Abstract
The phytoplankton of an inshore area of Georgian Bay, Lake Huron, affected by artificial inputs of nutrients in treated sewage effluents from local municipalities, was studied during the ice-free periods of 1973 and 1974. The data are treated as background information prior to implementation of a sewage phosphorus removal programme in 1974-75.Ice-free period mean biomass of total phytoplankton ranged from 1.6 mm3/l in Sturgeon Bay to 6.3 mm3/l in Penetang Bay.Diatoms (Bacillariophyceae) were most important throughout the study area being represented mainly by Stephanodiscus astraea, S. invisitatus, Fragilaria crotonensis, F. capucina, Asterionella formosa, Tabel-laria fenestrata and Rhizosolenia longiseta. The cryptomonad Cryptomonas erosa was very abundant in Penetang Bay and comprised between 20 and 60% of total biomass throughout most of the ice-free periods of both years.Based on relationships between average total phosphorus concentration, total phytoplankton density and species composition in other Great Lakes waters and inland lakes of Ontario, a 50% reduction in total phytoplankton biomass is predicted for Penetang Bay following reduced loading of total phosphorus. Additionally, certain Chrysophyceae may become more important in Penetang Bay in the future.
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Schedule a callMore From: Journal of the American Pharmaceutical Association (1996)
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