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- W1796252254 abstract "Abstract As food items can vary in nutrient composition, diet selectivity can be an important trait to optimize nutrition. Most parasitoids depend as adults on various sugar‐rich food sources such as nectar and honeydew. Nectar is often superior as a food source to honeydew, yielding higher parasitoid longevity. Little is known, however, of a preference parasitoids may have for one of these sugar sources and how this affects variation in their life‐history traits. In this study, a combined empirical and modelling approach was adopted. First, it was investigated whether parasitoids show a feeding preference for nectar or honeydew in the laboratory and whether feeding history affects the preference of parasitoids. Second, using a process‐based spatially explicit simulation model, it was evaluated how preference for nectar affects parasitoid life‐history variables in fields with varying flower densities. The laboratory study revealed that naïve parasitoids showed no preference for either nectar or honeydew. However, when parasitoids had fed previously on honeydew and were then given the choice between nectar and honeydew, they preferred feeding on nectar to honeydew (with marginal statistical significance). Model simulations indicated that when nectar sources were present in the field, parasitoids that showed preference for nectar had a 1.3–1.8 times longer life span and parasitised up to 1.4 times more hosts than parasitoids that did not distinguish between honeydew and nectar. These combined empirical and modelling data suggest that aphid parasitoids may be able to discriminate between nectar and honeydew, and that a preference for nectar may enhance their longevity and reproduction in fields where nectar sources are available." @default.
- W1796252254 created "2016-06-24" @default.
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- W1796252254 date "2010-08-16" @default.
- W1796252254 modified "2023-10-17" @default.
- W1796252254 title "Nectar vs. honeydew feeding by aphid parasitoids: does it pay to have a discriminating palate?" @default.
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- W1796252254 doi "https://doi.org/10.1111/j.1570-7458.2010.01025.x" @default.
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