() Toxicity investigations on a pit-lake in Northwestern Ontario, Canada.

Goold, A. 1, Lee, P.1, 1 Department of Biology, Lakehead University, Thunder Bay, Ontario, Canada

ABSTRACT- Investigations are continuing on the cause of toxicity in Hogarth Pit-Lake near Atikokan, Ontario, Canada. This lake is nearly devoid of life versus the nearby Caland Pit-Lake which has an active aquaculture operation in the upper levels of this meromictic lake. Detailed chemical analyses showed that Hograth Pit-Lake was high in sulfates but did not have elevated levels of heavy metals in its near neutral water column. However, seeps entering Hogarth had varied water quality. Standard LC50 tests have revealed that the main water body of the pit-lake is not acutely toxic but the paucity of life suggested a chronic problem. Detailed TIE analyses using a chronic indicator for toxicity are continuing to isolate the most likely cause(s) of restricting the development of a normal food chain in Hogarth. The research is critical since eventually Hogarth will join with Caland and overflow into downstream waters.

Key words: Pit-lakes, Toxicity Indicator Evaluation (TIE), Mining effects, Meromictic

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