title: Nocturnal claroteine catfishes reveal dual colonisation but a single radiation in Lake Tanganyika.
abstract: Lake Tanganyika (LT) is a biodiversity hotspot supporting many endemic radiations that provide comparative systems in which to investigate if there are common factors leading to the build-up of its considerable diversity. Despite LT containing the highest diversity of lacustrine catfishes on Earth, the evolutionary relationships of nocturnal catfishes within the sub-family Claroteinae have not been investigated and it is unknown if its constituent genera have diversified via single or independent colonisation events. We report the first molecular phylogeny of the LT claroteine catfishes based on a multigene dataset (three nuclear markers, two mitochondrial totalling 4227 bp), including 85 samples from LT and outside of the lake basin. These data support LT claroteine monophyly, with the exclusion of the LT endemic Chrysichthys brachynema that independently colonised the lake but has not radiated. Multiple sampling localities from LT and the use of Bayesian species delimitation methods reveal additional locally restricted diversity within the LT Claroteinae clade. Fossil calibrated molecular divergence dates suggest that diversification occurred within full lake conditions as demonstrated in other LT lineages.
authors: Department of Genetics, Evolution & Environment, University College London, Gower Street, London WC1E 6BT, UK; Department of Life Sciences, The Natural History Museum, Cromwell Road, South Kensington, London SW7 5BD, UK. Electronic address: claire.peart.09@ucl.ac.uk.
authors: Claire R
authors: CR
authors: Peart
authors: South African Institute for Aquatic Biodiversity, Private Bag 1015, 6140 Grahamstown, South Africa. Electronic address: r.bills@saiab.ac.za.
authors: Roger
authors: R
authors: Bills
authors: Department of Life Sciences, The Natural History Museum, Cromwell Road, South Kensington, London SW7 5BD, UK. Electronic address: m.wilkinson@nhm.ac.uk.
authors: Mark
authors: M
authors: Wilkinson
authors: Department of Genetics, Evolution & Environment, University College London, Gower Street, London WC1E 6BT, UK. Electronic address: j.day@ucl.ac.uk.
authors: Julia J
authors: JJ
authors: Day
mesh_terms: D000349:Africa; D000818:Animals; D001499:Bayes Theorem; D044822:Biodiversity; D002397:Catfishes / Q000145:classification / Q000235:genetics* / Q000502:physiology*; D004272:DNA, Mitochondrial / Q000235:genetics; D003624:Darkness; D017753:Ecosystem; D005580:Fossils; D060106:Lakes; D010802:Phylogeny; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial
keywords: Africa; Diversification; Lake Tanganyika; Siluriformes; Species delimitation