Diurnal variation of phytoplankton pigments and population in the nearshore waters off Thal (Maharashtra)

M.J. Ram, B.N. Desai, S.A.H. Abidi

Abstract



Variations in phytoplankton species and pigments at three stations off Thal were studied for a period of 24 hrs in March and October, 1980 phytoplankton cell counts and pigment values were maximum around mid-day and mid-night which coincided with high tide. The number of phytoplankton species was maximum during day time at the offshore station whereas minimum number of species was obtained at the nearshore station. Pleurosigma, Coscinodiscus, Nitzschia, Navicula, Thalassionema, Thalassiothrix, Thalassiosira, Rhizosolenia, Amphora and Asterionella were commonly found in the collections. A bloom of Ceratium was observed in October

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