Sexual dimorphism of Dall's porpoise and harbor porpoise skulls
To evaluate and quantify sexual dimorphism of skull shape and assess the ontogenetic background for differences, samples of 134 harbor porpoise (Phocoena phocoena) and 85 Dall's porpoise (Phocoenoides dalli) were compared in terms of cranial shape and shape ontogeny using three-dimensional geom...
Published in: | Mammalian Biology |
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Language: | English |
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2013
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Online Access: | https://pure.au.dk/portal/da/publications/sexual-dimorphism-of-dalls-porpoise-and-harbor-porpoise-skulls(8beaae24-b57e-4949-bbe2-e20657f2f822).html https://doi.org/10.1016/j.mambio.2012.04.005 http://www.scopus.com/inward/record.url?scp=84860903503&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/8beaae24-b57e-4949-bbe2-e20657f2f822 2023-05-15T17:59:10+02:00 Sexual dimorphism of Dall's porpoise and harbor porpoise skulls Frandsen, Marie Michele Schou Galatius, A. 2013 https://pure.au.dk/portal/da/publications/sexual-dimorphism-of-dalls-porpoise-and-harbor-porpoise-skulls(8beaae24-b57e-4949-bbe2-e20657f2f822).html https://doi.org/10.1016/j.mambio.2012.04.005 http://www.scopus.com/inward/record.url?scp=84860903503&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Frandsen , M M S & Galatius , A 2013 , ' Sexual dimorphism of Dall's porpoise and harbor porpoise skulls ' , Mammalian Biology , vol. 78 , no. 2 , pp. 153-156 . https://doi.org/10.1016/j.mambio.2012.04.005 article 2013 ftuniaarhuspubl https://doi.org/10.1016/j.mambio.2012.04.005 2020-07-18T21:21:45Z To evaluate and quantify sexual dimorphism of skull shape and assess the ontogenetic background for differences, samples of 134 harbor porpoise (Phocoena phocoena) and 85 Dall's porpoise (Phocoenoides dalli) were compared in terms of cranial shape and shape ontogeny using three-dimensional geometric morphometrics. After correction for allometry, no sexual differences were detected in harbor porpoise, while Dall's porpoise showed statistically significant sexual dimorphism of skull shape. Since no sex-specific differences were detected in the directionalities of the ontogenetic vectors, we cannot reject that the dimorphism is innate. Based on the different mating systems of the two species and the lack of sexual dimorphism in the harbor porpoise, the dimorphism in Dall's porpoise is most likely a result of sexual selection in relation physical competition for mates given that male skulls provide room for larger neck muscles with a more favorable lever arm. Article in Journal/Newspaper Phocoena phocoena Aarhus University: Research Lever ENVELOPE(-63.608,-63.608,-65.506,-65.506) Mammalian Biology 78 2 153 156 |
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Open Polar |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
To evaluate and quantify sexual dimorphism of skull shape and assess the ontogenetic background for differences, samples of 134 harbor porpoise (Phocoena phocoena) and 85 Dall's porpoise (Phocoenoides dalli) were compared in terms of cranial shape and shape ontogeny using three-dimensional geometric morphometrics. After correction for allometry, no sexual differences were detected in harbor porpoise, while Dall's porpoise showed statistically significant sexual dimorphism of skull shape. Since no sex-specific differences were detected in the directionalities of the ontogenetic vectors, we cannot reject that the dimorphism is innate. Based on the different mating systems of the two species and the lack of sexual dimorphism in the harbor porpoise, the dimorphism in Dall's porpoise is most likely a result of sexual selection in relation physical competition for mates given that male skulls provide room for larger neck muscles with a more favorable lever arm. |
format |
Article in Journal/Newspaper |
author |
Frandsen, Marie Michele Schou Galatius, A. |
spellingShingle |
Frandsen, Marie Michele Schou Galatius, A. Sexual dimorphism of Dall's porpoise and harbor porpoise skulls |
author_facet |
Frandsen, Marie Michele Schou Galatius, A. |
author_sort |
Frandsen, Marie Michele Schou |
title |
Sexual dimorphism of Dall's porpoise and harbor porpoise skulls |
title_short |
Sexual dimorphism of Dall's porpoise and harbor porpoise skulls |
title_full |
Sexual dimorphism of Dall's porpoise and harbor porpoise skulls |
title_fullStr |
Sexual dimorphism of Dall's porpoise and harbor porpoise skulls |
title_full_unstemmed |
Sexual dimorphism of Dall's porpoise and harbor porpoise skulls |
title_sort |
sexual dimorphism of dall's porpoise and harbor porpoise skulls |
publishDate |
2013 |
url |
https://pure.au.dk/portal/da/publications/sexual-dimorphism-of-dalls-porpoise-and-harbor-porpoise-skulls(8beaae24-b57e-4949-bbe2-e20657f2f822).html https://doi.org/10.1016/j.mambio.2012.04.005 http://www.scopus.com/inward/record.url?scp=84860903503&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-63.608,-63.608,-65.506,-65.506) |
geographic |
Lever |
geographic_facet |
Lever |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Frandsen , M M S & Galatius , A 2013 , ' Sexual dimorphism of Dall's porpoise and harbor porpoise skulls ' , Mammalian Biology , vol. 78 , no. 2 , pp. 153-156 . https://doi.org/10.1016/j.mambio.2012.04.005 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.mambio.2012.04.005 |
container_title |
Mammalian Biology |
container_volume |
78 |
container_issue |
2 |
container_start_page |
153 |
op_container_end_page |
156 |
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1766167933990469632 |