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Effect of bioturbation on denitrification in a marine sediment from the West Mediterranean littoral

Gilbert, Franck and Bonin, Patricia and Stora, Georges Effect of bioturbation on denitrification in a marine sediment from the West Mediterranean littoral. (1995) Hydrobiologia, 304 (1). 49-58. ISSN 0018-8158

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Official URL: http://dx.doi.org/10.1007/BF02530703

Abstract

The in vitro effect of Nereis diversicolor on denitrification has been studied in PVC tubes filled with a coastal marine sediment defaunated by sieving. The first aim of the experiment was to determine the effect of sediment defaunation on denitrification (denitrifying population and Denitrifying Enzyme Assays). Sieving induced a loss of 70% of the initial DEA. The number of denitrifying bacteria was 10 times lower than inin situ sediment. In the top two centimetres, the DEA rose by 75% of its initial value, after 82 days. Polychaetes were only added after a return to near pre-disturbance levels to ensure that our data on the effects of their addition would not be disturbed by changes in the sediment. Introduction of Polychaetes increased the denitrifying population and DEA in the first layer (0–2 cm) of the sediment after 15 days. After 45 days, the surface of the polychaete burrows in sediment was 1.3 to 1.5 times higher than after 15 days, resulting in an increase in solute exchange between seawater and the top layer of sediment. An inhibitory effect of oxygen on denitrification was detected in the uppermost layer only.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://link.springer.com/article/10.1007%2FBF02530703
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Université de la Méditerranée - Aix-Marseille II (FRANCE)
Laboratory name:
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Deposited By: Franck Gilbert
Deposited On:29 Jan 2013 10:52

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