Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 407259
Title Intrinsic competition between two secondary hyperparasitoids results in temporal trophic switch
Author(s) Harvey, J.A.; Pashalidou, F.G.; Soler, R.; Bezemer, T.M.
Source Oikos 120 (2011)2. - ISSN 0030-1299 - p. 226 - 233.
Department(s) Laboratory of Entomology
Laboratory of Nematology
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) solitary parasitoid wasp - physiological suppression - leptopilina-heterotoma - insect parasitoids - interspecific competition - intraguild predation - host discrimination - aphytis-melinus - lysibia-nana - superparasitism
Abstract Interspecific competition amongst parasitoids is important in shaping the evolution of life-history strategies in these insects as well as community structure. Competition for hosts may occur between adult female parasitoids (‘extrinsic’ competition) or their progeny (‘intrinsic’ competition). Here, we examined intrinsic competition between two solitary secondary hyperparasitoids, Lysibia nana and Gelis agilis in cocoons of a primary parasitoid, Cotesia glomerata. Each species was allowed to sting hosts previously parasitized by the other at 24 h time intervals over the course of 144 h (6 days). When hosts were attacked simultaneously, neither species was dominant although the species to attack first won most encounters when it had a 24–48 h head start. However, after this time there was dramatic shift in the outcome with G. agilis dominating in all hosts > 72-h old, regardless of which species had parasitized C. glomerata first. G. agilis larvae, which initially had competed with L. nana for control of C. glomerata resources, began attacking the larvae of L. nana, whereas L. nana rejected hosts with older G. agilis larvae or pupae. Effects of multiparasitism also affected the development time and adult mass of the winning parasitoid. Our results reveal a shift in the trophic status of G. agilis from C. glomerata (in younger hosts) to L. nana (in older hosts), the first time such a phenomenon has been reported in parasitoids
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