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Accepted Manuscript
Research Article
Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
Junichi Okuyama, Maika Shiozawa, Daisuke Shiode
Biology Open 2020 : bio.049247 doi: 10.1242/bio.049247 Published 7 February 2020
Junichi Okuyama
1Research Center for Subtropical Fisheries, Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency, Ishigaki, Okinawa, 907-0451 Japan
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  • ORCID record for Junichi Okuyama
  • For correspondence: jokuyama@affrc.go.jp
Maika Shiozawa
2Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, Minato, Tokyo 108-8477, Japan
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Daisuke Shiode
2Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, Minato, Tokyo 108-8477, Japan
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Abstract

In chelonids, oxygen is primarily stored in the lungs during a dive. Therefore, management of blood oxygen transportation to peripheral tissues by cardiovascular adjustments during submergence is crucial to maximize their dive duration, and consequently, the time spent for ecological activities such as foraging. However, the cardiac response to exercise, has rarely been examined in sea turtles. In this study, heart rate and its relationship with exercise during voluntary dives were determined in six captive green turtles (19.4±1.5 kg) by simultaneously recording depth, acceleration, and electrocardiogram. Our results demonstrated that the heart rate of green turtles was generally low (11.1±0.4 bpm) during resting dives, but they often exhibited instantaneously extreme tachycardia (up to 78.4 bpm). Green turtles elevated their heart rate up to 39.8±1.5 bpm during ventilation after resting dives, while up to 33.1±1.4 bpm after active dives. The heart rate immediately elevated with onset of exercise, and increased linearly with exercise. This result may indicate that turtles immediately need to transport oxygen from the lungs to peripheral tissues by pulmonary and systemic circulations to meet the metabolic demands of exercise because they mainly store oxygen in their lungs.

  • Received November 7, 2019.
  • Accepted January 24, 2020.
  • © 2020. Published by The Company of Biologists Ltd
http://creativecommons.org/licenses/by/4.0

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Keywords

  • Bio-logging
  • Blood flow
  • Chelonia mydas
  • Electrocardiogram (ECG)
  • Diving physiology

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Accepted Manuscript
Research Article
Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
Junichi Okuyama, Maika Shiozawa, Daisuke Shiode
Biology Open 2020 : bio.049247 doi: 10.1242/bio.049247 Published 7 February 2020
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Accepted Manuscript
Research Article
Heart rate and cardiac response to exercise during voluntary dives in captive sea turtles (Cheloniidae)
Junichi Okuyama, Maika Shiozawa, Daisuke Shiode
Biology Open 2020 : bio.049247 doi: 10.1242/bio.049247 Published 7 February 2020

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