Climate Change and the Rocky Mountains - Impact of Global Changes on Mountains: Responses and Adaptation - page 452

Figure 20.6. Spawning bull trout in the Wigwam River, Canada (Top credit: Joel Sartore).
Bottom: juvenile bull trout and westslope cutthroat trout inhabit a pool in Ole Creek, Glacier
National Park (Credit: Jonny Armstrong).
Color image of this figure appears in the color plate section at the end of the topic.
the species is listed as threatened species under the US Endangered Species
Act and a blue-listed species in Canada. Declines are primarily the result
of habitat degradation, fragmentation, overharvest, non-native invasive
species, and climate change. Having one of the lowest upper thermal limits
and growth optima of all salmonids in North America, the bull trout is
an excellent indicator of warming temperatures and modifi ed hydrologic