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




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BMC Ecology

, 15:13

First Online: 12 May 2015Received: 27 June 2014Accepted: 16 December 2014DOI: 10.1186-s12898-014-0032-6

Cite this article as: Fauvergue, X., Chuine, A., Vayssade, C. et al. BMC Ecol 2015 15: 13. doi:10.1186-s12898-014-0032-6

Abstract

BackgroundSingle-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.

ResultsIn 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.

ConclusionThe performance of diploid males should be estimated in competitive situations. It is a crucial determinant of the probability of extinction.

KeywordsSex determination Extinction vortex Inbreeding Inbreeding depression Diploid males Hymenoptera Mate-choice Population biology Electronic supplementary materialThe online version of this article doi:10.1186-s12898-014-0032-6 contains supplementary material, which is available to authorized users.

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Author: Xavier Fauvergue - Anna Chuine - Chloé Vayssade - Alexandra Auguste - Emmanuel Desouhant

Source: https://link.springer.com/







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