Role of Demographic, Genetic, and Environmental Factors Influencing the Spread of Hybridization Between Native Westslope Cutthroat and Non-Native Rainbow Trout

Publisher: USGS | Science Center: Northern Rocky Mountain Science Center (NRMSC, Bozeman) | Format: URL

nrmsc.usgs.gov — This research project examines dispersal and several components of fitness between hybrids and non-hybridized fish. Further, scientists will examine the relationship between environmental factors and genetic and demographic characteristics of hybrid populations. The specific objectives are: (1) to compare the spawning dynamics and dispersal More... This research project examines dispersal and several components of fitness between hybrids and non-hybridized fish. Further, scientists will examine the relationship between environmental factors and genetic and demographic characteristics of hybrid populations. The specific objectives are: (1) to compare the spawning dynamics and dispersal patterns of WCT, RBT, and hybrid trout in the upper Flathead River system; (2) to quantify the reproductive success and survival of WCT, RBT and hybrid trout using pedigree analysis based on microsatellite DNA markers in two recently invaded streams; and (3) to assess the environmental and ecological factors influencing the spatial and temporal distribution and abundance of hybridization in the upper Flathead River drainage, Montana and Canada. Results will be used to inform conservation and management programs for recovery of cutthroat trout. Less...