Use of two distant nesting areas as a breeding strategy of Golden Eagles (Aquila chrysaetos) in Valdres, southeast Norway
Cover photo: Golden eagle. Photo: Frode Falkenberg. Sixteen occupied nesting territories of Golden Eagle Aquila chrysaetos were studied between 2000 and 2020, in the southern part of the valley of Valdres, southeast Norway. Most of the study area consists of rolling hills dominated by spruce Picea a...
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Norsk Ornitologisk Forening
2021
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ftboapojs:oai:boap.uib.no:article/3114 2023-05-15T18:49:20+02:00 Use of two distant nesting areas as a breeding strategy of Golden Eagles (Aquila chrysaetos) in Valdres, southeast Norway Dunker, Henning 2021-03-29 application/pdf https://boap.uib.no/index.php/ornis/article/view/3114 https://doi.org/10.15845/on.v44i0.3114 eng eng Norsk Ornitologisk Forening https://boap.uib.no/index.php/ornis/article/view/3114/3176 https://boap.uib.no/index.php/ornis/article/view/3114 doi:10.15845/on.v44i0.3114 Copyright (c) 2021 Henning Dunker http://creativecommons.org/licenses/by/4.0 CC-BY Ornis Norvegica; Vol 44 (2021); 12-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftboapojs https://doi.org/10.15845/on.v44i0.3114 2021-09-29T22:33:23Z Cover photo: Golden eagle. Photo: Frode Falkenberg. Sixteen occupied nesting territories of Golden Eagle Aquila chrysaetos were studied between 2000 and 2020, in the southern part of the valley of Valdres, southeast Norway. Most of the study area consists of rolling hills dominated by spruce Picea abies with numerous clear-cuts. It was concluded that at least six (about 40%) of the eagle pairs in these territories move back and forth between two alternate, distant nesting areas 5.3 km apart (average). In two additional pairs, a second nesting area was considered possible. In the remaining eight, only one nesting area was found. The periods of one nesting area in use varied from 2–19 years, before moving to the other nesting area. This result was supported by panoramic mid-day surveillance of the air space between the two nesting areas during 2014–2020. The maintenance of a second core nesting area is most likely a strategy for moving to a more favourable hunting area and might be initiated by a new mate in the pair. The move might also be influenced by avoidance of a close neighbouring pair. A switch of nesting areas, as indicated by this study, could significantly affect results, when the number of eagle pairs in a certain area is counted. Cover photo: Golden eagle. Photo: Frode Falkenberg. Cover photo: Golden eagle. Photo: Frode Falkenberg. Sixteen occupied nesting territories of Golden Eagle Aquila chrysaetos were studied between 2000 and 2020, in the southern part of the valley of Valdres, southeast Norway. Most of the study area consists of rolling hills dominated by spruce Picea abies with numerous clear-cuts. It was concluded that at least six (about 40%) of the eagle pairs in these territories move back and forth between two alternate, distant nesting areas 5.3 km apart (average). In two additional pairs, a second nesting area was considered possible. In the remaining eight, only one nesting area was found. The periods of one nesting area in use varied from 2–19 years, before moving to the other nesting area. This result was supported by panoramic mid-day surveillance of the air space between the two nesting areas during 2014–2020. The maintenance of a second core nesting area is most likely a strategy for moving to a more favourable hunting area and might be initiated by a new mate in the pair. The move might also be influenced by avoidance of a close neighbouring pair. A switch of nesting areas, as indicated by this study, could significantly affect results, when the number of eagle pairs in a certain area is counted. Article in Journal/Newspaper Aquila chrysaetos golden eagle Bergen Open Access Publishing (University of Bergen Library) Norway Ornis Norvegica 44 12 18 |
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Open Polar |
collection |
Bergen Open Access Publishing (University of Bergen Library) |
op_collection_id |
ftboapojs |
language |
English |
description |
Cover photo: Golden eagle. Photo: Frode Falkenberg. Sixteen occupied nesting territories of Golden Eagle Aquila chrysaetos were studied between 2000 and 2020, in the southern part of the valley of Valdres, southeast Norway. Most of the study area consists of rolling hills dominated by spruce Picea abies with numerous clear-cuts. It was concluded that at least six (about 40%) of the eagle pairs in these territories move back and forth between two alternate, distant nesting areas 5.3 km apart (average). In two additional pairs, a second nesting area was considered possible. In the remaining eight, only one nesting area was found. The periods of one nesting area in use varied from 2–19 years, before moving to the other nesting area. This result was supported by panoramic mid-day surveillance of the air space between the two nesting areas during 2014–2020. The maintenance of a second core nesting area is most likely a strategy for moving to a more favourable hunting area and might be initiated by a new mate in the pair. The move might also be influenced by avoidance of a close neighbouring pair. A switch of nesting areas, as indicated by this study, could significantly affect results, when the number of eagle pairs in a certain area is counted. Cover photo: Golden eagle. Photo: Frode Falkenberg. Cover photo: Golden eagle. Photo: Frode Falkenberg. Sixteen occupied nesting territories of Golden Eagle Aquila chrysaetos were studied between 2000 and 2020, in the southern part of the valley of Valdres, southeast Norway. Most of the study area consists of rolling hills dominated by spruce Picea abies with numerous clear-cuts. It was concluded that at least six (about 40%) of the eagle pairs in these territories move back and forth between two alternate, distant nesting areas 5.3 km apart (average). In two additional pairs, a second nesting area was considered possible. In the remaining eight, only one nesting area was found. The periods of one nesting area in use varied from 2–19 years, before moving to the other nesting area. This result was supported by panoramic mid-day surveillance of the air space between the two nesting areas during 2014–2020. The maintenance of a second core nesting area is most likely a strategy for moving to a more favourable hunting area and might be initiated by a new mate in the pair. The move might also be influenced by avoidance of a close neighbouring pair. A switch of nesting areas, as indicated by this study, could significantly affect results, when the number of eagle pairs in a certain area is counted. |
format |
Article in Journal/Newspaper |
author |
Dunker, Henning |
spellingShingle |
Dunker, Henning Use of two distant nesting areas as a breeding strategy of Golden Eagles (Aquila chrysaetos) in Valdres, southeast Norway |
author_facet |
Dunker, Henning |
author_sort |
Dunker, Henning |
title |
Use of two distant nesting areas as a breeding strategy of Golden Eagles (Aquila chrysaetos) in Valdres, southeast Norway |
title_short |
Use of two distant nesting areas as a breeding strategy of Golden Eagles (Aquila chrysaetos) in Valdres, southeast Norway |
title_full |
Use of two distant nesting areas as a breeding strategy of Golden Eagles (Aquila chrysaetos) in Valdres, southeast Norway |
title_fullStr |
Use of two distant nesting areas as a breeding strategy of Golden Eagles (Aquila chrysaetos) in Valdres, southeast Norway |
title_full_unstemmed |
Use of two distant nesting areas as a breeding strategy of Golden Eagles (Aquila chrysaetos) in Valdres, southeast Norway |
title_sort |
use of two distant nesting areas as a breeding strategy of golden eagles (aquila chrysaetos) in valdres, southeast norway |
publisher |
Norsk Ornitologisk Forening |
publishDate |
2021 |
url |
https://boap.uib.no/index.php/ornis/article/view/3114 https://doi.org/10.15845/on.v44i0.3114 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Aquila chrysaetos golden eagle |
genre_facet |
Aquila chrysaetos golden eagle |
op_source |
Ornis Norvegica; Vol 44 (2021); 12-18 |
op_relation |
https://boap.uib.no/index.php/ornis/article/view/3114/3176 https://boap.uib.no/index.php/ornis/article/view/3114 doi:10.15845/on.v44i0.3114 |
op_rights |
Copyright (c) 2021 Henning Dunker http://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.15845/on.v44i0.3114 |
container_title |
Ornis Norvegica |
container_volume |
44 |
container_start_page |
12 |
op_container_end_page |
18 |
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1766242929599315968 |