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    Primary description of surface water phytoplankton pigment patterns in the Bay of Bengal

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    J_Sea_Res_65_435a.pdf (362.2Kb)
    Date
    2011
    Author
    Naik, R.K.
    Anil, A.C.
    Narale, D.D.
    Chitari, R.R.
    Kulkarni, V.V.
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    Abstract
    Spatial and temporal variations in surface water phytoplankton pigment distribution in the Bay of Bengal were studied during the spring intermonsoon (SpIM, February–April) and the commencement of the summer monsoon (CSM, May–June), using pigment and diagnostic indices. The Prokaryotic pigment index (Prok sub (DP)) was dominant at all the oceanic stations whereas the Flagellate pigment index (Flag sub (DP)) was dominant at the near coastal stations. However, during the commencement of summer monsoon, an oscillation in the dominance of Prok sub (DP) and Flag sub (DP) was observed in the central oceanic bay, whereas flagellates and diatoms were dominant at the near coastal stations. This change in pigment pattern is possibly related to the influence of rainfall. Comparison of pigment data with microscopic cell counts indicated a significant relationship between the diatom pigment index (Diat sub (DP)) and diatom abundance. However, the relationship between the dinoflagellate pigment index (Dino sub (DP)) and dinoflagellate abundance was not significant. Studies coupling pigment composition analysis with microscopic analysis of phytoplankton in natural conditions should thus be a prerequisite in establishing valid biogeochemical and ecosystem models.
    URI
    http://drs.nio.org/drs/handle/2264/3855
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