Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Stephen W. Hoffman"'
Autor:
Stephen W. Hoffman
Publikováno v:
The Raptors of Arizona
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15b3bc5596df663402bca1764cd4c3aa
https://doi.org/10.2307/j.ctv21r3jn9.9
https://doi.org/10.2307/j.ctv21r3jn9.9
Autor:
David Brandes, Tara L. Crewe, Stephen W. Hoffman, Laurie J. Goodrich, Neil Paprocki, Dave Oleyar
Publikováno v:
The Condor. 119:98-107
An increasing body of scientific evidence supports the idea that many avian species are changing their migratory behavior as a result of climate change, land-use change, or both. We assessed Red-tailed Hawk (Buteo jamaicensis) population trends in 2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6adbbc02b61044c2f053fdac143dc74a
https://doi.org/10.1650/condor-16-132.1
https://doi.org/10.1650/condor-16-132.1
Autor:
Laurie J. Goodrich, Irving Chávez Domínguez, Gustavo Ramón Lara, Alan Monroy-Ojeda, Elisa Peresbarbosa Rojas, Eduardo Martínez-Leyva, Kashmir Wolf, Stephen W. Hoffman, Rafael Rodríguez Mesa
Publikováno v:
The Wilson Journal of Ornithology. 128:631-637
Extralimital records of birds, including diurnal raptors, are frequently set in localities along migration flyways. Normally, these records pertain to a few individuals that are away from their usual flight routes and found in areas that range from t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0aa75396ea290aa26ac7743c1d7931f
https://doi.org/10.1676/1559-4491-128.3.631
https://doi.org/10.1676/1559-4491-128.3.631
Publikováno v:
ACTA ZOOLÓGICA MEXICANA (N.S.). 26:495-525
Los censos durante la migración han sido utilizados como una herramienta válida para determinar estatus poblacionales de aves rapaces. En Veracruz, México, éstos tienen la posibilidad de generar valiosa información sobre poblaciones a escala reg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb6265e8a1d3de2450ebfad8bd32cb74
https://doi.org/10.21829/azm.2010.263797
https://doi.org/10.21829/azm.2010.263797
Publikováno v:
Bird Conservation International. 20:124-133
Summary Continental-scale bird population estimates are used as a decision-support tool in conservation plans. The calculation of these estimates includes the use of density values and survey data from one or multiple sources extrapolated to the geog
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31f956542648074c53d9aca668602e3b
https://doi.org/10.1017/s0959270909990293
https://doi.org/10.1017/s0959270909990293
Autor:
Stephen W. Hoffman, Jeff P. Smith
Publikováno v:
The Condor. 105:397-419
Trained observers counted migrating raptors and vultures from ridgetops at six sites in the Intermountain and Rocky Mountain Flyways of western North America: Goshute Mountains, Nevada (autumn 1983–2001); Wellsville Mountains, Utah (autumn 1977–1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f536d3f3fb4a89aefa4d2374d4bbcd63
https://doi.org/10.1093/condor/105.3.397
https://doi.org/10.1093/condor/105.3.397
Autor:
Stephen W. Hoffman, John P. DeLong
Publikováno v:
The Condor. 101:674-678
Sharp-shinned Hawks (Accipiter stria tus) and Cooper's Hawks (A. cooperii) showed differ ential migration timing during autumn migration in New Mexico and Nevada. Age-sex classes passed through both sites in this order: juvenite females, juvenile mal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b72e676d94456c61fa5621e05aabc707
https://doi.org/10.2307/1370199
https://doi.org/10.2307/1370199
Autor:
Stephen W. Hoffman, Jeff P. Smith
Publikováno v:
The Condor. 107:473-475
In Hoffman and Smith (2003), we summarized two decades of raptor migration count data from western North America. McCaffery and McIntyre (2005) offer an extensive critique of the “conclusions” we drew from these data concerning the migration ecol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::732281d4ad41f3b7f095f600f8e0221c
https://doi.org/10.1093/condor/107.2.473
https://doi.org/10.1093/condor/107.2.473
Publikováno v:
The Condor. 98:633-636
In this report we describe three behavioral phenomena of Golden Eagle (Aquila chrysaetos) fall migration: agespecific seasonal differential migration, age-specific diel patterns of migration, and the spatial dispersion pattern of migrating Golden Eag
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3eff89970e65b73aa446a3b14ea3625
https://doi.org/10.2307/1369577
https://doi.org/10.2307/1369577
Publikováno v:
The Southwestern Naturalist. 37:188
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f500e5175246c5c9a4c7563f1ecfcf6
https://doi.org/10.2307/3671667
https://doi.org/10.2307/3671667