title: Speciation by distance in a ring species.
abstract: Ring species, which consist of two reproductively isolated forms connected by a chain of intergrading populations, have often been described as examples of speciation despite gene flow between populations, but this has never been demonstrated. We used amplified fragment length polymorphism (AFLP) markers to study gene flow in greenish warblers (Phylloscopus trochiloides). These genetic markers show distinct differences between two reproductively isolated forms but gradual change through the ring connecting these forms. These findings provide the strongest evidence yet for "speciation by force of distance" in the face of ongoing gene flow.
authors.affiliation: Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, Canada V6T 1Z4. irwin@zoology.ubc.ca
authors.forename: Darren E
authors.initials: DE
authors.lastname: Irwin
authors.forename: Staffan
authors.initials: S
authors.lastname: Bensch
authors.forename: Jessica H
authors.initials: JH
authors.lastname: Irwin
authors.forename: Trevor D
authors.initials: TD
authors.lastname: Price
mesh_terms: D000220:Adaptation, Biological; D000818:Animals; D005075:Biological Evolution; D016172:DNA Fingerprinting; D004272:DNA, Mitochondrial / Q000235:genetics; D005819:Genetic Markers; D014644:Genetic Variation; D005828:Genetics, Population; D005843:Geography; D046109:Passeriformes / Q000145:classification* / Q000235:genetics* / Q000502:physiology; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012098:Reproduction; D012641:Selection, Genetic; D012800:Siberia
chemical_list: D004272:DNA, Mitochondrial; D005819:Genetic Markers