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Geographical ancestry of Lake Malawi's cichlid fish diversity

Genner, M.J. and Ngatunga, B.P. and Mzighani, S. and Smith, A. and Turner, G.F. (2015) Geographical ancestry of Lake Malawi's cichlid fish diversity. Biology Letters, 11 (6). Article Number: 20150232. DOI: 10.1098/rsbl.2015.0232

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Abstract

The Lake Malawi haplochromine cichlid flock is one of the largest vertebrate adaptive radiations. The geographical source of the radiation has been assumed to be rivers to the south and east of Lake Malawi, where extant representatives of the flock are now present. Here, we provide mitochondrial DNA evidence suggesting the sister taxon to the Lake Malawi radiation is within the Great Ruaha river in Tanzania, north of Lake Malawi. Estimates of the time of divergence between the Lake Malawi flock and this riverine sister taxon range from 2.13 to 6.76 Ma, prior to origins of the current radiation 1.20�4.06 Ma. These results are congruent with evaluations of 2�3.75 Ma fossil material that suggest past faunal connections between Lake Malawi and the Ruaha. We propose that ancestors of the Malawi radiation became isolated within the catchment during Pliocene rifting that formed both Lake Malawi and the Kipengere/Livingstone mountain range, before colonizing rivers to the south and east of the lake region and radiating within the lake basin. Identification of this sister taxon allows tests of whether standing genetic diversity has predisposed Lake Malawi cichlids to rapid speciation and adaptive radiation.

Item Type: Article
Subjects: Research Publications
Departments: College of Natural Sciences > School of Biological Sciences
Date Deposited: 09 Sep 2015 02:18
Last Modified: 23 Sep 2015 02:46
ISSN: 1744-9561
URI: http://e.bangor.ac.uk/id/eprint/5312
Identification Number: DOI: 10.1098/rsbl.2015.0232
Publisher: The Royal Society
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