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Resting metabolic rate and lung function in fasted and fed rough-toothed dolphins, Steno bredanensis
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, Faculty of Science & Engineering. Global Diving Res SL, Spain; Fdn Oceanograf Comun Valenciana, Spain; Kolmarden Wildlife Pk, Sweden; Global Diving Res SL, Spain.
Clearwater Marine Aquarium, FL USA.
Clearwater Marine Aquarium, FL USA.
Clearwater Marine Aquarium, FL USA.
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2024 (English)In: Marine mammal science, ISSN 0824-0469, E-ISSN 1748-7692, Vol. 40, no 1, p. 210-221Article in journal (Refereed) Published
Abstract [en]

We measured resting metabolic rate (RMR), tidal volume (V-T), breathing frequency (f(R)), respiratory flow, and endexpired gases in rough-toothed dolphins (Steno bredanensis) housed in managed care after an overnight fast and 1-2 hr following a meal. The measured average (+/- standard deviation) V-T (4.0 +/- 1.3 L) and f(R) (1.9 +/- 1.0 breaths/min) were higher and lower, respectively, as compared with estimated values from both terrestrial and aquatic mammals, and the average V-T was 43% of the estimated total lung capacity. The end-expired gas levels suggested that this species keep alveolar O-2 (10.6% or 80 mmHg) and CO2 (7.6% or 57 mmHg), and likely arterial gas tensions, low and high, respectively, to maximize efficiency of gas exchange. We show that following an overnight fast, the RMR (566 +/- 158 ml O-2/min) was 1.8 times the estimated value predicted by Kleiber for terrestrial mammals of the same size. We also show that between 1 and 2 hr after ingestion of a meal, the metabolic rate increases an average of 29% (709 +/- 126 ml O-2/min). Both body mass (M-b) and f(R) significantly altered the measured RMR and we propose that both these variables should be measured when estimating energy use in cetaceans.

Place, publisher, year, edition, pages
WILEY , 2024. Vol. 40, no 1, p. 210-221
Keywords [en]
diving physiology; energetics; field metabolic rate; lung mechanics; marine mammals; pulmonary function test; spirometry; total lung capacity
National Category
Zoology
Identifiers
URN: urn:nbn:se:liu:diva-198674DOI: 10.1111/mms.13068ISI: 001068954600001OAI: oai:DiVA.org:liu-198674DiVA, id: diva2:1806662
Note

Funding Agencies|A special thanks to the many volunteers and staff at Clearwater Marine Aquarium and Gulf World for making these measurements possible. A special thanks to Ellen Leonard, Mel Mason, Beth Schumacher, Hailee Crocket, Rhegan Shields, and Kodi Underwood at Gulf [2022-06]; research department of the Dolphin Company [2023-01]; Animal Care Committee of Fundacion Oceanografic

Available from: 2023-10-23 Created: 2023-10-23 Last updated: 2024-03-28

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