A - Papers appearing in refereed journals
Ward, S. A., Leather, S. R., Pickup, J. and Harrington, R. 1998. Mortality during dispersal and the cost of host-specificity in parasites: how many aphids find hosts? Journal of Animal Ecology. 67 (5), pp. 763-773.
|Authors||Ward, S. A., Leather, S. R., Pickup, J. and Harrington, R.|
1. For a full assessment of explanations for the evolution of host-specificity it is necessary to estimate the probability that a dispersing parasite finds a host. We develop a method of estimating this success rate from samples of dispersing parasites and populations resident on hosts. 2. Applying this method to data on the bird cherry-oat aphid, Rhopalosiphum padi (L.), from southern Scotland in 1984-92, we estimate that 0.6% of the autumn migrants find hosts. 3. With such a low success rate, there should be selection for a broadening of host range, to include any host on which the colonist's fitness is more than about 0.6% of that on the normal hosts. We argue that neither nutrition nor the need for 'enemy-free space' are sufficient explanations of the host-specificity of this animal, and propose instead that it is the host's role as a rendezvous for mating that constrains the migrants to their costly host-specificity. 4. We also discuss the implications of this low success rate for the hypothesis that aphids speciate sympatrically through the formation of host races.
|Year of Publication||1998|
|Journal||Journal of Animal Ecology|
|Journal citation||67 (5), pp. 763-773|
|Digital Object Identifier (DOI)||doi:10.1046/j.1365-2656.1998.00238.x|
|Open access||Published as non-open access|
|Funder project or code||211|
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