The Chemical Water Quality of Lake Nipissing 2003-2004. Andrew Paterson Dorset Environmental Science Centre Environmental Monitoring and Reporting Branch Ontario Ministry of the Environment. Canadian Shield. Ontario’s Inland Lakes. ~260,000 lakes majority on Canadian Shield
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Dorset Environmental Science Centre
Environmental Monitoring and Reporting Branch
Ontario Ministry of the Environment
Ontario’s Inland Lakes
“A lake is the landscape’s most beautiful and expressive feature.
It is earth’s eye; looking into which the beholder measures the depth of [his] own nature.”
- Henry David Thoreau (Walden)
The economic value of good water quality in Ontario
(Multiple sources, 1998, 1999, 2002, 2003: Min. Natural Resources, Provincial Auditor of Ontario, Min. Tourism and Recreation)
Clark, Paterson, DeSellas
& Ingram (2010) 57 pp.
Neary & Clark (1992) 66 pp.
Lake Nipissing and its watershed
Watershed area : Lake area = ~16 : 1
Lake Nipissing showing the 26 stations that were sampled in 1988-90 and re-sampled in 2003-04 (stations 2, 3 and 18 were not re-sampled). Also note that Cache Bay (#7), Callander Bay (#9) and West Bay (#19) are somewhat isolated from the main body of the lake.
We know that the commercial lab values for total phosphorus were generally lower than the MOE Dorset lab results.
Results from a whole-lake experiment conducted at the Experimental Lakes Area, near Kenora, ON in 1973
Carbon & Nitrogen only
Phosphorus is a nutrient that is the limiting factor “controlling” algal growth in aquatic ecosystems
Long-term declines in phosphorus – Dorset A lakes
Average decline in TP = 28%
Large increases in nitrate between 1988-90 and 2003-04
Seasonal nitrate in Callander Bay
Are there any questions?
TN = TKN + NO3 = TIN + TON
TKN = TON + NH4
TON = TN – (NO3 + NH4) = TKN – NH4
TIN = NO3 + NH4
* - significant difference at P<0.05