Effects of wild boar predation on nests of wading

Authors: Antonio J Carpio Lars Hillström Francisco S Tortosa

Publish Date: 2016/04/22

Volume: 62, Issue: 4, Pages: 423-430

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Abstract

The wild boar has over the past few decades undergone an expansion in Europe which may have negatively affected groundnesting bird populations and particularly those of wading birds The aim of this study was to evaluate predation on waders’ nests by wild boar in Sweden where this species has been increasing since its reintroduction This was done by placing artificial nests in seven different study areas A comparison was then made of predation rates of the nests placed on control plots areas in which no wild boar were present but other predators were and plots containing different abundances of wild boar Contrary to our expectations the proportion of nests predated was significantly lower in those areas in which wild boar were present with a predation rate of 54  whereas the predation rate was 875  in the others The wild boar was identified as the second most important nest predator in the plots in which it was present accounting for 18  of the predated nests The main predator on both types of plots was the red fox which was responsible for 28 and 385  of the predated nests on plots with/without wild boar respectively Interestingly predation by badgers occurred principally in areas in which the wild boar was absent 345  of the predated nests whereas only one nest was predated by this predator in areas containing wild boar It is not however possible to state whether predation by badgers was lower because of the presence of wild boar or whether this was owing to the fact that badgers do not select those particular patches because of habitat featuresWe would like to thank all the farmers who gave us permission to work in their fields We would also like to thank Staffan Ulfstrand for his comments on earlier drafts of the manuscript The authors wish to acknowledge the many collaborators who contributed to the field work during the study period such as IngaBritt Margareta Inge and Petter This work received financial support from the research project AGL201240128C0301 and EU–FEDER funds AJC holds a FPI predoctoral scholarship

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