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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Migration of feral pigs (Sus scrofa) in rainforests of north Queensland: fact or fiction?
Auteurs :	J. Mitchell, Auteur ; W. Dorney, Auteur ; R. Mayer, Auteur ; J. Mcilroy, Auteur
Type de document :	Article
Dans :	Wildlife Research (36(2) 2009)
Article en page(s) :	110-116
Langues:	Anglais
Résumé :	The Wet Tropics bioregion of north Queensland has been identified as an area of global significance. The world-heritage-listed rainforests have been invaded by feral pigs (Sus scrofa) that are perceived to cause substantial environmental damage. A community perception exists of an annual altitudinal migration of the feral-pig population. The present study describes the movements of 29 feral pigs in relation to altitudinal migration ( highland, transitional and lowland areas). Feral pigs were sedentary and stayed within their home range throughout a 4-year study period. No altitudinal migration was detected; pigs moved no more than a mean distance of 1.0 km from the centre of their calculated home ranges. There was no significant difference between the mean (+/- 95% confidence interval) aggregate home ranges for males (8.7 +/- 4.3 km(2), n = 15) and females (7.2 +/- 1.8 km(2), n = 14). No difference in home range was detected among the three altitudinal areas: 7.2 +/- 2.4 km(2) for highland, 6.2 +/- 3.9 km(2) for transitional and 9.9 +/- 5.3 km(2) for lowland areas. The aggregate mean home range for all pigs in the present study was 8.0 +/- 2.4 km(2). The study also assessed the influence seasons had on the home range of eight feral pigs on the rainforest boundary; home ranges did not significantly vary in size between the tropical wet and dry seasons, although the mean home range in the dry season (7.7 +/- 6.9 km(2)) was more than twice the home range in the wet season (2.9 +/- 0.8 km(2)). Heavier pigs tended to have larger home ranges. The results of the present study suggest that feral pigs are sedentary throughout the year so broad-scale control techniques need to be applied over sufficient areas to encompass individual home ranges. Control strategies need a coordinated approach if a long-term reduction in the pig population is to be achieved.

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