A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica
The age of 43 minke whales (Balaenoptera acutorostrata) was estimated by counting growth layer groups (GLGs) GLGs in 500um thick haemotoxylin stained transverse sections of left and right mandible. The same whales were also aged by counting GLGs in 150um unstained sections of left and right bulla ty...
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ftimr:oai:imr.brage.unit.no:11250/100489 2023-05-15T15:36:05+02:00 A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica Olsen, Erik Skaug, Hans Julius Leithe, Arild Bergflødt, Bjørn Fagerheim, Kjell Arne 2001 906868 bytes application/pdf http://hdl.handle.net/11250/100489 eng eng ICES ICES CM documents 2001/J:34 http://hdl.handle.net/11250/100489 13 s. minke whale vågehval VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Working paper 2001 ftimr 2021-09-23T20:14:37Z The age of 43 minke whales (Balaenoptera acutorostrata) was estimated by counting growth layer groups (GLGs) GLGs in 500um thick haemotoxylin stained transverse sections of left and right mandible. The same whales were also aged by counting GLGs in 150um unstained sections of left and right bulla tympanica. The staining and preparation methods were also used to prepare and stain mandible sections of a sperm whale and the GLG count of this was the same as the GLG count of a longitudinal section of a tooth from the same animal. Minke whale mandible age estimates had higher CV (63% on average) than the bulla age estimates (36% on average). Comparing the age estimates with the number of ovulations revealed that both methods underestimated the true age of the whales. Report Balaenoptera acutorostrata minke whale Sperm whale vågehval Institute for Marine Research: Brage IMR |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
minke whale vågehval VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
spellingShingle |
minke whale vågehval VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Olsen, Erik Skaug, Hans Julius Leithe, Arild Bergflødt, Bjørn Fagerheim, Kjell Arne A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica |
topic_facet |
minke whale vågehval VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
description |
The age of 43 minke whales (Balaenoptera acutorostrata) was estimated by counting growth layer groups (GLGs) GLGs in 500um thick haemotoxylin stained transverse sections of left and right mandible. The same whales were also aged by counting GLGs in 150um unstained sections of left and right bulla tympanica. The staining and preparation methods were also used to prepare and stain mandible sections of a sperm whale and the GLG count of this was the same as the GLG count of a longitudinal section of a tooth from the same animal. Minke whale mandible age estimates had higher CV (63% on average) than the bulla age estimates (36% on average). Comparing the age estimates with the number of ovulations revealed that both methods underestimated the true age of the whales. |
format |
Report |
author |
Olsen, Erik Skaug, Hans Julius Leithe, Arild Bergflødt, Bjørn Fagerheim, Kjell Arne |
author_facet |
Olsen, Erik Skaug, Hans Julius Leithe, Arild Bergflødt, Bjørn Fagerheim, Kjell Arne |
author_sort |
Olsen, Erik |
title |
A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica |
title_short |
A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica |
title_full |
A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica |
title_fullStr |
A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica |
title_full_unstemmed |
A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica |
title_sort |
comparison of variability and bias when ageing northeastern atlantic minke whales (balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica |
publisher |
ICES |
publishDate |
2001 |
url |
http://hdl.handle.net/11250/100489 |
genre |
Balaenoptera acutorostrata minke whale Sperm whale vågehval |
genre_facet |
Balaenoptera acutorostrata minke whale Sperm whale vågehval |
op_source |
13 s. |
op_relation |
ICES CM documents 2001/J:34 http://hdl.handle.net/11250/100489 |
_version_ |
1766366419334725632 |