SS3.12 Large Scale Ecosystem Manipulations
Date: Thursday, June 13, 2002
Time: 4:00:00 PM
Location: Carson C
 
PietersR, University of British Columbia, Vancouver, Canada, roger@ocgy.ubc.ca
Lawrence, G, A, University of British Columbia, Vancouver, Canada, lawrence@civil.ubc.ca
 
DAMS AND KOKANEE: NUTRIENT ADDITION AND CIRCULATION IN THE ARROW LAKES RESERVOIR, B.C. (CANADA)
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Nutrient loading and lake circulation are discussed as part of a multidisciplinary fertilization project on the Arrow Lakes Reservoir, British Columbia (Canada). The Arrow Lakes form a long (240 km), deep (300 m) intermontaine reservoir which is part of the Columbia River system and represents one on the largest (465 km2) to undergo experimental fertilization. This project was initiated to restore rapidly declining stocks of kokanee, a land-locked sockeye salmon (Oncorhynchus nerka) and a keystone species of the local ecosystem. The Arrow Lakes have undergone major anthropogenic changes as a result of dams built on (Keenleyside, 1967) and above (Mica, 1973 and Revelstoke, 1983) the system. Phosphorus is retained by the upstream impoundments and has resulted in a reduction in nutrient loading to this naturally oligotrophic system. This and other mechanisms of nutrient reduction (oligotrophication) and changes in lake circulation will be discussed. The productivity response of the system will be discussed in a related presentation (S. HARRIS et al.).