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Allometric scaling of metabolic rate and cardiorespiratory variables in aquatic and terrestrial mammals
Duke Univ, NC USA.
Calvin Univ, MI USA.
Duke Univ, NC USA.
Duke Univ, NC USA.
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2023 (English)In: Physiological Reports, E-ISSN 2051-817X, Vol. 11, no 11, article id e15698Article in journal (Refereed) Published
Abstract [en]

While basal metabolic rate (BMR) scales proportionally with body mass (M-b), 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 O-2 delivery pathways through the cardiorespiratory system. We performed a comparative analysis of BMR across 63 mammalian species (20 aquatic, 43 terrestrial) with a M-b range from 10 kg to 5318 kg. Our results revealed elevated BMRs in small (>10 kg and <100 kg) aquatic mammals compared to small terrestrial mammals. The results demonstrated that minute ventilation, that is, tidal volume (V-T)center dot breathing frequency (f(R)), as well as cardiac output, that is, stroke volume center dot heart rate, do not differ between the two habitats. We found that the "aquatic breathing strategy", characterized by higher V-T and lower f(R) resulting in a more effective gas exchange, and by elevated blood hemoglobin concentrations resulting in a higher volume of O-2 for the same volume of blood, supported elevated metabolic requirements in aquatic mammals. The results from this study provide a possible explanation of how differences in gas exchange may serve energy demands in aquatic versus terrestrial mammals.

Place, publisher, year, edition, pages
WILEY , 2023. Vol. 11, no 11, article id e15698
Keywords [en]
basal metabolic rate; body mass; breathing frequency; heart rate; stroke volume; tidal volume
National Category
Physiology
Identifiers
URN: urn:nbn:se:liu:diva-195295DOI: 10.14814/phy2.15698ISI: 000998838800001PubMedID: 37271741OAI: oai:DiVA.org:liu-195295DiVA, id: diva2:1770387
Available from: 2023-06-19 Created: 2023-06-19 Last updated: 2023-11-10

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Citation style
  • apa
  • ieee
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  • oxford
  • Other style
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Language
  • de-DE
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  • en-US
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  • Other locale
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Output format
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