Journal
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
Volume 84, Issue 3, Pages 629-632Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S002531540400966Xh
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In a benthic mesocosm experiment, the effects of two species of burrowing Thalassinidean shrimps (Callianassa subterranea and Upogebia deltaura) on rates of sediment denitrification were determined using the isotope pairing technique. Denitrification rate (D-tot) and coupled nitrification-denitrification (D-n) were shown to be significantly enhanced by the presence of U. deltaura by 2.9 and 3.3 times respectively, relative to control measurements. For U deltaura the stimulation of the denitrification rate was found to be significantly related to the size of the animal (F=5.81, P=0.042). No deviation from the rates determined in control cores for either D-tot or D-n was observed for those cores inhabited by C. subterranea. The increase in D-tot with U deltaura was considered to be the result of a combination of different factors, including; the direct extension of the sediment-water interface and an increase in oxygenation of the sediments and solute transport, as a result of the ventilating activities of the animal itself.
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