Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/24687
Appears in Collections:Computing Science and Mathematics Journal Articles
Peer Review Status: Refereed
Title: Evolution of host resistance towards pathogen exclusion: the role of predators
Authors: Hoyle, Andrew
Best, Alex
Bowers, Roger
Contact Email: ash@cs.stir.ac.uk
Keywords: adaptive dynamics
co-evolution
eco-epidemiology
extinction
parasite
singular strategy
ecology
evolutionary biology
genetics and heredity
Issue Date: Feb-2012
Citation: Hoyle A, Best A & Bowers R (2012) Evolution of host resistance towards pathogen exclusion: the role of predators, Evolutionary Ecology Research, 14 (2), pp. 125-146.
Abstract: Question: Can increased host resistance drive a pathogen to extinction? Do more complex ecosystems lead to significantly different evolutionary behaviour and new potential extinctions? Mathematical method: Merging host-parasite models with predator-prey models. Analytically studying evolution using adaptive dynamics and trade-off and invasion plots, and carrying out numerical simulations. Key assumptions: Mass action (general mixing). All individuals of a given phenotype are identical. Only prey vulnerable to infection. Mutations are small and rare (however, the assumption on the size of mutation is relaxed later). In simulations, very small (negligible) populations are at risk of extinction. Conclusions: The presence of the predator can significantly change evolutionary outcomes for host resistance to a pathogen and can create branching points where none occurred previously. The pathogen (and sometimes the predator) is protected from exclusion if we take mutations to be arbitrarily small; however, relaxing the assumption on mutation size can lead to its exclusion. Increased resistance can drive the predator and/or pathogen to extinction depending on inter-species dynamics, such as the predator's preference for infected prey. Predator co-evolution can move exclusion boundaries and prevent the predator's own extinction if its rate of mutation is high enough (with respect to that of the prey).
URL: http://www.evolutionary-ecology.com/abstracts/v14/2723.html
Rights: Copyright is retained by the author. Proper attribution is required.

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