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Dietary partitioning of Australia's two marsupial hypercarnivores, the Tasmania devil and the spotted-tailed quoll, across their shared distributional range

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Anderson, GE, Johnson, CN ORCID: 0000-0002-9719-3771, Barmuta, LA ORCID: 0000-0002-8946-3727 and Jones, ME ORCID: 0000-0001-7558-9022 2017 , 'Dietary partitioning of Australia's two marsupial hypercarnivores, the Tasmania devil and the spotted-tailed quoll, across their shared distributional range' , PLoS One, vol. 12, no. 11 , pp. 1-16 , doi: 10.1371/journal.pone.0188529.

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Abstract

Australia’s native marsupial fauna has just two primarily flesh-eating ‘hypercarnivores’, the Tasmanian devil (Sarcophilus harrisii) and the spotted-tailed quoll (Dasyurus maculatus) which coexist only on the island of Tasmania. Devil populations are currently declining due to a fatal transmissible cancer. Our aim was to analyse the diet of both species across their range in Tasmania, as a basis for understanding how devil decline might affect the abundance and distribution of quolls through release from competition. We used faecal analysis to describe diets of one or both species at 13 sites across Tasmania. We compared diet composition and breadth between the two species, and tested for geographic patterns in diets related to rainfall and devil population decline. Dietary items were classified into 6 broad categories: large mammals (≥ 7.0kg), medium-sized mammals (0.5–6.9kg), small mammals (Thylogale billardierii), followed by large mammals (mainly Bennett’s wallaby Macropus rufogriseus) and birds, were the most important prey groups for both species. Diet composition varied across sites, suggesting that both species are flexible and opportunistic foragers, but was not related to rainfall for devils. Quolls included more large mammals but fewer small mammals and invertebrates in their diet in the eastern drier parts of Tasmania where devils have declined. This suggests that a competitive release of quolls may have occurred and the substantial decline of devils has provided more food in the large-mammal category for quolls, perhaps as increased scavenging opportunities. The high diet overlap suggests that if resources become limited in areas of high devil density, interspecific competition could occur.

Item Type: Article
Authors/Creators:Anderson, GE and Johnson, CN and Barmuta, LA and Jones, ME
Keywords: trophic ecology, mesopredator release, competition, Dasyurus, Sarcophilus
Journal or Publication Title: PLoS One
Publisher: Public Library of Science
ISSN: 1932-6203
DOI / ID Number: 10.1371/journal.pone.0188529
Copyright Information:

Copyright 2017 Andersen et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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