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

ABSTRACT: 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 O₂ 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 )·breathing frequency (f_R ), as well as cardiac output, that

SUBMITTER: He RS 

PROVIDER: S-EPMC10239733 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature