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Increased survival of adult wild boar under low hunting effort promotes tuberculosis related mortality

AuthorsBarasona, José A. ; Acevedo, Pelayo ; Queirós, João ; Díez-Delgado, Iratxe ; Carrasco García de León, Ricardo ; Gortázar, Christian ; Vicente, Joaquín
Issue Date2016
Citation12th EWDA Conference (2016)
AbstractUnderstanding infection dynamics in different management scenarios is a key element of disease control. We therefore studied adult Eurasian wild boar (Sus scrofa) survival and the causes of their mortality in two tuberculosis (TB) endemic populations in Spain by comparing a mosaic of hunting estates (MT; 24 GPS collared animals) with a National Park in which population control is restricted (DNP; 21 animals). Mean adult survival (overall 470 days) and annual mortality rate (overall 45 %) were significantly greater in the protected DNP (672 ± 96 days, 34 % mean annual mortality rate) than in the regularly hunted MT (297 ± 41 days, 56%). Hunting/population control accounted for one half (53%) of the total mortality in adults, whereas TB caused one third (30 %). Although annual mortality resulting from hunting differed between areas, 40.3 % and 8.4 % for MT and DNP, the TB-related mortality did not vary between sites: 12.4 and 14%, respectively. Annual mortality rates for adults were within the ranges described for Europe, whereas our reported proportions of natural mortality (usually reported at 3 %), mainly due to TB, were higher. Since previous findings suggest that TB induced mortality is relevant in piglets and subadults, our results are compatible with adult wild boar being able to cope chronically with TB (one would expect increased compensatory TB mortality as hunting pressure decreases if otherwise TB rapidly progressed in not hunted adults). This complex interplay between demographical, managernent and disease factors evidenced that currently applied hunting efforts (40 % for adults in the hunting estate area), are ineffective to reduce population (which still increase) and TB. These results have implications for TB control at the wildlife - livestock interface and as regards the role of hunters in wild boar management and TB control.
DescriptionPresentado a la 12th Conference of the European Wildlife Disease Association (EWDA), celebrada en Berlin (Alemania) del 27 al 31 de agosto de 2016.
Appears in Collections:(IREC) Comunicaciones congresos
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