Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (300 K bytes)

Title: Population Genetics of Boise Basin Bull Trout (Salvelinus confluentus)

Author: Whiteley, A.R.; Spruell, P.; Allendorf, F.W.;

Date: 2003

Source: Final report. RMRS# 00-JV-1122014-561. 37pp.

Publication Series: Miscellaneous Publication

Description: We analyzed the population genetic structure of bull trout (Salvelinus confluentus) in the Boise River Basin, Idaho. We determined the influence of contemporary (including anthropogenic) and historic factors on genetic structure, taking into accountexisting data on bull trout habitat patches in this basin. We tested three models of the organization of genetic structure in this system, where genetic structure would: a) parallel the stream hierarchy, b) correspond to habitat patch structure, or c) follow a pattern of isolation by distance. We found strongest support for the isolation by distance model. In addition, we found weak population differentiation within the Boise system (FST = 0.064), relative to other similarly scaled systems containing bull trout. Frequent disturbance may be responsible for the strong isolation by distance yet weak overall levels of population subdivision in this system. In addition, we found that the South Fork was a genetic outlier from the remainder of the Boise system and may have been colonized at a separate time than the Middle and North Forks. At least one dam (Kirby Dam) has noticeably reduced levels of gene flow. These results show that distinct patterns of genetic structure may occur in separate portions of a species' range, especially at the range extremes. Based on these results, we suggest the South Fork should be treated separately from the remainder of the basin. Bull trout in Mores Creek should be protected but our results suggest that this population may be comprised of adults entrained by Arrowrock Dam and unable to return to natal streams to spawn and are thus spawning in the only available habitat. Connectivity should be restored whenever possible in cases where human activities have eliminated migratory corridors.

Keywords: population genetics, Boise Basin bull trout, Salvelinus confluentus, habitat patches, genetic structure, weak population differentiation

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)



Whiteley, A.R., P. Spruell and F.W. Allendorf 2003. Population Genetics of Boise Basin Bull Trout (Salvelinus confluentus). Final report. RMRS# 00-JV-1122014-561. 37pp.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.