Drivers of the dive response in trained harbour porpoises (Phocoena phocoena)
Pronounced dive responses through peripheral vasoconstriction and bradycardia enable prolonged apnoea in marine mammals. For most vertebrates, the dive response is initiated upon face immersion, but little is known about the physical drivers of diving and surfacing heart rate in cetaceans whose face...
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fthighwire:oai:open-archive.highwire.org:jexbio:222/19/jeb208637 2023-05-15T17:59:11+02:00 Drivers of the dive response in trained harbour porpoises (Phocoena phocoena) Elmegaard, Siri L. McDonald, Birgitte I. Madsen, Peter T. 2019-10-02 00:40:36.0 text/html http://jeb.biologists.org/cgi/content/short/222/19/jeb208637 https://doi.org/10.1242/jeb.208637 en eng The Company of Biologists Ltd http://jeb.biologists.org/cgi/content/short/222/19/jeb208637 http://dx.doi.org/10.1242/jeb.208637 Copyright (C) 2019, Company of Biologists SHORT COMMUNICATION TEXT 2019 fthighwire https://doi.org/10.1242/jeb.208637 2019-10-27T07:03:41Z Pronounced dive responses through peripheral vasoconstriction and bradycardia enable prolonged apnoea in marine mammals. For most vertebrates, the dive response is initiated upon face immersion, but little is known about the physical drivers of diving and surfacing heart rate in cetaceans whose faces are always mostly submerged. Using two trained harbour porpoises instrumented with an ECG-measuring sound-and-movement tag (DTAG-3), we investigated the initiation and progression of bradycardia and tachycardia during apnoea and eupnoea for varying levels of immersion. We show that paranasal wetting drives bradycardia initiation and progression, whereas apnoea leads to dive-level bradycardia eventually, but not instantly. At the end of dives, heart rate accelerates independently of lung expansion, perhaps in anticipation of surfacing; however, full tachycardia is only engaged upon inhalation. We conclude that breathing drives surface tachycardia, whereas blowhole wetting is an important driver of bradycardia; however, anticipatory/volitional modulation can overrule such responses to sensory inputs. Text Phocoena phocoena HighWire Press (Stanford University) Journal of Experimental Biology |
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HighWire Press (Stanford University) |
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English |
topic |
SHORT COMMUNICATION |
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SHORT COMMUNICATION Elmegaard, Siri L. McDonald, Birgitte I. Madsen, Peter T. Drivers of the dive response in trained harbour porpoises (Phocoena phocoena) |
topic_facet |
SHORT COMMUNICATION |
description |
Pronounced dive responses through peripheral vasoconstriction and bradycardia enable prolonged apnoea in marine mammals. For most vertebrates, the dive response is initiated upon face immersion, but little is known about the physical drivers of diving and surfacing heart rate in cetaceans whose faces are always mostly submerged. Using two trained harbour porpoises instrumented with an ECG-measuring sound-and-movement tag (DTAG-3), we investigated the initiation and progression of bradycardia and tachycardia during apnoea and eupnoea for varying levels of immersion. We show that paranasal wetting drives bradycardia initiation and progression, whereas apnoea leads to dive-level bradycardia eventually, but not instantly. At the end of dives, heart rate accelerates independently of lung expansion, perhaps in anticipation of surfacing; however, full tachycardia is only engaged upon inhalation. We conclude that breathing drives surface tachycardia, whereas blowhole wetting is an important driver of bradycardia; however, anticipatory/volitional modulation can overrule such responses to sensory inputs. |
format |
Text |
author |
Elmegaard, Siri L. McDonald, Birgitte I. Madsen, Peter T. |
author_facet |
Elmegaard, Siri L. McDonald, Birgitte I. Madsen, Peter T. |
author_sort |
Elmegaard, Siri L. |
title |
Drivers of the dive response in trained harbour porpoises (Phocoena phocoena) |
title_short |
Drivers of the dive response in trained harbour porpoises (Phocoena phocoena) |
title_full |
Drivers of the dive response in trained harbour porpoises (Phocoena phocoena) |
title_fullStr |
Drivers of the dive response in trained harbour porpoises (Phocoena phocoena) |
title_full_unstemmed |
Drivers of the dive response in trained harbour porpoises (Phocoena phocoena) |
title_sort |
drivers of the dive response in trained harbour porpoises (phocoena phocoena) |
publisher |
The Company of Biologists Ltd |
publishDate |
2019 |
url |
http://jeb.biologists.org/cgi/content/short/222/19/jeb208637 https://doi.org/10.1242/jeb.208637 |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_relation |
http://jeb.biologists.org/cgi/content/short/222/19/jeb208637 http://dx.doi.org/10.1242/jeb.208637 |
op_rights |
Copyright (C) 2019, Company of Biologists |
op_doi |
https://doi.org/10.1242/jeb.208637 |
container_title |
Journal of Experimental Biology |
_version_ |
1766167945716695040 |