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Montana Ecological Services Field Office

585 Shepard Way, Suite 1 Helena, Montana 59601 406-449-5225 (FAX) 406-449-5339

 

 

Fisheries Applied Research and Technical Assistance

 

Helena Field Office

 

Influence of habitat size and time since isolation on persistence of westslope cutthroat trout in isolated stream networks

Westslope cutthroat trout, Idaho

Westslope cutthroat trout, Idaho.

 

 

Our objective is to use a combination of found and new data to develop a predictive model for presence of westslope cutthroat trout in isolated stream networks in the northern Rocky Mountains as a function of time since isolation and habitat size.  The intent is to produce an empirically-based tool for managers to refine evaluations of barriers and isolation management options for the species.

 Preliminary results were presented at the 2008 Annual Meeting of the Western Division of the American Fisheries Society, in Portland, OR.  Final analysis of the dataset is ongoing with an expected completion date of winter 2009-2010.

 

INVESTIGATORS:  Dr. Doug Peterson (USFWS), Dr. Bruce Rieman (USFS-Retired), Dona Horan (USFS-Rocky Mountain Research Station).

FUNDING:  Region 1 US Forest Service

 

Perched culvert at road crossing in Idaho-Panhandle National Forest

 

Perched culvert at road crossing in Idaho-Panhandle National Forest.  An assessment of road crossings across Region 1 of the US Forest Service concluded that nearly 80% of existing culverts are partial or total upstream fish passage barriers (Hendrickson et al. 2008).

 

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Updated 9/8/09