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DOI	10.2172/12148
Title	A Population Study of Golden Eagles in the Altamont Pass Wind Resource Area: Population Trend Analysis, 1994-1997
Creator/Author	Predatory Bird Research Group, Long Marine Laboratory
Publication Date	1999 Jul 20
OSTI Identifier	OSTI ID: 12148
Report Number(s)	NREL/SR-500-26092
DOE Contract Number	AC36-99GO10337
DOI	10.2172/12148
Other Number(s)	TRN: US200312%%156
Resource Type	Technical Report
Resource Relation	Other Information: Supercedes report DE00012148; PBD: 20 Jul 1999; PBD: 20 Jul 1999
Coverage	Topical
Research Org	National Renewable Energy Lab., Golden, CO (US)
Sponsoring Org	US Department of Energy (US)
Subject	17 WIND ENERGY; ADULTS; BREEDING; RADIO EQUIPMENT; REPRODUCTION; SIMULATION; TURBINE BLADES; WIND TURBINES; WIND POWER; ENVIRONMENTAL EFFECTS
Related Subject	WIND ENERGY; WIND TURBINES; WIND POWER AND ENVIRONMENTAL EFFECTS
Description/Abstract	The wind industry has annually reported 28-43 turbine blade strike casualties of golden eagles in the Altamont Pass Wind Resource Area, and many more carcasses have doubtless gone unnoticed. Because this species is especially sensitive to adult survival rate changes, we focused upon estimating the demographic trend of the population. In aerial surveys, we monitored survival within a sample of 179 radio-tagged eagles over a four-year period. We also obtained data on territory occupancy and reproduction of about 65 eagle pairs residing in the area. Of 61 recorded deaths of radio-tagged eagles during the four-year investigation, 23 (38%) were caused by wind turbine blade strikes. Additional fatalities were unrecorded because blade strikes sometimes destroy radio transmitters. Annual survival was estimated at 0.7867 (SE=0.0263) for non-territorial eagles and 0.8964 (SE=0.0371) for territorial ones. Annual reproduction was 0.64 (SE=0.08) young per territorial pair (0.25 per female). These parameters were used to estimate population growth rates under different modeling frameworks. At present, there are indications that a reserve of non-breeding adults still exists, i.e., there is an annual territorial reoccupancy rate of 100% and a low incidence (3%) of subadults as members of breeding pairs.
Country of Publication	United States
Language	English
Format	Size: vp.
Availability	INIS; OSTI as DE00012148 To purchase this media from NTIS, click here
System Entry Date	2007 Apr 23
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