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Prey base condition data were extracted from the EPA 303d listing and analyzed to determine the prey base quality within Bald eagle potential suitable habitat. The quality of a HUC in relation to distance to agricultural areas was defined as good (3), fair (2), or poor (1). The score indicates the threat level for each attribute. A low score indicates a low threat, a medium score indicates a medium threat, and a high score indicates a high threat to the species. The values for each score were characterized in relation to impaired waterways. The scale ranged from 1(303d listed) to 3 (non-303d listed) and were averaged by HUC or REA 4km Grid, resulting in a score value range from 1 to 3.
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Nest site and perch locations were derived from the NLCD (all forested cover types) were analyzed to determine the distance from Bald eagle potential suitable habitat. The quality of a HUC in relation to distance to nest site and perch locations was defined as good (3), fair (2), or poor (1). The score indicates the threat level for each attribute. A low score indicates a low threat, a medium score indicates a medium threat, and a high score indicates a high threat to the species. The values for each score were characterized in relation to distance from nest site and perch locations by 2km = poor.
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The overall score was used to contrast the NGB ecoregion to highlight analysis units within bald eagle habitat based on the cumulative indicator score.
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Climate change influences apex predators in complex ways, due to their important trophic position, capacity for resource plasticity, and sensitivity to numerous anthropogenic stressors. Bald eagles, an ecologically and culturally significant apex predator, congregate seasonally in high densities on salmon spawning rivers across the Pacific Northwest. One of the largest eagle concentrations is in the Skagit River watershed, which connects the montane wilderness of North Cascades National Park to the Puget Sound. Using multiple long-term datasets, we evaluated the relationship between local bald eagle abundance, chum and coho salmon availability and phenology, and the number and timing of flood events in the Skagit...
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Foraging habitat extent was derived from National Hydrological Dataset data to determine the extent of Bald eagle potential suitable habitat. The quality of a HUC in relation to habitat was defined as good (3), fair (2), or poor (1). The score indicates the threat level for each attribute. A low score indicates a low threat, a medium score indicates a medium threat, and a high score indicates a high threat to the species. The values for each score were characterized in relation to foraging habitat by open water edge (lake, reservoir); low-gradient perennial stream = good, other aquatic feature (high gradient stream, wetland, spring; non-perennial stream) = fair, and other NHD Type = poor.
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Urban/exurban area data were extracted from GAP landcover data and analyzed to determine the distance from Bald eagle potential suitable habitat. The quality of a HUC in relation to distance to urban/exurban areas was defined as good (3), fair (2), or poor (1). The score indicates the threat level for each attribute. A low score indicates a low threat, a medium score indicates a medium threat, and a high score indicates a high threat to the species. The values for each score were characterized in relation to distance from urban/exurban areas by >15km = good, 6-15km = fair, and
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Waterfowl (prey species) habitat availability was derived from the NWR dataset to characterize the potential quality Bald eagle potential suitable habitat. The quality of a HUC in relation to waterfowl availability was defined as good (3), fair (2), or poor (1). The score indicates the threat level for each attribute. A low score indicates a low threat, a medium score indicates a medium threat, and a high score indicates a high threat to the species. The values for each score were characterized in relation to availability of NWRs adjacent to Bald Eagle habitat through a binary analysis. NWRs present within 2km of a Bald Eagle HUC were rated as good (3), and those outside the 2km range were categorized as poor (1).


map background search result map search result map Biological and Hydrological Data from the Skagit River Ecosystem, Washington, USA 1968-2016 BLM REA NGB 2011 Cumulative Indicator Score for Bald Eagle (Winter) BLM REA NGB 2011 Proximity of Forest Cover to Foraging Habitat (Summer) BLM REA NGB 2011 Proximity to National Wildlife Refuges (Winter) BLM REA NGB 2011 Condition of Perennial Streams and Open Water (Summer) BLM REA NGB 2011 Proximity to Urban Development for Bald Eagle (Winter) BLM REA NGB 2011 Extent of Suitable Habitat for  Bald Eagle (Summer) Biological and Hydrological Data from the Skagit River Ecosystem, Washington, USA 1968-2016 BLM REA NGB 2011 Proximity of Forest Cover to Foraging Habitat (Summer) BLM REA NGB 2011 Condition of Perennial Streams and Open Water (Summer) BLM REA NGB 2011 Extent of Suitable Habitat for  Bald Eagle (Summer) BLM REA NGB 2011 Proximity to National Wildlife Refuges (Winter) BLM REA NGB 2011 Proximity to Urban Development for Bald Eagle (Winter) BLM REA NGB 2011 Cumulative Indicator Score for Bald Eagle (Winter)