Journal article
Genotypic vs. condition effects on parasite-driven rare advantage
Journal of evolutionary biology, Vol.17(5), pp.967-973
09/2004
Handle:
https://hdl.handle.net/2376/108849
PMID: 15312069
Abstract
Models and empirical studies of coevolution assume host resistance and parasite infectivity are genetically based. However, nongenetic physiological or environmental influences could alter host susceptibility even when the relationship is genetically based. In this experiment we examined the influence of host genotype, host condition at the time of infection (age and reproductive status), and their interaction on resistance of the freshwater snail Potamopyrgus antipodarum) to its dominant trematode parasite (Microphallus sp.). We used a laboratory infection experiment of a clonal snail population to determine the susceptibility of juveniles, brooding adult females, and nonbrooding adult females. We found a significant effect of both life-history state and clonal genotype on the prevalence of infection. However, the relative susceptibility of different clonal genotypes was not altered by condition; genotypes that were rare in the natural population were less infected than those that were common for each life-history state. These results suggest that although host condition affects susceptibility, it does not disrupt the specificity of the match between parasites and common clonal genotypes. Hence these findings support the Red Queen hypothesis for the maintenance of sex under genetically based host-parasite interactions.
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Details
- Title
- Genotypic vs. condition effects on parasite-driven rare advantage
- Creators
- M F Dybdahl - School of Biological Sciences, Washington State University, Pullman, WA, USA. dybdahl@wsu.eduA C Krist
- Publication Details
- Journal of evolutionary biology, Vol.17(5), pp.967-973
- Academic Unit
- Biological Sciences, School of
- Publisher
- Switzerland
- Identifiers
- 99900547156801842
- Language
- English
- Resource Type
- Journal article