Phytoplankton diversity in Pichavaram mangrove waters from south-east coast of India.
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Date
2009-07
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Abstract
The results of an investigation carried out during September 2002 to August 2003 on hydrography, composition and community
structure of phytoplankton including chlorophyll ‘a’ (Chl-a) content and primary productivity (PP) of the Pichavaram mangrove (South-east coast
of India) are reported. Atmospheric and surface water temperatures varied from 30.0 to 34.8oC and from 29.7 to 34.2oC respectively while the
light extinction coefficient values (LEC) (K) ranged between 3.2 and 14.9. Salinity values varied from 9.6 to 35.4‰ and the pH ranged between
7.2 and 8.6. Variation in dissolved oxygen content was from 3.2 to 6.5 ml l-1. The ranges of inorganic nutrients viz., nitrate, nitrite, phosphate
and silicate were: 7-36.23, 0.31-5.46, 0.28-3.70 and 12.26-56.64 μM respectively. Chlorophyll ‘a’ content ranged between 0.20 and
105.60 ;g l-1 and the ranges of gross and net primary productivities (PP) were: 16.54-826.8 and 11.52-610.2 mg C m-3 hr -1respectively. Presently
a total of 94 species of phytoplankton were identified. Among these, the diatoms formed predominant group. Population density of phytoplankton
varied from 400 to 3,21,000 cells-1. While the peak diversity (5.23 bits / ind.) of the phytoplankton was observed during summer season, the
maximum population density was found during summer season coinciding with the stable hydrographical conditions.
Description
Keywords
Nutrients, Primary production, Phytoplankton, Pichavaram, Mangroves
Citation
Rajkumar M, Perumal P, Prabu V Ashok, Perumal N Vengadesh, Rajasekar K Thillai. Phytoplankton diversity in Pichavaram mangrove waters from south-east coast of India. Journal of Environmental Biology. 2009 July; 30(4): 489-498.