Molecular identification of redfish (genus Sebastes ) in the White Sea indicates patterns of introgressive hybridisation
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COMMENT
Molecular identification of redfish (genus Sebastes) in the White Sea indicates patterns of introgressive hybridisation Peter Shum1 · Christophe Pampoulie2 Received: 3 April 2020 / Revised: 3 July 2020 / Accepted: 11 July 2020 © The Author(s) 2020
Abstract The rare occurrence of redfish (genus Sebastes) in the White Sea encouraged Rolskii et al. (Polar Biol 43:385–389, 2020) to investigate the species identity of two animals captured near the Sredniy Island at 40 m depth. They reported that their morphological description proved unreliable and that genetic evidence “clearly demonstrated” these redfish belong to S. norvegicus. This was inferred using the S7 and the mitochondrial control region genes. However, while their S7 matched one S. norvegicus reference sequence, the S. norvegicus mitochondrial reference sequences used to infer species identity were previously shown to cluster with S. mentella. Therefore, both of their redfish samples belong to a S. norvegicus × S. mentella (deep-pelagic) hybrid which presents an interesting perspective into the complex species dynamics in this group. Keywords Sebastes · redfish · hybridisation · White Sea North Atlantic (NA) Sebastes are remarkably similar in external appearance and the absence of clear diagnostic morphological characters can obscure an accurate species assessment whereby phenotypic plasticity and hybridisation has blurred morphological limits of detection (Pampoulie and Daníelsdóttir 2008; Christensen et al. 2018). Therefore, it is reasonable to expect that misidentification occurs regularly and the resulting conclusions are hindered by taxonomic bias. Artamonova et al. (2013) documented some of the earliest mitochondrial DNA control region (or D-loop) sequence records for NA Sebastes from a small collection of samples. They characterised species, and subsequently sequence records, according to geographic distribution, morphology and allozyme analysis. However, they were This is a comment to Rolskii, A.Y., Artamonova, V.S. and Makhrov, A.A., 2020. Molecular identification ofgolden redfish (Sebastes norvegicus) in the White Sea. Polar Biology, pp.1-5. DOI:https://doi.org/10.1007/s00300-020-02629-y * Peter Shum [email protected] Christophe Pampoulie [email protected] 1
School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool L3 3AF, UK
Marine and Freshwater Research Institute, Fornubúðir 5, 220 Hafnarfjörður, Iceland
2
unable to unambiguously separate S. mentella from S. norvegicus based on their allozyme analysis and morphological assessments have been known to be ambiguous (Pampoulie and Daníelsdóttir 2008). Later, Shum et al. (2015) greatly expanded the mitochondrial D-loop sequence record by investigating the phylogeographic distribution of S. mentella in the NA, and screened over 250 samples generating 55 mitochondrial D-loop haplotypes as well as reference sequences (verified using microsatellite & mitochondrial DNA) for S. viviparus, S. fasciatus and S. norvegicus. In a fol
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