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Denitrification prevails over anammox in tropical mangrove sediments (Goa, India)

DRS at CSIR-National Institute of Oceanography

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Title Denitrification prevails over anammox in tropical mangrove sediments (Goa, India)
 
Creator Fernandes, S.O.
Michotey, V.D.
Guasco, S.
Bonin, P.C.
LokaBharathi, P.A.
 
Subject mangrove swamps
nitrogen cycle
oxidation
denitrification
 
Description Denitrification, anammox (Anx) and di-nitrogen fixation were examined in two mangrove ecosystems- the 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 sub(2) production in mangrove sediments. At Divar, denitrification was approx 3 times higher than at Tuvem with maximum activity of 224.51 + or -6.63 nmol N sub(2) g sup(−1) h sup(−1) at 0–2 cm. Denitrifying genes (nosZ) numbered up to 2×10 sup(7) copies g sup(−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 + or -87.73 nmol N sub(2) g sup(−1) h sup(−1) which was 5 times higher than at Tuvem. Di-nitrogen fixation was detected only at Tuvem with a maximum of 12.47 + or -8.36 nmol N sub(2) g sup(−1) h sup(−1). Thus, in these estuarine habitats prone to high nutrient input, N sub(2)-fixation is minimal and denitrification rather than Anx serves as an important mechanism for counteracting N loading.
 
Date 2012-02-03T03:59:24Z
2012-02-03T03:59:24Z
2012
 
Type Journal Article
 
Identifier Marine Environmental Research, vol.74; 2012; 9-19
no
http://drs.nio.org/drs/handle/2264/4008
 
Language en
 
Relation Mar_Environ_Res_74_9.JPG
 
Rights An edited version of this paper was published by Elsevier. Copyright [2011] Elsevier
 
Publisher Elsevier