Analyse ecologique du phytoplancton de trois lacs des Laurentides (Quebec, Canada)

Water and phytoplankton samplings were taken in three little Laurentide lakes from July 4, 1972, to October 29, 1973. Of the 111 species identified, 66 are found in Lake Triton (maximum depth 3 m, pH 6.8, conductivity 30 μmhos/cm; 1 mho = 1 S), 62 in Lake Geai (6 m, pH 5.8, 22 μmhos/cm) and 47 in Lake Croche (8 m, pH 6.5, 25 μmhos/cm). The greatest number of species belong to Diatoms and Desmidiaceae. However, the most numerous algae are Chrysophyceae, at least in some months of the year in the three lakes, and Cyanophyceae in Lake Geai.