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Contrasting geographic structure in evolutionarily divergent Lake Tanganyika catfishes

Peart, CR; Dasmahapatra, KK; Day, JJ; (2018) Contrasting geographic structure in evolutionarily divergent Lake Tanganyika catfishes. Ecology and Evolution , 8 (5) pp. 2688-2697. 10.1002/ece3.3860. Green open access

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Abstract

Geographic isolation is suggested to be among the most important processes in the generation of cichlid fish diversity in East Africa’s Great Lakes, both through isolation by distance and fluctuating connectivity caused by changing lake levels. However, even broad scale phylogeographic patterns are currently unknown in many non-cichlid littoral taxa from these systems. To begin to address this, we generated restriction- site-associated DNA sequence (RADseq) data to investigate phylogeographic structure throughout Lake Tanganyika (LT) in two broadly sympatric rocky shore catfish species from independent evolutionary radiations with differing behaviors: the mouthbrooding claroteine, Lophiobagrus cyclurus, and the brood-parasite mochokid, Synodontis multi- punctatus. Our results indicated contrasting patterns between these species, with strong lake-wide phylogeographic signal in L. cyclurus including a deep divergence be- tween the northern and southern lake basins. Further structuring of these populations was observed across a heterogeneous habitat over much smaller distances. Strong population growth was observed in L. cyclurus sampled from shallow shorelines, sug- gesting population growth associated with the colonization of new habitats following lake-level rises. Conversely, S. multipunctatus, which occupies a broader depth range, showed little phylogeographic structure and lower rates of population growth. Our findings suggest that isolation by distance and/or habitat barriers may play a role in the divergence of non-cichlid fishes in LT, but this effect varies by species.

Type: Article
Title: Contrasting geographic structure in evolutionarily divergent Lake Tanganyika catfishes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/ece3.3860
Publisher version: http://doi.org/10.1002/ece3.3860
Language: English
Additional information: Copyright © 2018 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: catfishes, diversification, East African Great Lakes, lake-level fluctuations, Lake Tanganyika, Phylogeography, RADseq
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: https://discovery.ucl.ac.uk/id/eprint/1576202
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