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Keyword: cutthroat trout

Consistent loss of genetic diversity in isolated cutthroat trout populations independent of habitat size and quality

Publications Posted on: August 29, 2017
Fragmentation and isolation of wildlife populations has reduced genetic diversity worldwide, leaving many populations vulnerable to inbreeding depression and local extinction. Nonetheless, isolation is protecting many native aquatic species from interactions with invasive species, often making reconnection an unrealistic conservation strategy.

Environmental factors found to control trout hybridization

FS News Posted on: November 10, 2016
Anglers and conservationists can rest easier knowing that scientists have just identified ways to locate and preserve genetically pure westslope cutthroat trout populations into the future. A new study released today provides quantitative estimates of which specific environmental factors, such as stream size and temperature, affect the distribution of cutthroat trout and their hybrids with rainbow trout.

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.

Influence of maximum water temperature on occurrence of Lahontan cutthroat trout within streams

Publications Posted on: May 12, 2016
We measured water temperature at 87 sites in six streams in two different years (1998 and 1999) to test for association with the occurrence of Lahontan cutthroat trout Oncorhynchus clarki henshawi. Because laboratory studies suggest that Lahontan cutthroat trout begin to show signs of acute stress at warm (>22°C) temperatures, we focused on the maximum daily temperature.

Combining inferences from models of capture efficiency, detectability, and suitable habitat to classify landscapes for conservation of threatened bull trout

Publications Posted on: May 12, 2016
Effective conservation efforts for at-risk species require knowledge of the locations of existing populations. Species presence can be estimated directly by conducting field-sampling surveys or alternatively by developing predictive models. Direct surveys can be expensive and inefficient, particularly for rare and difficult- to-sample species, and models of species presence may produce biased predictions.

Rainbow and Cutthroat Trout Hybridization

FS News Posted on: January 13, 2016
Scientists at the U.S. Forest Service Rocky Mountain Research Station and National Genomics Center for Wildlife and Fish Conservation announced today in a new paper in the journal Ecology and Evolution that pure cutthroat trout populations are widespread and in fact, there are more pure fish that originally thought.

Estimating valley confinement using DEM data to support cutthroat trout research

Documents and Media Posted on: November 06, 2015
This presentation introduces the Valley Confinement Algorithm (VCA) and describes the importance of valley confinement in estimating habitat for cutthroat trout. Initial applications of the VCA to the Middle Fork Boise River Watershed in Idaho are also discussed. Document Type: Presentations

Spatial variation in spawning habitat of cutthroat trout in a sediment-rich basin

Publications Posted on: May 15, 2015
We examined distribution and habitat characteristics of spawning sites of cutthroat trout Oncorhynchus clarki at various spatial scales to assess effects of sedimentation within a large basin in Montana. Redd density varied widely across the basin; nearly all (99%) of the 362 redds observed occurred in two high-elevation headwater tributaries.

Capture, marking, and enumeration of juvenile bull trout and cutthroat trout in small, low-conductivity streams

Publications Posted on: May 14, 2015
Relative efficiencies of sampling methods were evaluated for bull trout Salvefinus confluentus and cutthroat trout Oncorhynchus clarki in small, high-gradient streams with low conductivities. We compared day and nighttime observations by snorkelers to enumerate bull trout and cutthroat trout, and at night we also used a bank observer.

Cold water as a climate shield to preserve native trout through the 21st Century

Publications Posted on: March 18, 2015
Native trout are culturally and ecologically important, but also likely to undergo widespread declines as the coldwater environments they require continue to shrink in association with global warming.

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