What estimated percentage of its historical distribution has the bull trout lost?
Answer
More than 70%
The decline in the bull trout's presence across its historical territory in the northwestern United States and Canada has been substantial. Estimates indicate that the species has vanished from more than 70% of the vast areas it once inhabited. This decline has not been uniform; instead, it manifests as a pattern where local populations have disappeared entirely, resulting in a fractured map of remaining fish pockets. These surviving pockets are often separated from each other by unsuitable habitats or impassable physical barriers, such as major road crossings or dams.
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