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    • Evolutionary Relationships and Fine-Scale Geographic Structuring in the Temperate Percichthyid Genus Gadopsis (blackfishes) to Support Fisheries and Conservation Management

    Matthew A. Campbell,Michael P. Hammer,Mark Adams,Tarmo A. Raadik,Peter J. Unmack

    MOLECULAR PHYLOGENETICS AND EVOLUTION（2024）

    Univ Sydney

    Cited 0|Views10
    Abstract
    Gadopsis (Percichthyidae) is a freshwater genus distributed in south-eastern Australia, including Tasmania, and comprises two recognized species. Previous molecular phylogenetic investigations of the genus, mostly conducted in the pre-genomics era and reflecting a range of geographic and molecular sampling intensities, have supported the recognition of up to seven candidate species. Here we analyze a genome-wide SNP dataset that provides comprehensive geographic and genomic coverage of Gadopsis to produce a robust hypothesis of species boundaries and evolutionary relationships. We then leverage the SNP dataset to characterize relationships within candidate species that lack clear intraspecific phylogenetic relationships. We find further support for the seven previously identified candidate species of Gadopsis and evidence that the Bass Strait centered candidate species (SBA) originated from ancient hybridization. The SNP dataset permits a high degree of intraspecific resolution, providing improvements over previous studies, with numerous candidate species showing intraspecific divisions in phylogenetic analysis. Further population genetic analysis of the Murray-Darling candidate species (NMD) and SBA finds support for K = 6 and K = 7 genetic clusters, respectively. The SNP data generated for this study have diverse applications in natural resource management for these fishes of conservation concern.
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    Key words
    Genetic structure,Percichthyidae,Phylogeny,Phylogenetic networks,Population genomics,River blackfish,Two-spined blackfish
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