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The impact of two species of bioturbating shrimp (Callianassa subterranea and Upogebia deltaura) on sediment denitrification

Published online by Cambridge University Press:  24 May 2004

Rebecca L. Howe ,
Andrew P. Rees  and
Stephen Widdicombe
Rebecca L. Howe
Affiliation:
Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, UK University of Plymouth, Drake's Circus, Plymouth, PL4 8AA, UK
Andrew P. Rees
Affiliation:
Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, UK
Stephen Widdicombe
Affiliation:
Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, UK
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Abstract

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 (Dtot) and coupled nitrification–denitrification (Dn) 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 Dtot or Dn was observed for those cores inhabited by C. subterranea. The increase in Dtot 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.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 84 , Issue 3 , June 2004 , pp. 629 - 632
Copyright
2004 Marine Biological Association of the United Kingdom

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