Sentences with phrase «westslope cutthroat»

Third, hybridization is spreading upstream in the system via continent — island and stepping - stone invasion, and hybrids have higher straying rates than non-hybridized westslope cutthroat trout, further promoting the spread of hybridization (Boyer et al. 2008).

Circles represent westslope cutthroat trout, rainbow trout and later - generation hybrids, and triangles represent first - generation hybrids.

Here, we used parentage analysis with multilocus microsatellite markers to measure how varying levels of genetic introgression with non-native rainbow trout (Oncorhynchus mykiss) affect reproductive success (number of offspring per adult) of native westslope cutthroat trout (Oncorhynchus clarkii lewisi) in the wild.

Montana's Flathead Basin has long been a spawning haven for the westslope cutthroat trout.

These conditions have likely enhanced rainbow trout spawning and population numbers, leading to massive expansion of hybridization with westslope cutthroat trout.

Genetically pure populations of westslope cutthroat trout are known to occupy less than 10 percent of their historical range.

However, the study noted, over the past 30 years, hybridization rapidly spread upstream, irreversibly reducing the genetic integrity of native westslope cutthroat trout populations.