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Bacterial production, glucosidase activity and particle-associated carbohydrates in Dona Paula bay, west coast of India

DRS at CSIR-National Institute of Oceanography

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Title Bacterial production, glucosidase activity and particle-associated carbohydrates in Dona Paula bay, west coast of India
 
Creator Bhaskar, P.V.
Bhosle, N.B.
 
Subject microorganisms
polymerization
enzymatic activity
particulate organic carbon
 
Description Size-fractionated bacterial production, abundance and Alpha - and Beta - glucosidase enzyme activities were studied with respect to changes in hydrography, total suspended matter (TSM), chlorophyll a, particulate organic carbon and nitrogen ratio (POC:PON), 1.5 M NaCl-soluble and 10 mM EDTA-soluble carbohydrates (Sal-PCHO and CPCHO) and transparent exopolymeric particles (TEP) in the surface waters from July 1999-2000 at a shallow coastal station in Dona Paula Bay, west coast of India. The bulk of the total bacterial production and glucosidase activity were associated with particles (75% and more than 80%, respectively). Total bacterial production was linearly correlated to chlorophyll a (r = 0.513; p less than 0.05) whereas enzyme activity was significantly correlated to TSM (Alpha glucosidase: r = 0.721 (p less than 0.001); Beta -glucosidase: r = 0.596 (p less than 0.01)). Both Alpha-glucosidase (r = 0.514; p less than 0.05) and Beta - glucosidase enzymes (r = 0.598; p less than 0.01) appeared to be involved in the degradation of CPCHO and Sal PCHO, respectively. Changes in Alpha -glucosidase / Beta glucosidase ratios highlighted the varying composition of particulate organic matter. The bacterial uptake of sup 14(C) - labeled bacterial extracellular carbohydrate measured over 11 days showed a strong linear correlation between sup 14(C) - uptake and bacterial production using tritiated thymidine. The turnover rate of sup 14 (C) - labeled carbohydrate - C was 0.52 d sup(-1), higher than the estimated annual mean potential carbohydrate carbon turnover rate of 0.33 + or - 0.2 d sup(-1). Our study suggests that carbohydrates derived from sediments may serve as an important alternative carbon source sustaining the bacterial carbon demand in the surface waters of Dona Paula Bay.
 
Date 2008-11-24T11:58:55Z
2008-11-24T11:58:55Z
2008
 
Type Journal Article
 
Identifier Estuarine, Coastal and Shelf Science, vol.80; 413-424p.
http://drs.nio.org/drs/handle/2264/1494
 
Language en
 
Rights Copyright [2008]. 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 Elsevier