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Distribution, origin and transformation of amino sugars sand bacterial contribution to estuarine particulate organic matter

DRS at CSIR-National Institute of Oceanography

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Title Distribution, origin and transformation of amino sugars sand bacterial contribution to estuarine particulate organic matter
 
Creator Khodse, V.B.
Bhosle, N.B.
 
Subject Bacteria
estuary
biomarker
monsoon
 
Description Amino sugars including bacterial biomarker muramic acid(Mur) were investigated in suspended particulate matter(SPM) to understand their distribution, origin, and biogeochemical cycling and the contribution of bacteria to particulate organic matter (POM) of the Mandovi estuary. SPM was collected from 9 sampling stations in the Mandovi estuary during the pre-monsoon (March) and monsoon (August). Total particulate amino sugar (TPAS) concentrations and yields varied spatially and were 2 to 5 times higher during the monsoon than the pre-monsoon. Negative correlation between salinity and TPAS-C yields [TPAS-C/particulate organic carbon (POC)x100] indicates the influence of terrestrial organic matter on the transport of TPAS-carbon. Glucosamine (GlcN),galactosamine (GalN),andmannosamine (ManN) were abundant during the monsoon. LowGlcN/GalNratios(o3) indicate bacteria as the major source of amino sugars. Higher amino sugar yields and lower GlcN/GalNratios during the monsoon than the pre-monsoon indicate enhanced transformation and greater bacterial contribution to POM during the former season. Degradation trends observed with TPAS were well supported by those obtained with carbohydrates andaminoacids. Based on Murconcent rations,bacteria accounted for 24% to 35% of the POC and 24%to 62% of the total particulate nitrogen (TPN). Intact bacterial cells, however accounted for a small proportion of POC(2.5% to 4%)and TPN(9% to 11%). Our study suggests that POM was subjected to extensive diagenetic transformation, and its composition was influenced by bacteria, especially during the monsoon.
 
Date 2013-10-08T04:24:23Z
2013-10-08T04:24:23Z
2013
 
Type Journal Article
 
Identifier Continental Shelf Research, vol.68; 2013; 33-42
no
http://drs.nio.org/drs/handle/2264/4377
 
Language en
 
Relation Cont_Shelf_Res_68_33.jpg
 
Rights An edited version of this paper was published by Elsevier. Copyright [2013] Elsevier
 
Publisher Elsevier