On the potential of population genetics to refine scales for locust management : S1016TH09 Integrated Pest Management

Chapuis Marie-Pierre, Berthier Karine, Popple Julie-Anne, Sword Gregory A.. 2012. On the potential of population genetics to refine scales for locust management : S1016TH09 Integrated Pest Management. In : XXIV International Congress of Entomology (ICE 2012), Daegu, Korea, August 19-25, 2012. s.l. : s.n., Résumé, 1 p. International Congress of Entomology. 24, Daegu, Corée du Sud, 19 Août 2012/25 Août 2012.

Note générale : Marie-Pierre Chapuis est l'expert invité du Cirad

Résumé : Linking demographic and genetic dispersal measures is of fundamental importance for movement ecology and evolution. However, such integration can be difficult, particularly for highly fecund species that are often the target of management decisions guided by an understanding of population movement. Here, we present an example of how the influence of large population sizes can preclude genetic approaches from assessing demographic population structuring, even at a continental scale. The Australian plague locust, Chortoicetes terminifera, is a significant pest, with populations on the eastern and western sides of Australia having been monitored and managed independently to date. We used microsatellites to assess genetic variation in 12 C. terminifera population samples separated by up to 3000 km. Traditional summary statistics indicated high levels of genetic diversity and a surprising lack of population structure across the entire range. An approximate Bayesian computation treatment indicated that levels of genetic diversity in C. terminifera corresponded to effective population sizes conservatively composed of tens of thousands to several million individuals. We used these estimates and computer simulations to estimate the minimum rate of dispersal that could account for the observed range-wide genetic homogeneity.

Classification Agris : H10 - Ravageurs des plantes

Auteurs et affiliations

• Chapuis Marie-Pierre, CIRAD-BIOS-UPR Bioagresseurs (FRA)
• Berthier Karine, INRA (FRA)
• Popple Julie-Anne, University of Sydney (AUS)
• Sword Gregory A., Texas A & M University (USA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/568194/)

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