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Distribution and seasonal variation of concentrations of particulate carbohydrates and uronic acids in the northern Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Distribution and seasonal variation of concentrations of particulate carbohydrates and uronic acids in the northern Indian Ocean
 
Creator Khodse, V.B.
Fernandes, L.
Gopalakrishna, V.V.
Bhosle, N.B.
Fernandes, V.
Matondkar, S.G.P.
Bhushan, R.
 
Subject Total carbohydrates
Carbohydrate yields
Northern Indian Ocean
Neutral carbohydrates
 
Description Suspended particulate matter (SPM) samples were collected from the surface seawaters at 31 stations, and from various depths (2 to 1000 m) at 9 locations in the northern Indian Ocean during various seasons. SPM samples were analyzed for total particulate carbohydrate (TPCHO), total particulate uronic acid (TPURA) and total particulate neutral carbohydrate (TPNCHO) concentrations and composition. Strong spatial, temporal and depth related variations were evident in the distribution of these compounds. In surface waters, concentrations of TPCHO, TPNCHO, and TPURA varied from 0.57 to 3.58 µM C, 0.11 to 2.34 µM C, and from 0.01 to 0.31 µM C, respectively, and accounted for 2.6 to 34.6 %, 2 to 24.5 %, and 0.2 to 6.3 % of POC, respectively, whereas the TPURA accounted for 4.7 to 22.7 % of TPCHO. Concentrations and yields of both TPNCHO and TPURA decreased rapidly in the upper 100 m of the water column suggesting their utilization by heterotrophic organisms. Glucose was the most abundant constituent of the TPNCHO. Glucose mole fraction decreased while that of other monosaccharides, especially galactose, arabinose, mannose, rhamnose and fucose increased in the upper 100 m water. Below this depth, mole fraction of glucose increased while that of other sugars decreased with the increasing water depth. Generally, high C:N ratios were associated with low yields of carbohydrates and uronic acids. Inverse correlation between the mole fractions of arabinose plus xylose and rhamnose plus fucose indicates the importance of biogenic and terrestrial organic matter input to the Bay of Bengal. TPURA are surface-active in nature and thus may play an important role in coagulation of particles and macromolecules. The observed spatial and 3 seasonal variations of these compounds may be due to differences in phytoplankton biomass, nutrient status, and the influence of terrestrial material.
 
Date 2007-09-06T09:04:14Z
2007-09-06T09:04:14Z
2007
 
Type Journal Article
 
Identifier Marine Chemistry, vol.103(3-4); 327-346p.
http://drs.nio.org/drs/handle/2264/655
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2007] Elsevier
 
Format 2872763 bytes
application/pdf
 
Publisher Elsevier