Winter movement and habitat use of Northern Goshawks breeding in Utah. Underwood, J., White, C., M., & Rodriguez, R., L. Studies in Avian Biology, 31(31):228-238, 2006. abstract bibtex Few studies detail population-wide winter movements of Northern Goshawks (Accipiter gentilis) in North America or examine their winter ecology and habitat associations. Using satellite-telemetry transmitters, landscape-habitat models, aerial photos, and field sampling, we assessed movements and wintering habitats of goshawks breeding in Utah. In our study, 42 adult females were fitted with 30 g or 32 g platform transmitter terminals (PTT) between 2000 and 2003. Our data suggest that females in the populations studied were either migrants or semi-migrants that moved randomly throughout the state or residents. Resident birds remained in the general area around the breeding territory but used a wider variety of habitat cover types and commonly moved downward in elevation during winter. In contrast, birds that migrated or semi-migrated from their breeding territories for the winter generally used the pinyon-juniper habitat cover type. This pinyon-juniper habitat tended to be a mosaic of fairly open pinyon-juniper forest and sagebrush ecotones. The wintering areas for each bird were analyzed using vegetative sampling methods in order to determine correlations between habitat structure and goshawk use. Vegetative structure in the winter areas varied widely, but all goshawks used areas of forest-non-forest edge throughout the winter. Many of the selected winter sites showed signs of human manipulation (tree harvest, tree and brush removal by chaining, or fire). These findings increase our understanding of what constitutes goshawk wintering habitat and place new priority on understanding the use of various habitat cover types by wintering Northern Goshawks.
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title = {Winter movement and habitat use of Northern Goshawks breeding in Utah},
type = {article},
year = {2006},
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pages = {228-238},
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abstract = {Few studies detail population-wide winter movements of Northern Goshawks (Accipiter gentilis) in North America or examine their winter ecology and habitat associations. Using satellite-telemetry transmitters, landscape-habitat models, aerial photos, and field sampling, we assessed movements and wintering habitats of goshawks breeding in Utah. In our study, 42 adult females were fitted with 30 g or 32 g platform transmitter terminals (PTT) between 2000 and 2003. Our data suggest that females in the populations studied were either migrants or semi-migrants that moved randomly throughout the state or residents. Resident birds remained in the general area around the breeding territory but used a wider variety of habitat cover types and commonly moved downward in elevation during winter. In contrast, birds that migrated or semi-migrated from their breeding territories for the winter generally used the pinyon-juniper habitat cover type. This pinyon-juniper habitat tended to be a mosaic of fairly open pinyon-juniper forest and sagebrush ecotones. The wintering areas for each bird were analyzed using vegetative sampling methods in order to determine correlations between habitat structure and goshawk use. Vegetative structure in the winter areas varied widely, but all goshawks used areas of forest-non-forest edge throughout the winter. Many of the selected winter sites showed signs of human manipulation (tree harvest, tree and brush removal by chaining, or fire). These findings increase our understanding of what constitutes goshawk wintering habitat and place new priority on understanding the use of various habitat cover types by wintering Northern Goshawks.},
bibtype = {article},
author = {Underwood, Jared and White, Clayton M and Rodriguez, Ronald L},
journal = {Studies in Avian Biology},
number = {31}
}
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Using satellite-telemetry transmitters, landscape-habitat models, aerial photos, and field sampling, we assessed movements and wintering habitats of goshawks breeding in Utah. In our study, 42 adult females were fitted with 30 g or 32 g platform transmitter terminals (PTT) between 2000 and 2003. Our data suggest that females in the populations studied were either migrants or semi-migrants that moved randomly throughout the state or residents. Resident birds remained in the general area around the breeding territory but used a wider variety of habitat cover types and commonly moved downward in elevation during winter. In contrast, birds that migrated or semi-migrated from their breeding territories for the winter generally used the pinyon-juniper habitat cover type. This pinyon-juniper habitat tended to be a mosaic of fairly open pinyon-juniper forest and sagebrush ecotones. The wintering areas for each bird were analyzed using vegetative sampling methods in order to determine correlations between habitat structure and goshawk use. Vegetative structure in the winter areas varied widely, but all goshawks used areas of forest-non-forest edge throughout the winter. Many of the selected winter sites showed signs of human manipulation (tree harvest, tree and brush removal by chaining, or fire). 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