Modelling phosphorus in Lake Simcoe and its subcatchments: scenario analysis to assess alternative management strategies

In Lake Simcoe (Ontario, Canada), anthropogenic phosphorus (P) loads have contributed to increased algal growth, low hypolimnetic dissolved oxygen concentrations, and impaired fish reproduction. Management targets to control eutrophication require an ambitious programme to reduce P loads to the lake...

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Veröffentlicht in:Inland waters (Print) 2013-01, Vol.3 (2), p.207-220
Hauptverfasser: Jin, L., Whitehead, P.G., Baulch, H.M., Dillon, P.J., Butterfield, D., Oni, S.K., Futter, M.N., Crossman, J., O'Connor7, E. M.
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container_end_page 220
container_issue 2
container_start_page 207
container_title Inland waters (Print)
container_volume 3
creator Jin, L.
Whitehead, P.G.
Baulch, H.M.
Dillon, P.J.
Butterfield, D.
Oni, S.K.
Futter, M.N.
Crossman, J.
O'Connor7, E. M.
description In Lake Simcoe (Ontario, Canada), anthropogenic phosphorus (P) loads have contributed to increased algal growth, low hypolimnetic dissolved oxygen concentrations, and impaired fish reproduction. Management targets to control eutrophication require an ambitious programme to reduce P loads to the lake. Remediation strategies rely upon an improved understanding of P sources and assessment of the effectiveness of different control options. Here we present an application of the integrated catchment model for phosphorus (INCA-P) to examine P sources across the Lake Simcoe watershed and simulate in-lake P concentrations. This is the first application of INCA-P to a complex watershed of this nature and the first to include a lake component. We evaluated a set of management actions to simulate anticipated effects of P reduction strategies on in-lake total phosphorus (TP) concentrations. The INCA-P scenarios show the difficulty of achieving large-scale reductions from the watershed, given the low rates of P export; however, the study shows that a multifaceted strategy, including fertilizer reduction, addition of buffer strips, more stringent controls on sewage treatment plant effluent, and reduced deposition of P to the lake surface, could achieve a 25% reduction in lake-water TP concentrations and produce TP close to the target of 0.01 mg L −1 .
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subjects Annan biologi
branched river
Freshwater
INCA-P
Lake Simcoe
management practices
Other Biological Topics
phosphorus loading
water quality modelling
title Modelling phosphorus in Lake Simcoe and its subcatchments: scenario analysis to assess alternative management strategies
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