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Abstract: Phytoplankton communities were studies and monitored at 23 stations on the coasts of Phuket Island.
Sampling were done bimonthly from April 2006 to February 2007. An amount of 20 liters seawater at each
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recorded. Class Cyanophyceae 3 Genus, 46 Genus in Class Bacillariophyceae, 12 Genus in Class Dinophyceae
and 1 Genus in Class Dictyophyceae.The dominant species were belonging to genus Rhizosolenia Oscillatoria
Chaetoceros and Thalassiosira. The most abundance of phytoplankton was found in August 2006 (50,042 cells
per cubic meter) while in December 2006 less was found (1,279 cells per cubic meter). Statistical analysis
showed that the values of species diversity index, similarity index and richness index ranged among 0.25–1.17,
0.370.99 and 1.142.79 respectively. For the statistical analysis analysis of relationships between aquatic
environmental factors and phytoplankton distribution, the results demonstrated the phytoplankton density had
negation relation with the concentration of TSS, Nitrate and Nitrite. Rhizosolenia blooms were found during
these investigations at Para Bay in August 2005. Chaetoceros blooms were also found especially at Patong
Beach in January 2006. The blooms of Rhizosolenia and Chaetoceros on these occasions were not serious to
Keywords : Phytoplankton, Andaman Sea, Phuket
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