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

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    Mar_Environ_Res_74_9a.pdf (281.1Kb)
    Date
    2012
    Author
    Fernandes, S.O.
    Michotey, V.D.
    Guasco, S.
    Bonin, P.C.
    LokaBharathi, P.A.
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    Abstract
    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.
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    http://drs.nio.org/drs/handle/2264/4008
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