Functional capacities of marsupial hearts: Size and mitochondrial parameters indicate higher aerobic capabilities than generally seen in placental mammals

T. J. Dawson*, K. N. Webster, B. Mifsud, E. Raad, E. Lee, A. D. Needham

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

This study of marsupial hearts explored the aerobic capacities of this group of mammals; recent information suggests that marsupials possess higher aerobic abilities than previously accepted. Characteristics such as heart mass, mitochondrial features and capillary parameters were examined. A comprehensive study of the heart of red kangaroos was included because of the high maximum oxygen consumption of this species. Goats were also included as a reference placental mammal. Marsupials have a heart that is generally larger than that of placentals. The allometric equation for the relationship between heart mass and body mass for marsupials was Mh = 7.5Mb 0.944 (Mh in g and Mb in kg); the equivalent equation for placental mammals was Mh = 6.0Mb 0.97. Mitochondrial volume density and inner mitochondrial surface density do not differ between the two mammal groups; although capillary parameters indicated a lower capillary volume in marsupials. Heart size appears to be the major difference between the two groups. The overall pattern seen in marsupials is similar to that of "athletic" placentals and indicates a relatively high aerobic potential.

Original languageEnglish
Pages (from-to)583-590
Number of pages8
JournalJournal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology
Volume173
Issue number7
DOIs
Publication statusPublished - Sept 2003
Externally publishedYes

Keywords

  • Capillaries
  • Heart mass
  • Kangaroos
  • Marsupials
  • Mitochondria

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