Title

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

Document Type

Journal Article

Publisher

Springer-Verlag

Faculty

Computing, Health and Science

School

School of Natural Sciences

RAS ID

2391

Comments

Originally published as: Dawson, T. J., Webster, K. N., Mifsud, B., Raad, E., Lee, E., & Needham, A. D. (2003). Functional capacities of marsupial hearts: size and mitochondrial parameters indicate higher aerobic capabilities than generally seen in placental mammals. Journal of Comparative Physiology B, 173(7), 583-590. Original article available here

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=7.5Mb0.944 (Mh in g and Mb in kg); the equivalent equation for placental mammals was Mh=6.0Mb0.97. 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.

DOI

10.1007/s00360-003-0368-2

 
COinS
 

Link to publisher version (DOI)

10.1007/s00360-003-0368-2