Polar Biology

, Volume 39, Issue 8, pp 1369–1379 | Cite as

Molecular data support the existence of two species of the Antarctic fish genus Cryodraco (Channichthyidae)

  • Alex Dornburg
  • Ron I. Eytan
  • Sarah Federman
  • Jillian N. Pennington
  • Andrew L. Stewart
  • Christopher D. Jones
  • Thomas J. Near
Original Paper

Abstract

Antarctic notothenioids represent one of the few strongly supported examples of adaptive radiation in marine fishes. The extent of population connectivity and structure is unknown for many species, thereby limiting our understanding of the factors that underlie speciation dynamics in this radiation. Here, we assess the population structure of the widespread species Cryodraco antarcticus and its sister species Cryodraco atkinsoni, whose taxonomic status is currently debated. Combining both population genetic and phylogenetic approaches to species delimitation, we provide evidence that C. atkinsoni is a distinct species. Our analyses show that C. atkinsoni and C. antarcticus are recently diverged sister lineages, and the two species differ with regard to patterns of population structure. A systematic and accurate account of species diversity is a critical prerequisite for investigations into the complex processes that underlie the history of speciation in the notothenioid adaptive radiation.

Keywords

Notothenioidei Pelagic larval dispersal Species delimitation Icefish 

Supplementary material

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Supplementary material 1 (DOCX 99 kb)
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Supplementary material 2 (PDF 1222 kb)
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Supplementary material 5 (PDF 1391 kb)
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Supplementary material 6 (FASTA 23 kb)
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Supplementary material 7 (DOCX 58 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Alex Dornburg
    • 1
  • Ron I. Eytan
    • 2
  • Sarah Federman
    • 3
  • Jillian N. Pennington
    • 4
  • Andrew L. Stewart
    • 5
  • Christopher D. Jones
    • 6
  • Thomas J. Near
    • 3
    • 7
  1. 1.Ichthyology UnitNorth Carolina Museum of Natural SciencesRaleighUSA
  2. 2.Department of Marine BiologyTexas A&M University at GalvestonGalvestonUSA
  3. 3.Department of Ecology and Evolutionary BiologyYale UniversityNew HavenUSA
  4. 4.Ezra Stiles CollegeYale UniversityNew HavenUSA
  5. 5.Museum of New Zealand Te Papa TongarewaWellingtonNew Zealand
  6. 6.Antarctic Ecosystem Research Division, Southwest Fisheries Science Center, National Marine Fisheries ServiceNational Oceanic and Atmospheric AdministrationLa JollaUSA
  7. 7.Peabody Museum of Natural HistoryYale UniversityNew HavenUSA

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