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(a) Mean survival of diapausing larvae of the specialist herbivore Melitaea cinxia and (b) Mean parasitism rate of M. cinxia by Cotesia melitaearum as a function of genotype mean leaf catalpol concentration in the food plant Plantago lanceolata. Closed circles: Dutch plant genotypes; open circles: Finnish plant genotypes. Lines are fitted values from logistic regressions based on data from all genotypes
