The life history of the narwhal, Monodon monoceros l., in the eastern Canadian arctic /
The life history of the narwhal Monodon monoceros was studied utilizing animals captured by the Inuit in northern Baffin Island. Segregation by age and sex within this population is evident, with summering groups consisting of mature females with calves, immature and maturing males, and large mature...
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McGill University
1984
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ftcanadathes:oai:collectionscanada.gc.ca:QMM.71929 2023-05-15T14:30:30+02:00 The life history of the narwhal, Monodon monoceros l., in the eastern Canadian arctic / Hay, Keith Alexander. Doctor of Philosophy (Institute of Oceanography.) 1984 application/pdf http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71929 en eng McGill University alephsysno: 000214542 proquestno: AAINK66672 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71929 All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. Narwhal Mammals -- Arctic Ocean Electronic Thesis or Dissertation 1984 ftcanadathes 2014-02-16T01:04:46Z The life history of the narwhal Monodon monoceros was studied utilizing animals captured by the Inuit in northern Baffin Island. Segregation by age and sex within this population is evident, with summering groups consisting of mature females with calves, immature and maturing males, and large mature males. The diet consists of arctic cod, shrimp, and squid during June and July, but feeding activity declines markedly during the open-water months of August and September. Growth layers in the unerupted teeth and periosteal zone of the mandible were found to be related to age but absolute rates of accumulation of these layers are uncertain. The maximum life span is estimated to be 40 to 50 years. Male narwhals, which mature sexually at lengths exceeding 390 cm and at 16-17 growth layers, display protracted maturation and a possible annual cycle of spermatogenesis. Females, which mature sexually at lengths exceeding 340 cm and at 12 growth layers, are seasonally polyoestrous, experiencing up to four consecutive ovulations during the breeding season. The gestation period is estimated to be 15.3 months. The season of conceptions is March to May and calving occurs during July and August. Since the lactation period exceeds 12 months, the interval between successive conceptions is usually three years, but about 20% of females conceive at the first breeding season following birth of their calves. The annual population birth rate is calculated to be about 0.07. The basic life history features of the narwhal are similar to those of other medium-sized toothed whales. Thesis Arctic cod Arctic Arctic Ocean Baffin Island Baffin inuit Monodon monoceros narwhal* toothed whales Theses Canada/Thèses Canada (Library and Archives Canada) Arctic Arctic Ocean Baffin Island |
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Open Polar |
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Theses Canada/Thèses Canada (Library and Archives Canada) |
op_collection_id |
ftcanadathes |
language |
English |
topic |
Narwhal Mammals -- Arctic Ocean |
spellingShingle |
Narwhal Mammals -- Arctic Ocean Hay, Keith Alexander. The life history of the narwhal, Monodon monoceros l., in the eastern Canadian arctic / |
topic_facet |
Narwhal Mammals -- Arctic Ocean |
description |
The life history of the narwhal Monodon monoceros was studied utilizing animals captured by the Inuit in northern Baffin Island. Segregation by age and sex within this population is evident, with summering groups consisting of mature females with calves, immature and maturing males, and large mature males. The diet consists of arctic cod, shrimp, and squid during June and July, but feeding activity declines markedly during the open-water months of August and September. Growth layers in the unerupted teeth and periosteal zone of the mandible were found to be related to age but absolute rates of accumulation of these layers are uncertain. The maximum life span is estimated to be 40 to 50 years. Male narwhals, which mature sexually at lengths exceeding 390 cm and at 16-17 growth layers, display protracted maturation and a possible annual cycle of spermatogenesis. Females, which mature sexually at lengths exceeding 340 cm and at 12 growth layers, are seasonally polyoestrous, experiencing up to four consecutive ovulations during the breeding season. The gestation period is estimated to be 15.3 months. The season of conceptions is March to May and calving occurs during July and August. Since the lactation period exceeds 12 months, the interval between successive conceptions is usually three years, but about 20% of females conceive at the first breeding season following birth of their calves. The annual population birth rate is calculated to be about 0.07. The basic life history features of the narwhal are similar to those of other medium-sized toothed whales. |
format |
Thesis |
author |
Hay, Keith Alexander. |
author_facet |
Hay, Keith Alexander. |
author_sort |
Hay, Keith Alexander. |
title |
The life history of the narwhal, Monodon monoceros l., in the eastern Canadian arctic / |
title_short |
The life history of the narwhal, Monodon monoceros l., in the eastern Canadian arctic / |
title_full |
The life history of the narwhal, Monodon monoceros l., in the eastern Canadian arctic / |
title_fullStr |
The life history of the narwhal, Monodon monoceros l., in the eastern Canadian arctic / |
title_full_unstemmed |
The life history of the narwhal, Monodon monoceros l., in the eastern Canadian arctic / |
title_sort |
life history of the narwhal, monodon monoceros l., in the eastern canadian arctic / |
publisher |
McGill University |
publishDate |
1984 |
url |
http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71929 |
op_coverage |
Doctor of Philosophy (Institute of Oceanography.) |
geographic |
Arctic Arctic Ocean Baffin Island |
geographic_facet |
Arctic Arctic Ocean Baffin Island |
genre |
Arctic cod Arctic Arctic Ocean Baffin Island Baffin inuit Monodon monoceros narwhal* toothed whales |
genre_facet |
Arctic cod Arctic Arctic Ocean Baffin Island Baffin inuit Monodon monoceros narwhal* toothed whales |
op_relation |
alephsysno: 000214542 proquestno: AAINK66672 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71929 |
op_rights |
All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
_version_ |
1766304338460803072 |