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Article << Previous     |         Contents Vol 54(4)

Ecological and evolutionary significance of sizes of giant extinct kangaroos

Kristofer M. Helgen A B C, Rod T. Wells D, Benjamin P. Kear B C, Wayne R. Gerdtz E, Timothy F. Flannery B F

A Division of Mammals, National Museum of Natural History, Smithsonian Institution, NHB 390, MRC 108, PO Box 37012, Washington, DC 20013-7012, USA.
B South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.
C School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
D School of Biological Sciences, Flinders University of South Australia, Adelaide, SA 5001, Australia.
E School of Ecology and Environment, Deakin University, Melbourne Campus, Burwood, Vic. 3125, Australia.
F Corresponding author. Email: flannery.tim@saugov.sa.gov.au
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A method, based on femoral circumference, allowed us to develop body mass estimates for 11 extinct Pleistocene megafaunal species of macropodids (Protemnodon anak, P. brehus, P. hopei, P. roechus, Procoptodon goliah, ‘P.’ gilli, Simosthenurus maddocki, S. occidentalis, Sthenurus andersoni, S. stirlingi and S. tindalei) and three fossil populations of the extant eastern grey kangaroo (Macropus giganteus). With the possible exception of P. goliah, the extinct taxa were browsers, among which sympatric, congeneric species sort into size classes separated by body mass increments of 20–75%. None show evidence of size variation through time, and only the smallest (‘P.’ gilli) exhibits evidence suggestive of marked sexual dimorphism. The largest surviving macropodids (five species of Macropus) are grazers which, although sympatric, do not differ greatly in body mass today, but at least one species (M. giganteus) fluctuated markedly in body size over the course of the Pleistocene. Sexual dimorphism in these species is marked, and may have varied through time. There is some mass overlap between the extinct and surviving macropodid taxa. With a mean estimated body mass of 232 kg, Procoptodon goliah was the largest hopping mammal ever to exist.

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