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    Response of phytoplankton to nutrient enrichment with high growth rates in a tropical monsoonal estuary - Zuari estuary, India

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    Indian_J_Geo-Mar_Sci_42_314.pdf (658.6Kb)
    Date
    2013
    Author
    Mochemadkar, S.
    Gauns, M.
    Pratihary, A.K.
    Thorat, B.R.
    Roy, R.
    Pai, I.K.
    Naqvi, S.W.A.
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    Abstract
    Present study is about the impact of macronutrient enrichment on phytoplankton biomass and community structure in a tropical monsoonal estuary. In situ experiments carried out during the pre-monsoon period (February-March 2006), showed that the response time of phytoplankton to nutrient enhancement was 24-32 h. Phytoplankton biomass increased sizably, indicating nitrate and silicate limitation for phytoplankton growth. An increase in 23 Mew g chl a l sup (-1) resulted in an uptake of 10 Mew M nitrate, 0.6 Mew M phosphate and 17 Mew M silicate. Phytoplankton showed high growth rates with an average value of 1.36 Mew g chl l sup (-1) d sup (-1).This phytoplankton community was largely dominated by diatoms (>96%), particularly chain forming species. Relative preference index (RPI) value for nitrate was >1, suggesting that, irrespective of the ambient ammonium concentration, estuarine autotrophs preferred nitrate. Few species like Skeletonema costatum and Thalassionema nitzschioides exhibited the ability to withstand hypoxic condition
    URI
    http://drs.nio.org/drs/handle/2264/4334
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