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dc.contributor.authorBasu, S.
dc.contributor.authorMatondkar, S.G.P.
dc.contributor.authorFurtado, I.
dc.date.accessioned2011-04-08T10:53:33Z
dc.date.available2011-04-08T10:53:33Z
dc.date.issued2011
dc.identifier.citationJournal of Applied Phycology, vol.23(2); 2011; 309–319
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3835
dc.description.abstractThe carbon-flux via algal bloom events involves bacteria as an important mediator. The present study, carried out during the spring inter-monsoon month of April 2008 onboard CRV Sagar Manjusha-06 in the Eastern Arabian Sea, addresses the bloom-specific flow of carbon to bacteria via chromophoric dissolved organic matter (CDOM). Eleven stations monitored were located in the coastal, shelf and open-ocean areas off Ratnagiri (16 degrees 59′N, 73 degrees 17′E), Goa (15 degrees 30′N, 73 degrees 48′E) and Bhatkal (13 degrees 58′N, 74 degrees 33′E) coasts. Visible bloom of ‘saw-dust’ color in the Ratnagiri shelf were microscopically examined and the presence of cyanobacteria Trichodesmium erythraeum and T. thieabautii with cell concentrations as high as 3.05 x 10 sup(6) trichomes L sup(-1) was recorded. Total bacterial counts (TBC) varied between 94.09 x 10 sup(8) cells L sup(-1) in the bloom to 1.34 x 10 sup(8) cells L sup(-1) in the non-bloom area. Chromophoric dissolved organic matter (CDOM) concentrations averaged 2.27 + or -3.02 m sup(-1) (absorption coefficient 325 nm) in the bloom to 0.28 + or -0.07 m sup(-1) in the non-bloom waters respectively. CDOM composition varied from a higher molecular size with lower aromaticity in the bloom to lower molecular size and increased aromaticity in the non-bloom areas respectively. Strong positive relationship of TBC with Chlorophyll a (R sup(2)=0.65, p < 0.01) and CDOM concentrations (R sup(2)=0.8373, p=0.01) in the bloom area indicated hydrolysis and/or uptake of CDOM by bacteria. Absorption by mycosporine-like amino acid palythene was recorded in the filtrate of bloom. Morphotypes of Trichodesmium-associated bacteria revealed a higher frequency of Gram-positive rods. The role of bacteria in relation to changing CDOM nature and as a factor in affecting oxygen content of the water column is discussed in context of the Arabian Sea
dc.language.isoen
dc.publisherSpringer
dc.rightsAn edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2010] Springer.
dc.subjectcarbon-flux
dc.subjectalgal bloom
dc.subjectTrichodesmium
dc.subjectorganic matter
dc.titleEnumeration of bacteria from a Trichodesmium spp. bloom of the eastern Arabian Sea: Elucidation of their possible role in biogeochemistry
dc.typeJournal Article


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