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Australian Mammalogy Australian Mammalogy Society
Journal of the Australian Mammal Society
RESEARCH ARTICLE

Consumption of crops by feral pigs (Sus scrofa) in a fragmented agricultural landscape

Matthew Gentle A C , James Speed A and Darren Marshall B
+ Author Affiliations
- Author Affiliations

A Robert Wicks Pest Animal Research Centre, Biosecurity Queensland, 203 Tor Street, Toowoomba, Qld 4350, Australia.

B Queensland Murray–Darling Committee, 127 Campbell Street, Toowoomba, Qld 4350 Australia.

C Corresponding author. Email: matthew.gentle@daf.qld.gov.au

Australian Mammalogy 37(2) 194-200 https://doi.org/10.1071/AM15003
Submitted: 13 February 2015  Accepted: 14 April 2015   Published: 8 May 2015

Abstract

Feral pigs (Sus scrofa) consume and damage crops and impact the environment through predation, competition and habitat disturbance, although supporting dietary data are lacking in agricultural landscapes. This study was undertaken to determine the relative importance of food items in the diet of feral pigs in a fragmented agricultural landscape, particularly to assist in predicting the breadth of likely impacts. Diet composition was assessed from the stomach contents of 196 feral pigs from agricultural properties in southern Queensland. Feral pigs were herbivorous, with plant matter comprising >99% of biomass consumed. Crops were consumed more frequently than non-crop species, and comprised >60% of dietary biomass, indicating a clear potential for direct economic losses. Consumption of pasture and forage species also suggests potential competition for pasture with domestic stock. There is little evidence of direct predation on native fauna, but feral pig feeding activities may impact environmental values. Seasonal differences in consumption of crop, pasture or animal food groups probably reflect the changing availability of food items. We recommend that future dietary studies examine food availability to determine any dietary preferences to assist in determining the foods most susceptible to damage. The outcomes of this study are important for developing techniques for monitoring the impacts of feral pigs, essential for developing management options to reduce feral pig damage on agricultural lands.

Additional keywords: competition, damage, diet, impacts.


References

Alexiou, P. N. (1983). Effect of feral pigs (Sus scrofa) on subalpine vegetation at Smokers Gap, ACT. Proceedings of the Ecological Society of Australia 12, 135–142.

Australian Bureau of Meteorology (2014). Climate data online: Talwood State School. Available at: http://www.bom.gov.au/climate/data/stations/ [accessed 21 January 2015].

Australian Bureau of Statistics (2008). 7125.0 Agricultural Commodities: Small Area Data, Australia, 2006–07. Available at: http://www.abs.gov.au/ausstats/abs@.nsf/mf/7125.0. [accessed 21 January 2015].

Ballari, S. A., and Barrios-García, M. N. (2014). A review of wild boar Sus scrofa diet and factors affecting food selection in native and introduced ranges. Mammal Review 44, 124–134.
A review of wild boar Sus scrofa diet and factors affecting food selection in native and introduced ranges.Crossref | GoogleScholarGoogle Scholar |

Ballari, S. A., Cuevas, M. F., Ojeda, R. A., and Navarro, J. L. (2015). Diet of wild boar (Sus scrofa) in a protected area of Argentina: the importance of baiting. Mammal Research 60, 81–87.
Diet of wild boar (Sus scrofa) in a protected area of Argentina: the importance of baiting.Crossref | GoogleScholarGoogle Scholar |

Barrios-García, M. N., and Ballari, S. A. (2012). Impact of wild boar (Sus scrofa) in its introduced and native range: a review. Biological Invasions 14, 2283–2300.
Impact of wild boar (Sus scrofa) in its introduced and native range: a review.Crossref | GoogleScholarGoogle Scholar |

Baubet, E., Bonenfant, C., and Brandt, S. (2004). Diet of the wild boar in the French Alps. Galemys 16, 101–113.

Bengsen, A. J., Gentle, M. N., Mitchell, J. L., Pearson, H. E., and Saunders, G. R. (2014). Impacts and management of wild pigs Sus scrofa in Australia. Mammal Review 44, 135–147.
Impacts and management of wild pigs Sus scrofa in Australia.Crossref | GoogleScholarGoogle Scholar |

Benson, R. (1980). Evaluating feral pig damage and costs of control in western New South Wales. Department of Agriculture, New South Wales.

Braysher, M. (1993). ‘Managing Vertebrate Pests: Principles and Strategies.’ (Australian Government Publishing Service: Canberra.)

Brunner, H., and Coman, B. J. (1974). ‘The Identification of Mammalian Hair.’ (Inkata Press: Melbourne.)

Caley, P. (1993). The ecology and management of feral pigs in the ‘wet–dry’ tropics of the Northern Territory. Ph.D. Thesis, University of Canberra.

Chauhan, N. P. S., Barwal, K. S., and Kumar, D. (2009). Human–wild pig conflict in selected states in India and mitigation strategies. Acta Silvatica et Lignaria Hungarica 5, 189–197.

Choquenot, D., McIlroy, J., and Korn, T. (1996). ‘Managing Vertebrate Pests: Feral Pigs.’ (Australian Government Publishing Service: Canberra.)

Crawley, M. J. (2007). ‘The R Book.’ (John Wiley & Sons Ltd: Chichester.)

Cuevas, M. F., Ojeda, R. A., Dacar, M. A., and Jaksic, F. M. (2013). Seasonal variation in feeding habits and diet selection by wild boars in a semi-arid environment of Argentina. Acta Theriologica 58, 63–72.
Seasonal variation in feeding habits and diet selection by wild boars in a semi-arid environment of Argentina.Crossref | GoogleScholarGoogle Scholar |

Ford, G., and Stark, M. (2011). The impact of feral cats, foxes and pigs on native species and communities in the Queensland Murray–Darling Region: a review and synthesis of options for improving biodiversity outcomes from feral species management. Balance Environmental, Toowoomba.

Fordham, D., Georges, A., Corey, B., and Brook, B. W. (2006). Feral pig predation threatens the indigenous harvest and local persistence of snake-necked turtles in northern Australia. Biological Conservation 133, 379–388.
Feral pig predation threatens the indigenous harvest and local persistence of snake-necked turtles in northern Australia.Crossref | GoogleScholarGoogle Scholar |

Geisser, H., and Reyer, H. U. (2004). Efficacy of hunting, feeding, and fencing to reduce crop damage by wild boars. Journal of Wildlife Management 68, 939–946.
Efficacy of hunting, feeding, and fencing to reduce crop damage by wild boars.Crossref | GoogleScholarGoogle Scholar |

Gentle, M., and Pople, A. (2013). Effectiveness of commercial harvesting in controlling feral-pig populations. Wildlife Research 40, 459–469.
Effectiveness of commercial harvesting in controlling feral-pig populations.Crossref | GoogleScholarGoogle Scholar |

Gentle, M., Pople, A., Speed, J., and Aster, D. (2011). Assessing the role of harvesting in feral pig (Sus scrofa) management. Biosecurity Queensland, Department of Employment, Economic Development and Innovation, Toowoomba, Queensland.

Giles, J. R. (1980). The ecology of feral pigs in western New South Wales. Ph.D. Thesis, University of Sydney.

Hart, R. K., Calver, M. C., and Dickman, C. R. (2002). The index of relative importance: an alternative approach to reducing bias in descriptive studies of animal diets. Wildlife Research 29, 415–421.
The index of relative importance: an alternative approach to reducing bias in descriptive studies of animal diets.Crossref | GoogleScholarGoogle Scholar |

Herrero, J., Garcia-Serrano, A., Couto, S., Ortuno, V. M., and Garcia-Gonzalez, R. (2006). Diet of wild boar Sus scrofa L. and crop damage in an intensive agroecosystem. European Journal of Wildlife Research 52, 245–250.
Diet of wild boar Sus scrofa L. and crop damage in an intensive agroecosystem.Crossref | GoogleScholarGoogle Scholar |

Hone, J. (1980). Effect of feral pig rooting on introduced and native pasture in north-eastern New South Wales. Journal of the Australian Institute of Agricultural Science 46, 130–132.

Hone, J. (2012). ‘Applied Population and Community Ecology: The Case of Feral Pigs in Australia.’ (Wiley-Blackwell: West Sussex, UK.)

Kristiansson, H. (1985). Crop damage by wild boars in central Sweden. In ‘Proceedings of the XVIIth Congress of the International Union of Game Biologists.’ (Ed. S. A. de Crombrugghe.) pp. 605–609. (Brussels.)

Massei, G., Genov, P. V., and Staines, B. W. (1996). Diet, food availability and reproduction of wild boar in a Mediterranean coastal area. Acta Theriologica 41, 307–320.
Diet, food availability and reproduction of wild boar in a Mediterranean coastal area.Crossref | GoogleScholarGoogle Scholar |

Massei, G., Roy, S., and Bunting, R. (2011). Too many hogs? A review of methods to mitigate impact by wild boar and feral hogs. Human-Wildlife Interactions 5, 79–99.

Milanesi, P., Meriggi, A., and Merli, E. (2012). Selection of wild ungulates by wolves Canis lupus (L. 1758) in an area of the northern Apennines (north Italy). Ethology Ecology and Evolution 24, 81–96.
Selection of wild ungulates by wolves Canis lupus (L. 1758) in an area of the northern Apennines (north Italy).Crossref | GoogleScholarGoogle Scholar |

Mitchell, J. (2008). Feral pig control: a practical guide to pig control in Queensland. Queensland Department of Primary Industries & Fisheries, Brisbane

Mitchell, J., and Dorney, W. (2002). Monitoring systems for feral pigs: monitoring the economic damage to agricultural industries and the population dynamics of feral pigs in the wet tropics of Queensland. Queensland Department of Natural Resources and Mines, Brisbane.

Pavlov, P. M. (1980). The diet and general ecology of the feral pig (Sus scrofa) at Girilambone, N.S.W. M.Sc. Thesis, Monash University, Melbourne.

Pavlov, P. M., and Hone, J. (1982). The behaviour of feral pigs, Sus scrofa, in flocks of lambing ewes. Australian Wildlife Research 9, 101–109.
The behaviour of feral pigs, Sus scrofa, in flocks of lambing ewes.Crossref | GoogleScholarGoogle Scholar |

Pavlov, P. M., Hone, J., Kilgour, R. J., and Pedersen, H. (1981). Predation by feral pigs on merino lambs at Nyngan, New South Wales. Australian Journal of Experimental Agriculture and Animal Husbandry 21, 570–574.
Predation by feral pigs on merino lambs at Nyngan, New South Wales.Crossref | GoogleScholarGoogle Scholar |

Pielou, E. C. (1975). ‘Ecological Diversity.’ (Wiley Interscience: New York.) 165pp.

Plant, J. W., Marchant, R., Mitchell, T. D., and Giles, J. R. (1978). Neonatal lamb losses due to feral pig predation. Australian Veterinary Journal 54, 426–429.
Neonatal lamb losses due to feral pig predation.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DyaE1M7itlKltg%3D%3D&md5=9c1f13ae0ca973529f26e6100a29eb6cCAS | 743055PubMed |

R Core Team (2014). ‘R: A Language and Environment for Statistical Computing. Version 3.1.1.’ (R Foundation for Statistical Computing: Vienna.)

Schley, L., and Roper, T. J. (2003). Diet of wild boar Sus scrofa in western Europe, with particular reference to consumption of agricultural crops. Mammal Review 33, 43–56.
Diet of wild boar Sus scrofa in western Europe, with particular reference to consumption of agricultural crops.Crossref | GoogleScholarGoogle Scholar |

Schley, L., Dufrêne, M., Krier, A., and Frantz, A. (2008). Patterns of crop damage by wild boar (Sus scrofa) in Luxembourg over a 10-year period. European Journal of Wildlife Research 54, 589–599.
Patterns of crop damage by wild boar (Sus scrofa) in Luxembourg over a 10-year period.Crossref | GoogleScholarGoogle Scholar |

Seward, N. W., VerCauteren, K. C., Witmer, G. W., and Engeman, R. M. (2004). Feral swine impacts on agriculture and the environment. Sheep & Goat Research Journal 19, 34–40.

Sokal, R. R., and Rohlf, F. J. (1995). ‘Biometry: the Principles and Practice of Statistics in Biological Research.’ (W.H. Freeman & Co.: New York.)

Sweetapple, P. J., and Nugent, G. (1998). Comparison of two techniques for assessing possum (Trichosurus vulpecula) diet from stomach contents. New Zealand Journal of Ecology 22, 181–188.

Tisdell, C. A. (1982). ‘Wild Pigs: Environment Pest or Economic Resource?’ (Pergamon Press: Sydney.)

Triggs, B., and Brunner, H. (2002). ‘Hair ID: An Interactive Tool for Identifying Australian Mammalian Hair.’ (CSIRO Publishing: Melbourne.)

Wood, G. W., and Roark, D. N. (1980). Food habits of feral hogs in coastal South Carolina. Journal of Wildlife Management 44, 506–511.
Food habits of feral hogs in coastal South Carolina.Crossref | GoogleScholarGoogle Scholar |