.5 to 3 mm throughout the year, despite bioturbation from a dense amphipod population. The distribution of acid volatile sulfides increased with depth below 1 cm and above this, surface sediments were lighter in colour and contained fewer sulfides. The rates of sulfate reduction increased during winter under sea-ice cover, and remained high after ice break up. Seasonal water temperature was relatively constant between -1.8 and 0.5°C. Optimum temperature for anaerobic sediment respiration was investigated using different substrates and was found to be in the range 17-27°C, suggesting that sulfate reducing bacteria are psychrotolerant as they were inhibited by low temperatures.

Słowa kluczowe

EN

distribution; oxygen; sulphide; temperature; sulphate reduction; Antarctic; marine sediment; Signy Island

• Wydawca: -
• Czasopismo: Polish Polar Research
• Rocznik: 2005
• Tom: 26
• Numer: 3
• Opis fizyczny: p.215-230,fig.,ref.

Twórcy

autor

Walker T R

• Dalhousie University, Halifax, Nova Scotia, B3H 4J1, Canada

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