Abstract
Few studies have examined how grazing intensity affects small Australian desert vertebrates, despite the large extent of the grazing industry and its potential effects on native biota. We examined small reptile, amphibian and mammal responses to two intensities (“grazed” and “less-grazed”) of cattle grazing in the stony plains system of arid South Australia. The study was undertaken during wet La Niña conditions when abundance of most species was expected to be highest. Total rainfall over the study period was over twice the mean yearly rainfall. Small vertebrates were sampled with pitfall and Elliott traps. Responses of individual species were compared among three grazed and three less-grazed sites. One agamid species (Ctenophorus gibba) was captured more frequently at grazed sites, and two skink species (Ctenotus olympicus and Menetia greyii) at less-grazed sites. Mus musculus (an exotic mammal) was caught most frequently at grazed sites. No native mammal species responded to grazing intensity. Low-moderate livestock grazing in this study system, during periods of high rainfall, did not have a negative effect on most species studied. Complementary studies should compare responses during drought.
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Acknowledgments
Sincere thanks to the Greenfield family of Billa Kalina for hosting us. Thank you also to our field assistants: Matt Gill, Ali Fairlamb, Hannah Spronk, Cam Forster, Jane Addison, Michael Heath, Kevin Lintern, Katie Ryan, Michael Jervois, Kim McArthur, Kath Hastie, Linda Rennie, Ashley Walker, and Tiffany Godfrey. We are grateful for the assistance of Mark Hutchinson, Cath Kemper, David Stemmer, and Graham Medlin from the South Australian Museum, and to Peggy Rismiller and Mike McKelvey of Pelican Lagoon Wildlife Research Centre. We are indebted to Rob Brandle who helped us locate our study site, and provided advice on working in the SPR. Chris Dickman and Gufu Oba kindly edited an earlier version of the manuscript. Two anonymous reviewers provided valuable comments. This research was funded by the Hermon Slade Foundation, the Holsworth Wildlife Research Endowment, the Nature Conservancy Applied Conservation Award and the Thomas Foundation, the South Australian chapter of the Australian Federation of University Women, the Nature Foundation of South Australia, the Australian Geographic Society, the Royal Geographical Society of South Australia, and the Wildlife Preservation Society of Australia. We acknowledge S. Kidman and Co. and the School of Natural and Built Environments at the University of South Australia for their support. This research was conducted under a National Parks and Wildlife Scientific Permit G25603 2, and ethics approval (72/08) from the Institute of Medical and Veterinary Science Animal Ethics Committee.
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Waudby, H.P., Petit, S. Small Australian desert vertebrate responses to grazing intensity during La Niña. Ecol Res 30, 715–722 (2015). https://doi.org/10.1007/s11284-015-1274-2
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DOI: https://doi.org/10.1007/s11284-015-1274-2