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Drivers and dynamics of a massive adaptive radiation in cichlid fishes

Ronco, Fabrizia and Matschiner, Michael and Böhne, Astrid and Boila, Anna and Büscher, Heinz H. and El Taher, Athimed and Indermaur, Adrian and Malinsky, Milan and Ricci, Virginie and Kahmen, Ansgar and Jentoft, Sissel and Salzburger, Walter. (2020) Drivers and dynamics of a massive adaptive radiation in cichlid fishes. Nature, 589. pp. 86-81.

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Abstract

Adaptive radiation is the likely source of much of the ecological and morphological diversity of life; 1-4; . How adaptive radiations proceed and what determines their extent remains unclear in most cases; 1,4; . Here we report the in-depth examination of the spectacular adaptive radiation of cichlid fishes in Lake Tanganyika. On the basis of whole-genome phylogenetic analyses, multivariate morphological measurements of three ecologically relevant trait complexes (body shape, upper oral jaw morphology and lower pharyngeal jaw shape), scoring of pigmentation patterns and approximations of the ecology of nearly all of the approximately 240 cichlid species endemic to Lake Tanganyika, we show that the radiation occurred within the confines of the lake and that morphological diversification proceeded in consecutive trait-specific pulses of rapid morphospace expansion. We provide empirical support for two theoretical predictions of how adaptive radiations proceed, the 'early-burst' scenario; 1,5; (for body shape) and the stages model; 1,6,7; (for all traits investigated). Through the analysis of two genomes per species and by taking advantage of the uneven distribution of species in subclades of the radiation, we further show that species richness scales positively with per-individual heterozygosity, but is not correlated with transposable element content, number of gene duplications or genome-wide levels of selection in coding sequences.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Evolutionary Biology (Salzburger)
UniBasel Contributors:Salzburger, Walter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer nature
ISSN:0028-0836
e-ISSN:1476-4687
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
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Last Modified:08 Feb 2021 07:58
Deposited On:05 Feb 2021 11:11

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