Abstract
Parasites can play an important role in the dynamics of host populations, but empirical evidence remains sparse. We investigated the role of bot fly (Cuterebra spp.) parasitism in red-backed voles (Myodes gapperi) by first assessing the impacts of the parasite on the probability of vole survival under stressful conditions as well as on the reproductive activity of females. We then identified the main factors driving both the individual risk of infection and the abundance of bot flies inside red-backed voles. Finally, we evaluated the impacts of bot fly prevalence on the growth rate of vole populations between mid-July and mid-August. Thirty-six populations of red-backed voles were sampled in the boreal forest of Québec, Canada. The presence and the abundance of parasites in voles, two host life history traits (sex and body condition), three indices of habitat complexity (tree basal area, sapling basal area, coarse woody debris volume), and vole abundance were considered in models evaluating the effects of bot flies on host populations. We found that the probability of survival of red-backed voles in live traps decreased with bot fly infection. Both the individual risk of infection and the abundance of bot flies in red-backed voles were driven mainly by vole abundance rather than by the two host life history traits or the three variables of habitat complexity. Parasitism had population consequences: bot fly prevalence was linked to a decrease in short-term growth rate of vole populations over the summer. We found that bot flies have the potential to reduce survival of red-backed voles, an effect that may apply to large portions of populations.
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Acknowledgements
We thank our field and laboratory assistants: E. Bilodeau, A. Bourke, M. Bouthillette, S. Brugerolle, G. Côté, C. Laberge-Pelletier, F. Lavoie, and I. Plante. G. Pelletier from the Canadian Forest Service helped with the identification of bot flies. L. Marschall, M. Wolf, C. A. Johnson, K. Poitras, P. Etcheverry, N. Courbin, J. Hodson, M. Houle and two anonymous reviewers provided useful comments on earlier versions of this manuscript. This research was founded by the NSERC–Université Laval industrial research chair in silviculture and wildlife, the Canada Foundation for Innovation, and the Fond Québécois de la Recherche sur la Nature et les Technologies. We thank our numerous industrial partners who facilitated field work and provided access to management areas: M. St-Onge (Kruger), C. Warren, C. Gauthier, and J.-F. Gauthier (Abitibi Consolidated), and D. Gagnon (Bowater). Animals were captured and handled following the protocol approved by the Animal Welfare Committee of Université Laval and the Ministère des Ressources Naturelles et de la Faune du Québec.
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Communicated by Libby Marschall.
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Lemaître, J., Fortin, D., Montiglio, PO. et al. Bot fly parasitism of the red-backed vole: host survival, infection risk, and population growth. Oecologia 159, 283–294 (2009). https://doi.org/10.1007/s00442-008-1219-3
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DOI: https://doi.org/10.1007/s00442-008-1219-3