Ecological studies on yeasts in the St. Lawrence River

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Abstract
The total numbers of yeasts, bacteria, and coliforms found at five stations in the St. Lawrence River, sampled during a 5-month period in the summer of 1968, were compared to temperature, depth, biological oxygen demand (BOD), dissolved oxygen (DO), and salinity. Averaged data indicate some relationships exist among the biological and physical parameters but examination of the data for the individual samples do not lead to the same conclusions. However, the large increase in numbers of Rhodotorula glutinis (the dominant species of the 'pink yeasts') was found to follow the decrease in bacterial numbers, both total count and coliforms, after the introduction of sewage pollution. The metabolic characteristics of these 'pink yeasts,' allowing them to show such rapid increases in numbers, are not known.

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