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Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments

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Dispersal ability, population genetic structure and species divergence in marine nematodes are still poorly understood, especially in remote areas such as the Southern Ocean. We investigated genetic differentiation of species and populations of the free-living endobenthic nematode genera Sabatieria and Desmodora using nuclear 18S rDNA, internal transcribed spacer (ITS) rDNA, and mitochondrial cytochrome oxidase I (COI) gene sequences. Specimens were collected at continental shelf depths (200–500 m) near the Antarctic Peninsula, Scotia Arc and eastern side of the Weddell Sea. The two nematode genera co-occurred at all sampled locations, but with different vertical distribution in the sediment. A combination of phylogenetic (GMYC, Bayesian Inference, Maximum Likelihood) and population genetic (AMOVA) analyses were used for species delimitation and assessment of gene flow between sampling locations.
Original languageEnglish
Article number120
JournalBMC Evolutionary Biology
Volume17
Issue number1
Pages (from-to)2-14
Number of pages13
DOIs
Publication statusPublished - 2017

    Research areas

  • B320-zoogeography
  • B330-phylogeny

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