Genotypic vs. condition effects on parasite-driven rare advantage.

摘要: Models and empirical studies of coevolution assume host resistance parasite infectivity are genetically based. However, nongenetic physiological or environmental influences could alter susceptibility even when the relationship is In this experiment we examined influence genotype, condition at time infection (age reproductive status), their interaction on freshwater snail Potamopyrgus antipodarum) to its dominant trematode (Microphallus sp.). We used a laboratory clonal population determine juveniles, brooding adult females, nonbrooding females. found significant effect both life-history state genotype prevalence infection. relative different genotypes was not altered by condition; that were rare in natural less infected than those common for each state. These results suggest although affects susceptibility, it does disrupt specificity match between parasites genotypes. Hence these findings support Red Queen hypothesis maintenance sex under based host–parasite interactions.