Exon-based Phylogenomics and the Relationships of African Cichlid Fishes: Tackling the Challenges of Reconstructing Phylogenies with Repeated Rapid Radiations

  • Viviana Astudillo-Clavijo
    University of Toronto Department of Ecology and Evolutionary Biology, , 25 Willcocks St., Toronto, ON M5S 3B2, Canada
  • Melanie L J Stiassny
    American Museum of Natural History Department of Ichthyology, , 200 Central Park West, New York, NY 10024-5102, USA
  • Katriina L Ilves
    Canadian Museum of Nature Department of Zoology, , 240 McLeod St., Ottawa, ON K2P 2R1, Canada
  • Zuzana Musilova
    Charles University in Prague Department of Zoology, , Vinicna 7, Prague, Central Bohemia, CZ-128 44, Czech Republic
  • Walter Salzburger
    University of Basel Department of Environmental Sciences, Zoological Institute, , Vesalgasse 1, CH-4051 Basel, Basel-Stadt, Switzerland
  • Hernán López-Fernández
    University of Toronto Department of Ecology and Evolutionary Biology, , 25 Willcocks St., Toronto, ON M5S 3B2, Canada

抄録

<jats:title>Abstract</jats:title> <jats:p>African cichlids (subfamily: Pseudocrenilabrinae) are among the most diverse vertebrates, and their propensity for repeated rapid radiation has made them a celebrated model system in evolutionary research. Nonetheless, despite numerous studies, phylogenetic uncertainty persists, and riverine lineages remain comparatively underrepresented in higher-level phylogenetic studies. Heterogeneous gene histories resulting from incomplete lineage sorting (ILS) and hybridization are likely sources of uncertainty, especially during episodes of rapid speciation. We investigate the relationships of Pseudocrenilabrinae and its close relatives while accounting for multiple sources of genetic discordance using species tree and hybrid network analyses with hundreds of single-copy exons. We improve sequence recovery for distant relatives, thereby extending the taxonomic reach of our probes, with a hybrid reference guided/de novo assembly approach. Our analyses provide robust hypotheses for most higher-level relationships and reveal widespread gene heterogeneity, including in riverine taxa. ILS and past hybridization are identified as the sources of genetic discordance in different lineages. Sampling of various Blenniiformes (formerly Ovalentaria) adds strong phylogenomic support for convict blennies (Pholidichthyidae) as sister to Cichlidae and points to other potentially useful protein-coding markers across the order. A reliable phylogeny with representatives from diverse environments will support ongoing taxonomic and comparative evolutionary research in the cichlid model system. [African cichlids; Blenniiformes; Gene tree heterogeneity; Hybrid assembly; Phylogenetic network; Pseudocrenilabrinae; Species tree.]</jats:p>

収録刊行物

  • Systematic Biology

    Systematic Biology 72 (1), 134-149, 2022-07-26

    Oxford University Press (OUP)

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