Stratified dispersal and increasing genetic variation during the invasion of central Europe by the western corn rootworm, iDiabrotica virgifera virgifera-iReportar como inadecuado




Stratified dispersal and increasing genetic variation during the invasion of central Europe by the western corn rootworm, iDiabrotica virgifera virgifera-i - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 UMR 1301 Interactions Biotiques en Santé Végétale 2 Genetics Laboratory 3 Corn Insects and Crop Genetics Research Unit 4 Plant protection directorate 5 CBGP - Centre de Biologie pour la Gestion des Populations

Abstract : Invasive species provide opportunities for investigating evolutionary aspects of colonization processes, including initial foundations of populations and geographic expansion. Using microsatellite markers and historical information, we characterized the genetic patterns of the invasion of the western corn rootworm WCR, a pest of corn crops, in its largest area of expansion in Europe: Central and South-Eastern CSE Europe. We found that the invaded area probably corresponds to a single expanding population resulting from a single introduction of WCR and that gene flow is geographically limited within the population. In contrast to what is expected in classical colonization processes, an increase in genetic variation was observed from the center to the edge of the outbreak. Control measures against WCR at the center of the outbreak may have decreased effective population size in this area which could explain this observed pattern of genetic variation. We also found that small remote outbreaks in southern Germany and north-eastern Italy most likely originated from long-distance dispersal events from CSE Europe. We conclude that the large European outbreak is expanding by stratified dispersal, involving both continuous diffusion and discontinuous long-distance dispersal. This latter mode of dispersal may accelerate the expansion of WCR in Europe in the future

Keywords : DIABROTICA VIRGIFERA COLEOPTERA CHRYSOMELIDAE DISPERSAL INVASIVE SPECIES LONG DISTANCE DISPERSAL MICROSATELLITES RANGE EXPANSION SPATIAL GENETIC PATTERN





Autor: Marc Ciosi - N.J. Miller - S. Toepfe - Arnaud Estoup - Thomas Guillemaud -

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



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