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    Enumeration of bacteria from a Trichodesmium spp. bloom of the eastern Arabian Sea: Elucidation of their possible role in biogeochemistry

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    J_Appl_Phycol_23_309a.pdf (710.3Kb)
    Date
    2011
    Author
    Basu, S.
    Matondkar, S.G.P.
    Furtado, I.
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    Abstract
    The 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
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    http://drs.nio.org/drs/handle/2264/3835
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