Chanit khong sarai namchut nai boriwen Thale-Noi.
1987
Puangnit Keowsurat | Pimpan Tansakul
A survey of freshwater algae was conducted at 10 stations in Thale-Noi Lake from June, 1984 to March, 1985. A total of 252 algal species were identified. The maximum number of species and abundance of dominant species were found in the dry season, with a peak in June, while both decreased in the rainy season to a minimum in December. Arthrodesmus subulatus was the dominant species in June and September. Hyalotheca mucosa dominated in December and was succeeded by Cosmarium constractum var. minutum in March. These variations in the algal population were associated with changes in certain physico-chemical parameters of the water. Water temperature seemed to have little influence on species composition and density of dominant species. However, transparency, turbidity, conductivity, pH and dissolved oxygen were relative high in dry season at the time of maximum number of species and abundance of dominant species and dropped during the rainy season as the abundance of algae decreased. The values on these parameters appear to be determined mainly by the seasonal variation in the amount of rainfall.
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