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Host Marking Enhances Parasitism Risk for a Fruit-Infesting Fly Rhagoletis basiola
Bernard D. Roitberg and Robert G. Lalonde
Vol. 61, No. 3 (Sep., 1991), pp. 389-393
Stable URL: http://www.jstor.org/stable/3545246
Page Count: 5
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We demonstrated that chemical marking of hosts following oviposition by the rosehip fly, Rhagoletis basiola, increases risk of egg parasitism by the wasp Halticoptera rosae. This is because wasps allocate more time and locate eggs more readily when searching marked versus unmarked hosts. Thus, the benefit of host marking (reduced rate of larval competition) may be offset by increased risk of parasitism. We considered this tradeoff through development of analytical parasitoid-host models that evaluate the success of marking and non-marking flies in the presence of parasitoids. We found over a range of conditions that low to moderate equilibrium frequencies of non-marking flies could persist when competition between the two types of flies is mediated by higher parasitoid attacks on markers.
Oikos © 1991 Nordic Society Oikos