%0 Journal Article
%T Denitrification prevails over anammox in tropical mangrove sediments (Goa, India)
%+ MEB
%+ Institut méditerranéen d'océanologie (MIO)
%+ CSIR National Institute of Oceanography [India] (NIO)
%A Fernandes, Sheryl
%A Michotey, Valerie
%A Guasco, Sophie
%A Bonin, Patricia
%A Bharathi, P. A. Loka
%< avec comité de lecture
%Z MIO:12-019
%@ 0141-1136
%J Marine Environmental Research
%I Elsevier science
%V 74
%P 9-19
%8 2012
%D 2012
%R 10.1016/j.marenvres.2011.11.008
%K Anammox
%K Bacteria
%K Denitrification
%K Denitrifiers
%K Mangroves
%K Nitrogen
%K Sediments
%K ANAEROBIC AMMONIUM OXIDATION
%K MARINE-SEDIMENTS
%K NITRITE REDUCTASE
%K DENITRIFYING BACTERIA
%K NITROGEN-CYCLE
%K MICROBIAL MAT
%K WATER COLUMN
%K INORGANIC NITROGEN
%K NITRATE REDUCTION
%K CONTINENTAL-SHELF
%Z Environmental Sciences/Biodiversity and Ecology
%Z Sciences of the Universe [physics]/Ocean, AtmosphereJournal articles
%X Denitrification, anammox (Anx) and di-nitrogen fixation were examined in two mangrove ecosystemsthe anthropogenically influenced Divar and the relatively pristine Tuvem. Stratified sampling at 2 cm increments from 0 to 10 cm depth revealed denitrification as the main process of N-2 production in mangrove sediments. At Divar, denitrification was similar to 3 times higher than at Tuvem with maximum activity of 224.51 +/- 6.63 nmol N-2 g(-1) h(-1) at 0-2 cm. Denitrifying genes (nosZ) numbered up to 2 x 10(7) copies g(-1) sediment and belonged to uncultured microorganisms clustering within Proteobacteria. Anammox was more prominent at deeper depths (8-10 cm) mainly in Divar with highest activity of 101.15 +/- 87.73 nmol N-2 g(-1) h(-1) which was 5 times higher than at Tuvem. Di-nitrogen fixation was detected only at Tuvem with a maximum of 12.47 +/- 8.36 nmol N-2 g(-1) h(-1). Thus, in these estuarine habitats prone to high nutrient input, N-2-fixation is minimal and denitrification rather than Anx serves as an important mechanism for counteracting N loading. (C) 2011 Elsevier Ltd. All rights reserved.
%G English
%L hal-00700304
%U https://hal.science/hal-00700304
%~ SDE
%~ INSU
%~ UNIV-TLN
%~ CNRS
%~ UNIV-AMU
%~ MIO
%~ OSU-INSTITUT-PYTHEAS
%~ GIP-BE
%~ MIO-MEB