Diel changes in phytoplankton population in the Mandovi and Zuari estuaries of Goa

V.P. Devassy, R.M.S. Bhargava


Diel changes in surface phytoplankton were studied in Mandovi and Zuari estuaries during pre-and post-monsoon seasons at two stations in each estuary - one near the mouth and other in mid-reaches. Phytoplankton cell counts indicated an overall greater value in the Mandovi. Mean counts for the whole day (24 hours) at the mouth of Mandovi and at mid-reaches were 13,600 and 15,200 cells/l respectively in the premonsoon. In the post-monsoon period the counts were 55,800 and 37,600 cells/l. The corresponding figures for the Zuari were 10,100 and 17,200 cells/l in the premonsoon and 2,100 and 2,000 cells/l in the post-monsoon. In general, higher concentrations of phytoplankton were noticed in the morning hours during premonsoon in the Mandovi and during post-monsoon in the Zuari indicating seasonal changes in the two estuaries. The two estuaries, thus exhibit a contrasting picture during the two seasons


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