Seasonal and temperature-related movement of Colorado River cutthroat trout in a low-elevation, Rocky Mountain stream

Seasonal and temperature‐related movement of Colorado River cutthroat trout in a low‐elevation, Rocky Mountain stream

Mobile species will migrate considerable distances to find habitats suitable for meeting life history requirements, and stream-dwelling salmonids are no exception. In April-October 2014, we used radio-telemetry to examine habitat use and movement of 36 Colorado River cutthroat trout Oncorhynchus clarkii pleuriticus (CRCT) in a 14.9-km fragment of Milk Creek, a relatively low-elevation stream in...

Effects of Habitat Area and Complexity on Colorado River Cutthroat Trout Density in Uinta Mountain Streams

—Habitat degradation has reduced the complexity and connectivity of streams on the north slope of the Uinta Mountains in northeastern Utah. These changes have diminished the historical range of Colorado River cutthroat trout Oncorhynchus clarki pleuriticus, isolated the populations of this subspecies, and perhaps increased its risk of extinction. We assessed the effects of fragment area and hab...

Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams

Introgressive hybridization between native and introduced species is a growing conservation concern. For native cutthroat trout and introduced rainbow trout in western North America, this process is thought to lead to the formation of hybrid swarms and the loss of monophyletic evolutionary lineages. Previous studies of this phenomenon, however, indicated that hybrid swarms were rare except when...

Persistence of Colorado River Cutthroat Trout Populations in Isolated Headwater Streams of Wyoming

—For populations of cutthroat trout Oncorhynchus clarkii, isolation in headwater streams may provide protection from invasion by nonnative species but also may enhance a population’s vulnerability to extirpation. We assessed the risk of extirpation for eight Colorado River cutthroat trout O. clarkii pleuriticus populations isolated above water diversion structures in the North Fork Little Snake...

Relations of Geomorphology to Stream Habitat and Trout Standing Stock in Small Rocky Mountain Streams