Density-dependent intraguild predation of an aphid parasitoid

摘要: A growing body of research has examined the effect shared resource density on intraguild predation (IGP) over relatively short time frames. Most this work led to conclusion that when is high, strength IGP should be lower, due prey dilution. However, experiments addressing topic have been done using micro- or mesocosms excluded possibility predator aggregation. We an aphid parasitoid in open field setting where effects dilution and aggregation could occur simultaneously. brought potted soybean plants with 2, 20, 200 aphids (Aphis glycines) 20 pupae (‘mummies’) Binodoxys communis into fields Minnesota, USA. monitored onto plants, mummies, successful adult emergence B. communis. found was higher at densities our experimental coincided lower communis, indicating even if a occurred study, it overcome by short-term Our results suggest may more nuanced than microcosms