Do outbreaks affect genetic population structure? A worldwide survey in Locusta migratoria, a pest plagued by microsatellite null alleles

Chapuis Marie-Pierre, Lecoq Michel, Michalakis Yannis, Loiseau Anne, Sword A., Piry Sylvain, Estoup Arnaud. 2008. Do outbreaks affect genetic population structure? A worldwide survey in Locusta migratoria, a pest plagued by microsatellite null alleles. Molecular Ecology, 17 (16) : 3640-3653.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : An understanding of the role of factors intrinsic to a species' life history in structuring contemporary genetic variation is a fundamental, but understudied, aspect of evolutionary biology. Here, we assessed the influence of the propensity to outbreak in shaping worldwide genetic variation in Locusta migratoria, a cosmopolitan pest well known for its expression of density-dependent phase polyphenism. We scored 14 microsatellites in nine subspecies from 25 populations distributed over most of the species' range in regions that vary in the historical frequency and extent of their outbreaks. We rejected the hypothesis that L. migratoria consists of two genetically distinct clusters adapted to habitats either rarely (nonoutbreaking) or cyclically (outbreaking) favourable to increases in population density. We also invalidated the current subspecific taxonomic classification based on morphometrics. Bayesian inferences indicated evidence of a homogenizing effect of outbreaks on L. migratoria population structure. Geographical and ecological barriers to gene flow in conjunction with historical events can also explain the observed patterns. By systematically assessing the effects of null alleles using computer simulations, we also provide a template for the analysis of microsatellite data sets characterized by a high prevalence of null alleles.

Mots-clés Agrovoc : Locusta migratoria, génétique des populations, microsatellite, distribution géographique, modèle de simulation, stade de développement animal, flux de gènes, phylogénie, habitat, écologie animale, épidémiologie, bioinformatique

Classification Agris : H10 - Ravageurs des plantes
L60 - Taxonomie et géographie animales
U10 - Informatique, mathématiques et statistiques
L40 - Anatomie et morphologie des animaux

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Chapuis Marie-Pierre, Montpellier SupAgro (FRA)
• Lecoq Michel, CIRAD-BIOS-UPR Acridologie (FRA)
• Michalakis Yannis, CNRS (FRA)
• Loiseau Anne, INRA (FRA)
• Sword A., University of Sydney (AUS)
• Piry Sylvain, INRA (FRA)
• Estoup Arnaud, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/545307/)

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