Journal article

Killer whale genomes reveal a complex history of recurrent admixture and vicariance.

  • Foote AD CMPG, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.
  • Martin MD NTNU University Museum, Trondheim, Norway.
  • Louis M Department of Biology, Section for Evolutionary Genomics, University of Copenhagen, Copenhagen, Denmark.
  • Pacheco G Department of Biology, Section for Evolutionary Genomics, University of Copenhagen, Copenhagen, Denmark.
  • Robertson KM Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California.
  • Sinding MS Department of Biology, Section for Evolutionary Genomics, University of Copenhagen, Copenhagen, Denmark.
  • Amaral AR American Museum of Natural History, New York City, New York.
  • Baird RW Cascadia Research, Olympia, Washington.
  • Baker CS Department of Fisheries and Wildlife, Marine Mammal Institute, Oregon State University, Newport, Oregon.
  • Ballance L Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California.
  • Barlow J Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California.
  • Brownlow A Scottish Marine Animal Stranding Scheme, SRUC Veterinary Services Drummondhill, Inverness, UK.
  • Collins T Ocean Giants Program, Wildlife Conservation Society, New York City, New York.
  • Constantine R School of Biological Sciences, University of Auckland, Auckland, New Zealand.
  • Dabin W Observatoire Pelagis, Université de La Rochelle-CNRS, La Rochelle, France.
  • Dalla Rosa L Laboratório de Ecologia e Conservação da Megafauna Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil.
  • Davison NJ Scottish Marine Animal Stranding Scheme, SRUC Veterinary Services Drummondhill, Inverness, UK.
  • Durban JW Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California.
  • Esteban R CIRCE, Conservation, Information and Research on Cetaceans, Algeciras, Spain.
  • Ferguson SH Fisheries & Oceans Canada, Winnipeg, Manitoba, Canada.
  • Gerrodette T Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California.
  • Guinet C Centre d'Etudes Biologiques de Chizé (CEBC), CNRS-ULR, UMR, Chizé, France.
  • Hanson MB National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Northwest Fisheries Science Center, Seattle, Washington.
  • Hoggard W National Marine Fisheries Service, NOAA, Southeast Fisheries Science Center, Pascagoula, Mississippi.
  • Matthews CJD Fisheries & Oceans Canada, Winnipeg, Manitoba, Canada.
  • Samarra FIP Marine and Freshwater Research Institute, Reykjavík, Iceland.
  • de Stephanis R CIRCE, Conservation, Information and Research on Cetaceans, Algeciras, Spain.
  • Tavares SB Scottish Oceans Institute, East Sands, University of St. Andrews, St. Andrews, UK.
  • Tixier P Centre d'Etudes Biologiques de Chizé (CEBC), CNRS-ULR, UMR, Chizé, France.
  • Totterdell JA Marine Information and Research Group-Australia (MIRG), Quinns Rocks, Western Australia, Australia.
  • Wade P National Marine Mammal Laboratory, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Alaska Fisheries Science Center, Seattle, Washington.
  • Excoffier L CMPG, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.
  • Gilbert MTP NTNU University Museum, Trondheim, Norway.
  • Wolf JBW Division of Evolutionary Biology, Faculty of Biology, LMU Munich, Planegg-Martinsried, Germany.
  • Morin PA Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California.
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  • 2019-05-28
Published in:
  • Molecular ecology. - 2019
English Reconstruction of the demographic and evolutionary history of populations assuming a consensus tree-like relationship can mask more complex scenarios, which are prevalent in nature. An emerging genomic toolset, which has been most comprehensively harnessed in the reconstruction of human evolutionary history, enables molecular ecologists to elucidate complex population histories. Killer whales have limited extrinsic barriers to dispersal and have radiated globally, and are therefore a good candidate model for the application of such tools. Here, we analyse a global data set of killer whale genomes in a rare attempt to elucidate global population structure in a nonhuman species. We identify a pattern of genetic homogenisation at lower latitudes and the greatest differentiation at high latitudes, even between currently sympatric lineages. The processes underlying the major axis of structure include high drift at the edge of species' range, likely associated with founder effects and allelic surfing during postglacial range expansion. Divergence between Antarctic and non-Antarctic lineages is further driven by ancestry segments with up to four-fold older coalescence time than the genome-wide average; relicts of a previous vicariance during an earlier glacial cycle. Our study further underpins that episodic gene flow is ubiquitous in natural populations, and can occur across great distances and after substantial periods of isolation between populations. Thus, understanding the evolutionary history of a species requires comprehensive geographic sampling and genome-wide data to sample the variation in ancestry within individuals.
Language
  • English
Open access status
green
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https://sonar.ch/global/documents/90012
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