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Seasonal variability in biological carbon biomass standing stocks and production in the surface layers of the Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Seasonal variability in biological carbon biomass standing stocks and production in the surface layers of the Bay of Bengal
 
Creator Ramaiah, N.
Fernandes, V.
Paul, J.T.
Jyothibabu, R.
Gauns, M.
Jayraj, E.A.
 
Subject Primary productivity
carbon biomass
Microzooplankton
mesozooplankton
 
Description As a part of the Bay of Bengal Process Study, several biological characteristics were investigated during summer monsoon (SuM; July-August 2001), fall inter monsoon (FIM, September-August 2002), spring inter monsoon (SpIM; April-May 2003) and northeast monsoon (NEM, Dec 2005-January 2006). Chl a carbon during SuM, FIM, SpIM and NEM averaged 688, 767, 1212 and 1057 mg C m sup(-2) in the western Bay 9WB) 518, 904, 789 and 1023 mg C m sup(-2) in the central Bay. Primary productivity (PP) averaged 326, 281, 366 and 280 mg C m sup(-2) d sup(-1) in the WB and 144, 306, 241 and 375 mg C m sup(-2) d sup(-1) in the CB respectively. Shallow euphotic depths (approx., less than 55m) apparently are not conducive for (PP) in the 0-120 m column. Heterotrophic bacterial carbon biomass was sizable and averaged 282, 662, 95 and 288 mg C m sup(-2) in the WB and was 677, 227, 104 and 333 mg C m sup(-2) in the CB during SuM, FIM, SpIM and NEM respectively. They appear very crucial in governing the abundances of microheterotrophs in the southern and, open-ocean regions of the Bay. Microzooplankton were much poorer in abundance than those in the Arabian Sea except during SpIM. Their maximum carbon biomass (WB: 233; CB: 327 mg C m sup(-2) in the top 120 m was observed during SpIM. In the upper 200 m, the mesozooplankton biomass did not show much variation between the season (WB: 222, 906, 2428 and 988 mg C m sup (-2) and CB: 587, 1036, 821 and 808 mg C m sup(-2) d sup(-1) respectively during SuM, FIM, SpIM and NEM). Incidentally it was mostly decoupled with chl a and PP. Cold-core eddies observed during most sampled seasons seem to bear an enhancing influence on the overall biological productivity processes
 
Date 2010-11-29T12:34:55Z
2010-11-29T12:34:55Z
2010
 
Type Journal Article
 
Identifier Indian Journal of Marine Sciences, vol.39(3); 369-379
http://drs.nio.org/drs/handle/2264/3751
 
Language en
 
Rights Copyright [2010]. 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 NISCAIR, CSIR