Adaptive Management in the Namakan Reservoir: Effects on Walleye Spawning Habitat

The most recent water level management policy (rule-curve) in the Namakan Reservoir was established in 2000 by the International Joint Commission and was intended to strike a balance between benefits to plants and animals in the reservoir and human water needs (e.g., hydroelectric power generation, recreation, and navigation). Walleye (Sander vitreus) are prevalent in the reservoir, sensitive to water levels, and ecologically, culturally, and economically important, making them an excellent species for studying the effects of rule-curves. To compare the effects of two rule-curves (1970-2000 and 2000-present), I used spatial modeling to estimate seasonal habitat availability at various sites within the reservoir. The overall objective of the study was to determine if the most recent rule-curve has improved spawning habitat availability for walleye.