The possible occurrence of cranial asymmetry in three harrier (Accipitridae: Circus) species
Abstract The harriers (Accipitridae: Circus ) represent a unique group of raptorial birds due to their hunting behaviour and their facial ruff and prominent facial disc. During previous studies it was suggested that harrier species may have other convergent features shared with owls like asymmetric...
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Walter de Gruyter GmbH
2021
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Online Access: | http://dx.doi.org/10.2478/orhu-2021-0011 https://www.sciendo.com/pdf/10.2478/orhu-2021-0011 |
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crdegruyter:10.2478/orhu-2021-0011 2024-09-15T18:02:09+00:00 The possible occurrence of cranial asymmetry in three harrier (Accipitridae: Circus) species Pecsics, Tibor Marx, András Csörgő, Tibor 2021 http://dx.doi.org/10.2478/orhu-2021-0011 https://www.sciendo.com/pdf/10.2478/orhu-2021-0011 en eng Walter de Gruyter GmbH http://creativecommons.org/licenses/by-nc-nd/4.0 Ornis Hungarica volume 29, issue 1, page 139-148 ISSN 2061-9588 journal-article 2021 crdegruyter https://doi.org/10.2478/orhu-2021-0011 2024-07-29T04:10:56Z Abstract The harriers (Accipitridae: Circus ) represent a unique group of raptorial birds due to their hunting behaviour and their facial ruff and prominent facial disc. During previous studies it was suggested that harrier species may have other convergent features shared with owls like asymmetric or enlarged ear openings related to sensitive hearing capabilities. In this study, cranial asymmetry was done using SAGE (Symmetry and Asymmetry of Geometric Data) software. 32 skulls of 3 species (Western Marsh Harrier (Circus aeruginosus ) n=8, Montagu’s Harrier (Circus pygargus) n=10, Hen Harrier (Circus cyaneus) n=14) were photographed, digitized and assigned with 2D landmarks with TpsDig software. The variables were analysed based on Generalized Procrustes analysis. The morphometric data showed cranial asymmetry of harriers. This asymmetry should rather be explained by foraging strategies as the results are corresponding to the exceptionally good hearing of these species among diurnal raptors. Article in Journal/Newspaper Circus cyaneus Ruff De Gruyter Ornis Hungarica 29 1 139 148 |
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Open Polar |
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De Gruyter |
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crdegruyter |
language |
English |
description |
Abstract The harriers (Accipitridae: Circus ) represent a unique group of raptorial birds due to their hunting behaviour and their facial ruff and prominent facial disc. During previous studies it was suggested that harrier species may have other convergent features shared with owls like asymmetric or enlarged ear openings related to sensitive hearing capabilities. In this study, cranial asymmetry was done using SAGE (Symmetry and Asymmetry of Geometric Data) software. 32 skulls of 3 species (Western Marsh Harrier (Circus aeruginosus ) n=8, Montagu’s Harrier (Circus pygargus) n=10, Hen Harrier (Circus cyaneus) n=14) were photographed, digitized and assigned with 2D landmarks with TpsDig software. The variables were analysed based on Generalized Procrustes analysis. The morphometric data showed cranial asymmetry of harriers. This asymmetry should rather be explained by foraging strategies as the results are corresponding to the exceptionally good hearing of these species among diurnal raptors. |
format |
Article in Journal/Newspaper |
author |
Pecsics, Tibor Marx, András Csörgő, Tibor |
spellingShingle |
Pecsics, Tibor Marx, András Csörgő, Tibor The possible occurrence of cranial asymmetry in three harrier (Accipitridae: Circus) species |
author_facet |
Pecsics, Tibor Marx, András Csörgő, Tibor |
author_sort |
Pecsics, Tibor |
title |
The possible occurrence of cranial asymmetry in three harrier (Accipitridae: Circus) species |
title_short |
The possible occurrence of cranial asymmetry in three harrier (Accipitridae: Circus) species |
title_full |
The possible occurrence of cranial asymmetry in three harrier (Accipitridae: Circus) species |
title_fullStr |
The possible occurrence of cranial asymmetry in three harrier (Accipitridae: Circus) species |
title_full_unstemmed |
The possible occurrence of cranial asymmetry in three harrier (Accipitridae: Circus) species |
title_sort |
possible occurrence of cranial asymmetry in three harrier (accipitridae: circus) species |
publisher |
Walter de Gruyter GmbH |
publishDate |
2021 |
url |
http://dx.doi.org/10.2478/orhu-2021-0011 https://www.sciendo.com/pdf/10.2478/orhu-2021-0011 |
genre |
Circus cyaneus Ruff |
genre_facet |
Circus cyaneus Ruff |
op_source |
Ornis Hungarica volume 29, issue 1, page 139-148 ISSN 2061-9588 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
op_doi |
https://doi.org/10.2478/orhu-2021-0011 |
container_title |
Ornis Hungarica |
container_volume |
29 |
container_issue |
1 |
container_start_page |
139 |
op_container_end_page |
148 |
_version_ |
1810439411823804416 |