THE EARLY DEVELOPMENT OF A BOTTOM FAUNA IN A NEW POWER RESERVOIR IN THE ROCKY MOUNTAINS OF ALBERTA

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Abstract
The Barrier reservoir, Alberta, was examined periodically from May, 1947, shortly after water impoundment began, until June 1949. The reservoir is fundamentally oligotrophic; rapid replacement of water, periodic fluctuation of the water level, and a marked annual deposition of sediment contribute to this condition. The bottom fauna, consisting chiefly of immature Chironomidae, was much influenced by these factors during the period of the investigation. A Pentapedilum–Chironomus–Tanytarsus succession is interpreted as indicating a change from original eutrophic conditions on the bottom to oligotrophic, as the rich leaf litter of the original bottom was lost under sediments.

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