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IJMS Vol.30(2) [June 2001] >

Title:  Vertical distribution of phytoplankton around Andaman and Nicobar Islands, Bay of Bengal
Authors: Sarojini, Y
Sarma, Nittala S
Issue Date: Jun-2001
Publisher: CSIR
Abstract:  Vertical distribution of phytoplankton in the upper 200 m water column was studied at 5 stations around the Andaman islands during October, 1996. About 143 species, belonging to 8 classes of algae are identified. Cyanophyta, particularly Trichodesmium erythreae, contributed most to the biomass but the species diversity was maximum for Bacillariophyceae and Pyrrophyceae. Dense maxima were noted at ~25 m depth in waters of the Bay of Bengal side and less dense maxima at surface in waters of the Andaman Sea side. The maxima of Pyrrophyceae occurred up to 50 m depth and that of Bacillariophyceae in the 25-75 m depth range. A vertical stratification was also observed for several species. There are differences in hydrographic features between the Bay of Bengal and Andaman Sea waters. In the former, a tongue of warmer, more saline water present at 25-150 m depth, originating from the Arabian Sea, apart from biotic factors, is held responsible for differences in the phytoplankton distribution on the two sides off the islands.
Page(s): 65-69
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Source:IJMS Vol.30(2) [June 2001]

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