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Seasonal st.ndies concentrating upon physical aiid chemical parameters and the epilithic algal community were conducted a t specific sites in five tributary rivers flowing through the oil sands region of northeastern Alberta, Canada into the Athabasca River. d d a v u t a , Cornphonema olivaceuni. Nitzschia fonticola, Nitzschia p l e a , Synedra rumpens, and Synedra ulna).One exception was the Hangingstone River where chlorophycean algae (Stigeocloni,utn pachyderm,um and Clrtdophora, glornemta) were next in importance to the cyanophytes. Seasonal fluctuations in algal species and numbers were influenced by a myriad of int,eracting parameters. Physically disruptive forces (current velocit,y and discharge) appeared more important than dissolved nutrients. They were also responsible for affecting the chemical composition of the water itself.

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