Availability of optimal‐sized prey affects global distribution patterns of the golden eagle Aquila chrysaetos
Climate and landscape change are expected to significantly affect trophic interactions, which will especially harm top predators such as the golden eagle Aquila chrysaetos . Availability of optimal prey is recognized to influence reproductive success of raptors on a regional scale. For the golden ea...
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Online Access: | http://dx.doi.org/10.1111/jav.00396 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjav.00396 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jav.00396 |
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crwiley:10.1111/jav.00396 2024-09-15T18:41:33+00:00 Availability of optimal‐sized prey affects global distribution patterns of the golden eagle Aquila chrysaetos Schweiger, Andreas Fünfstück, Hans‐Joachim Beierkuhnlein, Carl 2014 http://dx.doi.org/10.1111/jav.00396 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjav.00396 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jav.00396 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Avian Biology volume 46, issue 1, page 81-88 ISSN 0908-8857 1600-048X journal-article 2014 crwiley https://doi.org/10.1111/jav.00396 2024-08-30T04:11:22Z Climate and landscape change are expected to significantly affect trophic interactions, which will especially harm top predators such as the golden eagle Aquila chrysaetos . Availability of optimal prey is recognized to influence reproductive success of raptors on a regional scale. For the golden eagle, medium‐sized prey species between 0.5 and 5 kg are widely considered to be optimal prey during the breeding season, whereas smaller and larger species are deemed as energetically sub‐optimal. However, knowledge about the effects of optimal prey availability is still scarce on larger scales. To decrease this apparent knowledge gap, we combined biogeographical information on range margins with information about the foraging behaviour and reproductive success of golden eagles from 67 studies spanning the Northern Hemisphere. We hypothesized that availability of optimal prey will affect foraging behaviour and breeding success and, thus, distribution patterns of the golden eagle not only on a local but also on a continental scale. We correlated the diet breadth quantifying foraging generalism, breeding success and proportions of small (< 0.5 kg), medium (0.5–5 kg) and large‐sized (> 5 kg) prey species within the diet with the minimum distance of the examined eagles to the actual species distribution boundary. Closer to the range edge, we observed decreased proportions of medium‐sized prey species and decreasing breeding success of golden eagles. Diet breadth as well as proportions of small and large‐sized prey species increased, however, towards the range edge. Thus, availability of optimal‐sized prey species seems to be a crucial driver of foraging behaviour, breeding success and distribution of golden eagles on a continental scale. However, underlying effects of landscape characteristics and human influence on optimal prey availability has to be investigated in further large‐scale studies to fully understand the major threats facing the golden eagle and possibly other large terrestrial birds of prey. Article in Journal/Newspaper Aquila chrysaetos golden eagle Wiley Online Library Journal of Avian Biology 46 1 81 88 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Climate and landscape change are expected to significantly affect trophic interactions, which will especially harm top predators such as the golden eagle Aquila chrysaetos . Availability of optimal prey is recognized to influence reproductive success of raptors on a regional scale. For the golden eagle, medium‐sized prey species between 0.5 and 5 kg are widely considered to be optimal prey during the breeding season, whereas smaller and larger species are deemed as energetically sub‐optimal. However, knowledge about the effects of optimal prey availability is still scarce on larger scales. To decrease this apparent knowledge gap, we combined biogeographical information on range margins with information about the foraging behaviour and reproductive success of golden eagles from 67 studies spanning the Northern Hemisphere. We hypothesized that availability of optimal prey will affect foraging behaviour and breeding success and, thus, distribution patterns of the golden eagle not only on a local but also on a continental scale. We correlated the diet breadth quantifying foraging generalism, breeding success and proportions of small (< 0.5 kg), medium (0.5–5 kg) and large‐sized (> 5 kg) prey species within the diet with the minimum distance of the examined eagles to the actual species distribution boundary. Closer to the range edge, we observed decreased proportions of medium‐sized prey species and decreasing breeding success of golden eagles. Diet breadth as well as proportions of small and large‐sized prey species increased, however, towards the range edge. Thus, availability of optimal‐sized prey species seems to be a crucial driver of foraging behaviour, breeding success and distribution of golden eagles on a continental scale. However, underlying effects of landscape characteristics and human influence on optimal prey availability has to be investigated in further large‐scale studies to fully understand the major threats facing the golden eagle and possibly other large terrestrial birds of prey. |
format |
Article in Journal/Newspaper |
author |
Schweiger, Andreas Fünfstück, Hans‐Joachim Beierkuhnlein, Carl |
spellingShingle |
Schweiger, Andreas Fünfstück, Hans‐Joachim Beierkuhnlein, Carl Availability of optimal‐sized prey affects global distribution patterns of the golden eagle Aquila chrysaetos |
author_facet |
Schweiger, Andreas Fünfstück, Hans‐Joachim Beierkuhnlein, Carl |
author_sort |
Schweiger, Andreas |
title |
Availability of optimal‐sized prey affects global distribution patterns of the golden eagle Aquila chrysaetos |
title_short |
Availability of optimal‐sized prey affects global distribution patterns of the golden eagle Aquila chrysaetos |
title_full |
Availability of optimal‐sized prey affects global distribution patterns of the golden eagle Aquila chrysaetos |
title_fullStr |
Availability of optimal‐sized prey affects global distribution patterns of the golden eagle Aquila chrysaetos |
title_full_unstemmed |
Availability of optimal‐sized prey affects global distribution patterns of the golden eagle Aquila chrysaetos |
title_sort |
availability of optimal‐sized prey affects global distribution patterns of the golden eagle aquila chrysaetos |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/jav.00396 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjav.00396 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jav.00396 |
genre |
Aquila chrysaetos golden eagle |
genre_facet |
Aquila chrysaetos golden eagle |
op_source |
Journal of Avian Biology volume 46, issue 1, page 81-88 ISSN 0908-8857 1600-048X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jav.00396 |
container_title |
Journal of Avian Biology |
container_volume |
46 |
container_issue |
1 |
container_start_page |
81 |
op_container_end_page |
88 |
_version_ |
1810485953749319680 |