title: Population genetic structure and male-biased dispersal in the queenless ant Diacamma cyaneiventre.
abstract: In this study we investigated the population genetic structure of the queenless ant Diacamma cyaneiventre. This species, lacking winged queens, is likely to have a restricted female dispersal. We used both mitochondrial and microsatellite markers to assess the consequence of such restricted female dispersal at three geographical scales: within a given locality (< 1 km), between localities within a given region (< 10 km) and between regions (> 36 km). Within a locality, a strong population structure was observed for mitochondrial DNA (mtDNA) whereas weak or nonexistent population genetic structure was observed for the microsatellites (around 5% of the value for mtDNA). Male gene flow was estimated to be about 20-30 times higher than female gene flow at this scale. At a larger spatial scale, very strong genetic differentiation for both markers was observed between localities - even within a single region. Female dispersal is nonexistent at these scales and male dispersal is very restricted, especially between regions. The phylogeographical structure of the mtDNA haplotypes as well as the very low genetic diversity of mtDNA within localities indicate that new sites are colonized by a single migration event from adjacent localities, followed by successive colony fissions. These patterns of genetic variability and differentiation agree with what is theoretically expected when colonization events are kin-structured and when, following colonization, dispersion is mainly performed by males.
authors.affiliation: Laboratoire d'Ecologie, UMR 7625 CNRS, Universite Pierre et Marie Curie, Bat. A 7eme étage, 7 quai St Bernard, F-75252 Paris Cedex 05, France. cdoums@snv.jussieu.fr
authors.forename: Claudie
authors.initials: C
authors.lastname: Doums
authors.forename: Humberto
authors.initials: H
authors.lastname: Cabrera
authors.forename: Christian
authors.initials: C
authors.lastname: Peeters
mesh_terms: D000818:Animals; D001000:Ants / Q000502:physiology*; D004272:DNA, Mitochondrial; D005260:Female; D014644:Genetic Variation; D005828:Genetics, Population; D006239:Haplotypes; D007194:India; D015810:Linkage Disequilibrium; D008297:Male; D018895:Microsatellite Repeats; D012744:Sex Ratio
chemical_list: D004272:DNA, Mitochondrial