A population study of golden eagles in the Altamont Pass Wind Resource area. Second-year progress report
Since January 1994, the Predatory Bird Research Group, University of California, Santa Cruz, has been conducting a field investigation of the ecology of golden eagles (Aquila chrysaetos) in the vicinity of the Altamont Pass Wind Resource Area (WRA). The 190 km{sup 2} facility lies just east of San F...
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National Renewable Energy Laboratory (U.S.)
1997
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ftunivnotexas:info:ark/67531/metadc691747 2023-05-15T18:49:23+02:00 A population study of golden eagles in the Altamont Pass Wind Resource area. Second-year progress report United States. Department of Energy. Office of Energy Efficiency and Renewable Energy. 1997-07-01 99 p. Text https://doi.org/10.2172/531111 http://digital.library.unt.edu/ark:/67531/metadc691747/ English eng National Renewable Energy Laboratory (U.S.) other: DE97008701 rep-no: NREL/SR--440-23087 grantno: AC36-83CH10093 doi:10.2172/531111 osti: 531111 http://digital.library.unt.edu/ark:/67531/metadc691747/ ark: ark:/67531/metadc691747 Other Information: PBD: Jul 1997 Health Hazards Wind Energy-Environmental Impacts Wind Turbines Habitat Altamont Pass Avian Interactions Environmental Effects Wind Energy-Environmental Impacts Golden Eagles 17 Wind Energy Mortality Birds Report 1997 ftunivnotexas https://doi.org/10.2172/531111 2016-04-02T22:11:25Z Since January 1994, the Predatory Bird Research Group, University of California, Santa Cruz, has been conducting a field investigation of the ecology of golden eagles (Aquila chrysaetos) in the vicinity of the Altamont Pass Wind Resource Area (WRA). The 190 km{sup 2} facility lies just east of San Francisco Bay in California and contains about 6,500 wind turbines. Grassland and oak savanna habitats surrounding the WRA support a substantial resident population of golden eagles. Each year, the U.S. Fish and Wildlife Service receivers reports from the wind industry of about 30 golden eagle casualties occurring at the WRA, and it is probable that many more carcasses go unnoticed. Over 90 percent of the casualties are attributed to collisions with wind turbines. The main purpose of this study is to estimate the effect of turbine-related mortality on the golden eagle population of the area. Assessing the impact of the WRA kills on the population requires quantification of both survival and reproduction. To estimate survival rates of both territorial and non-territorial golden eagles, we tagged 179 individuals with radio-telemetry transmitters expected to function for about four years and equipped with mortality sensors. Population segments represented in the tagged sample include 79 juveniles, 45 subadults, 17n floaters (non-territorial adults), and 38 breeders. Effective sample sizes in the older segments increase as younger eagles mature or become territorial. Since the beginning of the study, we have conducted weekly roll-call surveys by airplane to locate the tagged eagles in relation to the WRA and to monitor their survival. The surveyed area extends from the Oakland Hills southeast through the Diablo Mountain Range to San Luis Reservoir about 75 km southeast of the WRA. The surveys show that breeding eagles rarely enter the WRA while the non-territorial eagles tend to move about freely throughout the study area and often visit the WRA. Report Aquila chrysaetos golden eagle University of North Texas: UNT Digital Library Diablo ENVELOPE(-57.289,-57.289,-63.799,-63.799) |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Health Hazards Wind Energy-Environmental Impacts Wind Turbines Habitat Altamont Pass Avian Interactions Environmental Effects Wind Energy-Environmental Impacts Golden Eagles 17 Wind Energy Mortality Birds |
spellingShingle |
Health Hazards Wind Energy-Environmental Impacts Wind Turbines Habitat Altamont Pass Avian Interactions Environmental Effects Wind Energy-Environmental Impacts Golden Eagles 17 Wind Energy Mortality Birds A population study of golden eagles in the Altamont Pass Wind Resource area. Second-year progress report |
topic_facet |
Health Hazards Wind Energy-Environmental Impacts Wind Turbines Habitat Altamont Pass Avian Interactions Environmental Effects Wind Energy-Environmental Impacts Golden Eagles 17 Wind Energy Mortality Birds |
description |
Since January 1994, the Predatory Bird Research Group, University of California, Santa Cruz, has been conducting a field investigation of the ecology of golden eagles (Aquila chrysaetos) in the vicinity of the Altamont Pass Wind Resource Area (WRA). The 190 km{sup 2} facility lies just east of San Francisco Bay in California and contains about 6,500 wind turbines. Grassland and oak savanna habitats surrounding the WRA support a substantial resident population of golden eagles. Each year, the U.S. Fish and Wildlife Service receivers reports from the wind industry of about 30 golden eagle casualties occurring at the WRA, and it is probable that many more carcasses go unnoticed. Over 90 percent of the casualties are attributed to collisions with wind turbines. The main purpose of this study is to estimate the effect of turbine-related mortality on the golden eagle population of the area. Assessing the impact of the WRA kills on the population requires quantification of both survival and reproduction. To estimate survival rates of both territorial and non-territorial golden eagles, we tagged 179 individuals with radio-telemetry transmitters expected to function for about four years and equipped with mortality sensors. Population segments represented in the tagged sample include 79 juveniles, 45 subadults, 17n floaters (non-territorial adults), and 38 breeders. Effective sample sizes in the older segments increase as younger eagles mature or become territorial. Since the beginning of the study, we have conducted weekly roll-call surveys by airplane to locate the tagged eagles in relation to the WRA and to monitor their survival. The surveyed area extends from the Oakland Hills southeast through the Diablo Mountain Range to San Luis Reservoir about 75 km southeast of the WRA. The surveys show that breeding eagles rarely enter the WRA while the non-territorial eagles tend to move about freely throughout the study area and often visit the WRA. |
author2 |
United States. Department of Energy. Office of Energy Efficiency and Renewable Energy. |
format |
Report |
title |
A population study of golden eagles in the Altamont Pass Wind Resource area. Second-year progress report |
title_short |
A population study of golden eagles in the Altamont Pass Wind Resource area. Second-year progress report |
title_full |
A population study of golden eagles in the Altamont Pass Wind Resource area. Second-year progress report |
title_fullStr |
A population study of golden eagles in the Altamont Pass Wind Resource area. Second-year progress report |
title_full_unstemmed |
A population study of golden eagles in the Altamont Pass Wind Resource area. Second-year progress report |
title_sort |
population study of golden eagles in the altamont pass wind resource area. second-year progress report |
publisher |
National Renewable Energy Laboratory (U.S.) |
publishDate |
1997 |
url |
https://doi.org/10.2172/531111 http://digital.library.unt.edu/ark:/67531/metadc691747/ |
long_lat |
ENVELOPE(-57.289,-57.289,-63.799,-63.799) |
geographic |
Diablo |
geographic_facet |
Diablo |
genre |
Aquila chrysaetos golden eagle |
genre_facet |
Aquila chrysaetos golden eagle |
op_source |
Other Information: PBD: Jul 1997 |
op_relation |
other: DE97008701 rep-no: NREL/SR--440-23087 grantno: AC36-83CH10093 doi:10.2172/531111 osti: 531111 http://digital.library.unt.edu/ark:/67531/metadc691747/ ark: ark:/67531/metadc691747 |
op_doi |
https://doi.org/10.2172/531111 |
_version_ |
1766242976803061760 |