Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus)
Background: The Greenland shark is renowned for its great longevity, yet little is known about its reproduction. Methods: We supplemented the sparse information on this species by extrapolation from observations on other members of the sleeper shark family and the order Squaliformes. Results and con...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://portal.findresearcher.sdu.dk/da/publications/aeac2927-ce88-41ba-b9c2-b6e37b70c591 https://doi.org/10.1016/j.placenta.2020.05.014 |
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ftsydanskunivpub:oai:sdu.dk:publications/aeac2927-ce88-41ba-b9c2-b6e37b70c591 2024-05-19T07:41:08+00:00 Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) Carter, Anthony M. Soma, Hiroaki 2020-08 https://portal.findresearcher.sdu.dk/da/publications/aeac2927-ce88-41ba-b9c2-b6e37b70c591 https://doi.org/10.1016/j.placenta.2020.05.014 eng eng https://portal.findresearcher.sdu.dk/da/publications/aeac2927-ce88-41ba-b9c2-b6e37b70c591 info:eu-repo/semantics/closedAccess Carter , A M & Soma , H 2020 , ' Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) ' , Placenta , vol. 97 , pp. 26-28 . https://doi.org/10.1016/j.placenta.2020.05.014 Embryonic respiration Lecithotrophy Matrotrophy Sleeper shark Yolk sac article 2020 ftsydanskunivpub https://doi.org/10.1016/j.placenta.2020.05.014 2024-05-01T00:30:20Z Background: The Greenland shark is renowned for its great longevity, yet little is known about its reproduction. Methods: We supplemented the sparse information on this species by extrapolation from observations on other members of the sleeper shark family and the order Squaliformes. Results and conclusion: The Greenland shark is viviparous and a single observation suggests a litter size of about ten. The gestation period is unknown, but embryos reach a length of around 40 cm at birth. Nutrition is derived from the yolk sac with minimal histotrophy. The surface area of the uterus is increased by villi that presumably increase in length with advancing gestation. These villi are not likely to be secretory but play a key role in the oxygen supply to the embryo. We argue that the ability of the uterus to supply oxygen is a limiting factor for litter size, which is not likely to exceed the small number reported in this and other sleeper sharks. Article in Journal/Newspaper Greenland Somniosus microcephalus University of Southern Denmark Research Portal Placenta 97 26 28 |
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Open Polar |
collection |
University of Southern Denmark Research Portal |
op_collection_id |
ftsydanskunivpub |
language |
English |
topic |
Embryonic respiration Lecithotrophy Matrotrophy Sleeper shark Yolk sac |
spellingShingle |
Embryonic respiration Lecithotrophy Matrotrophy Sleeper shark Yolk sac Carter, Anthony M. Soma, Hiroaki Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) |
topic_facet |
Embryonic respiration Lecithotrophy Matrotrophy Sleeper shark Yolk sac |
description |
Background: The Greenland shark is renowned for its great longevity, yet little is known about its reproduction. Methods: We supplemented the sparse information on this species by extrapolation from observations on other members of the sleeper shark family and the order Squaliformes. Results and conclusion: The Greenland shark is viviparous and a single observation suggests a litter size of about ten. The gestation period is unknown, but embryos reach a length of around 40 cm at birth. Nutrition is derived from the yolk sac with minimal histotrophy. The surface area of the uterus is increased by villi that presumably increase in length with advancing gestation. These villi are not likely to be secretory but play a key role in the oxygen supply to the embryo. We argue that the ability of the uterus to supply oxygen is a limiting factor for litter size, which is not likely to exceed the small number reported in this and other sleeper sharks. |
format |
Article in Journal/Newspaper |
author |
Carter, Anthony M. Soma, Hiroaki |
author_facet |
Carter, Anthony M. Soma, Hiroaki |
author_sort |
Carter, Anthony M. |
title |
Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) |
title_short |
Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) |
title_full |
Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) |
title_fullStr |
Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) |
title_full_unstemmed |
Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) |
title_sort |
viviparity in the longest-living vertebrate, the greenland shark (somniosus microcephalus) |
publishDate |
2020 |
url |
https://portal.findresearcher.sdu.dk/da/publications/aeac2927-ce88-41ba-b9c2-b6e37b70c591 https://doi.org/10.1016/j.placenta.2020.05.014 |
genre |
Greenland Somniosus microcephalus |
genre_facet |
Greenland Somniosus microcephalus |
op_source |
Carter , A M & Soma , H 2020 , ' Viviparity in the longest-living vertebrate, the Greenland shark (Somniosus microcephalus) ' , Placenta , vol. 97 , pp. 26-28 . https://doi.org/10.1016/j.placenta.2020.05.014 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/aeac2927-ce88-41ba-b9c2-b6e37b70c591 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.placenta.2020.05.014 |
container_title |
Placenta |
container_volume |
97 |
container_start_page |
26 |
op_container_end_page |
28 |
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1799480721270636544 |