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• W2097061252 abstract "The availability of nonhost resource subsidies affects the ability of parasitoids to overcome egg and time limitation and maximize lifetime reproductive success. We combined field and laboratory experiments to examine the effects of floral resource subsidies on the reproductive fitness of aphid parasitoids. Under controlled laboratory conditions, sugar resources significantly increased longevity and potential fecundity (egg load) in the endoparasitoids Aphidius rhopalosiphi and Diaeretiella rapae (Hymenoptera: Aphidiidae). Laboratory microcosm experiments showed that increased potential fecundity translated into significantly higher realized fecundity (i.e., rates of aphid parasitism) by A. rhopalosiphi receiving resource subsidies. Mechanisms of enhanced realized fecundity also operated under natural field conditions. Replicated field experiments on cultivated wheat, with host density controlled by experimental placement of aphids, showed that, in general, proximity to floral resource patches significantly increased rates of parasitism. Parasitism rates declined exponentially with increasing distance from floral patches, reaching zero beyond 14 m. Increased potential fecundity reduces the chances of parasitoids becoming egg-limited, whereas increased longevity reduces the chances of parasitoids becoming time-limited during host oviposition. Although the plasticity of egg load and longevity observed under varying conditions of resource availability is probably more relevant to parasitoid evolution, the individual fitness benefits from ephemeral resource patches are certainly important in the ecological enhancement of biological control agents." @default.
• W2097061252 created "2016-06-24" @default.
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• W2097061252 date "2004-03-01" @default.
• W2097061252 modified "2023-10-03" @default.
• W2097061252 title "IMPROVED FITNESS OF APHID PARASITOIDS RECEIVING RESOURCE SUBSIDIES" @default.
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• W2097061252 doi "https://doi.org/10.1890/03-0222" @default.
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