Effective Population Size and Connectivity of Bull Trout in the Imnaha River Subbasin 2007 Annual Report

Effective Population Size and Connectivity of Bull Trout in the Imnaha River Subbasin 2007 Annual Report
2007_NEO_BT_Annual_Report.pdf1.34 MB

Bull trout (Salvelinus confluentus) were listed range wide as a threatened species on

November 1, 1999 (USFWS 1999). Previously, the Columbia River distinct population segment

(DPS) of bull trout had been listed as threatened since June 10, 1998. Factors contributing to the

listing of bull trout include range wide declines in distribution, abundance and habitat quality.

Land and water uses that alter or disrupt habitat requirements of bull trout can threaten the

persistence of the species. Examples of such activities include: water diversions, dams, timber

extraction, mining, grazing, agriculture, nonnative fish competition and/or hybridization,

poaching, past fish eradication projects, and channelization of streams. These threats are

prevalent throughout the Columbia River basin (USFWS 2000, 2002).

Author(s)
Image
Grayscale U.S. Fish and Wildlife Service logo
Natural Resources Biologist
Fish and Aquatic Conservation,
Science Applications
Additional Role(s)
Science of the Service Planning Team ,
FAC Representative for Regional Bull Trout Advisory Group ,
Associate Editor for Northwest Science,
Affiliate Professor at Portland State University
Vancouver,WA
Justin Cook
Publication date
Type of document
Report
Facility
Coho Salmon eggs incubating and hatching at Quilcene NFH in WA State.
Columbia River Fish and Wildlife Conservation Office
The Columbia River Fish and Wildlife Conservation Office collaborates with local, state and Tribal partners to conserve, restore, and improve native fish and aquatic resources throughout Oregon and along the Columbia River. We study wild and hatchery aquatic organisms and their populations, support...
Conservation Office
Vancouver,WA
Program
A man is fishing in a boat with three young girls. The kids are excitedly pulling a fish out of the water.
Healthy fisheries and waters are the foundation of America’s outdoor traditions and give us the freedom to fish, boat, and enjoy the benefits of outdoor recreation. The Fish and Aquatic Conservation programs work with states, tribes, and communities to provide a comprehensive approach to freshwater...
Program
Falls Church,VA
Species
Bull trout and kokanee salmon underwater

Bull trout (Salvelinus confluentus) are members of the family Salmonidae and are char native Washington, Oregon, Idaho, Nevada, Montana and western Canada. Compared to other salmonids, bull trout have more specific habitat requirements that appear to influence their distribution and abundance....

FWS Focus
Species
Kingdom
Animalia
Taxonomic Rank
Species
Ecosystem
River/stream
FWS and DOI Region(s)
Pacific