Radiation with reproductive isolation in the near-absence of phylogenetic signal.

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Helmkampf, Martin ORCID: https://orcid.org/0000-0003-1995-9062, Coulmance, Floriane ORCID: https://orcid.org/0000-0002-8382-2610, Heckwolf, Melanie J. ORCID: https://orcid.org/0000-0002-7507-8895, Acero P., Arturo, Balard, Alice, Bista, Iliana, Dominguez, Omar Dominguez, Frandsen, Paul B., Torres-Oliva, Montserrat, Santaquiteria, Aintzane, Tavera, Jose, Victor, Benjamin C., Robertson, D. Ross, Betancur-R., Ricardo, McMillan, W. Owen and Puebla, Oscar ORCID: https://orcid.org/0000-0001-9700-5841 (2025) Radiation with reproductive isolation in the near-absence of phylogenetic signal. Science Advances, 11 (30). DOI https://doi.org/10.1126/sciadv.adt0973.

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Abstract

According to the genic view, species are characterized by the genes that underlie functional divergence. Here, we take a phylogenomic approach to assess this view at the scale of a whole radiation. The hamlets (Hypoplectrus spp.) represent a recent radiation of reef fishes from the Greater Caribbean that are reproductively isolated through assortative mating. A total of 335 genomes from 15 locations revealed a single well-supported phylogenetic split among species, with a large share of the radiation unresolved. The polytomic nature of the hamlet radiation is extreme compared to other recent radiations such as Lake Victoria cichlids. At the gene-tree level, we identified just one genomic region, centered around the casz1 transcription factor, with a topology that reflects species differences. These results show that phenotypic diversification and reproductive isolation—two major attributes of species—may unfold in the near-absence of phylogenetic signal, both genome-wide and at the gene-tree level.

Document Type: Article
Programme Area: PA1
Research affiliation: Ecology > Fish Ecology and Evolution
Refereed: Yes
Open Access Journal?: Yes
DOI: https://doi.org/10.1126/sciadv.adt0973
ISSN: 2375-2548
Date Deposited: 30 Jul 2025 15:00
Last Modified: 30 Jul 2025 15:00
URI: http://cris.leibniz-zmt.de/id/eprint/5688

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