Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea
Data and material are collected from 106 Harbour Porpoises ( P. phocoena ) from the southern part of the North Sea. All animals are accidentally caught or found stranded. The greatest length for males in the sample is 151 cm, for females 186 cm. For detailed analysis of body measurements, 30 males a...
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crbrillap:10.1163/26660644-04801002 2023-12-31T10:22:01+01:00 Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea van Utrecht, W.L. 1978 http://dx.doi.org/10.1163/26660644-04801002 https://brill.com/view/journals/btd/48/1/article-p16_2.xml https://brill.com/downloadpdf/journals/btd/48/1/article-p16_2.xml unknown Brill Bijdragen tot de Dierkunde volume 48, issue 1, page 16-28 ISSN 0067-8546 2666-0644 General Earth and Planetary Sciences General Environmental Science journal-article 1978 crbrillap https://doi.org/10.1163/26660644-04801002 2023-12-06T12:19:10Z Data and material are collected from 106 Harbour Porpoises ( P. phocoena ) from the southern part of the North Sea. All animals are accidentally caught or found stranded. The greatest length for males in the sample is 151 cm, for females 186 cm. For detailed analysis of body measurements, 30 males and 37 females are selected, while from 20 males and 34 females teeth are used for age analysis. The analysis of the body measurements shows sexual dimorphism in the anterior and posterior part of the back, in the flukes and flippers and in the position of the genital slit. The maximum number of dentinal layers found in the teeth is 12. Males attain sexual maturity after the deposition of 5 dentinal layers, females when 6 layers are formed, at a body length of about 135 cm and 150 cm, respectively. Some evidence is found that the population of P. phocoena from the North Sea has a lower growth rate than the population from Canadian waters. The gestation period is estimated to be eleven months, the peak of the birth period being in June. The animals are born at a length varying between 67 cm to 80 cm. Growth of the visceral organs is isogonic. The mean weight of the organs is greater in females than in males. Article in Journal/Newspaper Phocoena phocoena Brill (via Crossref) Bijdragen tot de Dierkunde 48 1 16 28 |
institution |
Open Polar |
collection |
Brill (via Crossref) |
op_collection_id |
crbrillap |
language |
unknown |
topic |
General Earth and Planetary Sciences General Environmental Science |
spellingShingle |
General Earth and Planetary Sciences General Environmental Science van Utrecht, W.L. Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea |
topic_facet |
General Earth and Planetary Sciences General Environmental Science |
description |
Data and material are collected from 106 Harbour Porpoises ( P. phocoena ) from the southern part of the North Sea. All animals are accidentally caught or found stranded. The greatest length for males in the sample is 151 cm, for females 186 cm. For detailed analysis of body measurements, 30 males and 37 females are selected, while from 20 males and 34 females teeth are used for age analysis. The analysis of the body measurements shows sexual dimorphism in the anterior and posterior part of the back, in the flukes and flippers and in the position of the genital slit. The maximum number of dentinal layers found in the teeth is 12. Males attain sexual maturity after the deposition of 5 dentinal layers, females when 6 layers are formed, at a body length of about 135 cm and 150 cm, respectively. Some evidence is found that the population of P. phocoena from the North Sea has a lower growth rate than the population from Canadian waters. The gestation period is estimated to be eleven months, the peak of the birth period being in June. The animals are born at a length varying between 67 cm to 80 cm. Growth of the visceral organs is isogonic. The mean weight of the organs is greater in females than in males. |
format |
Article in Journal/Newspaper |
author |
van Utrecht, W.L. |
author_facet |
van Utrecht, W.L. |
author_sort |
van Utrecht, W.L. |
title |
Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea |
title_short |
Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea |
title_full |
Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea |
title_fullStr |
Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea |
title_full_unstemmed |
Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea |
title_sort |
age and growth in phocoena phocoena linnaeus, 1758 (cetacea, odontoceti) from the north sea |
publisher |
Brill |
publishDate |
1978 |
url |
http://dx.doi.org/10.1163/26660644-04801002 https://brill.com/view/journals/btd/48/1/article-p16_2.xml https://brill.com/downloadpdf/journals/btd/48/1/article-p16_2.xml |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Bijdragen tot de Dierkunde volume 48, issue 1, page 16-28 ISSN 0067-8546 2666-0644 |
op_doi |
https://doi.org/10.1163/26660644-04801002 |
container_title |
Bijdragen tot de Dierkunde |
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48 |
container_issue |
1 |
container_start_page |
16 |
op_container_end_page |
28 |
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1786833003972919296 |