Indiscriminate feeding by an alien population of the spotted-thighed frog (Litoria cyclorhyncha) in southern Australia and potential impacts on native biodiversity
Christine M. Taylor
A E , Gunnar Keppel A B , Shaun O’Sullivan C , Stefan Peters A , Gregory D. Kerr D and Craig R. Williams C
+ Author Affiliations
- Author Affiliations
A Natural and Built Environments Research Centre, School of Natural and Built Environments, University of South Australia, GPO Box 2471, Adelaide, SA 5001, Australia.
B Biodiversity, Macroecology and Biogeography, Faculty of Forest Sciences and Forest Ecology, University of Goettingen, Büsgenweg 1, 37077 Göttingen, Germany.
C School of Pharmacy and Medical Sciences, University of South Australia, GPO Box 2471, Adelaide, SA 5001, Australia.
D Nature Glenelg Trust, 24 Clarke Street, Hamilton, Vic. 3300, Australia.
E Corresponding author. Email: taycm008@mymail.unisa.edu.au
Australian Journal of Zoology 67(2) 59-72 https://doi.org/10.1071/ZO19042
Submitted: 25 June 2019 Accepted: 4 March 2020 Published: 9 April 2020
Abstract
Litoria cyclorhyncha (Hylidae) is native to southern Western Australia, but a naturalised population has established on the Eyre Peninsula, South Australia. We investigated the diet of this exotic population to assess potential impacts on biodiversity and ecosystems. Seventy-six frogs were collected from three different habitats and their diet items assigned to parataxonomic units (PU) within orders. Stomach contents were diverse, containing 467 prey items from 19 orders and 135 PU, with extrapolation suggesting a diet of ~200 PU. Shannon diversity estimates of prey items consumed produced different rankings for the three habitats at the PU and order level. Therefore, estimates at the order level may not be representative of the actual diversity of prey items. L. cyclorhyncha consumed mainly arthropods and low numbers of conspecific young frogs, geckos and a juvenile house mouse. This generalist, indiscriminate predatory diet is similar to that of other hylids and implies that the species poses a risk to native biodiversity and ecosystem processes by predation and competition. Therefore, further spread of this species needs to be prevented. Our findings can inform effective policies and management actions to mitigate future impacts of L. cyclorhyncha.
Additional keywords: dietary analysis, generalist predator, hylid frogs, invasive amphibian, localised population, parataxonomic unit (PU).
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