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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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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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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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Road densities derived from the TIGER data were analyzed to determine the relationship between road density and Bald eagle potential suitable habitat. The quality of a HUC in relation to road density 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 road density by >10 km/km2 = good, 5-10 km/km2 = fair, and 2 = poor.
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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).
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This data release is composed of seven datasets regarding colonial seabirds and forage fish at two seabird nesting colonies on Gull and Chisik Islands in lower Cook Inlet, Alaska. These data were collected to detect changes in the breeding population of Black-legged Kittiwakes and Common Murres on two nesting colonies in lower Cook Inlet and to compare those counts to baseline counts from 1995-1999. They are part of an ongoing study in lower Cook Inlet, Alaska to assess the recent status of forage fish and seabirds (2000-2020).
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To assess the effects of rotenone (fish toxicant) treatment and possible fish removal effects on nesting Osprey (Pandion haliaetus) populations, nests were observed at two reservoirs east of Ashland, Oregon. Hyatt Reservoir was treated with rotenone on October 12, 1989. Howard Prairie was observed as an untreated reference area. Nests at both reservoirs were observed two years pre-treatment (1988, 1989) and two years post-treatment (1990, 1992). The dataset contains Osprey reproductive parameters, foraging parameters, prey delivery rates and bald eagle piracy rates at eight intensively observed nests. Fish stocking records and creel data were obtained from the Oregon Department of Fish & Wildlife for both reservoirs...
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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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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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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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CBR Terrestrial Species Birds Status - Bald Eagle. In addition to current distribution of each bird species, this map shows their current and near-term status within the ecoregion. Current, long-term, and summary bioclimate data is also include for several of these bird species. The input datasets used in the distribution model are also included. These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics...
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In addition to current distribution of each bird species, this map shows their current and near-term status within the ecoregion. Current, long-term, and summary bioclimate data is also include for several of these bird species. The input datasets used in the distribution model are also included. These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users...
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Night roost availability was derived from the NLCD (coniferous 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 roost 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 distance from roosting availability by 2m = poor.


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 Road Density near Bald Eagle suitable habitat (GAP) (Winter) BLM REA NGB 2011 Cumulative Indicator Score for Bald Eagle (Summer) 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 (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) BLM REA NGB 2011 Proximity of Forest Cover to Foraging Habitat (Winter) BLM REA NGB 2011 Proximity to Urban Development for Bald Eagle (Summer) BLM REA MBR 2010 Terrestrial Species Birds Status - Bald Eagle BLM REA CBR 2010 Terrestrial Species Birds Status - Bald Eagle Effects of rotenone on nesting Ospreys (Pandion haliaetus) at Hyatt and Howard Prairie Reservoirs, OR, 1988-1992 Assessing the Status and Trends of Seabirds and Forage Fish in Lower Cook Inlet, Alaska Lead (Pb) in Bald and Golden Eagles from 38 United States, USA, 2010-2018 Predation of Common Murre Eggs at Two Seabird Colonies in Lower Cook Inlet, Alaska Common Murre Disturbance Data on Gull Island, Kachemak Bay, Alaska Assessing the Status and Trends of Seabirds and Forage Fish in Lower Cook Inlet, Alaska Common Murre Disturbance Data on Gull Island, Kachemak Bay, Alaska Predation of Common Murre Eggs at Two Seabird Colonies in Lower Cook Inlet, Alaska Biological and Hydrological Data from the Skagit River Ecosystem, Washington, USA 1968-2016 BLM REA MBR 2010 Terrestrial Species Birds Status - Bald Eagle BLM REA NGB 2011 Road Density near Bald Eagle suitable habitat (GAP) (Winter) BLM REA NGB 2011 Proximity of Forest Cover to Foraging Habitat (Summer) BLM REA NGB 2011 Condition of Perennial Streams and Open Water (Winter) 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 of Forest Cover to Foraging Habitat (Winter) 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 Proximity to Urban Development for Bald Eagle (Summer) BLM REA NGB 2011 Cumulative Indicator Score for Bald Eagle (Winter) BLM REA NGB 2011 Cumulative Indicator Score for Bald Eagle (Summer) BLM REA CBR 2010 Terrestrial Species Birds Status - Bald Eagle Lead (Pb) in Bald and Golden Eagles from 38 United States, USA, 2010-2018