Australian Mammalogy Australian Mammalogy Society
Journal of the Australian Mammal Society

The effects of drought on prey selection of the barn owl (Tyto alba) in the Strzelecki Regional Reserve, north-eastern South Australia

Matthew C. McDowell A B and Graham C. Medlin A

A Mammal Section, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.

B School of Biological Science, Flinders University of South Australia, PO Box 1200, Adelaide, SA 5000, Australia.

Australian Mammalogy 31(1) 47-55
Submitted: 24 November 2008  Accepted: 21 March 2009   Published: 16 April 2009


Changes in the diet of the barn owl (Tyto alba) were determined by analysing 619 egested pellets collected in eight samples over 12 months from a roost in the Strzelecki Regional Reserve, north-eastern South Australia. These data were used to examine the occurrence and change in frequency of small vertebrates in the region. In January 2003, at the end of a prolonged dry period, reptiles (predominantly geckos) dominated the diet of the barn owl, forming over 74% of Prey Units (PU%). This is the first Australian study to report reptiles as the primary prey of the barn owl. After substantial rain in February 2003, mammalian prey became much more common, and eventually accounted for almost 80 PU%. At least nine species of small mammal, at least four reptiles, nine birds and a frog were identified from the pellets. Mammalian prey included Leggadina forresti, Mus musculus, Notomys fuscus (endangered), Pseudomys desertor (not previously recorded in the reserve), P. hermannsburgensis, Planigale gilesi, Sminthopsis crassicaudata, S. macroura and Tadarida australis. This research showed that barn owls are capable of switching to alternative prey when mammals become rare, but that they return to preferred prey as soon as it becomes available.


Allen C. R. Saunders D. A. 2002 Variability between scales: predictors of nomadism in birds of an Australian Mediterranean-climate ecosystem. Ecosystems 5 348 359

Andrews P. (1990). ‘Owls, Caves and Fossils.’ (University of Chicago Press: Chicago.)

BOM (2007). ‘The Australian Data Archive of Meteorology.’ (Bureau of Meteorology, South Australian Regional Office-Climate Services Section: Adelaide.)

Cogger H. G. (1992). ‘Reptiles and Amphibians of Australia.’ (Reed: Sydney.)

DEH (2002). A review of Lake Frome and Strzelecki Regional Reserves 1991–2001. Department for Environment and Heritage, Adelaide.

Dickman C. R. Predavec M. Lynam A. J. 1991 Differential predation of size and sex classes of mice by the barn owl, Tyto alba. Oikos 62 67 76

Dickman C. R. Mahon P. S. Masters P. Gibson D. F. 1999 Long-term dynamics of rodent populations in arid Australia: the influence of rainfall. Wildlife Research 26 389 403 doi:10.1071/WR97057

Dickman C. R. Haythornthwaite A. S. McNaught G. H. Mahon P. S. Tamayo B. Letnic M. 2001 Population dynamics of three species of dasyurid marsupials in arid central Australia: a 10-year study. Wildlife Research 28 493 506 doi:10.1071/WR00023

Errington P. L. 1930 The pellet analysis method of raptor food habits study. The Condor 32 292 296 doi:10.2307/1363377

Finlayson H. H. 1939 On mammals from the Lake Eyre Basin, Part V. General remarks on the increase of murids and their population movements in the Lake Eyre Basin during the years 1930–1936. Transactions of the Royal Society of South Australia 63 348 353

Finlayson H. H. 1941 On central Australian mammals. Part II. The Muridae. Transactions of the Royal Society of South Australia 65 215 232

Finlayson H. H. 1961 On central Australian mammals. Part IV. The distribution and status of central Australian species. Records of the South Australian Museum 14 141 191

Fisher A. K. 1896 Food of the barn owl (Strix pratincola). Science 3 624 625

Granjon L. Traoré M. 2007 Prey selection by barn owls in relation to small-mammal community and population structure in a Sahelian agro-ecosystem. Journal of Tropical Ecology 23 199 208 doi:10.1017/S026646740600383X

Griffiths D. 1975 Prey availability and the food of predators. Ecology 56 1209 1214 doi:10.2307/1936161

Hammer Ø. , Harper D. A. T. , and Ryan P. D. (2001). Past: Paleontological statistics software package for education and data analysis. Palaeontologica Electronica 4(1). Online <>.

Heywood M. R. Pavey C. R. 2002 Relative importance of plague rodents and dasyurids as prey of barn owls in central Australia. Wildlife Research 29 203 207 doi:10.1071/WR01104

Higgins P. J. (Ed.) (1999). ‘Handbook of Australian, New Zealand and Antarctic Birds. Vol. 4: Parrots and Dollarbirds.’ (Oxford University Press: Melbourne.)

Higgins P. J. , and Peter J. M. (Eds) (2003). ‘Handbook of Australian, New Zealand and Antarctic Birds. Vol. 6: Pardalotes to Shrike-thrushes.’ (Oxford University Press: Melbourne.)

Higgins P. J. , Peter J. M. , and Steele W. K. (Eds) (2001). ‘Handbook of Australian, New Zealand and Antarctic Birds. Vol. 5: Tyrant-flycatchers to Chats.’ (Oxford University Press: Melbourne.)

Higgins P. J. , Peter J. M. , and Cowling S. J. (Eds) (2006). ‘Handbook of Australian, New Zealand and Antarctic Birds. Vol. 7: Boatbill to Starlings.’ (Oxford University Press: Mebourne.)

Hollands D. (1991). ‘Birds of the Night: Owls, Frogmouths and Nightjars of Australia.’ (Reed Books: Sydney.)

Kitchener D. J. Cooper N. Bradley A. 1986 Reproduction in male Ningaui (Marsupialia: Dasyuridae). Australian Wildlife Research 13 13 25 doi:10.1071/WR9860013

Kotler B. P. 1984 Risk of predation and the structure of desert rodent communities. Ecology 65 689 701 doi:10.2307/1938041

Kotler B. P. Brown J. S. Mitchell W. A. 1994 The role of predation in shaping the behaviour, morphology and community organisation of desert rodents. Australian Journal of Zoology 42 449 466 doi:10.1071/ZO9940449

Kutt A. S. Thurgate N. Y. Hannah D. S. 2004 Distribution and habitat of the desert mouse (Pseudomys desertor) in Queensland. Wildlife Research 31 129 142 doi:10.1071/WR02005

Laut P. , Keig G. , Lazarides M. , Loffler E. , Margules C. , Scott R. M. , and Sullivan M. E. (1977). ‘Environments of South Australia. Province 8: Northern Arid.’ (Division of Land Use Research Commonwealth Scientific and Industrial Research Organization: Canberra.)

Letnic M. Dickman C. R. 2006 Boom means bust: interactions between the El Niño/Southern Oscillation (ENSO), rainfall and the processes threatening mammal species in arid Australia. Biodiversity and Conservation 15 3847 3880 doi:10.1007/s10531-005-0601-2

Lidicker W. Z. 1966 Ecological observations on a feral house mouse population declining to extinction. Ecological Monographs 36 27 50 doi:10.2307/1948487

Lyman R. L. Power E. Lyman R. J. 2003 Quantification and sampling of faunal remains in owl pellets. Journal of Taphonomy 1 3 14

Marchant S. , Higgins P. J. , and Davies J. N. (Eds) (1994). ‘Handbook of Australian, New Zealand and Antarctic Birds. Vol. 2: Raptors to Lapwings.’ (Oxford University Press: Melbourne.)

Morton S. R. 1974 First record of Forrest’s mouse Leggadina forresti (Thomas, 1906) in N.S.W. Victorian Naturalist 91 92 94

Morton S. R. 1978 An ecological study of Sminthopsis crassicaudata (Marsupialia: Dasyuridae). III. Reproduction and life history. Australian Wildlife Research 5 183 211

Morton S. R. (1995 a). Fat-tailed dunnart, Sminthopsis crassicaudata. In ‘The Mammals of Australia’. (Ed. R. Strahan.) pp. 129–131. (Reed Books: Sydney.)

Morton S. R. (1995 b). Stripe-faced dunnart, Sminthopsis macroura. In ‘The Mammals of Australia’. (Ed. R. Strahan.) pp. 148–149. (Reed Books: Sydney.)

Morton S. R. Martin A. A. 1979 Feeding ecology of the barn owl, Tyto alba, in arid southern Australia. Australian Wildlife Research 6 191 204 doi:10.1071/WR9790191

Moseby K. E. Brandle R. Adams M. 1999 Distribution, habitat and conservation status of the rare dusky hopping-mouse, Notomys fuscus (Rodentia: Muridae). Wildlife Research 26 479 494 doi:10.1071/WR97061

Newsome A. E. , and Corbett L. K. (1975). Outbreaks of rodents in semi-arid and arid Australia: causes, preventions, and evolutionary considerations. In ‘Rodents in Desert Environments’. (Eds I. Prakash and P. K. Ghosh.) pp. 117–153. (Junk: The Hague.)

NPWS (2002). Forrest’s mouse (Leggadina forresti) and sandy inland mouse (Pseudomys hermannsburgensis) recovery plan. NSW National Parks and Wildlife Service, Hurstville, NSW.

Pavey C. R. Gorman J. Heywood M. 2008 Dietary overlap between the nocturnal letter-winged kite Elanus scriptus and barn owl Tyto alba during a rodent outbreak in arid Australia. Journal of Arid Environments 72 2282 2286 doi:10.1016/j.jaridenv.2008.07.013

Read D. G. (1995). Giles’ planigale Planigale gilesi. In ‘The Mammals of Australia’. (Ed. R. Strahan.) pp. 107–109. (Reed Books: Sydney.)

Read J. L. 1992 Influence of habitats, climate, grazing and mining on the small terrestrial vertebrates at Olympic Dam, South Australia. The Rangeland Journal 14 143 156 doi:10.1071/RJ9920143

Read J. Copley P. Bird P. 1999 The distribution, ecology and current status of Pseudomys desertor in South Australia. Wildlife Research 26 453 462 doi:10.1071/WR97051

Reid J. , and Gillen J. (1988). The Coongie Lakes Study. Consultancy to the Department of Environment and Planning, Adelaide.

Robinson A. C. , Casperson K. D. , and Hutchinson M. N. (Eds) (2000). ‘A List of the Vertebrates of South Australia.’ (Department for Environment and Heritage: Adelaide.)

Schoener T. W. 1971 Theory of feeding strategies. Annual Review of Ecology and Systematics 2 369 404 doi:10.1146/

Siegel S. , and Castellan N. J. (1988). ‘Nonparametric Statistics for the Behavioural Sciences.’ (McGraw-Hill Inc.: New York.)

Smith J. D. B. Cole J. 1989 Diet of the barn owl, Tyto alba, in the Tanami Desert, Northern Territory. Australian Wildlife Research 16 611 624 doi:10.1071/WR9890611

Strahan R. (Ed.) (1995). ‘The Mammals of Australia.’ (Reed Books: Sydney.)

Torre I. Arrizabalaga A. Flaquer C. 2004 Three methods for assessing richness and composition of small mammal communities. Journal of Mammalogy 85 524 530 doi:10.1644/BJK-112

Vukićević-Radić O. Jovanović T. B. Matić R. Kataranovski D. 2005 Age structure of yellow-necked mouse (Apodemus flavicollis Melchior, 1834) in two samples obtained from live traps and owl pellets. Archives of Biological Sciences (Belgrade) 57 53 56 doi:10.2298/ABS0501053V

Watts C. H. S. , and Aslin H. J. (1981). ‘The Rodents of Australia.’ (Angus and Robertson Publishers: Australia.)

Yom-Tov Y. 1985 The reproductive rates of Australian rodents. Oecologia 66 250 255

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