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An improved environmental DNA assay for bull trout (Salvelinus confluentus) based on the ribosomal internal transcribed spacer I

Publications Posted on: November 29, 2018
The majority of environmental DNA (eDNA) assays for vertebrate species are based on commonly analyzed regions of the mitochondrial genome. However, the high degree of mitochondrial similarity between two species of charr (Salvelinus spp.), southern Dolly Varden (S. malma lordii) and bull trout (Salvelinus confluentus), precludes the development of a mitochondrial eDNA assay to distinguish them.

Species occurrence data from the Range-Wide Bull Trout eDNA Project

Datasets Posted on: March 15, 2018
The bull trout is an ESA-listed species with a historical range that encompasses many waters across the Northwest. Though once abundant, bull trout have declined in many locations and are at risk from a changing climate, nonnative species, and habitat degradation.

Fine-scale characteristics of fluvial bull trout redds and adjacent sites in Rapid River, Idaho, 1993-2007

Publications Posted on: June 22, 2017
From 1993 to 2007, we used single pass, September surveys to locate and measure fluvial bull trout (Salvelinus confluentus) redds in Rapid River, Idaho. Here we describe substrate sizes, redd dimensions, and water depths, velocities, and temperatures within and adjacent to 337 redds. Most (79%) spawning sites had fewer than 20% surface fines ( 60%) in redds.

Climate change, fish, and aquatic habitat in the Blue Mountains [Chapter 5]

Publications Posted on: April 27, 2017
National Forest System lands in the Blue Mountains region support a diversity of important native aquatic species that will be affected by climate change. As part of the Blue Mountains Adaptation Partnership, four of these species (spring Chinook salmon (Oncorhynchus tshawytscha Walbaum in Artedi), bull trout (Salvelinus confluentus Suckley), summer steelhead (O. mykiss Walbaum), and interior redband trout (O. m.

Development of bull trout sampling efficiency models

Publications Posted on: May 12, 2016
This report describes results of research conducted in Washington State in 2002 through Interagency Agreement #134100-2-H001 between the U.S. Fish and Wildlife Service (USFWS) and the U.S. Forest Service Rocky Mountain Station (RMRS). This project was a collaborative effort between the USFWS, RMRS, the Washington Department of Fisheries and Wildlife (WDFW), and the U.S. Geological Survey, Biological Resources Division (USGS-BRD).

Influences of temperature and environmental variables on the distribution of bull trout within streams at the southern margin of its range

Publications Posted on: May 12, 2016
The bull trout Salvelinus confluentus is believed to be among the most thermally sensitive species in coldwater habitats in western North America. We conducted a comprehensive field assessment of thermal habitat associations throughout the southern margin of the species' range. We developed models of thermal habitat associations using two data sets representing a geographically diverse range of sites and sampling methods.

Local-Habitat, Watershed, and Biotic Features Associated with Bull Trout Occurrence in Montana Streams

Publications Posted on: May 12, 2016
We evaluated the association of local-habitat features, large-scale watershed factors, the presence of nonnative brook trout Salvelinus fontinalis, and connectivity to neighboring populations with patterns of occurrence of threatened bull trout S. confluentus in 112 first-order to fourthorder streams in the Bitterroot River drainage in western Montana.

An evaluation of multipass electrofishing for estimating the abundance of stream-dwelling salmonids

Publications Posted on: May 12, 2016
Failure to estimate capture efficiency, defined as the probability of capturing individual fish, can introduce a systematic error or bias into estimates of fish abundance.

New Genetic Tool Highlights Bull Trout Distribution

FS News Posted on: February 09, 2016
FOR IMMEDIATE RELEASE   New Genetic Tool Highlights Bull Trout Distribution  

The range-wide bull trout eDNA project

Projects Posted on: February 04, 2016
The bull trout has a historical range that encompasses many waters across the Northwest. Though once abundant, bull trout have declined in many locations and is now federally listed and protected under the Endangered Species Act. Rocky Mountain Research Station scientists initiated the range-wide bull trout eDNA project in partnership with biologists from more than 20 organizations to create sound and precise information about the distribution of bull trout in thousands of streams across their range.

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