Seasonal and developmental changes of reproductive organs of male ringed seals ( Phoca hispida) in the Svalbard area
The weights of testes, prostate gland and baculum of ringed seal males were related to age, season and differences in body size. There was a significant seasonal variation in testes and prostate gland size of sexually mature males, with a maximum occurring in early April. There were no seasonal chan...
Published in: | Journal of Zoology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley
1991
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Online Access: | http://dx.doi.org/10.1111/j.1469-7998.1991.tb04790.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1991.tb04790.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1991.tb04790.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1991.tb04790.x |
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crwiley:10.1111/j.1469-7998.1991.tb04790.x 2024-06-02T08:13:12+00:00 Seasonal and developmental changes of reproductive organs of male ringed seals ( Phoca hispida) in the Svalbard area Ryg, M. Smith, T. G. ØRitsland, N. A. 1991 http://dx.doi.org/10.1111/j.1469-7998.1991.tb04790.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1991.tb04790.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1991.tb04790.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1991.tb04790.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 224, issue 1, page 93-100 ISSN 0952-8369 1469-7998 journal-article 1991 crwiley https://doi.org/10.1111/j.1469-7998.1991.tb04790.x 2024-05-03T10:54:04Z The weights of testes, prostate gland and baculum of ringed seal males were related to age, season and differences in body size. There was a significant seasonal variation in testes and prostate gland size of sexually mature males, with a maximum occurring in early April. There were no seasonal changes in prostate weight of immature males, but some of the older immatures had elevated testes weights in April. Testes weight was significantly correlated with lean body mass. The increase in testes size with increasing body weight was greater for seals six years of age or older than for younger males. We suggest that some testicular growth and a seasonal cycle in testes growth occur before the testes become functional endocrinologically. We also believe that the primary event leading to puberty in ringed seals is an age‐dependent shift in metabolic processes, directing a larger percentage of available energy towards the reproductive organs. Article in Journal/Newspaper Phoca hispida ringed seal Svalbard Wiley Online Library Svalbard Journal of Zoology 224 1 93 100 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
The weights of testes, prostate gland and baculum of ringed seal males were related to age, season and differences in body size. There was a significant seasonal variation in testes and prostate gland size of sexually mature males, with a maximum occurring in early April. There were no seasonal changes in prostate weight of immature males, but some of the older immatures had elevated testes weights in April. Testes weight was significantly correlated with lean body mass. The increase in testes size with increasing body weight was greater for seals six years of age or older than for younger males. We suggest that some testicular growth and a seasonal cycle in testes growth occur before the testes become functional endocrinologically. We also believe that the primary event leading to puberty in ringed seals is an age‐dependent shift in metabolic processes, directing a larger percentage of available energy towards the reproductive organs. |
format |
Article in Journal/Newspaper |
author |
Ryg, M. Smith, T. G. ØRitsland, N. A. |
spellingShingle |
Ryg, M. Smith, T. G. ØRitsland, N. A. Seasonal and developmental changes of reproductive organs of male ringed seals ( Phoca hispida) in the Svalbard area |
author_facet |
Ryg, M. Smith, T. G. ØRitsland, N. A. |
author_sort |
Ryg, M. |
title |
Seasonal and developmental changes of reproductive organs of male ringed seals ( Phoca hispida) in the Svalbard area |
title_short |
Seasonal and developmental changes of reproductive organs of male ringed seals ( Phoca hispida) in the Svalbard area |
title_full |
Seasonal and developmental changes of reproductive organs of male ringed seals ( Phoca hispida) in the Svalbard area |
title_fullStr |
Seasonal and developmental changes of reproductive organs of male ringed seals ( Phoca hispida) in the Svalbard area |
title_full_unstemmed |
Seasonal and developmental changes of reproductive organs of male ringed seals ( Phoca hispida) in the Svalbard area |
title_sort |
seasonal and developmental changes of reproductive organs of male ringed seals ( phoca hispida) in the svalbard area |
publisher |
Wiley |
publishDate |
1991 |
url |
http://dx.doi.org/10.1111/j.1469-7998.1991.tb04790.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-7998.1991.tb04790.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1991.tb04790.x https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.1991.tb04790.x |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Phoca hispida ringed seal Svalbard |
genre_facet |
Phoca hispida ringed seal Svalbard |
op_source |
Journal of Zoology volume 224, issue 1, page 93-100 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1469-7998.1991.tb04790.x |
container_title |
Journal of Zoology |
container_volume |
224 |
container_issue |
1 |
container_start_page |
93 |
op_container_end_page |
100 |
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1800736618656563200 |