Rocky Mountain Research Station Publications

RMRS Online Publication - Journal Articles, External Publications, and Special Reports
Analyzing tradeoffs between the threat of invasion by brook trout and effects of intentional isolation for native westslope cutthroat trout


Peterson, Douglas P.; Rieman, Bruce E.; Dunham, Jason B.; Fausch, Kurt D.; Young, Michael K. 2007. Analyzing tradeoffs between the threat of invasion by brook trout and effects of intentional isolation for native westslope cutthroat trout. In: Carline, R.F.; LoSapio, C., eds. 2007. Sustaining wild trout in a changing world; proceedings of Wild Trout IX symposium; 2007 October 9­12; West Yellowstone, Montana: 51-57.

Native fishes often face simultaneous threats from habitat fragmentation and invasion by nonnative trout. Unfortunately, management actions to address one may create or exacerbate the other. A consistent decision process would include a systematic analysis of when and where intentional use or removal of barriers is most appropriate. We developed a Bayesian belief network (BBN) as a tool for such analyses. We focused on native westslope cutthroat trout (Oncorhynchus clarkii lewisi) and nonnative brook trout (Salvelinus fontinalis). We considered the environmental factors influencing them, their potential interactions, and the effects of isolation on the persistence of local cutthroat trout populations. The tradeoffs between isolation and invasion were strongly influenced by the size and quality of the stream network to be isolated and existing demographic linkages within and among populations. A strength of our approach was that it captured interactions where effects would otherwise difficult to visualize. The model can be used to conduct site-level analysis of barrier management relative to other possible conservation actions, such as habitat improvement or angling restrictions, and to help prioritize actions among streams. By eliciting precise definitions of conservation priorities, the model can also help clarify management objectives and facilitate communication among biologists, managers, and the public.

Keywords: invasive species, brook trout, Salvelinus fontinalis, westslope cutthroat trout, Oncorhynchus clarkii lewisi, Bayesian belief network (BBN)


About PDFs: For best results, do not open the PDF in your Web browser. Right-click on the PDF link to download the PDF file directly to your computer. Click here for more PDF help.


Download Article
http://www.fs.fed.us/rm/pubs_other/rmrs_2007_peterson_d002.pdf

PDF File Size: 75 K


Title: RMRS Other Publications: Analyzing tradeoffs between the threat of invasion by brook trout and effects of intentional isolation for native westslope cutthroat trout
Electronic Publish Date: September 25, 2008
Last Update:
September 25, 2008

RMRS Publications | Order a publication | Contact Us