The Mathematical Institute, University of Oxford, Eprints Archive

Parasite spill-back from domestic hosts may induce an Allee effect in wildlife hosts

Krkošek, M. and Ashander, J. and Lewis, M. A. (2012) Parasite spill-back from domestic hosts may induce an Allee effect in wildlife hosts. Proceedings of the Royal Society B . (Submitted)

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Abstract

The exchange of native pathogens between wild and domesticated animals can lead to novel disease dynamics. A simple model reveals that the spill-back of native parasites
from domestic to wild hosts may cause a demographic Allee effect. Because parasite spill-over and spill-back decouples the abundance of parasite infectious stages from the abundance of the wild host population, parasitism and mortality of the wild host population increases non-linearly as host abundance decreases. Analogous to the effects of satiation of generalist predators, parasite spill-back can produce an unstable equilibrium in the abundance of the host population above which the host population persists and below which it is at risk of extirpation. These effects are likely to be most pronounced in systems where the parasite has a high efficiency of transmission from domestic to wild host populations due to prolonged sympatry, disease vectors, or proximity of domesticated populations to wildlife migratory corridors.

Item Type:Article
Subjects:D - G > General
Research Groups:Oxford Centre for Collaborative Applied Mathematics
ID Code:1487
Deposited By:Peter Hudston
Deposited On:02 Mar 2012 07:46
Last Modified:02 Mar 2012 07:46

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