An experimental investigation of the phenotypic consequences of intraspecific hybridization was realised on two biocontrol agents, the larval endoparasitoidPsyttalia lounsburyiand one species of egg parasitoid,Trichogramma chilonis. Taken as a whole, these experiments evidence a great variability of the hybrid’s phenotypes with regard to their parents, ranging from inbreeding depression* to heterosis**. Moreover, we evidenced that the genetic architecture of the investigated traits was complex including cyto-nuclear interactions or genotype-by-environment interactions. The extent to which such intraspecific variability can be actually exploited has to be further evaluated.
*inbreeding depression = the relative fitness reduction of offspring from inbred parents
**heterosis = relative fitness increase of offspring originated from outbred parents
- Benvenuto C, Cheyppe-Buchmann S, Bermond G, Ris N, Fauvergue X. 2012a. Intraspecific hybridization, life history strategies and potential invasion success in a parasitoid wasp.Evolutionary Ecology26: 1311-29.
- Benvenuto C, Tabone E, Vercken E, Sorbier N, Colombel E, Warot S, Fauvergue X, Ris N. 2012b. Intraspecific variability in the parasitoid waspTrichogramma chilonis: can we predict the outcome of hybridization?Evolutionary Applications5: 498-510.