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dc.contributor.authorFahlman, Andreas
dc.contributor.authorCozzi, Bruno
dc.contributor.authorManley, Mercy
dc.contributor.authorJabas, Sandra
dc.contributor.authorMalik, Marek
dc.contributor.authorBlawas, Ashley
dc.contributor.authorJanik, Vincent M.
dc.identifier.citationFahlman , A , Cozzi , B , Manley , M , Jabas , S , Malik , M , Blawas , A & Janik , V M 2020 , ' Conditioned variation in heart rate during static breath-holds in the bottlenose dolphin ( Tursiops truncatus ) ' , Frontiers in Physiology , vol. 11 , 604018 .
dc.identifier.otherPURE: 268335146
dc.identifier.otherPURE UUID: 295e82d8-25bf-4ef5-b99d-1bc1001ab353
dc.identifier.otherORCID: /0000-0001-7894-0121/work/84315411
dc.identifier.otherScopus: 85097348104
dc.identifier.otherWOS: 000596357800001
dc.descriptionFunding for this project was provided by the Office of Naval Research to AF (ONR Award # N00014-16-1-3088).en
dc.description.abstractPrevious reports suggested the existence of direct somatic motor control over heart rate (fH) responses during diving in some marine mammals, as the result of a cognitive and/or learning process rather than being a reflexive response. This would be beneficial for O2 storage management, but would also allow ventilation-perfusion matching for selective gas exchange, where O2 and CO2 can be exchanged with minimal exchange of N2. Such a mechanism explains how air breathing marine vertebrates avoid diving related gas bubble formation during repeated dives, and how stress could interrupt this mechanism and cause excessive N2 exchange. To investigate the conditioned response, we measured the fH-response before and during static breath-holds in three bottlenose dolphins (Tursiops truncatus) when shown a visual symbol to perform either a long (LONG) or short (SHORT) breath-hold, or during a spontaneous breath-hold without a symbol (NS). The average fH (ifHstart), and the rate of change in fH (difH/dt) during the first 20 s of the breath-hold differed between breath-hold types. In addition, the minimum instantaneous fH (ifHmin), and the average instantaneous fH during the last 10 s (ifHend) also differed between breath-hold types. The difH/dt was greater, and the ifHstart, ifHmin, and ifHend were lower during a LONG as compared with either a SHORT, or an NS breath-hold (P < 0.05). Even though the NS breath-hold dives were longer in duration as compared with SHORT breath-hold dives, the difH/dt was greater and the ifHstart, ifHmin, and ifHend were lower during the latter (P < 0.05). In addition, when the dolphin determined the breath-hold duration (NS), the fH was more variable within and between individuals and trials, suggesting a conditioned capacity to adjust the fH-response. These results suggest that dolphins have the capacity to selectively alter the fH-response during diving and provide evidence for significant cardiovascular plasticity in dolphins.
dc.relation.ispartofFrontiers in Physiologyen
dc.rightsCopyright © 2020 Fahlman, Cozzi, Manley, Jabas, Malik, Blawas and Janik. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en
dc.subjectDive responseen
dc.subjectDiving physiologyen
dc.subjectMarine mammalen
dc.subjectCardiovascular physiologyen
dc.subjectQH301 Biologyen
dc.subjectSDG 14 - Life Below Wateren
dc.titleConditioned variation in heart rate during static breath-holds in the bottlenose dolphin (Tursiops truncatus)en
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. Sea Mammal Research Uniten
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. Institute of Behavioural and Neural Sciencesen
dc.contributor.institutionUniversity of St Andrews. Centre for Social Learning & Cognitive Evolutionen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Bioacoustics groupen
dc.description.statusPeer revieweden

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