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Predominance of anaerobic bacterial community over aerobic community contribute to intensify ?oxygen minimum zone? in the eastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Predominance of anaerobic bacterial community over aerobic community contribute to intensify ?oxygen minimum zone? in the eastern Arabian Sea
 
Creator Gonsalves, M.J.B.D.
Paropkari, A.L.
Fernandes, C.E.G.
LokaBharathi, P.A.
KrishnaKumari, L.
Fernando, V.
Nampoothiri, G.
 
Subject Arabian Sea
Productivity
OMZ
Aerobic
Anaerobic
Viable bacteria
 
Description The presence of a delicately poised mid-depth oxygen minimum zone (OMZ) makes the Arabian Sea a unique and important ecosystem. So far, various aspects responsible for its formation have been studied. However, the contributions from bacterial groups mediating its formation and maintaining its intensity are described for the first time in this study. Thus, we hypothesize that the bacterial dynamics along with organic carbon loading result in bringing about differences in the intensity of OMZ between two stations in the Eastern Arabian Sea (EAS). Water column from 2 stations, one from offshore and another from slope, in the EAS were examined for phytoplankton diversity and pertinent groups of culturable bacteria. Vertical profiles of dissolved oxygen, productivity, chlorophyll a, total organic carbon and different physiological groups of bacteria showed well-defined stratified patterns in tandem with physical and chemical stratifications of the water column. The phytoplankton diversity was higher at the slope station (SS) and was dominated by the heterotrophic dinoflagellates. The offshore station (OS) on the other hand, showed lower diversity dominated by diatoms (p
 
Date 2011-07-07T10:21:26Z
2011-07-07T10:21:26Z
2011
 
Type Journal Article
 
Identifier Continental Shelf Research, vol.31(11); 2011; 1224-1235p.
no
http://drs.nio.org/drs/handle/2264/3875
 
Language en
 
Relation Cont_Shelf_Res_31_1224.jpg
 
Rights An edited version of this paper was published by Elsevier. Copyright [2011] Elsevier
 
Publisher Elsevier