Peart, Claire R;
Roger, Bills;
Jason, Newton;
Thomas, J Near;
Day, Julia J;
(2024)
Do sympatric catfish radiations in Lake Tanganyika show eco-morphological diversification?
Evolutionary Journal of the Linnean Society
, Article kzae015. 10.1093/evolinnean/kzae015.
(In press).
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Abstract
Adaptive radiation is characterised by eco-morphological differentiation, in which niche partitioning has been shown to be a central response to natural selection during the diversification of animal clades. This process is suggested to have generated the exceptional biodiversity in the East African rift lakes; however aside from the cichlid fishes, the nature of the divergence, over time, or among species is less clear in the other radiations. To address this, we focus on two distantly related sympatric Lake Tanganyika catfish clades, the genus Synodontis, considered to be Müllerian mimics, and the sub-family Claroteinae. We investigate to what extent, if any, these radiations have undergone eco-morphological diversification. We place these radiations in a common phylogenetic context, and test for morphological divergence and trophic niche partitioning using novel trait data and stable isotope signatures. Diversification of both catfish clades was recent, with the Synodontis radiation synchronised in time with individual genera within the claroteine radiation, suggesting initial diversification was facilitated by lake basin dynamics and/or lake level fluctuations. There is evidence for eco-morphological diversification within the claroteine radiation, as inferred from observed morphological disparity and divergence in diet both between and within genera; however, several species show significant overlap in dietary isotopic signatures. In contrast, the Synodontis radiation has greater overlap between taxa both in morphology and isotopic signatures potentially indicating niche conservatism, suggesting different selective forces maybe driving these radiations.
| Type: | Article |
|---|---|
| Title: | Do sympatric catfish radiations in Lake Tanganyika show eco-morphological diversification? |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/evolinnean/kzae015 |
| Publisher version: | https://doi.org/10.1093/evolinnean/kzae015 |
| Language: | English |
| Additional information: | © 2024 The Linnean Society of London. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| 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/10196126 |
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