From speciation to introgressive hybridization: the phylogeographic structure of an island subspecies of termite, Reticulitermes lucifugus corsicus
Open Access
- 4 February 2008
- journal article
- Published by Springer Science and Business Media LLC in BMC Evolutionary Biology
- Vol. 8 (1), 38
- https://doi.org/10.1186/1471-2148-8-38
Abstract
Although much research has been carried out into European Reticulitermes taxonomy in recent years, there is still much discussion about phylogenetic relationships. This study investigated the evolution from intra- to interspecific phylogeny in the island subspecies Reticulitermes lucifugus corsicus and threw new light on this phenomenon. An integrative approach based on microsatellites and mitochondrial and nuclear DNA sequences was used to analyze samples taken from a wide area around the Tyrrhenian sea and showed how the subspecies evolved from its origins to its most recent form on continental coasts. According to mitochondrial phylogeny and molecular clock calculations, island and continental taxa diverged significantly by vicariance in the Pleistocene glacial period. However, more recently, numerous migrations, certainly human-mediated, affected the structure of the populations. This study provided evidence of direct hybridization and multiple introgressions which occurred in several hybrid areas. Analysis using STRUCTURE based on microsatellite data identified a population in Provence (France) which differed considerably (Fst = 0.477) from populations on the island of Corsica and in Tuscany in the Italian peninsula. This new population, principally distributed in urban areas, is highly heterogeneous especially within the ITS2 regions where homogenization by concerted evolution does not appear to have been completed. This study provides an unusual picture of genetic interaction between termite populations in the Tyrrhenian area and suggests that more attention should be paid to the role of introgression and human impact on the recent evolution of European termites.Keywords
This publication has 55 references indexed in Scilit:
- Phylogeography illuminates maternal origins of exotic Coptotermes gestroi (Isoptera: Rhinotermitidae)Molecular Phylogenetics and Evolution, 2007
- Dispersal and vicariance: The complex evolutionary history of boid snakesMolecular Phylogenetics and Evolution, 2006
- Distribution and genetic variation of Reticulitermes (Isoptera: Rhinotermitidae) in PortugalHeredity, 2006
- Intragenomic variation of the rDNA internal transcribed spacers in sponges (Phylum Porifera): implications for phylogenetic studiesMolecular Phylogenetics and Evolution, 2004
- Phylogeography of two European Reticulitermes (Isoptera) species: the Iberian refugiumMolecular Ecology, 2004
- Molecular Relationships among European Samples of Reticulitermes (Isoptera, Rhinotermitidae)Molecular Phylogenetics and Evolution, 2002
- Phylogenetic Analyses of Two Mitochondrial Genes and One Nuclear Intron Region Illuminate European Subterranean Termite (Isoptera: Rhinotermitidae) Gene Flow, Taxonomy, and Introduction DynamicsMolecular Phylogenetics and Evolution, 2001
- Evidence for reticulate palaeogeography: beetle diversity linked to connection‐disjunction cycles of the Gibraltar straitJournal of Biogeography, 2000
- CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and weight matrix choiceNucleic Acids Research, 1994
- A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequencesJournal of Molecular Evolution, 1980