Sex Determination by Morphological Measurements of Young Rockhopper Penguins (Eudyptes chrysocome) During the Creche Phase
To provide an easy and reliable work tool to identify the sex of Rockhopper Penguin (Eudyptes chrysocome) chicks, we weighed and measured 95 nestlings in the creche phase during 24-31 January 2017 on the Falkland Islands, Argentina. Sex was subsequently determined using DNA analyses of blood from th...
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ftoregonstate:ir.library.oregonstate.edu:q524jv21h 2023-06-11T04:16:18+02:00 Sex Determination by Morphological Measurements of Young Rockhopper Penguins (Eudyptes chrysocome) During the Creche Phase Morandini, Virginia Ferrer, Miguel Perry, Lynelle Bechard, Marc https://ir.library.oregonstate.edu/concern/articles/q524jv21h English [eng] eng https://ir.library.oregonstate.edu/concern/articles/q524jv21h Attribution 4.0 (CC BY 4.0) Article ftoregonstate 2023-05-07T16:54:16Z To provide an easy and reliable work tool to identify the sex of Rockhopper Penguin (Eudyptes chrysocome) chicks, we weighed and measured 95 nestlings in the creche phase during 24-31 January 2017 on the Falkland Islands, Argentina. Sex was subsequently determined using DNA analyses of blood from the same individuals. Significant differences were found in bill length (exposed culmen), bill depth and width, flipper length, and diagonal tarsus. but stepwise discriminant analysis showed bill length to be the best predictor for sex determination. Our model correctly classified 82.7% of males and 90.2% of females (overall correct classification 86.2%). Threshold bill length was 36.64 mm, with values above this point being males and values below being females. Therefore, it appears that measuring bill length is an easy, immediate, and accurate method to sex Rockhopper Penguins during the creche phase. Article in Journal/Newspaper Rockhopper penguin ScholarsArchive@OSU (Oregon State University) Argentina |
institution |
Open Polar |
collection |
ScholarsArchive@OSU (Oregon State University) |
op_collection_id |
ftoregonstate |
language |
English |
description |
To provide an easy and reliable work tool to identify the sex of Rockhopper Penguin (Eudyptes chrysocome) chicks, we weighed and measured 95 nestlings in the creche phase during 24-31 January 2017 on the Falkland Islands, Argentina. Sex was subsequently determined using DNA analyses of blood from the same individuals. Significant differences were found in bill length (exposed culmen), bill depth and width, flipper length, and diagonal tarsus. but stepwise discriminant analysis showed bill length to be the best predictor for sex determination. Our model correctly classified 82.7% of males and 90.2% of females (overall correct classification 86.2%). Threshold bill length was 36.64 mm, with values above this point being males and values below being females. Therefore, it appears that measuring bill length is an easy, immediate, and accurate method to sex Rockhopper Penguins during the creche phase. |
format |
Article in Journal/Newspaper |
author |
Morandini, Virginia Ferrer, Miguel Perry, Lynelle Bechard, Marc |
spellingShingle |
Morandini, Virginia Ferrer, Miguel Perry, Lynelle Bechard, Marc Sex Determination by Morphological Measurements of Young Rockhopper Penguins (Eudyptes chrysocome) During the Creche Phase |
author_facet |
Morandini, Virginia Ferrer, Miguel Perry, Lynelle Bechard, Marc |
author_sort |
Morandini, Virginia |
title |
Sex Determination by Morphological Measurements of Young Rockhopper Penguins (Eudyptes chrysocome) During the Creche Phase |
title_short |
Sex Determination by Morphological Measurements of Young Rockhopper Penguins (Eudyptes chrysocome) During the Creche Phase |
title_full |
Sex Determination by Morphological Measurements of Young Rockhopper Penguins (Eudyptes chrysocome) During the Creche Phase |
title_fullStr |
Sex Determination by Morphological Measurements of Young Rockhopper Penguins (Eudyptes chrysocome) During the Creche Phase |
title_full_unstemmed |
Sex Determination by Morphological Measurements of Young Rockhopper Penguins (Eudyptes chrysocome) During the Creche Phase |
title_sort |
sex determination by morphological measurements of young rockhopper penguins (eudyptes chrysocome) during the creche phase |
url |
https://ir.library.oregonstate.edu/concern/articles/q524jv21h |
geographic |
Argentina |
geographic_facet |
Argentina |
genre |
Rockhopper penguin |
genre_facet |
Rockhopper penguin |
op_relation |
https://ir.library.oregonstate.edu/concern/articles/q524jv21h |
op_rights |
Attribution 4.0 (CC BY 4.0) |
_version_ |
1768373926197460992 |