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Nitrate and sulfate reducers-retrievable number of bacteria and their activities in Indian waters

DRS at CSIR-National Institute of Oceanography

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Title Nitrate and sulfate reducers-retrievable number of bacteria and their activities in Indian waters
 
Creator LokaBharathi, P.A.
Nair, S.
Chandramohan, D.
 
Description Culturable heterotrophic, nitrate reducing and sulfate reducing bacteria (HB, NRB and SRB) were enumerated from 25, 50, 100 and 200 m depths at 15 stations and their potential activities viz. Nitrate reducing (NRA) and Sulfate reducing (SRA) were determined. NRB and SRB were observed throughout these depths and did not relate to HB numbers. HB and NRB were recorded at 3 orders per ml and SRB at 2. High numbers of reducers were encountered in shallow depths as frequently as in deeper waters and did not correlate to potential activities. Average NRA showed decreasing trend with depth from 60 mu g at/ml/hr. at 25 m to 2.4 mu g at/ml/hr. at 100 m. However the activity was 2.6 times higher at 200 m when compared to that at 25 m. SRA showed a steady decreasing trend from 0.16 mu g at/ml/hr at 25 m to 0.03 mu g at/ml/hr at 200 m. It is suggested that while activities of SRB and shallow water NRB are dependant more on the carbon regime of their source, NRA of the deeper waters are more dependant on the nitrate regime
 
Date 2009-05-08T09:00:02Z
2009-05-08T09:00:02Z
1992
 
Type Conference Article
 
Identifier Oceanography of the Indian Ocean. Ed. by: Desai, B.N., 47-55p.
http://drs.nio.org/drs/handle/2264/2966
 
Language en
 
Rights Copyright [1992]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Oxford and IBH, New Delhi