Can things get worse when an invasive species hybridizes The harlequin ladybird iHarmonia axyridis-i in France as a case studyReport as inadecuate




Can things get worse when an invasive species hybridizes The harlequin ladybird iHarmonia axyridis-i in France as a case study - Download this document for free, or read online. Document in PDF available to download.

1 CBGP - Centre de Biologie pour la Gestion des Populations 2 Evolutionary Ecology Research Group, Department of Biology 3 UMR 1301 Interactions Biotiques en Santé Végétale 4 ENFA, EDB Laboratoire Evolution et Diversité Biologique 5 EDB Laboratoire Evolution et Diversité Biologique

Abstract : So far, only a few studies have explicitly investigated the consequences of admixture for the adaptative potential of invasive populations. We addressed this question in the invasive ladybird Harmonia axyridis. After decades of use as a biological control agent against aphids in Europe and North America, H. axyridis recently became invasive in four continents and has now spread widely in Europe. Despite this invasion, a flightless strain is still sold as a biological control agent in Europe. However, crosses between flightless and invasive individuals yield individuals able to fly, as the flightless phenotype is caused by a single recessive mutation. We investigated the potential consequences of admixture between invasive and flightless biological control individuals on the invasion in France. We used three complementary approaches: i population genetics, ii a mate-choice experiment, and iii a quantitative genetics experiment. The invasive French population and the biological control strain showed substantial genetic differentiation, but there are no reproductive barriers between the two. Hybrids displayed a shorter development time, a larger size and a higher genetic variance for survival in starvation conditions than invasive individuals. We discuss the potential consequences of our results with respect to the invasion of H. axyridis in Europe.

Keywords : ADMIXTURE BIOLOGICAL INVASION HARMONIA AXYRIDIS INTRASPECIFIC HYBRIDIZATION LIFE-HISTORY TRAITS QUANTITATIVE GENETICS  RELATION PLANTE-INSECTE INSECTE GENETIQUE DES POPULATIONS ESPECES INVASIVES





Author: Benoit Facon - Laurent Crespin - Anne Loiseau - Eric Lombaert - Alexandra Magro - Arnaud Estoup -

Source: https://hal.archives-ouvertes.fr/



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