title: Shallow genetic divergence and species delineations in the endemic Labeobarbus species flock of Lake Tana, Ethiopia.
abstract: To assess whether the species distinctions of Lake Tana's Labeobarbus spp. are supported by genetic information, microsatellite markers were used. A total of 376 Labeobarbus spp., belonging to 24 populations of 11 species from three regions of the lake (north, south and east), were sampled. Eight microsatellite markers were analysed. In general, differences between conspecific populations were smaller than differences between populations of different species. For six species, conspecific populations from different regions in the lake were consistently more similar than populations of other species from the same region. For four species this was not the case, while for one species two populations were similar, but different from the third population. River-spawning species appeared to be more distinct than presumed lake spawners. On the species level, there was a significant correlation between genetic and morphological differentiation, especially in morphological aspects associated with ecological functioning. This suggests that genetic differentiation arose together with adaptive radiation, although the overall genetic differentiation among the Lake Tana Labeobarbus spp. is small.
authors.affiliation: Wageningen University, Aquaculture and Fisheries Group, De Elst 1, 6708 WD, Wageningen, the Netherlands.
authors.forename: L A J
authors.initials: LA
authors.lastname: Nagelkerke
authors.affiliation: Wageningen University, Experimental Zoology Group, De Elst 1, 6708 WD, Wageningen, the Netherlands.
authors.forename: K M
authors.initials: KM
authors.lastname: Leon-Kloosterziel
authors.affiliation: Wageningen University, Animal Breeding and Genomics Centre, De Elst 1, 6708 WD, Wageningen, the Netherlands.
authors.forename: H-J
authors.initials: HJ
authors.lastname: Megens
authors.affiliation: Institute for Marine Resources and Ecosystem Studies (IMARES), Wageningen UR, Haringkade 1, 1970 AB, IJmuiden, the Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: De Graaf
authors.affiliation: Centro de Ciências do Mar, Marine Ecology and Evolution Group, Gambelas, 8005-139, Faro, Portugal.
authors.forename: O E
authors.initials: OE
authors.lastname: Diekmann
authors.affiliation: Wageningen University, Experimental Zoology Group, De Elst 1, 6708 WD, Wageningen, the Netherlands.
authors.forename: F A
authors.initials: FA
authors.lastname: Sibbing
mesh_terms: D000818:Animals; D003530:Cyprinidae / Q000235:genetics*; D005002:Ethiopia; D040961:Genetic Drift; D049810:Genetic Speciation; D014644:Genetic Variation; D060106:Lakes; D018895:Microsatellite Repeats; D045483:Rivers
keywords: Cyprinidae; genetic differentiation; microsatellites; speciation; species distinction