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Multilocus phylogeny and systematics of Iberian endemic Squalius (Actinopterygii, Leuciscidae)
Author(s) -
Perea Silvia,
SousaSantos Carla,
Robalo Joana,
Doadrio Ignacio
Publication year - 2020
Publication title -
zoologica scripta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.204
H-Index - 64
eISSN - 1463-6409
pISSN - 0300-3256
DOI - 10.1111/zsc.12420
Subject(s) - coalescent theory , supermatrix , biology , polyphyly , monophyly , phylogenetic tree , evolutionary biology , phylogenetics , nuclear gene , systematics , molecular phylogenetics , lineage (genetic) , zoology , genome , genetics , taxonomy (biology) , gene , clade , mathematics , affine lie algebra , pure mathematics , current algebra , algebra over a field
Inferring the evolutionary history of a group of species can be challenging given the many factors involved. In recent years, the increased availability of sequences of multiple genes per species has spurred the development of new methodologies to analyse multilocus data sets. Two approaches that analyse such data are concatenated supermatrix and coalescent‐based species‐tree analyses. In this study, we used both of these methods to infer the phylogenetic relationships of Iberian species of the genus Squalius from one mitochondrial and six nuclear genes. We found mitonuclear discordance in the phylogenetic relationships of the group. According to the mitochondrial gene analysis, all species were recovered as monophyletic except S. pyrenaicus ; besides, in the concatenated supermatrix analysis of the nuclear markers, this species resolved as polyphyletic with three divergent evolutionary lineages. The coalescent‐based nuclear species‐tree analysis rendered a well‐resolved phylogeny compared with the supermatrix analysis, which was unable to discern between S. carolitertii , S. castellanus and one of the evolutionary lineages of S. pyrenaicus . This result is likely due to the better integration of population uncertainty in the coalescent approach. Furthermore, Bayesian multilocus species delimitation analyses based on a BPP approach strongly supported the distinct nuclear lineages as different species. Nevertheless, the supermatrix analysis was able to obtain well‐supported relationships in the divergent lineages with low numbers of individuals. Our study highlights the usefulness of different analytical methodologies to obtain a more complete picture of the evolutionary history of taxa, especially when discordant patterns among genes are found.