Phytoplankton composition of a small subarctic lake in the Northwest Territories, Canada

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Abstract
Eighty-one common taxa were identified from a subarctic lake near Norman Wells, N.W.T., during the summers of 1972 and 1973. Many of these organisms were ephemeral in distribution. The Diatomeae, Chlorophyta and Cyanophyta accounted for 84% of the total taxa and the dominating morphological forms were nonmotile unicells and colonies. Comparing these results with other subarctic and arctic lakes it seems that the diversity of taxonomic groups and morphological forms is not restricted by increasing latitudes. The ratio of net plankton-to-nanoplankton was 0·72 with the largest nanoplanktonic group being the 21–40 μm size category. Based on species composition (31% of the species indicating eutrophy), phytoplankton quotients, such as the Myxophycean, Chlorophycean and Compound Quotients, along with the high nutrient levels, it Was postulated that the lake was possibly eutrophic.

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