Skip to Main content Skip to Navigation
Journal articles

Sterile males in a parasitoid wasp with complementary sex determination: from fitness costs to population extinction

Abstract : Background: Single-locus complementary sex determination (sl-CSD), which occurs in some insects of the order Hymenoptera, imposes a heavy genetic load that can drive small populations to extinction. The core process in these species is the development of individuals homozygous at the sex-determining locus into unfit diploid males. The risk of extinction of populations with sl-CSD is theoretically much higher if diploid males are viable and capable of mating but sterile, because diploid males then decrease the reproductive output of both their parents and the females with which they mate. Results: In the parasitoid wasp Venturia canescens (Hymenoptera: Ichneumonidae), diploid males resembled their haploid counterparts in most respects, but their mating success was nevertheless lower than that of haploid males, especially when the two types of males were placed in competition. Furthermore, although diploid males transferred viable sperm during copulation, they sired no daughters: the females with which they mated produced only sons, like virgin females. A simulation model combining behavior, genetics and demography demonstrated that for two alternative hypotheses concerning the fertilization success of diploid sperm, the mating success of diploid males strongly affected population dynamics. Conclusion: The performance of diploid males should be estimated in competitive situations. It is a crucial determinant of the probability of extinction.
Document type :
Journal articles
Complete list of metadata

Cited literature [84 references]  Display  Hide  Download
Contributor : Migration ProdInra Connect in order to contact the contributor
Submitted on : Wednesday, May 27, 2020 - 6:23:55 PM
Last modification on : Thursday, August 4, 2022 - 4:57:13 PM


2015_Fauvergue_BMC Ecology_1.p...
Publisher files allowed on an open archive



Xavier Fauvergue, Anna Chuine, Chloé Vayssade, Alexandra Auguste, Emmanuel Desouhant. Sterile males in a parasitoid wasp with complementary sex determination: from fitness costs to population extinction. BMC Ecology, BioMed Central, 2015, 15, ⟨10.1186/s12898-014-0032-6⟩. ⟨hal-02635604⟩



Record views


Files downloads