Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 7.
  1. Library Resource
    Articles et Livres
    décembre, 2014

    Native animals are affected differently by urbanization. Some species respond favorably and thrive in human-dominated landscapes, but others are extirpated. Raptors are often sensitive to changes in land cover and prey abundance. We therefore used a combination of broadcast surveys and incidental observations while spot-mapping to evaluate the influences of these two variables on the presence of raptors at 21 sites from 2004–2008 along an urban-to-wildland gradient in western Washington, U.S.A.

  2. Library Resource
    Articles et Livres
    décembre, 2015

    We examined factors that potentially influenced reproductive success in Ferruginous Hawks (Buteo regalis) in the Uintah Basin, Utah, and determined whether oil and gas well development was one of those factors. For three breeding seasons (2002–2004), we measured the number of nestlings, fledglings, and dispersed young that were produced by pairs of Ferruginous Hawks nesting within 2365 km² managed by the Bureau of Land Management.

  3. Library Resource
    Articles et Livres
    décembre, 2015

    Energy and other anthropogenic development are increasing throughout the range of Golden Eagles (Aquila chrysaetos) in western North America, and both private and government agencies have expressed concern about indirect and direct effects on Golden Eagles. To facilitate sustainable development and reduce risk to Golden Eagles, the U.S. Fish and Wildlife Service has established guidelines to assist developers in project planning and siting. A major component of environmental impact assessment is documenting Golden Eagle spatial use near a project site before development.

  4. Library Resource
    Articles et Livres
    décembre, 2013

    The diet of the Eurasian Eagle-Owl (Bubo bubo) was studied in two different land-cover types: wetlands and non-wetlands. We analyzed 1458 prey items obtained from 924 pellets and 534 prey remains collected in 34 territories in west-central Korea. Diet composition differed significantly between the two habitats: diet was mainly birds (68.9% by number; 85.3% by biomass) in wetlands, but was dominated by mammals (38.7% by number; 64.7% by biomass) in non-wetlands.

  5. Library Resource
    Articles et Livres
    décembre, 2014

    Spatially explicit models depicting species occupancy offer a useful conservation tool for land managers. Using occurrence data collected in 2009 and 2010 from the Boise National Forest, Idaho, we developed distribution models for Flammulated Owls (Psiloscops flammeolus) and Northern Saw-whet Owls (Aegolius acadicus) to explore associations between habitat factors and owl occupancy. We then spatially applied these models in a Geographic Information System.

  6. Library Resource
    Articles et Livres
    décembre, 2015
    États-Unis d'Amérique

    The northern Aplomado Falcon (Falco femoralis septentrionalis) inhabited the inland and coastal grasslands of Texas, New Mexico, and Arizona until about 1930, when records of aplomados in the United States decreased. In 1986, the species was classified as endangered under the Endangered Species Act. Among other recovery efforts, 102 birds were released from 2006 through 2011, in its former range in New Mexico at the Armendaris Ranch in the south–central portion of the state. To promote their survival, an extended supplemental feeding program was conducted.

  7. Library Resource
    Articles et Livres
    décembre, 2012

    Little is known about the habitat and ecology of suburban Barred Owls (Strix varia), a species sometimes considered the nocturnal equivalent of Red-shouldered Hawks (Buteo lineatus). We compared nesting habitat of Barred Owls to that of Red-shouldered Hawks nesting in suburban and urban areas, in and near the city of Cincinnati, Ohio, to determine whether any features distinguished owl nest sites from hawk nest sites.

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