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Applied and Environmental Microbiology, November 2005, p. 7575-7577, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7575-7577.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Impact of Bacterial NO3– Transport on Sediment Biogeochemistry

Mikio Sayama,1 Nils Risgaard-Petersen,2* Lars Peter Nielsen,3 Henrik Fossing,2 and Peter Bondo Christensen2

National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba 305-8569, Japan,1 National Environmental Research Institute, Department of Marine Ecology, Vejlsøvej 25, DK-8600 Silkeborg, Denmark,2 University of Aarhus, Institute of Biology, Ny Munkegade, DK-8000 Aarhus C, Denmark3

Received 14 March 2005/ Accepted 5 July 2005

Experiments demonstrated that Beggiatoa could induce a H2S-depleted suboxic zone of more than 10 mm in marine sediments and cause a divergence in sediment NO3– reduction from denitrification to dissimilatory NO3– reduction to ammonium. pH, O2, and H2S profiles indicated that the bacteria oxidized H2S with NO3– and transported S0 to the sediment surface for aerobic oxidation.

* Corresponding author. Mailing address: National Environmental Research Institute, Department of Marine Ecology, Vejlsøvej 25, DK-8600 Silkeborg, Denmark. Phone: 45 8920 1478. Fax: 45 8920 1414. E-mail: nri{at}dmu.dk.

Applied and Environmental Microbiology, November 2005, p. 7575-7577, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7575-7577.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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