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Keyword: hybridization

Climate, demography, and zoogeography predict introgression thresholds in salmonid hybrid zones in Rocky Mountain streams

Publications Posted on: November 09, 2016
Among the many threats posed by invasions of nonnative species is introgressive hybridization, which can lead to the genomic extinction of native taxa. This phenomenon is regarded as common and perhaps inevitable among native cutthroat trout and introduced rainbow trout in western North America, despite that these taxa naturally co-occur in some locations.

Cutthroat trout-rainbow trout hybridization

Projects Posted on: October 26, 2016
Knowing how environments might influence the degree and location of hybridization between these species represents a potentially powerful tool for managers. To address that need, we modeled how hybridization between westslope cutthroat trout and rainbow trout is influenced by stream characteristics that favor each species. On the Cutthroat trout-rainbow trout hybridization website, we describe that model, and provide high-resolution digital maps in user-friendly formats of the predictions of different levels of hybridization across the native range of westslope cutthroat trout in the Northern Rocky Mountains, representing both current conditions and those associated with warmer stream temperatures. Our goal is to help decision-makers gauge the potential for hybridization between cutthroat trout and rainbow trout when considering management strategies for conserving cutthroat trout.

Headwater streams are resistant to trout hybridization

Science Spotlights Posted on: August 24, 2016
Hybridization between westslope cutthroat trout and both rainbow trout and Yellowstone cutthroat trout is a major conservation concern for the species.  A new broad-scale analysis of hybridization patterns found many pure populations of westslope cutthroat trout in headwaters streams.

Invasive Plants — Issues, Challenges, and Discoveries Webinar Series

Events Posted on: March 15, 2016
The USDA Forest Service Rocky Mountain Research Station hosted a webinar series, Invasive Plants — Issues, Challenges, and Discoveries Webinar Series, to provide attendees with cutting-edge information about invasive plants and their management. This webinar series was sponsored by the Station’s Grassland, Shrubland and Desert Ecosystems Science Program.

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

Publications Posted on: January 12, 2016
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.

Pinus contorta X banksiana hybrids tested in northern Rocky Mountains

Publications Posted on: August 14, 2015
Between 1950 and 1955 hybrid progenies of lodgepole pine (Pinus contorta Dougl.) X jack pine (Pinus banksiana Lamb.) were tested to determine whether adaptation and performance in Montana and Idaho justified improvement of lodgepole pine by hybridization.

The ‘dirt napping’ stem miner: Potential for classical biocontrol of yellow and hybrid toadflax

Projects Posted on: May 11, 2015
Optimizing classical biological control through the deployment of environmentally resilient agents may provide a sustainable, cost-effective and selective management option for large scale infestations of fire adapted weeds. Ongoing research is exploring the efficacy of a candidate agent, the stem mining weevil Mecinus heydenii, for biocontrol for invasive toadflax.

Viability and invasive potential of hybrids between yellow toadflax (Linaria vulgaris) and Dalmatian toadflax (Linaria dalmatica)

Publications Posted on: September 25, 2013
Although outcomes of hybridization are highly variable, it is now considered to play an important role in evolution, speciation, and invasion. Hybridization has recently been confirmed between populations of yellow (or common) toadflax (Linaria vulgaris) and Dalmatian toadflax (Linaria dalmatica) in the Rocky Mountain region of the United States.

Breeding system and interaccessional hybridization of Purshia tridentata plants grown in a common garden

Publications Posted on: August 28, 2012
Purshia spp. (Rosaceae) comprise a widespread western North American species complex that is important as landscape dominants, wildlife habitat, browse for wild and domestic ungulates, and seed reserves for small mammals.

Development and evaluation of 200 novel SNP assays for population genetic studies of westslope cutthroat trout and genetic identification of related taxa

Publications Posted on: August 15, 2012
DNA sequence data were collected and screened for single nucleotide polymorphisms (SNPs) in westslope cutthroat trout (Oncorhynchus clarki lewisi) and also for substitutions that could be used to genetically discriminate rainbow trout (O. mykiss) and cutthroat trout, as well as several cutthroat trout subspecies.

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