Anaerobic metabolism in lagoon sediments from Davies Reef,Great Barrier Reef |
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| Institution: | 1. School of Environment, Science and Engineering, Southern Cross University, Lismore, NSW, Australia;2. Marine Ecology Research Centre, Southern Cross University, Lismore, NSW, Australia;1. The University of Arizona, Department of Biosystems Engineering, Tucson, AZ 85721, USA;2. The University of Arizona, School of Plant Sciences, Tucson, AZ 85721, USA;3. Pacific Northwest National Laboratory, Richland, WA 99352, USA;4. The University of Arizona, Department of Chemical and Environmental Engineering, Tucson, AZ 85721, USA |
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| Abstract: | Sulphate reduction rates were measured in the lagoon sediments at Davies Reef, on the Great Barrier Reef, Australia. Sulphate reduction rates averaged 0·622 mmol sulphate m?2 day?1, over the 0–12 cm depth of sediment, compared to an average heterotrophic oxygen uptake rate by the sediment of 27 mmol oxygen m?2 day?1. Thus sulphate reduction to acid-volatile sulphide appeared to account for only about 5% of the total organic matter degradation, although the proportion may be greater if sulphate reduction to tin-reducible sulphide was taken into account. Although dissolved sulphate concentration in the sediment pore water was that of sea water, a large excess (equivalent to about 0·8% of the sediment dry weight) of precipitated sulphate was present in the sediment. This excess could not be attributed to precipitated strontium sulphate, and there was no exchange between the dissolved and precipitated sulphate. Methane formation in these superficial sediments was not detectable. |
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