Shallow genetic divergence and species delineations in the endemic Labeobarbus species flock of Lake Tana, Ethiopia

L.A.J. Nagelkerke, K.M. Leon-Kloosterziel, H.J.W.C. Megens, M. de Graaf, O.E. Diekmann, F.A. Sibbing

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)1191-1208
JournalJournal of Fish Biology
Volume87
Issue number5
DOIs
Publication statusPublished - 2015

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