Morphometric variation in the Hooded seal (Cystophora cristata)
Intra‐ and intersexual variation in 16 skull dimensions and total body length of 233 aged Hooded seals caught in the north‐west Atlantic were investigated. Absolute growth was described by asymptotic growth curves applied to single dimensions, as well as to scores on the first principal component of...
Published in: | Journal of Zoology |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1985
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1469-7998.1985.tb03554.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1985.tb03554.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1985.tb03554.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1985.tb03554.x |
id |
crwiley:10.1111/j.1469-7998.1985.tb03554.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1469-7998.1985.tb03554.x 2024-06-02T08:05:41+00:00 Morphometric variation in the Hooded seal (Cystophora cristata) Wlig, Øystein 1985 http://dx.doi.org/10.1111/j.1469-7998.1985.tb03554.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1985.tb03554.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1985.tb03554.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1985.tb03554.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 206, issue 4, page 497-508 ISSN 0952-8369 1469-7998 journal-article 1985 crwiley https://doi.org/10.1111/j.1469-7998.1985.tb03554.x 2024-05-03T11:34:36Z Intra‐ and intersexual variation in 16 skull dimensions and total body length of 233 aged Hooded seals caught in the north‐west Atlantic were investigated. Absolute growth was described by asymptotic growth curves applied to single dimensions, as well as to scores on the first principal component of logarithmically transformed cranial data, which are believed to reflect the multivariate nature of growth. All dimensions were found to be fully developed later in males than in females. The growth of the male skulls was found to continue for more than 20 years, while the females approach final size about–7 years earlier than males, according to the scores on the first principal component. Female seals were found to reach 86 % of final total body length at the time of maturation, which is a generalized pinniped pattern. In both sexes, a yearling skull was characterized by a large brain‐case, which decreased relatively with growth. The male skulls were further characterized by an increase in zygomatic width and orbital width in relation to basal length, a pattern which was not found in females. All the asymptotic values were significantly larger in males than in females. The dimorphism develops mainly as a result of prolonged growth of males after the attainment of sexual maturity. Article in Journal/Newspaper Cystophora cristata hooded seal North West Atlantic Wiley Online Library Journal of Zoology 206 4 497 508 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Intra‐ and intersexual variation in 16 skull dimensions and total body length of 233 aged Hooded seals caught in the north‐west Atlantic were investigated. Absolute growth was described by asymptotic growth curves applied to single dimensions, as well as to scores on the first principal component of logarithmically transformed cranial data, which are believed to reflect the multivariate nature of growth. All dimensions were found to be fully developed later in males than in females. The growth of the male skulls was found to continue for more than 20 years, while the females approach final size about–7 years earlier than males, according to the scores on the first principal component. Female seals were found to reach 86 % of final total body length at the time of maturation, which is a generalized pinniped pattern. In both sexes, a yearling skull was characterized by a large brain‐case, which decreased relatively with growth. The male skulls were further characterized by an increase in zygomatic width and orbital width in relation to basal length, a pattern which was not found in females. All the asymptotic values were significantly larger in males than in females. The dimorphism develops mainly as a result of prolonged growth of males after the attainment of sexual maturity. |
format |
Article in Journal/Newspaper |
author |
Wlig, Øystein |
spellingShingle |
Wlig, Øystein Morphometric variation in the Hooded seal (Cystophora cristata) |
author_facet |
Wlig, Øystein |
author_sort |
Wlig, Øystein |
title |
Morphometric variation in the Hooded seal (Cystophora cristata) |
title_short |
Morphometric variation in the Hooded seal (Cystophora cristata) |
title_full |
Morphometric variation in the Hooded seal (Cystophora cristata) |
title_fullStr |
Morphometric variation in the Hooded seal (Cystophora cristata) |
title_full_unstemmed |
Morphometric variation in the Hooded seal (Cystophora cristata) |
title_sort |
morphometric variation in the hooded seal (cystophora cristata) |
publisher |
Wiley |
publishDate |
1985 |
url |
http://dx.doi.org/10.1111/j.1469-7998.1985.tb03554.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1985.tb03554.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1985.tb03554.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1985.tb03554.x |
genre |
Cystophora cristata hooded seal North West Atlantic |
genre_facet |
Cystophora cristata hooded seal North West Atlantic |
op_source |
Journal of Zoology volume 206, issue 4, page 497-508 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1469-7998.1985.tb03554.x |
container_title |
Journal of Zoology |
container_volume |
206 |
container_issue |
4 |
container_start_page |
497 |
op_container_end_page |
508 |
_version_ |
1800750557304979456 |