Populations of many cold-water species are likely to decline this century with global warming, but declines will vary spatially and some populations will persist even under extreme climate change scenarios. Especially cold habitats could provide important refugia from both future environmental change and invasions by non-native species that prefer warmer waters. The Climate Shield website hosts geospatial data and related information that describes specific locations of cold-water refuge streams for native Cutthroat Trout and Bull Trout across the American West. Forecasts about the locations of refugia could enable the protection of key watersheds, be used to rally support among multiple stakeholders, and provide a foundation for planning climate-smart conservation networks that improve the odds of preserving native trout populations through the 21st century. These data are available for three scenarios: historical (1970–1999), mid-century (2030–2059), and end-of-century (2070–2099).

Climate Shield was inspired by the landscapes of the Rocky Mountains and people everywhere that are working to preserve native trout. The Northern Rockies Adaptation Partnership provided a valuable forum that accelerated this work. The Great Northern and North Pacific Landscape Conservation Cooperatives generously funded the NorWeST project, which serves as the foundation for Climate Shield.

These datasets can be viewed in ArcGIS Online or in the interactive Climate Shield viewer; they are also available from the FSGeodata Clearinghouse, or for individual processing units here.

The Climate Shield story: Turning Conservation on Its Head. NWClimate Magazine 2016.

Presentation Describing Climate Shield: The Cold-Water Climate Shield - Delineating Refugia for Preserving Native Trout

Isaak, Daniel J.; Young, Michael K.; Luce, Charles H.; Hostetler, Steven W.; Wenger, Seth J.; Peterson, Erin E.; Ver Hoef, Jay M.; Groce, Matthew C.; Horan, Dona L.; Nagel, David E. 2016. Slow climate velocities of mountain streams portend their role as refugia for cold-water biodiversity. PNAS. 113(16): 4374-4379.

Isaak, D., M. Young, D. Nagel, D. Horan, and M. Groce. 2015. The cold-water climate shield: Delineating refugia for preserving salmonid fishes through the 21st Century. Global Change Biology. 21:2540-2553.

Wilcox, T.M., M.K. Young, K.S. McKelvey, D.J. Isaak, D.L. Horan, and M.K. Schwartz. 2018. Fine-scale environmental DNA sampling reveals climate-mediated interactions between native and invasive trout species. EcoSphere 9: e02500.

Press Release: Mountain Streams Offer Climate Refuge

High Country News - How to shelter mountain streams in a changing world

Thermal envelopes and climate change - The Climate CIRCulator

Climate Shield Information
Presentations & Publications	Digital Maps & ArcGIS Shapefiles	Fish Data Sources	Trout Distribution Monitoring

	Climate Shield Cold-Water Refuge Streams For Native Trout ArcGIS Online map
Tools Using Climate Shield
	Trout Unlimited Idaho Water Transaction Tool Trout Unlimited developed the Idaho Water Transaction Tool for exploring restoration opportunities related to water diversions and USFS Climate Shield data.  The tool has two components – a data visualization for querying and filtering watershed-scale data summaries across the state of Idaho, and a linked map viewer for exploring source datasets at the scale where projects occur. User's Guide Briefing Paper Idaho Water Transaction Tool

Mike Young
USFS RMRS
Forestry Sciences Lab
800 East Beckwith Avenue
Missoula, MT 59801
Phone: 406-542-3254
Email: michael.k.young@usda.gov

David Nagel
USFS RMRS
Aquatic Sciences Lab
322 E. Front St., Suite 401
Boise, ID 83702
Phone: 208-373-4397
Email: david.nagel@usda.gov