Some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving
Abstract The hearts and ascending aortae of 11 Weddell seals, Leptonychotes weddelli , three adult Crabeater seals, Lobodon carcinophagus , two adult Ross seals, Ommatophoca rossi , and one adult Leopard seal, Hydrurga leptonyx , were examined for comparison with terrestrial forms. The Weddell seal...
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crwiley:10.1002/jmor.1051450106 2024-06-23T07:46:37+00:00 Some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving Drabek, Charles M. 1975 http://dx.doi.org/10.1002/jmor.1051450106 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjmor.1051450106 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jmor.1051450106 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Morphology volume 145, issue 1, page 85-105 ISSN 0362-2525 1097-4687 journal-article 1975 crwiley https://doi.org/10.1002/jmor.1051450106 2024-06-06T04:19:53Z Abstract The hearts and ascending aortae of 11 Weddell seals, Leptonychotes weddelli , three adult Crabeater seals, Lobodon carcinophagus , two adult Ross seals, Ommatophoca rossi , and one adult Leopard seal, Hydrurga leptonyx , were examined for comparison with terrestrial forms. The Weddell seal specimens were from animals ranging in age from midterm in fetal development to mature adults. All specimens were collected in 1971, 1972, and 1973, from McMurdo Sound and the Ross Sea, Antarctica. The phocid hearts were characteristically broader and flatter than those of other carnivore families and they tended toward bifid apices. The heart form indices (height/circumference) averaged 31.5 compared to 39.0 for felids. The right ventricular chambers of the Antarctic seals were found to average longer in Weddells and narrower in all, than those reported for four other carnivore families. An elastic enlargement was present in the ascending aortae of all seals. The largest diameter of the aortic bulb averaged 25.5 mm more than the base of the aorta in the adult Weddell seals which represented an increase of 72.5% over the base. It is suggested that the general heart form, and especially the ascending aortae, are anatomical adaptations to diving. The compressed heart makes possible unimpaired function when the chest is compressed during deep dives. The aortic bulb maintains mean arterial blood pressure and perfusion of the brain and cardiac tissue during diving bradycardia. Article in Journal/Newspaper Antarc* Antarctic Antarctica Crabeater Seals Hydrurga leptonyx Leopard Seal Leptonychotes weddelli Lobodon carcinophagus McMurdo Sound Ommatophoca rossi Ross Sea Weddell Seal Weddell Seals Wiley Online Library Antarctic Hydrurga ENVELOPE(-61.626,-61.626,-64.145,-64.145) McMurdo Sound Ross Sea The Antarctic Weddell Journal of Morphology 145 1 85 105 |
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Open Polar |
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Wiley Online Library |
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language |
English |
description |
Abstract The hearts and ascending aortae of 11 Weddell seals, Leptonychotes weddelli , three adult Crabeater seals, Lobodon carcinophagus , two adult Ross seals, Ommatophoca rossi , and one adult Leopard seal, Hydrurga leptonyx , were examined for comparison with terrestrial forms. The Weddell seal specimens were from animals ranging in age from midterm in fetal development to mature adults. All specimens were collected in 1971, 1972, and 1973, from McMurdo Sound and the Ross Sea, Antarctica. The phocid hearts were characteristically broader and flatter than those of other carnivore families and they tended toward bifid apices. The heart form indices (height/circumference) averaged 31.5 compared to 39.0 for felids. The right ventricular chambers of the Antarctic seals were found to average longer in Weddells and narrower in all, than those reported for four other carnivore families. An elastic enlargement was present in the ascending aortae of all seals. The largest diameter of the aortic bulb averaged 25.5 mm more than the base of the aorta in the adult Weddell seals which represented an increase of 72.5% over the base. It is suggested that the general heart form, and especially the ascending aortae, are anatomical adaptations to diving. The compressed heart makes possible unimpaired function when the chest is compressed during deep dives. The aortic bulb maintains mean arterial blood pressure and perfusion of the brain and cardiac tissue during diving bradycardia. |
format |
Article in Journal/Newspaper |
author |
Drabek, Charles M. |
spellingShingle |
Drabek, Charles M. Some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving |
author_facet |
Drabek, Charles M. |
author_sort |
Drabek, Charles M. |
title |
Some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving |
title_short |
Some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving |
title_full |
Some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving |
title_fullStr |
Some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving |
title_full_unstemmed |
Some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving |
title_sort |
some anatomical aspects of the cardiovascular system of antarctic seals and their possible functional significance in diving |
publisher |
Wiley |
publishDate |
1975 |
url |
http://dx.doi.org/10.1002/jmor.1051450106 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjmor.1051450106 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jmor.1051450106 |
long_lat |
ENVELOPE(-61.626,-61.626,-64.145,-64.145) |
geographic |
Antarctic Hydrurga McMurdo Sound Ross Sea The Antarctic Weddell |
geographic_facet |
Antarctic Hydrurga McMurdo Sound Ross Sea The Antarctic Weddell |
genre |
Antarc* Antarctic Antarctica Crabeater Seals Hydrurga leptonyx Leopard Seal Leptonychotes weddelli Lobodon carcinophagus McMurdo Sound Ommatophoca rossi Ross Sea Weddell Seal Weddell Seals |
genre_facet |
Antarc* Antarctic Antarctica Crabeater Seals Hydrurga leptonyx Leopard Seal Leptonychotes weddelli Lobodon carcinophagus McMurdo Sound Ommatophoca rossi Ross Sea Weddell Seal Weddell Seals |
op_source |
Journal of Morphology volume 145, issue 1, page 85-105 ISSN 0362-2525 1097-4687 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jmor.1051450106 |
container_title |
Journal of Morphology |
container_volume |
145 |
container_issue |
1 |
container_start_page |
85 |
op_container_end_page |
105 |
_version_ |
1802647095084056576 |