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Title: Impact of Trichodesmium bloom on the plankton and productivity in the Tuticorin bay, southeast coast of India
Authors: Santhanam, R
Srinivasan, A
Ramadhas, V
Devaraj, M
Issue Date: Mar-1994
Publisher: NISCAIR-CSIR, India
Abstract: Trichodesmium thiebautii 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-degrees-30.8-degrees-C), salinity (35-35.4 x 10(-3)), pH (8.2-8.9), nitrite (0.36-1.96 mug-at. l-1), phosphate (0.32-2.53 mug-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 mug-at. l-1) concentration recorded minimal values. Density of T. thiebautii ranged from 0.01 to 17.5 x 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-a (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.
Page(s): 27-30
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.23(1) [March 1994]

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