Comparative Respiratory Physiology in Cetaceans.

Published on Mar 3, 2020in Frontiers in Physiology4.566
路 DOI :10.3389/FPHYS.2020.00142
Andreas Fahlman30
Estimated H-index: 30
,
Alicia Borque-Espinosa4
Estimated H-index: 4
(University of Valencia)
+ 4 AuthorsJulie Rocho-Levine10
Estimated H-index: 10
Sources
Abstract
In the current study, we used breath-by-breath respirometry to evaluate respiratory physiology under voluntary control in a male beluga calf [Delphinapterus leucas, body mass range (M b): 151-175 kg], an adult female (estimated M b = 500-550 kg) and a juvenile male (M b = 279 kg) false killer whale (Pseudorca crassidens) housed in managed care. Our results suggest that the measured breathing frequency (f R) is lower, while tidal volume (V T) is significantly greater as compared with allometric predictions from terrestrial mammals. Including previously published data from adult bottlenose dolphin (Tursiops truncatus) beluga, harbor porpoise (Phocoena phocoena), killer whale (Orcinus orca), pilot whale (Globicephala scammoni), and gray whale (Eschrichtius robustus) show that the allometric mass-exponents for V T and f R are similar to that for terrestrial mammals (V T: 1.00, f R: -0.20). In addition, our results suggest an allometric relationship for respiratory flow ( V . ), with a mass-exponent between 0.63 and 0.70, and where the expiratory V . was an average 30% higher as compared with inspiratory V . . These data provide enhanced understanding of the respiratory physiology of cetaceans and are useful to provide proxies of lung function to better understand lung health or physiological limitations.
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Assessment of the compressibility of marine mammal airways at depth is crucial to understanding vital physiologic processes such as gas exchange during diving. Very few studies have directly assessed changes in cetacean and pinniped trachea-bronchial shape, and none have quantified changes in volume with increasing pressure. A freshly deceased harbor seal, grey seal, harp seal, harbor porpoise, and common dolphin were imaged post mortem via CT in a radiolucent hyperbaric chamber as previously de...
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Diving mammals have evolved a suite of physiological adaptations to manage respiratory gases during extended breath-hold dives. To test the hypothesis that offshore bottlenose dolphins have evolved physiological adaptations to improve their ability for extended deep dives and as protection for lung barotrauma, we investigated the lung function and respiratory physiology of 4 wild common bottlenose dolphins (Tursiops truncatus) near the island of Bermuda. We measured blood haematocrit (Hct, %), r...
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We measured respiratory flow rates, and expired O 2 in 32 (2鈥34 years, body mass [ M b ] range: 73鈥291鈥卥g) common bottlenose dolphins ( Tursiops truncatus ) during voluntary breaths on land or in water (between 2014 and 2017). The data were used to measure the resting O 2 consumption rate ( V 藱 O 2 , range: 0.76鈥9.45鈥卪l O 2 min 鈭1 kg 鈭1 ) and tidal volume ( V T , range: 2.2鈥10.4鈥卨) during rest. For adult dolphins, the resting V T , but not V 藱 O 2 , correlated with body mass ( M b , range: 141鈥2...
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