Applied Environmental Research

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Water quality was monitored using phytoplankton, protozoa and benthos as bioindicators in Chadeebhucha Canal, Nakhon Pathom Province. Data was collected during 12 sampling periods at 9 stations, 4 times per month in April, August and December, 2007. Phytoplankton and protozoa were collected at the surface level and a 0.4 m subsurface level. Benthos was collected from bottom sediment in the canal. Phytoplankton collected represented 3 divisions, i.e. Cyanophyta, Chlorophyta and Chromophyta as 4 dominant genera, Oscillatoria, Euglena, Scenedesmus and Phacus, indicating low water quality. Protozoa were found as 2 phyla; i.e. Ciliophora (3 genera) and Sacromastigophora (1 genus), which are characteristic of contaminated water. Benthos collected represented 6 phyla as Arthropoda (Chironomidae as the dominant family), which were bioindicators of low water quality. The remaining organisms collected were Rotifera (4 families), Platyhelminthes, Nematoda, Crustacea and Mollusca (as Filopaludina sp.). Most samples were identified as bioindicators of low water quality at 8 stations in the Chadeebhucha Canal. Exceptions were phytoplankton of the genus Cyclotella sp. and Dinobryon sp. and benthos of the genus Filopaludina sp. found at station 2 (the bridge of Kongboey) and identified as bioindicators of clean water.

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