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Denitrification activity is closely linked to the total ambient Fe concentration in mangrove sediments of Goa, India

DRS at CSIR-National Institute of Oceanography

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Title Denitrification activity is closely linked to the total ambient Fe concentration in mangrove sediments of Goa, India
 
Creator Fernandes, S.O.
Gonsalves, M.J.B.D.
Michotey, V.D.
Bonin, P.C.
LokaBharathi, P.A.
 
Subject Denitrification
Mangroves
Sediments
Nitrogen
 
Description Denitrification activity is closely linked to the total ambient Fe concentration in mangrove sediments of Goa, India Denitrification activity (DNT) and associated environmental parameters were examined in two mangrove ecosystems of Goa, India e the relatively unimpacted Tuvem and the anthropogenically-influenced Divar. Sampling was carried out at every 2 cm interval within the 0e10 cm depth range to determine (1) seasonal (pre-monsoon, monsoon and post-monsoon) down-core variation in DNT (2) assess the environmental factors influencing the DNT and (3) to build predictive models for benthic DNT. Denitrification generally decreased with depth and showed marked seasonal variation at both the locations. Denitrification peaked during the pre-monsoon occurring at a rate of up to 21.00 +_ 12.84 nmol N2O g-1 h-1 within 0-4 cm at both the locations. Further, DNT at pre-monsoon was significantly influenced by Fe content at Tuvem and Divar suggesting Fe-mediated nitrate respiration. The influence of other limiting substrates such as NO-3 and NO-2 was most important during the monsoon and post-monsoon especially at Divar. The multiple regression models developed could predict 67-98% of the observed variability in DNT through the seasons. About 6-9 environmental variables were required to relatively well-predict DNT in these sediments with the complexity governing DNT decreasing from pre-monsoon to postmonsoon. Our results reveal that seasonal dynamics of DNT in tropical mangrove sediments are closely linked to the total Fe at the prevailing ambient concentration in both the systems.
 
Date 2013-10-08T04:23:53Z
2013-10-08T04:23:53Z
2013
 
Type Journal Article
 
Identifier Estuarine, Coastal and Shelf Science, vol.131; 2013; 64-74
no
http://drs.nio.org/drs/handle/2264/4373
 
Language en
 
Relation Estuar_Coast_Shelf_Sci_131_64.jpg
 
Rights An edited version of this paper was published by Elsevier. Copyright [2013] Elsevier
 
Publisher Elsevier