Allometric scaling of metabolic rate and cardiorespiratory variables in aquatic and terrestrial mammals

While basal metabolic rate (BMR) scales proportionally with body mass (Mb), it remains unclear whether the relationship differs between mammals from aquatic and terrestrial habitats. We hypothesized that differences in BMR allometry would be reflected in similar differences in scaling of O2 delivery...

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Bibliographic Details
Published in:Physiological reports 2023-06, Vol.11 (11), p.e15698-n/a
Main Authors: He, Rebecca S., De Ruiter, Stacy, Westover, Tristan, Somarelli, Jason A., Blawas, Ashley M., Dayanidhi, Divya L., Singh, Ana, Steves, Benjamin, Driesinga, Samantha, Halsey, Lewis G., Fahlman, Andreas
Format: Article
Language:English
Subjects:
Allometry
Animals
Aquatic mammals
basal metabolic rate
Basal Metabolism - physiology
Body mass
breathing frequency
Comparative analysis
Gas exchange
Heart rate
Hemoglobin
Hypotheses
Mammals - metabolism
Metabolic rate
Metabolism
Original
Physiology
Respiration
Small mammals
stroke volume
Tidal Volume
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Summary:While basal metabolic rate (BMR) scales proportionally with body mass (Mb), it remains unclear whether the relationship differs between mammals from aquatic and terrestrial habitats. We hypothesized that differences in BMR allometry would be reflected in similar differences in scaling of O2 delivery pathways through the cardiorespiratory system. We performed a comparative analysis of BMR across 63 mammalian species (20 aquatic, 43 terrestrial) with a Mb range from 10 kg to 5318 kg. Our results revealed elevated BMRs in small (>10 kg and 
ISSN:2051-817X
2051-817X
DOI:10.14814/phy2.15698