Species and Density of Phytoplankton in Area at the Middle Chi River : A Case Study of Maha Sarakham Province

Abstract

Species and density of phytoplankton in the Middle Chi River of Maha Sarakham Province were investigated. The phytoplankton samples were collected at six stations from January 2015 to January 2016, using 20 µm mesh size plankton net. A total of 4 divisions including Chlorophyta (13 genera); Bacillariophyta (12 genera); Cyanophyta (6 genera) and Euglenophyta (5 genera) were found. Chlorophyta was the highest percentage abundance and specie density. Dominant phytoplankton were Scenedesmus sp. and Pediastrum sp. Species and density of phytoplankton were the highest found in December.