WATER QUALITY AND DIVERSITY OF PHYTOPLANKTON IN A HARD-WATER LAKE, THAILAND
Keywords:
Water quality, phytoplankton diversity, a hard-water lake, Thailand, tropical areaAbstract
A study of water quality and the diversity of phytoplankton in the Rama IX lake, a man-made lake, in Pathumthani province, Thailand. This study was conducted from February 2000 to January 2001. The lake was divided into two parts, identified by the Irrigation North Rungsit as the first and the second sections. The water quality of both sections, as classified by the National Environmental Boards standards of surface water quality, was found to be in the second category and relatively clean for household consumption when properly treated. However, the main problem was the assessment of water quality of the first section which was found to be mesotrophic to eutrophic while the second section was oligotrophic to mesotrophic. Phytoplankton found in the first section showed a total number of 86 different taxa which were divided into 9 taxonomic groups. The taxonomic groups most rich in species were Chlorophyceae with 30, Euglenophyceae with 21, Cyanophyceae with 17, Diatomophyceae with 9, Dinophyceae and Cryptophyceae with 4, Zygnemaphyceae with 3 and Chrysophyceae and Xanthophyceae with 1 taxa. In the second section, phytoplankton were of 59 different taxa, and divided into 8 taxanomic groups. The Chlorophyceae was the most common with 21 species, Cyanophyceae with 12, Euglenophyceae with 11, Diatomophyceae with 9, Cryptophyceae and Dinophyceae with 4, Zygnemaphyceae with 2 and Chrysophyceae with 1. Cylindrospermopsis raciborskii was found to be the dominant species and was the highest phytoplankton biovolume throughout the investigation in the both sections.
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