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    Variability of organic nitrogen and its role in regulating phytoplankton in the eastern Arabian Sea

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    Mar_Poll_Bull_141_550.pdf (776.8Kb)
    Date
    2019
    Author
    Shetye, S.S.
    Kurian, S.
    Naik, H.
    Gauns, M.
    Chndrasekhararao, A.V.
    Kumar, Ashwini
    Naik, B.
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    Abstract
    The relative importance of organic nitrogen (ON) and inorganic nitrogen (IN) as nitrogen sources for the phytoplankton communities were studied through a seasonal time series of nitrogen species in the eastern Arabian Sea. Seasonal data on nitrogen species showed that ON dominates the system throughout the year and account for >90% of the total nitrogen (TN) during north east monsoon (NEM). The average ON concentration in the study region was 11.5--M during NEM as compared to 7.2--M during south west monsoon (SWM). The contribution of picoplankton to the total phytoplankton pool (fpico) increased from 19% during SWM to 36% in NEM. Along with cyanobacteria, the diatoms Thalassionema nitzchoides and Thalassiosira sp. and among the dinoflagellates Pronoctiluca sp. were found to proliferate in ON rich waters. We suggest atmospheric deposition, riverine-input, resuspension of bottom sediment and ground water intrusion as the possible sources of ON in the study region.
    URI
    https://doi.org/10.1016/J.MARPOLBUL.2019.02.036
    http://drs.nio.org/drs/handle/2264/8150
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