Abstract
The 203 taxa of plankton algae collected from six Adirondack Mountain lakes of New York are distributed in phyla as follows: Chlorophyta (127), Cyanophyta (45), Chrysophyta (20), Pyrrhophyta (7), Euglenophyta (4). Desmids (73 taxa) compose the largest group within the green algae. The number of taxa in the lakes varies from 87 to 44 and there is no correlation with any measured physical or chemical parameter. Dominants vary between lakes and the common species of dominants are Dinobryon bavaricum, Tabellaria fenestrata, Asterionella formosa, and Anabaena flos-aquae. Occurrence of dominant species in lakes may be influenced by water chemistry and underlying bedrock. A number of plankton species show a preference for one of the two bedrock types in which the lakes lie. Three species (Nephrocytium limneticum, Crucigenia rectangularis, Arthrodesmus phimus) show a high frequency of occurrence in the Adirondack lakes in comparison with other studied areas. Dominant taxa and other indicator species suggest that these lakes are in a mesotrophic stage of evolution.
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