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.

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Record number 369529
Title Cotesia flavipes Cameron and Cotesia sesamiae (Cameron) (Hymenoptera : Braconidae) do not exhibit complementary sex determination: Evidence from field populations
Author(s) Niyibigira, E.I.; Overholt, W.A.; Stouthamer, R.
Source Applied Entomology and Zoology 39 (2004)4. - ISSN 0003-6862 - p. 705 - 715.
Department(s) Laboratory of Entomology
Publication type Refereed Article in a scientific journal
Publication year 2004
Keyword(s) diploid males - mating-behavior - haplo-diploidy - parasitic wasp - ichneumonidae - consequences - habrobracon - stemborers - genetics - alleles
Abstract Diploid males are expected to occur in populations of some Hymenoptera because of the single-locus complementary sex determination (sl-CSD) mechanism. If sl-CSD is found in a species that produces gregarious broods and sib mates at a high frequency, a fraction of these sib-matings (matched mating) produces diploid male offspring. We developed models to predict the matched mating frequency in populations with different frequencies of sib mating and egg fertilization. The predictions of these models are used to determine if we can use the distributions of brood sex ratio and brood size to determine if a species has sl-CSD. The models show that sl-CSD can be detected from these brood sex ratios if the diploid male offspring survives. We applied our models to Cotesia sesamiae and its exotic congener Cotesia flavipes (Hymenoptera: Braconidae), to determine if sl-CSD occurs in these species. Parasitoids were reared from stemborer larvae sampled from maize fields in Kenya between 1992 and 1999. We found no evidence for the presence of sl-CSD with survival of diploid males in both braconid species, but we cannot exclude the possibility that sl-CSD with diploid male mortality takes place in these species.
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