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Lack of genetic differentiation between contrasted overwintering strategies of a major pest predator Episyrphus balteatus (Diptera: Syrphidae): implications for biocontrol

Raymond, Lucie and Plantegenest, Manuel and Gauffre, Bertrand and Sarthou, Jean-Pierre and Vialatte, Aude Lack of genetic differentiation between contrasted overwintering strategies of a major pest predator Episyrphus balteatus (Diptera: Syrphidae): implications for biocontrol. (2013) PLoS ONE, vol. 8 (n° 9). ISSN 1932-6203

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Official URL: http://dx.doi.org/10.1371/journal.pone.0072997

Abstract

Winter ecology of natural enemies has a great influence on the level and efficiency of biological control at spring. The hoverfly Episyrphus balteatus (DeGeer) (Diptera: Syrphidae) is one of the most important natural predators of crop aphids in Europe. Three different overwintering strategies coexist in this species which makes it a good model in order to study ecologically-based speciation processes. The purpose of this study was to determine whether E. balteatus populations with alternative overwintering strategies are genetically differentiated. To that aim, we developed 12 specific microsatellite markers and evaluated the level of neutral genetic differentiation between E. balteatus field populations that overwinter in the three different ways described in this species (i.e. migration, local overwintering at a pre-imaginal stage, and local overwintering at adult stage). Results showed a lack of neutral genetic differentiation between individuals with different overwintering strategies although there are strong ecological differences between them. All pair-wise F-ST values are below 0.025 and non-significant, and Bayesian clustering showed K = 1 was the most likely number of genetic clusters throughout our sample. The three overwintering strategies form one unique panmictic population. This suggests that all the individuals may have genetic material for the expression of different overwintering phenotypes, and that their commitment in one particular overwintering strategy may depend on environmental and individual factors. Consequently, the prevalence of the different overwintering strategies would be potentially modified by landscape engineering and habitat management which could have major implications for biological control.

Item Type:Article
Additional Information:Thanks to PLS editor. The definitive version is available at https://www.plos.org/ The original PDF of the article can be found at PLoS ONE website : http://www.plosone.org/
ProdINRA Id:213741
Audience (journal):International journal (no peer-reviewed)
Uncontrolled Keywords:
Institution:Other partners > Agrocampus Ouest (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Other partners > Centre d'Etudes Biologiques de Chizé - CEBC (FRANCE)
Other partners > Université de La Rochelle (FRANCE)
Other partners > Université de Rennes 1 (FRANCE)
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Deposited By: INRA INRA
Deposited On:04 Nov 2016 11:18

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