title: A single mitochondrial haplotype and nuclear genetic differentiation in sympatric colour morphs of a riverine cichlid fish.
abstract: Some of the diversity of lacustrine cichlid fishes has been ascribed to sympatric divergence, whereas diversification in rivers is generally driven by vicariance and geographic isolation. In the riverine Pseudocrenilabrus philander species complex, several morphologically highly distinct populations are restricted to particular river systems, sinkholes and springs in southern Africa. One of these populations consists of a prevalent yellow morph in sympatry with a less frequent blue morph, and no individuals bear intermediate phenotypes. Genetic variation in microsatellites and AFLP markers was very low in both morphs and one single mtDNA haplotype was fixed in all samples, indicating a very young evolutionary age and small effective population size. Nevertheless, the nuclear markers detected low but significant differentiation between the two morphs. The data suggest recent and perhaps sympatric divergence in the riverine habitat.
authors.affiliation: Department of Zoology, University of Graz, Graz, AustriaSection of Integrative Biology, University of Texas at Austin, Austin, TX, USADepartment of Biological Sciences, University of Zambia at Lusaka, Lusaka, ZambiaFaculty of Agriculture, University of Zagreb, Zagreb, Croatia.
authors.forename: S
authors.initials: S
authors.lastname: Koblmüller
authors.affiliation: Department of Zoology, University of Graz, Graz, AustriaSection of Integrative Biology, University of Texas at Austin, Austin, TX, USADepartment of Biological Sciences, University of Zambia at Lusaka, Lusaka, ZambiaFaculty of Agriculture, University of Zagreb, Zagreb, Croatia.
authors.forename: K M
authors.initials: KM
authors.lastname: Sefc
authors.affiliation: Department of Zoology, University of Graz, Graz, AustriaSection of Integrative Biology, University of Texas at Austin, Austin, TX, USADepartment of Biological Sciences, University of Zambia at Lusaka, Lusaka, ZambiaFaculty of Agriculture, University of Zagreb, Zagreb, Croatia.
authors.forename: N
authors.initials: N
authors.lastname: Duftner
authors.affiliation: Department of Zoology, University of Graz, Graz, AustriaSection of Integrative Biology, University of Texas at Austin, Austin, TX, USADepartment of Biological Sciences, University of Zambia at Lusaka, Lusaka, ZambiaFaculty of Agriculture, University of Zagreb, Zagreb, Croatia.
authors.forename: C
authors.initials: C
authors.lastname: Katongo
authors.affiliation: Department of Zoology, University of Graz, Graz, AustriaSection of Integrative Biology, University of Texas at Austin, Austin, TX, USADepartment of Biological Sciences, University of Zambia at Lusaka, Lusaka, ZambiaFaculty of Agriculture, University of Zagreb, Zagreb, Croatia.
authors.forename: T
authors.initials: T
authors.lastname: Tomljanovic
authors.affiliation: Department of Zoology, University of Graz, Graz, AustriaSection of Integrative Biology, University of Texas at Austin, Austin, TX, USADepartment of Biological Sciences, University of Zambia at Lusaka, Lusaka, ZambiaFaculty of Agriculture, University of Zagreb, Zagreb, Croatia.
authors.forename: C
authors.initials: C
authors.lastname: Sturmbauer
mesh_terms: D000818:Animals; D023681:Cichlids / Q000235:genetics*; D004272:DNA, Mitochondrial; D017753:Ecosystem; D005260:Female; D006239:Haplotypes; D008297:Male; D010858:Pigmentation / Q000235:genetics*; D011110:Polymorphism, Genetic; D015024:Zambia
chemical_list: D004272:DNA, Mitochondrial