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    Mud Banks along the southwest coast of India are not too muddy for plankton

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    Scie_Rep_8_2544a.pdf (3.605Mb)
    Date
    2018
    Author
    Jyothibabu, R.
    Balachandran, K.K.
    Jagadeesan, L.
    Karnan, C.
    Arunpandi, N.
    Naqvi, S.W.A.
    Pandiyarajan, R.S.
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    Abstract
    Considering Alappuzha Mud Bank in the southern Kerala coast as a typical case of biologically productive Mud Banks that form along the southwest coast of India during the Southwest Monsoon (June - September), the present study addresses several pertinent missing links between the physical environment in Mud Banks and their influence on plankton stock. This study showed that very strong coastal upwelling prevails in the entire study domain during the Southwest Monsoon, which manifests itself in the form of significantly cool, hypoxic and nitrate-rich waters surfacing near the coast. The upwelled water persisting throughout the Southwest Monsoon period was found to have fuelled the exceptionally high phytoplankton stock in the entire study area, including the Mud Bank region. Having accepted that Mud Banks are special because of the calm sea surface conditions and relatively high turbidity level in the water column around them, the present study showed that except at points close to the sea bottom, turbidity level in the Alappuzha Mud Bank was below the critical level to inhibit the plankton stock. The suspended sediments that form in the Mud Bank occasionally could be attributed to the disturbance of the bottom fluid muddy layer and their vertical spurts.
    URI
    https://doi.org/10.1038/s41598-018-20667-9
    http://drs.nio.org/drs/handle/2264/8165
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