Terrestrial apnoeas and the development of cardiac control in Australian fur seal (Arctocephalus pusillus doriferus) pups
The development of cardiac control in association with terrestrial respiration patterns was examined throughout the period of maternal dependence in Australian fur seal pups. Resting eupnoic heart rate and respiration rate were significantly correlated (r 2 = 0.49) and both decreased with age (P <...
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ftdeakinunifig:oai:figshare.com:article/21032206 2023-05-15T16:05:40+02:00 Terrestrial apnoeas and the development of cardiac control in Australian fur seal (Arctocephalus pusillus doriferus) pups N Deacon John Arnould 2009-04-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30028558 https://figshare.com/articles/journal_contribution/Terrestrial_apnoeas_and_the_development_of_cardiac_control_in_Australian_fur_seal_Arctocephalus_pusillus_doriferus_pups/21032206 unknown http://hdl.handle.net/10536/DRO/DU:30028558 https://figshare.com/articles/journal_contribution/Terrestrial_apnoeas_and_the_development_of_cardiac_control_in_Australian_fur_seal_Arctocephalus_pusillus_doriferus_pups/21032206 All Rights Reserved Physiology Zoology Fur seal Bradycardia Development Science & Technology Life Sciences & Biomedicine NORTHERN ELEPHANT SEALS BODY OXYGEN STORES HEART-RATE DIVING MAMMALS WEDDELL SEALS HARBOR SEALS MIROUNGA-ANGUSTIROSTRIS ZALOPHUS-CALIFORNIANUS PHOCA-VITULINA DIVE BEHAVIOR Text Journal contribution 2009 ftdeakinunifig 2022-11-17T22:37:22Z The development of cardiac control in association with terrestrial respiration patterns was examined throughout the period of maternal dependence in Australian fur seal pups. Resting eupnoic heart rate and respiration rate were significantly correlated (r 2 = 0.49) and both decreased with age (P < 0.05 in both cases). From an early age (1 month), pups displayed terrestrial apnoeas (18.1 ± 0.5 s) accompanied by substantial bradycardia (127 beats min -1 , a 13% decrease from eupnoic HR). Terrestrial apnoea duration increased significantly with age reaching a mean of 41 s just prior to weaning, slightly lower than the mean dive duration (52 s) previously recorded for pups of the same age. Correspondingly, mean apnoic heart rate decreased with age to 74 beats min -1 just prior to weaning, representing a 25% decrease on eupnoic heart rate. Importantly, concomitant with the decrease in mean apnoic heart rate with age, an increase in the control of bradycardia was evident with the variability in instantaneous apnoic heart decreasing such that older pups were able to maintain a low steady heart rate for the duration of the apnoea. The changes seen in these parameters are similar to those reported during postnatal development in elephant seals ( Mirounga spp.) and harbour seals ( Phoca vitulina ), and are considered indicative of the development of cardiac control. These findings suggest a common strategy for the development of bradycardia control in both otariid and phocid seals. Other Non-Article Part of Journal/Newspaper Elephant Seals Phoca vitulina Weddell Seals DRO - Deakin Research Online Weddell |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Physiology Zoology Fur seal Bradycardia Development Science & Technology Life Sciences & Biomedicine NORTHERN ELEPHANT SEALS BODY OXYGEN STORES HEART-RATE DIVING MAMMALS WEDDELL SEALS HARBOR SEALS MIROUNGA-ANGUSTIROSTRIS ZALOPHUS-CALIFORNIANUS PHOCA-VITULINA DIVE BEHAVIOR |
spellingShingle |
Physiology Zoology Fur seal Bradycardia Development Science & Technology Life Sciences & Biomedicine NORTHERN ELEPHANT SEALS BODY OXYGEN STORES HEART-RATE DIVING MAMMALS WEDDELL SEALS HARBOR SEALS MIROUNGA-ANGUSTIROSTRIS ZALOPHUS-CALIFORNIANUS PHOCA-VITULINA DIVE BEHAVIOR N Deacon John Arnould Terrestrial apnoeas and the development of cardiac control in Australian fur seal (Arctocephalus pusillus doriferus) pups |
topic_facet |
Physiology Zoology Fur seal Bradycardia Development Science & Technology Life Sciences & Biomedicine NORTHERN ELEPHANT SEALS BODY OXYGEN STORES HEART-RATE DIVING MAMMALS WEDDELL SEALS HARBOR SEALS MIROUNGA-ANGUSTIROSTRIS ZALOPHUS-CALIFORNIANUS PHOCA-VITULINA DIVE BEHAVIOR |
description |
The development of cardiac control in association with terrestrial respiration patterns was examined throughout the period of maternal dependence in Australian fur seal pups. Resting eupnoic heart rate and respiration rate were significantly correlated (r 2 = 0.49) and both decreased with age (P < 0.05 in both cases). From an early age (1 month), pups displayed terrestrial apnoeas (18.1 ± 0.5 s) accompanied by substantial bradycardia (127 beats min -1 , a 13% decrease from eupnoic HR). Terrestrial apnoea duration increased significantly with age reaching a mean of 41 s just prior to weaning, slightly lower than the mean dive duration (52 s) previously recorded for pups of the same age. Correspondingly, mean apnoic heart rate decreased with age to 74 beats min -1 just prior to weaning, representing a 25% decrease on eupnoic heart rate. Importantly, concomitant with the decrease in mean apnoic heart rate with age, an increase in the control of bradycardia was evident with the variability in instantaneous apnoic heart decreasing such that older pups were able to maintain a low steady heart rate for the duration of the apnoea. The changes seen in these parameters are similar to those reported during postnatal development in elephant seals ( Mirounga spp.) and harbour seals ( Phoca vitulina ), and are considered indicative of the development of cardiac control. These findings suggest a common strategy for the development of bradycardia control in both otariid and phocid seals. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
N Deacon John Arnould |
author_facet |
N Deacon John Arnould |
author_sort |
N Deacon |
title |
Terrestrial apnoeas and the development of cardiac control in Australian fur seal (Arctocephalus pusillus doriferus) pups |
title_short |
Terrestrial apnoeas and the development of cardiac control in Australian fur seal (Arctocephalus pusillus doriferus) pups |
title_full |
Terrestrial apnoeas and the development of cardiac control in Australian fur seal (Arctocephalus pusillus doriferus) pups |
title_fullStr |
Terrestrial apnoeas and the development of cardiac control in Australian fur seal (Arctocephalus pusillus doriferus) pups |
title_full_unstemmed |
Terrestrial apnoeas and the development of cardiac control in Australian fur seal (Arctocephalus pusillus doriferus) pups |
title_sort |
terrestrial apnoeas and the development of cardiac control in australian fur seal (arctocephalus pusillus doriferus) pups |
publishDate |
2009 |
url |
http://hdl.handle.net/10536/DRO/DU:30028558 https://figshare.com/articles/journal_contribution/Terrestrial_apnoeas_and_the_development_of_cardiac_control_in_Australian_fur_seal_Arctocephalus_pusillus_doriferus_pups/21032206 |
geographic |
Weddell |
geographic_facet |
Weddell |
genre |
Elephant Seals Phoca vitulina Weddell Seals |
genre_facet |
Elephant Seals Phoca vitulina Weddell Seals |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30028558 https://figshare.com/articles/journal_contribution/Terrestrial_apnoeas_and_the_development_of_cardiac_control_in_Australian_fur_seal_Arctocephalus_pusillus_doriferus_pups/21032206 |
op_rights |
All Rights Reserved |
_version_ |
1766401571332030464 |