Which introduced species is specifically named as a source of hybridization threat to the bull trout gene pool?
Answer
Brook trout
A significant threat facing bull trout populations, particularly in areas where their range overlaps with introduced fish, is hybridization. Because the bull trout is closely related to other salmonids, it can interbreed with non-native brook trout. The resulting offspring from these pairings are often either sterile or possess reduced fitness compared to pure bull trout. This interbreeding actively dilutes the native gene pool of the bull trout population. Conservation efforts must account for this, especially since anglers sometimes misidentify the protected bull trout when seeking similar-looking species, leading to accidental targeting.
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