Investigating the genetic load of an emblematic invasive species: the case of the invasive harlequin ladybird Harmonia axyridis

Tayeh Ashraf, Estoup Arnaud, Hufbauer Ruth A., Ravigné Virginie, Goryacheva I., Zakharov I.A., Lombaert E., Facon Benoît. 2013. Investigating the genetic load of an emblematic invasive species: the case of the invasive harlequin ladybird Harmonia axyridis. Ecology and Evolution, 3 (4) : 864-871.

https://doi.org/10.1002/ece3.490

Article de revue ; Article de revue à facteur d'impact Revue en libre accès total

Prévisualisation

Version publiée - Anglais
Utilisation soumise à autorisation de l'auteur ou du Cirad.
document_568569.pdf
Télécharger (489kB) | Prévisualisation

Quartile : Q3, Sujet : ECOLOGY

Résumé : Introduction events can lead to admixture between genetically differentiated populations and bottlenecks in population size. These processes can alter the adaptive potential of invasive species by shaping genetic variation, but more importantly, they can also directly affect mean population fitness either increasing it or decreasing it. Which outcome is observed depends on the structure of the genetic load of the species. The ladybird Harmonia axyridis is a good example of invasive species where introduced populations have gone through admixture and bottleneck events. We used laboratory experiments to manipulate the relatedness among H. axyridis parental individuals to assess the possibility for heterosis or outbreeding depression in F1 generation offspring for two traits related to fitness (lifetime performance and generation time). We found that inter-populations crosses had no major impact on the lifetime performance of the offspring produced by individuals from either native or invasive populations. Significant outbreeding depression was observed only for crosses between native populations for generation time. The absence of observed heterosis is indicative of a low occurrence of fixed deleterious mutations within both the native and invasive populations of H. axyridis. The observed deterioration of fitness in native inter-population crosses most likely results from genetic incompatibilities between native genomic backgrounds. We discuss the implications of these results for the structure of genetic load in H. axyridis in the light of the available information regarding the introduction history of this species.

Mots-clés Agrovoc : Harmonia axyridis, introduction d'animaux, espèce envahissante, organisme indigène, écologie animale, génétique des populations, vigueur hybride, inbreeding, outbreeding

Mots-clés géographiques Agrovoc : France, Fédération de Russie, États-Unis d'Amérique, Japon, Afrique du Sud

Classification Agris : L20 - Écologie animale
H01 - Protection des végétaux - Considérations générales
000 - Autres thèmes

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations