Chapuis M.P., Lecoq M., Michalakis Yannis, Loiseau A., Sword G.A., Piry S., Estoup A. (2008). Do outbreaks affect genetic population structure ? A worldwide survey in Locusta migratoria, a pest plagued by microsatellite null alleles. Molecular Ecology, 17 (16), p. 3640-3653. ISSN 0962-1083.
Titre du document
Do outbreaks affect genetic population structure ? A worldwide survey in Locusta migratoria, a pest plagued by microsatellite null alleles
Chapuis M.P., Lecoq M., Michalakis Yannis, Loiseau A., Sword G.A., Piry S., Estoup A.
Source
Molecular Ecology, 2008,
17 (16), p. 3640-3653 ISSN 0962-1083
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.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Sciences du monde végétal [076]
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Sciences du monde animal [080]
