Age estimation of white whales (Delphinapterus leucas) from Greenland
Various techniques of displaying growth layer groups (GLGs) in teeth from white whales, Delphinapterus leucas, from Greenland were tested. The dentine and cementum in unprepared longitudinal thick sections (150-200μm) displayed under transmitted polarized light microscope generally provided the simp...
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Danish Polar Center/Museum Tusculanum Press
1994
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Online Access: | https://tidsskrift.dk/meddrgroenland_biosci/article/view/142547 |
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ftkbcopenhojs:oai:ojs.tidsskrift.dk:article/142547 2024-01-28T10:05:23+01:00 Age estimation of white whales (Delphinapterus leucas) from Greenland Heide-Jørgensen, Mads P. Jensen, Jette Larsen, Anja H. Teilmann, Jonas Neurohr, Bernhard 1994-04-22 application/pdf https://tidsskrift.dk/meddrgroenland_biosci/article/view/142547 eng eng Danish Polar Center/Museum Tusculanum Press https://tidsskrift.dk/meddrgroenland_biosci/article/view/142547/186220 https://tidsskrift.dk/meddrgroenland_biosci/article/view/142547 Meddelelser om Grønland. Bioscience; Vol. 39 (1994): Meddelelser om Grønland. Bioscience; 187-193 Meddelelser om Grønland. Bioscience; Årg. 39 (1994): Meddelelser om Grønland. Bioscience; 187-193 0106-1054 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1994 ftkbcopenhojs 2024-01-03T23:58:33Z Various techniques of displaying growth layer groups (GLGs) in teeth from white whales, Delphinapterus leucas, from Greenland were tested. The dentine and cementum in unprepared longitudinal thick sections (150-200μm) displayed under transmitted polarized light microscope generally provided the simplest and clearest display of GLGs. Teeth taken from the lower jaw of white whales in West Greenland show significant wear at a much earlier age than teeth of white whales from northern Quebec, the White Sea and the Kara Sea. The least worn teeth are usually positioned towards the rear of the lower jaw (tooth numbers 7-9). They give the highest number of GLGs and thus most accurately reflect the age of the whale. Teeth from one white whale that was captured when approximately three years old and maintained in captivity for 15 years showed 30-36 GLGs. This finding adds to the evidence that two GLGs are deposited annually in the teeth of white whales. Article in Journal/Newspaper Delphinapterus leucas Greenland Kara Sea White Sea White whale Tidsskrift.dk (The Royal Library, Denmark) Greenland Kara Sea White Sea |
institution |
Open Polar |
collection |
Tidsskrift.dk (The Royal Library, Denmark) |
op_collection_id |
ftkbcopenhojs |
language |
English |
description |
Various techniques of displaying growth layer groups (GLGs) in teeth from white whales, Delphinapterus leucas, from Greenland were tested. The dentine and cementum in unprepared longitudinal thick sections (150-200μm) displayed under transmitted polarized light microscope generally provided the simplest and clearest display of GLGs. Teeth taken from the lower jaw of white whales in West Greenland show significant wear at a much earlier age than teeth of white whales from northern Quebec, the White Sea and the Kara Sea. The least worn teeth are usually positioned towards the rear of the lower jaw (tooth numbers 7-9). They give the highest number of GLGs and thus most accurately reflect the age of the whale. Teeth from one white whale that was captured when approximately three years old and maintained in captivity for 15 years showed 30-36 GLGs. This finding adds to the evidence that two GLGs are deposited annually in the teeth of white whales. |
format |
Article in Journal/Newspaper |
author |
Heide-Jørgensen, Mads P. Jensen, Jette Larsen, Anja H. Teilmann, Jonas Neurohr, Bernhard |
spellingShingle |
Heide-Jørgensen, Mads P. Jensen, Jette Larsen, Anja H. Teilmann, Jonas Neurohr, Bernhard Age estimation of white whales (Delphinapterus leucas) from Greenland |
author_facet |
Heide-Jørgensen, Mads P. Jensen, Jette Larsen, Anja H. Teilmann, Jonas Neurohr, Bernhard |
author_sort |
Heide-Jørgensen, Mads P. |
title |
Age estimation of white whales (Delphinapterus leucas) from Greenland |
title_short |
Age estimation of white whales (Delphinapterus leucas) from Greenland |
title_full |
Age estimation of white whales (Delphinapterus leucas) from Greenland |
title_fullStr |
Age estimation of white whales (Delphinapterus leucas) from Greenland |
title_full_unstemmed |
Age estimation of white whales (Delphinapterus leucas) from Greenland |
title_sort |
age estimation of white whales (delphinapterus leucas) from greenland |
publisher |
Danish Polar Center/Museum Tusculanum Press |
publishDate |
1994 |
url |
https://tidsskrift.dk/meddrgroenland_biosci/article/view/142547 |
geographic |
Greenland Kara Sea White Sea |
geographic_facet |
Greenland Kara Sea White Sea |
genre |
Delphinapterus leucas Greenland Kara Sea White Sea White whale |
genre_facet |
Delphinapterus leucas Greenland Kara Sea White Sea White whale |
op_source |
Meddelelser om Grønland. Bioscience; Vol. 39 (1994): Meddelelser om Grønland. Bioscience; 187-193 Meddelelser om Grønland. Bioscience; Årg. 39 (1994): Meddelelser om Grønland. Bioscience; 187-193 0106-1054 |
op_relation |
https://tidsskrift.dk/meddrgroenland_biosci/article/view/142547/186220 https://tidsskrift.dk/meddrgroenland_biosci/article/view/142547 |
_version_ |
1789331636059373568 |