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Biological survey of Lake St. John 1966-1967

Show simple item record German, M. J.
dc.coverage.spatial Lake St. John
dc.coverage.spatial Ontario 2019-03-08T16:19:21Z 2019-03-08T16:19:21Z 1968 1968-05
dc.description.abstract In September of 1966, a general biological survey of Lake St. John was carried out to determine the pollution status of the lake. This information indicated that the lake was not grossly altered by waste discharges from Chemical Developments of Canada Limited; however, toxic conditions were evident at the sampling site most proximal to the chemical plant. A more intensive sampling programme was undertaken in September of 1967 in order to define the zone of toxic pollution. Both chemical and biological parameters indicated a graduation of water quality extending outward from the main discharge. The zone of toxic pollution established by biological parameters extended 600 feet east, 600 feet north-east and 900 feet north of the main effluent outlet. The blue-green algae Anabaena and Aphanizomenon were present in extremely high numbers in Lake St. John. Both these forms of algae are capable of collecting in large masses sufficient to form algae blooms. Nutrients present in the surface water of the lake were sufficient to foster high algae populations.
dc.format pdf
dc.language.iso en
dc.publisher Ontario Ministry of the Environment
dc.rights Queen's Printer for Ontario, Crown Copyright, Non-Commercial Use Permitted
dc.subject water quality
dc.subject biological survey
dc.subject pollution
dc.subject waste discharge
dc.subject algae
dc.subject algae blooms
dc.subject nutrients
dc.subject water chemistry
dc.subject phytoplankton
dc.subject bottom fauna
dc.title Biological survey of Lake St. John 1966-1967
dc.type Report
dc.rights.holder Queen's Printer for Ontario
dc.contributor.affiliation Biology Branch, Ontario Water Resources Commission

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