Abstract
Shared enemies may instigate or modify competitive interactions between species. The disequilibrium caused by non-native species introductions has revealed that the outcome of such indirect interactions can often be dramatic. However, studies of enemy mediated competition mostly consider the impact of a single enemy, despite species being embedded in complex networks of interactions. Here we demonstrate that native red and invasive grey squirrels in Britain, two terrestrial species linked by resource and disease-mediated apparent competition, are also now linked by a second enemy-mediated relationship involving a shared native predator recovering from historical persecution, the European pine marten. Through combining spatial capture recapture techniques to estimate pine marten density, and squirrel site occupancy data, we find that the impact of exposure to predation is highly asymmetrical, with non-native grey squirrel occupancy strongly negatively affected by exposure to pine martens. In contrast, exposure to pine marten predation has an indirect positive effect on red squirrel populations. Pine marten predation thus reverses the well-documented outcome of resource and apparent competition between red and grey squirrels.
Original language | English |
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Article number | 20172603 |
Number of pages | 9 |
Journal | Proceedings of the Royal Society of London. B, Biological Sciences |
Volume | 285 |
Early online date | 7 Mar 2018 |
DOIs | |
Publication status | Published - 14 Mar 2018 |
Bibliographical note
Electronic supplementary material is available online at https://dx.doi.org/10.6084/m9.figshare.c.4014001.Acknowledgements
We thank Forest Enterprise Scotland and Trees for Life for support. Thanks also to the Scottish Wildlife Trust, E. Schulte, B. Priestly, K. Kortland, A. Jarrott, D. Anderson, T. Lightly, I. Cepukaite, S. Eastwood, M. Oliver, L. Currie, R. Greenwood, P. Whyatt, M. Hawkins, G. Neill, S. Willis, G. Stewart, I. Wilkinson, T. Ferrie, Luss Estates, Penicuik Estate, East and West Dunbartonshire Councils, Ballikinrain School and Dawyck Botanic Gardens.
Keywords
- occupancy modelling
- spatial capture recapture
- apparent competition
- predator mediated competition
- pest-regulating ecosystem service
- species interactions
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Sheehy, E. (Creator), Sutherland, C. (Creator), O’Reilly, C. (Creator) & Lambin, X. (Creator), Dryad Digital Repository, 16 Feb 2018
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Xavier Lambin
- Biological Sciences, Aberdeen Centre For Environmental Sustainability - Chair in Zoology
Person: Academic