Diatom Flora of the Grand River,Ontario, Canada

Summary This paper describes the diatom flora of the Grand River, Ontario, Canada. Samples were collected systematically from the river over a period of several years at tweleve stations. The diatom flora of the river is typical of temperate alkaline rivers. The flora is rich in species and variaties, and is similar to that from many parts from North Eastern United States. A total of 273 taxa of diatoms were identified. There is a tendency for the number of species per sample to increase downstream. The flora of the estuary in characteristic with a great variety of taxa occuring in small numbers. Most of the species are alkaliphilous and indifferent in the halolian spectra. Part of Ph. D. thesis (1970) of senior author