title: Sharp phylogeographic breaks and patterns of genealogical concordance in the brine shrimp Artemia franciscana.
abstract: Genealogical concordance is a critical overlay of all phylogenetic analyses, irrespective of taxonomic level. To assess such patterns of congruence we have compiled and derived sequence data for two mitochondrial (16S rRNA, COI) and two nuclear (ITS1, p26) markers in 14 American populations of the hypersaline branchiopod Artemia franciscana. Cladistic analysis revealed three reciprocally monophyletic mitochondrial clades. For nuclear DNA, incomplete lineage sorting was evident presumably as a result of slower coalescence or male-mediated dispersal. Our findings capture the genealogical interval between gene splitting and population divergence. In this sense, strong indications are provided in favour of a superspecies status and ongoing speciation in A. franciscana.
authors.affiliation: Department of Genetics, Development & Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 541 24, Greece.
authors.forename: Stefania
authors.initials: S
authors.lastname: Maniatsi
authors.affiliation: Department of Genetics, Development & Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 541 24, Greece.
authors.forename: Ilias
authors.initials: I
authors.lastname: Kappas
authors.affiliation: Department of Genetics, Development & Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 541 24, Greece.
authors.forename: Athanasios D
authors.initials: AD
authors.lastname: Baxevanis
authors.affiliation: Institute of Agrobiotechnology, Centre for Research and Technology, Thermi, 570 01, Thessaloniki, Greece.
authors.forename: Theodora
authors.initials: T
authors.lastname: Farmaki
authors.affiliation: Department of Genetics, Development & Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 541 24, Greece.
authors.forename: Theodore J
authors.initials: TJ
authors.lastname: Abatzopoulos
mesh_terms: D063147:Animal Distribution; D000818:Animals; D001156:Artemia / Q000145:classification* / Q000235:genetics*; D005260:Female; D050259:Genes, Mitochondrial; D049810:Genetic Speciation; D008297:Male; D010802:Phylogeny; D058974:Phylogeography; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012737:Sex Factors
chemical_list: D012336:RNA, Ribosomal, 16S