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Short-term variability in halocarbons in relation to phytoplankton pigments in coastal waters of the central eastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Short-term variability in halocarbons in relation to phytoplankton pigments in coastal waters of the central eastern Arabian Sea
 
Creator Roy, R.
 
Subject chlorinated hydrocarbons
community composition
phytoplankton
phytoplanktonpigments
 
Description Halocarbons released from oceans are known to be important in the atmospheric processes. Their abundance in seawater is influenced by water column conditions and phytoplankton community. In the present study halocarbon abundances together with pigment composition were monitored in the coastal waters of the central eastern Arabian Sea. Short-term variability for the period December 2005-March 2007 was studied for chlorinated hydrocarbons (CHCl sub(3), CCl sub(4)) and bromocarbons (CH sub(2)Br sub(2) and CHBr sub(3)) for the first time in the Arabian Sea. Variability in pigments was used to understand the influence of phytoplankton community composition on halocarbon concentrations in this region. Halocarbons and phytoplankton pigments showed strong short-term variability, with maximal values generally associated with southwest (summer) monsoon high productivity. Decreased chlorocarbon abundances in sub-surface layers indicate their possible consumption under oxygen deficient conditions, particularly during the summer monsoon and Fall-Intermonsoon periods. Halocarbon abundances were in the order: CHCl sub(3), CH sub(2)Br sub(2), CHBr sub(3) and CCl sub(4). The CHCl sub(3) showed significant positive relationship with fucoxanthin (r = 0.93, p = 0.001, n = 155) suggesting the importance of diatoms and prymnesiophytes in the Arabian Sea. Among the phytoplankton pigments chlorophyll-a showed a positive relationship with marker pigment fucoxanthin. Of the four phytoplankton groups studied, the percent dominance was in the order: diatoms > nanoflagellates > cyanobacteria > dinoflagellates. Our study shows that the utilization of halocarbons during microbial oxidation of organic matter could be a significant sink of these compounds although they might be produced in significant quantities by biochemical processes during high productivity periods, a scan be seen from our observations in summer monsoon in the Arabian Sea
 
Date 2010-06-21T07:39:19Z
2010-06-21T07:39:19Z
2010
 
Type Journal Article
 
Identifier Estuarine, Coastal and Shelf Science, vol.88(3); 311-321
no
http://drs.nio.org/drs/handle/2264/3639
 
Language en
 
Relation Estuar_Coast_Shelf_Sci_88_311.JPG
 
Rights An edited version of this paper was published by Elsevier. Copyright [2010] Elsevier
 
Publisher Elsevier