Molecular phylogeny of Oreochromis (Cichlidae: Oreochromini) reveals mito-nuclear discordance and multiple colonisation of adverse aquatic environments

Ford, Antonia G.P.; Bullen, Thomas R.; Pang, Longson; Genner, Martin J.; Bills, Roger; Flouri, Tomáš; Ngatunga, Benjamin P.; Rüber, Lukas; Schliewen, Ulrich K.; Seehausen, Ole; Shechonge, Asilatu; Stiassny, Melanie L.J.; Turner, George F.; Day, Julia J. (2019). Molecular phylogeny of Oreochromis (Cichlidae: Oreochromini) reveals mito-nuclear discordance and multiple colonisation of adverse aquatic environments. Molecular phylogenetics and evolution, 136, pp. 215-226. Elsevier 10.1016/j.ympev.2019.04.008

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Although the majority of cichlid diversity occurs in the African Great Lakes, these fish have also diversified across the African continent. Such continental radiations, occurring in both rivers and lakes have received far less attention than lacustrine radiations despite some members, such as the oreochromine cichlids (commonly referred to as ‘tilapia’), having significant scientific and socioeconomic importance both within and beyond their native range. Unique among cichlids, several species of the genus Oreochromis exhibit adaptation to soda conditions (including tolerance of elevated temperatures and salinity), which are of interest from evolutionary biology research and aquaculture perspectives. Questions remain regarding the factors facilitating the diversification of this group, which to date have not been addressed within a phylogenetic framework. Here we present the first comprehensive (32/37 described species) multi-marker molecular phylogeny of Oreochromis and closely related Alcolapia, based on mitochondrial (1583 bp) and nuclear (3092 bp) sequence data. We show widespread discordance between nuclear DNA and mitochondrial DNA trees. This could be the result of incomplete lineage sorting and/or introgression in mitochondrial loci, although we didn’t find a strong signal for the latter. Based on our nuclear phylogeny we demonstrate that adaptation to adverse conditions (elevated salinity, temperature, or alkalinity) has occurred multiple times within Oreochromis, but that adaptation to extreme (soda) conditions (high salinity, temperature, and alkalinity) has likely arisen once in the lineage leading to O. amphimelas and Alcolapia. We also show Alcolapia is nested within Oreochromis, which is in agreement with previous studies, and here revise the taxonomy to synonymise the genus in Oreochromis, retaining the designation as subgenus Oreochromis (Alcolapia).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)

UniBE Contributor:

Rüber, Lukas and Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

1055-7903

Publisher:

Elsevier

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

02 Jul 2019 07:44

Last Modified:

24 Oct 2019 11:23

Publisher DOI:

10.1016/j.ympev.2019.04.008

PubMed ID:

30974200

BORIS DOI:

10.7892/boris.130297

URI:

https://boris.unibe.ch/id/eprint/130297

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