Characteristics of cliff nest sites of Golden Eagles in forested hills of southeast Norway
Cover photo: Adult Golden Eagle. Photo: Kristian Henriksen. The characteristics of cliff nest sites of the Golden Eagle Aquila chrysaetos were evaluated from a sample of 57 nests, located during 2000–2020 in the forested valley of Valdres in southeast Norway. About 80% of nests were facing to the so...
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BirdLife Norway
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ftboapojs:oai:boap.uib.no:article/3698 2023-11-12T04:28:12+01:00 Characteristics of cliff nest sites of Golden Eagles in forested hills of southeast Norway Dunker, Henning 2023-06-25 application/pdf https://boap.uib.no/index.php/ornis/article/view/3698 eng eng BirdLife Norway https://boap.uib.no/index.php/ornis/article/view/3698/3644 https://boap.uib.no/index.php/ornis/article/view/3698 Copyright (c) 2023 Henning Dunker https://creativecommons.org/licenses/by/4.0 Ornis Norvegica; Vol 46 (2023); 22-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftboapojs 2023-11-01T23:41:11Z Cover photo: Adult Golden Eagle. Photo: Kristian Henriksen. The characteristics of cliff nest sites of the Golden Eagle Aquila chrysaetos were evaluated from a sample of 57 nests, located during 2000–2020 in the forested valley of Valdres in southeast Norway. About 80% of nests were facing to the south and east, but availability of nest ledges seemed largely a consequence of cliff structure and orientation. Among the 57 nest sites, 4% were placed in a corner with vertical walls, 33% on a ledge with overhang, 10% on a ledge with a vertical back wall, 2% on a ledge with a reclining wall, 49% within a cavity and 2% within a cave. Thus, about 83% of the nest sites were sheltered by an overhang, a cavity or a cave in the cliff within 0.5–2 meters from the nest, and only 16% of sites lacked shelter from above. Heavy snowfall in early spring, torrential rain or strong winds in spring and summer may increase mortality among the nestlings unless the nest site is well sheltered. Moreover, a dry and snowless nest may allow the eagles to start early incubation in late March, thereby increasing fledgling survival. Cavitynests are sheltered sites with less visibility that might protect from attacks from other raptors and Ravens Corax corax. Article in Journal/Newspaper Aquila chrysaetos golden eagle Bergen Open Access Publishing (University of Bergen Library) Norway |
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Bergen Open Access Publishing (University of Bergen Library) |
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ftboapojs |
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English |
description |
Cover photo: Adult Golden Eagle. Photo: Kristian Henriksen. The characteristics of cliff nest sites of the Golden Eagle Aquila chrysaetos were evaluated from a sample of 57 nests, located during 2000–2020 in the forested valley of Valdres in southeast Norway. About 80% of nests were facing to the south and east, but availability of nest ledges seemed largely a consequence of cliff structure and orientation. Among the 57 nest sites, 4% were placed in a corner with vertical walls, 33% on a ledge with overhang, 10% on a ledge with a vertical back wall, 2% on a ledge with a reclining wall, 49% within a cavity and 2% within a cave. Thus, about 83% of the nest sites were sheltered by an overhang, a cavity or a cave in the cliff within 0.5–2 meters from the nest, and only 16% of sites lacked shelter from above. Heavy snowfall in early spring, torrential rain or strong winds in spring and summer may increase mortality among the nestlings unless the nest site is well sheltered. Moreover, a dry and snowless nest may allow the eagles to start early incubation in late March, thereby increasing fledgling survival. Cavitynests are sheltered sites with less visibility that might protect from attacks from other raptors and Ravens Corax corax. |
format |
Article in Journal/Newspaper |
author |
Dunker, Henning |
spellingShingle |
Dunker, Henning Characteristics of cliff nest sites of Golden Eagles in forested hills of southeast Norway |
author_facet |
Dunker, Henning |
author_sort |
Dunker, Henning |
title |
Characteristics of cliff nest sites of Golden Eagles in forested hills of southeast Norway |
title_short |
Characteristics of cliff nest sites of Golden Eagles in forested hills of southeast Norway |
title_full |
Characteristics of cliff nest sites of Golden Eagles in forested hills of southeast Norway |
title_fullStr |
Characteristics of cliff nest sites of Golden Eagles in forested hills of southeast Norway |
title_full_unstemmed |
Characteristics of cliff nest sites of Golden Eagles in forested hills of southeast Norway |
title_sort |
characteristics of cliff nest sites of golden eagles in forested hills of southeast norway |
publisher |
BirdLife Norway |
publishDate |
2023 |
url |
https://boap.uib.no/index.php/ornis/article/view/3698 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Aquila chrysaetos golden eagle |
genre_facet |
Aquila chrysaetos golden eagle |
op_source |
Ornis Norvegica; Vol 46 (2023); 22-27 |
op_relation |
https://boap.uib.no/index.php/ornis/article/view/3698/3644 https://boap.uib.no/index.php/ornis/article/view/3698 |
op_rights |
Copyright (c) 2023 Henning Dunker https://creativecommons.org/licenses/by/4.0 |
_version_ |
1782341481415049216 |