Abstract
Pore water, sediment and microbiological samples were collected from two areas in the Gulf of Maine. The Jeffreys Basin sediments had low organic carbon and low reduced sulfur values; the quality of their pore water indicated that nitrification and subsequent denitrification were major biogeochemical processes occurring in the upper 115 cm. Sediments from the Wilkinson Basin had higher values of organic carbon and higher reduced sulfur and total plate-count bacteria. These data indicate that the major biogeochemical processes occurring in these sediments are denitrification followed by sulfate reduction. The differences in the rates of these microbially mediated processes can be related to differences in sedimentation rates at the two sites.
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