Original Paper

Marine Biology

, Volume 160, Issue 5, pp 1285-1296

First online:

Global population divergence of the sea star Hippasteria phrygiana corresponds to the onset of the last glacial period of the Pleistocene

  • D. W. FoltzAffiliated withDepartment of Biological Sciences, Louisiana State University Email author 
  • , S. D. FatlandAffiliated withDepartment of Biological Sciences, Louisiana State University
  • , M. EléaumeAffiliated withDépartement Peuplement et Milieux Aquatiques, Muséum national d’Histoire naturelle
  • , K. MarkelloAffiliated withDepartment of Invertebrate Zoology and Geology, California Academy of Sciences
  • , K. L. HowellAffiliated withMarine Biology and Ecology Research Centre, Marine Institute, University of Plymouth
  • , K. NeillAffiliated withNational Institute of Water and Atmospheric Research
  • , C. L. MahAffiliated withDepartment of Biological Sciences, Louisiana State UniversityDepartment of Invertebrate Zoology, National Museum of Natural History

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Genetic structure and connectivity of populations of the globally distributed and eurybathic sea star Hippasteria phrygiana (Parelius 1768) were studied in 165 individuals sampled from three oceanic regions: the North Pacific Ocean, the South Pacific Ocean (considered to include the adjacent regions of the Southern Ocean and the southern Indian Ocean) and the North Atlantic Ocean. A nuclear gene region (ATP synthase subunit α intron #5, ATPSα) and a mitochondrial gene region (cytochrome oxidase subunit I, COI) were amplified and sequenced. Significant heterogeneity was detected in an AMOVA analysis among the three sampled oceanic regions for COI, but not for ATPSα. Neither gene showed significant genetic heterogeneity within the North Atlantic, as assessed by ΦST values. Significant heterogeneity was detected for COI (but not ATPSα) in the North Pacific, but the converse was true in the South Pacific. Coalescent simulations suggested that the three regions have been diverging with little or no gene flow for the past 50–75,000 years, a time frame that corresponds to the onset of the last glacial period of the Pleistocene. A possible genetic signature of recent population expansion (or non-neutrality) was detected for each gene in the North Pacific, but not in the other two oceanic regions.