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Recent speciation and hybridization in Icelandic deep‐sea isopods: An integrative approach using genomics and proteomics
Paulus, E.; Brix, S.; Siebert, A.; Martinez Arbizu, P.; Rossel, S.; Peters, J.; Svavarsson, J.; Schwentner, M. (2022). Recent speciation and hybridization in Icelandic deep‐sea isopods: An integrative approach using genomics and proteomics. Mol. Ecol. 31(1): 313-330.
In: Molecular Ecology. Blackwell: Oxford. ISSN 0962-1083; e-ISSN 1365-294X, more
Peer reviewed article  

Available in  Authors 

    Haploniscidae Hansen, 1916 [WoRMS]; Haploniscus bicuspis (G. O. Sars, 1877) [WoRMS]
Author keywords
    cryptic species; ddRAD; DNA barcoding; Haploniscidae; Haploniscus bicuspis; MALDI-TOF

Authors  Top 
  • Paulus, E.
  • Brix, S.
  • Siebert, A.
  • Martinez Arbizu, P., more
  • Rossel, S.
  • Peters, J.
  • Svavarsson, J.
  • Schwentner, M.

    The crustacean marine isopod species Haploniscus bicuspis (Sars, 1877) shows circum-Icelandic distribution in a wide range of environmental conditions and along well-known geographic barriers, such as the Greenland-Iceland-Faroe (GIF) Ridge. We wanted to explore population genetics, phylogeography and cryptic speciation as well as investigate whether previously described, but unaccepted subspecies have any merit. Using the same set of specimens, we combined mitochondrial COI sequences, thousands of nuclear loci (ddRAD), and proteomic profiles, plus selected morphological characters using confocal laser scanning microscopy (CLSM). Five divergent genetic lineages were identified by COI and ddRAD, two south and three north of the GIF Ridge. Assignment of populations to the three northern lineages varied and detailed analyses revealed hybridization and gene flow between them, suggesting a single northern species with a complex phylogeographic history. No apparent hybridization was observed among lineages south of the GIF Ridge, inferring the existence of two more species. Differences in proteomic profiles between the three putative species were minimal, implying an ongoing or recent speciation process. Population differentiation was high, even among closely associated populations, and higher in mitochondrial COI than nuclear ddRAD loci. Gene flow is apparently male-biased, leading to hybrid zones and instances of complete exchange of the local nuclear genome through immigrating males. This study did not confirm the existence of subspecies defined by male characters, which probably instead refer to different male developmental stages.

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