title: Inbreeding depression in a parasitoid wasp with single-locus complementary sex determination.
abstract: Inbreeding and inbreeding depression are key processes in small or isolated populations and are therefore central concerns for the management of threatened or (re)introduced organisms. Haplodiploid species of the order Hymenoptera have a particular status with regard to inbreeding depression. Although recessive deleterious alleles that are expressed in males should be purged, an alternative form of inbreeding depression exists in species with single-locus complementary sex determination (sl-CSD). Under sl-CSD, genetically-related parents have a high probability of producing sterile sons instead of fertile daughters. In this article, we study inbreeding depression in Venturia canescens (Hymenoptera: Ichneumonidae), a parasitoid wasp with sl-CSD. We used a crossing design to manipulate relatedness according to three levels: within-family, between-family and between-population. For each level, several fitness components were measured on parents and female offspring. We found a 20% reduction in egg load at emergence for inbred crosses. Inbred crosses also yielded a higher proportion of males, as expected in a species with sl-CSD. Mating probability, presence of daughters among offspring, body size, symmetry and longevity were unaffected by inbreeding.
authors.affiliation: INRA, UMR 1355 Institute Sophia Agrobiotech, Sophia Antipolis, France; Université de Nice Sophia Antipolis, UMR Institute Sophia Agrobiotech, Sophia Antipolis, France; CNRS, UMR 7254 Institute Sophia Agrobiotech, Sophia Antipolis, France.
authors.forename: Chloé
authors.initials: C
authors.lastname: Vayssade
authors.affiliation: INRA, UMR 1355 Institute Sophia Agrobiotech, Sophia Antipolis, France; Université de Nice Sophia Antipolis, UMR Institute Sophia Agrobiotech, Sophia Antipolis, France; CNRS, UMR 7254 Institute Sophia Agrobiotech, Sophia Antipolis, France.
authors.forename: Céline
authors.initials: C
authors.lastname: de Fazio
authors.affiliation: INRA, UMR 1355 Institute Sophia Agrobiotech, Sophia Antipolis, France; Université de Nice Sophia Antipolis, UMR Institute Sophia Agrobiotech, Sophia Antipolis, France; CNRS, UMR 7254 Institute Sophia Agrobiotech, Sophia Antipolis, France.
authors.forename: Bastien
authors.initials: B
authors.lastname: Quaglietti
authors.affiliation: INRA, UMR 1355 Institute Sophia Agrobiotech, Sophia Antipolis, France; Université de Nice Sophia Antipolis, UMR Institute Sophia Agrobiotech, Sophia Antipolis, France; CNRS, UMR 7254 Institute Sophia Agrobiotech, Sophia Antipolis, France.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Auguste
authors.affiliation: INRA, UMR 1355 Institute Sophia Agrobiotech, Sophia Antipolis, France; Université de Nice Sophia Antipolis, UMR Institute Sophia Agrobiotech, Sophia Antipolis, France; CNRS, UMR 7254 Institute Sophia Agrobiotech, Sophia Antipolis, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Ris
authors.affiliation: INRA, UMR 1355 Institute Sophia Agrobiotech, Sophia Antipolis, France; Université de Nice Sophia Antipolis, UMR Institute Sophia Agrobiotech, Sophia Antipolis, France; CNRS, UMR 7254 Institute Sophia Agrobiotech, Sophia Antipolis, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Fauvergue
mesh_terms: D000818:Animals; D049628:Body Size; D003433:Crosses, Genetic; D005260:Female; D005602:France; D056426:Genetic Loci; D007178:Inbreeding; D016014:Linear Models; D008136:Longevity; D008297:Male; D010063:Ovum / Q000378:metabolism; D010271:Parasites / Q000235:genetics*; D019849:Sex Determination Processes; D012744:Sex Ratio; D014863:Wasps / Q000033:anatomy & histology / Q000235:genetics* / Q000502:physiology*