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The cabbage aphid Brevicoryne brassicae is a specialist herbivore that sequesters glucosinolates from its host plant as a defense against its predators. It is unknown to what extent parasitoids are affected by this sequestration. We investigated herbivore-mediated effects of glucosinolates on the parasitoid wasp Diaeretiella rapae and the predator Episyrphus balteatus. We reared B. brassicae on three...
1. Arthropod communities are structured by complex interactions between bottom‐up (resource‐based) and top‐down (natural enemy‐based) forces. Their relative importance in shaping arthropod communities, however, continues to be under debate. Bottom‐up and top‐down forces can be affected by intraspecific plant variation, for example by differences in concentrations of secondary metabolites that affect...
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