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Northern goshawk broadcast surveys: hawk response variables and survey cost. Studies in Avian Biology


Joy, Suzanne M.; Reynolds, Richard T.; Leslie, Douglas G. 1994. Northern goshawk broadcast surveys: hawk response variables and survey cost. Studies in Avian Biology. 16: 24-30.

We examined responses of Northern Goshawks (Accipter gentilis) to taped broadcast calls of conspecifics in tree-harvest areas and around alternate goshawk nests on Kaibab National Forest, Arizona, in 1991 and 1992. Forest areas totaling 476 km2 were systematically surveyed for goshawks. Ninety responses by adult and juvenile goshawks were elicited and 15 active nests were located. No difference in response rates between sexes was detected. Adult males, however, tended to approach the broadcaster without vocalizing, whereas adult females approached while vocalizing. Our success in finding active nests after getting responses from females was greater than after male responses. Goshawks responded more often to broadcasts during the nestling (2.0 responses/100s tations) than fledgling (1.0 responses/100 stations) period. During the fledgling period, adults were more likely to respond to broadcasts than juveniles. Total costs associated with our surveys for goshawks were $58- 82 per km2 and $4.15-5.80 per broadcast station, depending on salaries.

Keywords: Accipiter gentilis, broadcast surveys, Kaibab Plateau, Northern Goshawk, vocalization.


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Title: RMRS Other Publications: Northern goshawk broadcast surveys: hawk response variables and survey cost. Studies in Avian Biology
Electronic Publish Date: October 23, 2006
Last Update:
October 23, 2006

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