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Impact of Trichodesmium bloom on the plankton and productivity in the Tuticorin bay, southeast coast in India

Impact of Trichodesmium bloom on the plankton and productivity in the Tuticorin bay, southeast coast in India

Indian Journal of Marine Sciences 23(1): 27-30

Trichodesmium theibautii bloom was noticed on 2 March 1989 in Tuticorin bay, and hydrobiological investigations were carried out between 2 and 8 March 1989, when the bloom culminated. While the water temperature (29.1 degree -30.8 degree C), salinity (35-35.4 times 10-3), pH (8.2-8.9), nitrite (0.36-1.96 mu-g-at. l-1), phosphate (0.32-2.53 mu-g-at. l-1) and particulate organic carbon (7.12-29.54 g.m-3), showed generally higher values in association with maximum bloom density, dissolved oxygen (3.2-5.2 ml.l-1) and nitrate (0.2-0.78 mu-g-at. l-1) concentration recorded minimal values. Density of T. thiebautii ranged from 0.01 to 17.5 times 10-6 filaments. l-1 during the bloom period. While the maximum species diversity (1.49) was associated with minimum bloom density, the maximum chlorophyll-alpha (535.26 mg.m-3), primary production (512 mg C.m.-3h-1) and microzooplankton (72,000 no.l-1) coincided with the maximum bloom density. Interestingly, the total number of other phytoplankton and macrozooplankton were at minimum levels (ie, 120 cells. l-1 and 2 no.l-1) in association with the maximum bloom density.

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