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dc.contributor.authorIsojunno, Saana
dc.contributor.authorAoki, Kagari
dc.contributor.authorCuré, Charlotte
dc.contributor.authorKvadsheim, Peter
dc.contributor.authorMiller, Patrick
dc.identifier.citationIsojunno , S , Aoki , K , Curé , C , Kvadsheim , P & Miller , P 2018 , ' Breathing patterns indicate cost of exercise during diving and response to experimental sound exposures in long-finned pilot whales ' , Frontiers in Physiology , vol. 9 , 1462 .
dc.identifier.otherPURE: 256010942
dc.identifier.otherPURE UUID: 525e52d1-d32c-42c6-b5dd-a273c9f4ebb7
dc.identifier.otherScopus: 85056138460
dc.identifier.otherORCID: /0000-0002-2212-2135/work/49891133
dc.identifier.otherWOS: 000448241800001
dc.descriptionThis work was funded by NL Ministry of Defence, NOR Ministry of Defence, United States Office of Naval Research (N00014-08-1-0984, N00014-10-1-0355, and N00014-14-1-0390), and FR Ministry of Defence (DGA) (public market n°15860052). KA was supported by the Japan Society for the Promotion of Science Bilateral Open Partnership Joint Research Program.en
dc.description.abstractAir-breathing marine predators that target sub-surface prey have to balance the energetic benefit of foraging against the time, energetic and physiological costs of diving. Here we use on-animal data loggers to assess whether such trade-offs can be revealed by the breathing rates (BR) and timing of breaths in long-finned pilot whales (Globicephela melas). We used the period immediately following foraging dives in particular, for which respiratory behavior can be expected to be optimized for gas exchange. Breath times and fluke strokes were detected using onboard sensors (pressure, 3-axis acceleration) attached to animals using suction cups. The number and timing of breaths were quantified in non-linear mixed models that incorporated serial correlation and individual as a random effect. We found that pilot whales increased their BR in the 5-10min period prior to, and immediately following, dives that exceeded 31m depth. While pre-dive BRs did not vary with dive duration, the initial post-dive BR was linearly correlated with duration of >2 min dives, with BR then declining exponentially. Apparent net diving costs were 1.7 (SE 0.2) breaths per min of diving (post-dive number of breaths, above pre-dive breathing rate unrelated to dive recovery). Every fluke stroke was estimated to cost 0.086 breaths, which amounted to 80-90% average contribution of locomotion to the net diving costs. After accounting for fluke stroke rate, individuals in the small body size class took a greater number of breaths per diving minute. Individuals reduced their breathing rate (from the rate expected by diving behavior) by 13-16% during playbacks of killer whale sounds and their first exposure to 1-2kHz naval sonar, indicating similar responses to interspecific competitor/predator and anthropogenic sounds. Although we cannot rule out individuals increasing their per-breath O2 uptake to match metabolic demand, our results suggest that behavioral responses to experimental sound exposures were not associated with increased metabolic rates in a stress response, but metabolic rates instead appear to decrease. Our results support the hypothesis that maximal performance leads to predictable (optimized) breathing patterns, which combined with further physiological measurements could improve proxies of field metabolic rates and per-stroke energy costs from animal-borne behavior data.
dc.relation.ispartofFrontiers in Physiologyen
dc.rightsCopyright © 2018 Isojunno, Aoki, Curé, Kvadsheim and Miller. 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.subjectAerobic diving limiten
dc.subjectAnthropogenic noiseen
dc.subjectField Metabolic Rate (FMR)en
dc.subjectGlobicephala melasen
dc.subjectRespiratory rateen
dc.subjectQH301 Biologyen
dc.subjectQP Physiologyen
dc.titleBreathing patterns indicate cost of exercise during diving and response to experimental sound exposures in long-finned pilot whalesen
dc.typeJournal articleen
dc.contributor.sponsorOffice of Naval Researchen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. Sea Mammal Research Uniten
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
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. Bioacoustics groupen
dc.description.statusPeer revieweden

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