Biphasic Allometry of Cardiac Growth in the Developing Kangaroo Macropus fuliginosus

Physiological and Biochemical Zoology : PBZ
Edward P SnellingRoger S Seymour

Abstract

Interspecific studies of adult mammals show that heart mass (M(h), g) increases in direct proportion to body mass (M(b), kg), such that M(h) ∝ M(b)(1.00). However, intraspecific studies on heart mass in mammals at different stages of development reveal considerable variation between species, M(h) ∝ M(b)(0.70-1.00). Part of this variation may arise as a result of the narrow body size range of growing placental mammals, from birth to adulthood. Marsupial mammals are born relatively small and offer an opportunity to examine the ontogeny of heart mass over a much broader body size range. Data from 29 western grey kangaroos Macropus fuliginosus spanning 800-fold in body mass (0.084-67.5 kg) reveal the exponent for heart mass decreases significantly when the joey leaves the pouch (ca. 5-6 kg body mass). In the pouch, the heart mass of joeys scales with hyperallometry, M(h(in-pouch)) = 6.39 M(b)(1.10 ± 0.05), whereas in free-roaming juveniles and adults, heart mass scales with hypoallometry, M(h(postpouch)) = 14.2 Mb(0.77 ± 0.08). Measurements of heart height, width, and depth support this finding. The relatively steep heart growth allometry during in-pouch development is consistent with the increase in relative cardiac demands as joe...Continue Reading

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Citations

May 14, 2016·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Gary C Packard
Jul 13, 2018·The Journal of Experimental Biology·Edward P SnellingRoger S Seymour
Oct 27, 2018·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·John EmeRuth M Elsey
Oct 16, 2019·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Brandon C MooreThomas R Rainwater
Apr 18, 2019·Journal of Anatomy·Edward P SnellingTilaye Wube
Aug 1, 2020·Journal of Anatomy·Gary C Packard
Jan 24, 2020·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Sarah L AldermanTodd E Gillis
Jan 26, 2021·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Adam J MunnRoger S Seymour
Apr 25, 2015·The Journal of Experimental Biology·Edward P SnellingRoger S Seymour
Jun 5, 2021·The Journal of Experimental Biology·Douglas S Glazier

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