Northern Lakes Recovery Study

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Northern Lakes Recovery Study
Canada / Norway Cooperative Study
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NLRS Objectives (1997 - 2001)

• Method development
• Recovery trends
• Confounding factors
• Future state

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Lumsden Lake
1967-72 University of Toronto Acid Rain
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Decreasing SO4 trend
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Increasing Water pH
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Method Development for Biological Recovery
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A diatom microfossil
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Nordic Netting Procedure - Fish Community
Biodiversity
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Development of Critical Load Models
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Unexpected Findings!!!
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Increasing Water Clarity in Lakes
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El Nino - Extreme Temperature Events
1998
1997
Clear lakes DOC lt2 mg/L
Coloured lakes DOC gt4 mg/L
Snucins and Gunn (2000)
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Biological Effects
Benefits? Smallmouth Bass
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Arrival of Invasive Species
Bythotrephes
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Special Places - Biodiversity Reserve Sites
(Teardrop Lake)