Which major river systems historically encompassed the bull trout's massive distribution west of the Continental Divide in North America?
Answer
Columbia, Fraser, Snake, and Klamath basins
The historical range of the bull trout was extensive, covering the Pacific Slope drainages situated west of the Continental Divide across both the United States and Canada. This vast territory was defined by several major, interconnected river systems that provided the cold-water habitats necessary for their survival. Specifically, the text identifies the Columbia, Fraser, Snake, and Klamath basins as encompassing the areas where these fish were distributed, extending through regions including southern British Columbia, Washington, Oregon, Idaho, and western Montana. The presence of bull trout historically signified a high degree of aquatic ecosystem health across these specific drainages.
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