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Body mass and extinction risk in Australian marsupials: The 'Critical Weight Range' revisited

Citation

Johnson, CN and Isaac, JL, Body mass and extinction risk in Australian marsupials: The 'Critical Weight Range' revisited , Austral Ecology, 34, (1) pp. 35-40. ISSN 1442-9985 (2009) [Refereed Article]


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The definitive published version is available online at: http://www.interscience.wiley.com

DOI: doi:10.1111/j.1442-9993.2008.01878.x

Abstract

Australian mammals have suffered an exceptionally high rate of decline and extinction over the last two hundred years. Body mass is linked to extinction risk in Australian mammals, but the nature of this association is controversial. A widely held view is that species of intermediate body mass (between 35 and 5500 g, the ‘critical weight range’, CWR) have declined most severely. However, the existence of the CWR has been disputed. In this paper we clarify the relationship of decline status and body mass in Australian marsupials. We show that the form of this relationship differs for ground-living versus arboreal species, and for species from low versus high rainfall areas. Among ground-living species and those from low-rainfall areas, declines were strongly size-selective and concentrated on species within the CWR. For the remaining species, decline was only weakly related to body mass with no evidence of heightened risk for species of intermediate size. We conclude that for terrestrial species in low rainfall areas, species within the CWR are most at risk of decline and extinction.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Population Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Flora, Fauna and Biodiversity at Regional or Larger Scales
Author:Johnson, CN (Professor Christopher Johnson)
ID Code:72237
Year Published:2009
Web of Science® Times Cited:64
Deposited By:Zoology
Deposited On:2011-08-24
Last Modified:2011-09-09
Downloads:4 View Download Statistics

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