BLM REA CYR 2013 Extent of Forest Predicted by ALFRESCO for 2015 within Dall Sheep Potential Habitat

Metadata Updated: November 12, 2020

Some of the CYR rasters intentionally do not align or have the same extent. These rasters were not snapped to a common raster per the authors' discretion. Please review selected rasters prior to use. These varying alignments are a result of the use of differing source data sets and all products derived from them. We recommend that users snap or align rasters as best suits their own projects. - Dall sheep habitat choices vary between seasons and are comprised of summer range, winter range, mineral licks, lambing areas, escape terrains and travel routes between these areas. During summer, sheep rely on Dryas spp. dominated meadows with available forage (grasses and forbs) that are close to escape terrain. Predicted increases of shrubification and the encroachment of forests on these Dryas spp. dominated alpine meadows may result in reduced habitat for Dall sheep in the CYR study area. In addition, declines in sheep populations over the past thirty years may be associated with the encroachment of taller shrubs into alpine habitat, which may reduce forage availability and/or support deeper winter snow packs that restrict sheep movements and forage accessibility. Similar results have been found in Kluane National Park, Yukon. To assess future shrubification and treeline advancement throughout the CYR study area, we used the SNAP ALFRESCO model (see CYR REA Report Section C, Abiotic Change Agents) clipped to the current Dall sheep habitat distribution model. Throughout the CYR study area, an increase in shrubification is predicted to occur in 3% of the current Dall sheep habitat distribution. Since females show high site fidelity to summer and lambing areas, shrubification is expected to reduce forage and habitat availability, however, displacement or movements of females to new summer sites may not occur.

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Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) June 15, 2016 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

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Resource Type Dataset
Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) June 15, 2016 (publication)
Responsible Party Alaska Center for Conservation Science, University of Alaska Anchorage (Point of Contact)
Contact Email
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Bbox East Long -137.454105
Bbox North Lat 69.369558
Bbox South Lat 61.998035
Bbox West Long -164.079156
Coupled Resource
Frequency Of Update notPlanned
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Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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