An alternative to killing? Treatment of reservoir hosts to control a vector and pathogen in a susceptible species

Porter, R., Norman, R.A. and Gilbert, L. (2013) An alternative to killing? Treatment of reservoir hosts to control a vector and pathogen in a susceptible species. Parasitology, 140(2), pp. 247-257. (doi: 10.1017/S0031182012001400) (PMID:22939093)

Abstract

Parasite-mediated apparent competition occurs when one species affects another through the action of a shared parasite. One way of controlling the parasite in the more susceptible host is to manage the reservoir host. Culling can cause issues in terms of ethics and biodiversity impacts, therefore we ask: can treating, as compared to culling, a wildlife host protect a target species from the shared parasite? We used Susceptible Infected Recovered (SIR) models parameterized for the tick-borne louping ill virus (LIV) system. Deer are the key hosts of the vector (Ixodes ricinus) that transmits LIV to red grouse Lagopus lagopus scoticus, causing high mortality. The model was run under scenarios of varying acaricide efficacy and deer densities. The model predicted that treating deer can increase grouse density through controlling ticks and LIV, if acaricide efficacies are high and deer densities low. Comparing deer treated with 70% acaricide efficacy with a 70% cull rate suggested that treatment may be more effective than culling if initial deer densities are high. Our results will help inform tick control policies, optimize the targeting of control methods and identify conditions where host management is most likely to succeed. Our approach is applicable to other host-vector-pathogen systems.

• Item Type: Articles
• Additional Information: R.P. was funded by a Natural Environment Research Council studentship (NE/H527316/1) and the Macaulay Development Trust, awarded to L.G. and R.N. L.G. was funded by the Scottish Government Rural Environment Research and Analysis Directorate.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Gilbert, Dr Lucy
• Authors: Porter, R., Norman, R.A., and Gilbert, L.
• College/School: College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
• Journal Name: Parasitology
• Publisher: Cambridge University Press
• ISSN: 0031-1820
• ISSN (Online): 1469-8161
• Published Online: 03 September 2012