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Keyword: cutthroat trout

Ultrasound imaging identifies life history variation in resident cutthroat trout

Science Spotlights Posted on: July 19, 2021
We tested the use of ultrasound imaging to nonlethally assess the maturity of resident westslope cutthroat trout. Through this work, we observed the smallest mature female ever documented for this species. 

Nonlinear response of trout abundance to summer stream temperatures across a thermally diverse montane landscape

Publications Posted on: March 12, 2020
Stream temperature is a fundamental physical factor that affects the distribution and abundance of salmonids, but empirical inconsistencies exist regarding the nature of this relationship in wild populations.

Landscape attributes and life history variability shape genetic structure of trout populations in a stream network

Publications Posted on: March 04, 2020
Spatial and temporal landscape patterns have long been recognized to influence biological processes, but these processes often operate at scales that are difficult to study by conventional means. Inferences from genetic markers can overcome some of these limitations.

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