Algal Indicators of Trophic Lake Types

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Abstract
The dominant species of algae in the Great Lakes and in the large oligotrophic lakes of western Canada are not those commonly quoted as oligotrophic indicators. It is suggested that this apparent discrepancy may be due to the lack of sufficiently detailed taxonomic information, to the non‐existence of oligotrophic indicators, or to the fact that oligotrophy of these lakes is essentially morphometric rather than edaphic. The utility of phytoplankton quotients and the problem of numbers of species versus dominant species are discussed.