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Reciprocal natural selection on host‐parasite phenotypes

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journal contribution
posted on 1999-09-01, 00:00 authored by D Clayton, Patricia LeePatricia Lee, D Tompkins, E Brodie
Coevolution is evolution in one species in response to selection imposed by a second species, followed by evolution in the second species in response to reciprocal selection imposed by the first species. Although reciprocal selection is a prerequisite of coevolution, it has seldom been documented in natural populations. We examined the feasibility of reciprocal selection in a simple host‐parasite system consisting of feral pigeons (Columba livia) and their Ischnoceran feather lice (Phthiraptera: Insecta). We tested for a selective effect of parasites on hosts with experimentally altered defenses and for a selective effect of host defense on a component of parasite escape. Previous work indicates that pigeons control lice through efficient preening, while lice escape from preening using complex avoidance behavior. Our results show that feral pigeons with impaired preening, owing to slight bill deformities, have higher louse loads than pigeons with normal bills. We use a controlled experiment to show that high louse loads reduce the survival of pigeons, suggesting that lice select for efficient preening and against bill deformities. In a reciprocal experiment, we demonstrate that preening with a normal bill selects for small body size in lice, which may facilitate their escape from preening. The results of this study verify a crucial element of coevolutionary theory by identifying likely targets of reciprocal phenotypic selection between host and parasite.

History

Journal

American naturalist

Volume

154

Issue

3

Pagination

261 - 270

Publisher

University of Chicago Press

Location

Chicago, Ill.

ISSN

0003-0147

eISSN

1537-5323

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1999, University of Chicago Press