Data from: Differential impacts of human land use on native and non-native fish in mountain watersheds

Human activities increasingly affect cold-water specialists in mountain
ecosystems, both through direct alteration of freshwater habitat and
through indirect effects mediated by terrestrial ecosystem change. Using
presence/absence data for three native and three non-native trout species
in the Alberta Rocky Mountains, Canada, we model the change in occupancy
probability across 20 years (2001 to 2020) in 74 watersheds and relate
occupancy with habitat variables (i.e., elevation, tree coverage, and
density of linear features). Native bull trout showed significant declines
in HUC10 occupancy (-0.16 % year-1) while non-native trout showed
stability. Native trout favoured areas of higher elevation and greater
tree coverage in direct contrast to non-native trout. Bull trout were
significantly negatively impacted by the density of linear features. Our
analysis suggests that regulation of anthropogenic activities and
restoration of the terrestrial environment are required to conserve native
trout in sensitive mountain environments.