Relationships between phytoplankton and water quality in Maeklong river
1997
Pusadee Thientaworn
Study on water quality, species and abundance of phytoplankton including the relationships between phytoplankton and water quality in the Maeklong River was conducted from December 1994 to November 1995. The samples were collected every month from 13 stations at the middle depth of the river. Water quality indexes were : water temperature 24.0-31.7 deg C, transparency 13-94 cm, total suspended solid 24-367 mg/l, salinity 0.0-2.8 ppt, pH 7.03-7.65, total hardness 8-153 mg/l, dissolved oxygen 6.02-7.74 mg/l, ammonia 0.0641-0.3626 mg/l, nitrite 0.0063-0.0532 mg/l, nitrate 0.0641-0.3584 mg/l, orthophosphate 0.0060-0.1740 mg/l and chlorophyll a 2.8720-9.4898 mg/l. A total of 66 genera in 6 phyla of phytoplankton recorded comprised of 25 genera of Bacillariophyta, 23 of Chlorophyta, 10 of Cyanophyta, 4 of Pyrrophyta, 3 of Euglenophyta and 1 genera in Chrysophyta. The genera of Diatoma, Surirella, Synedra and Oscillatoria were frequently found in large number. Phylum Cyanophyta was negatively related to temperature and positively to nitrate, Phylum Chlorophyta positively to ammonia and nitrate, Phylum Bacillariophyta negatively to temperature and positively to ammonia, nitrate and chlorophyll a; while those phyla of Chrysophyta, Pyrrophyta and Euglenophyta had no significant relation with any parameters of water quality. The total phytoplankton were negatively related to temperature and positively to ammonia, nitrate and chlorophyll a.
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