Journal of Oceanography

, Volume 62, Issue 2, pp 185–196 | Cite as

Lethality of increasing CO2 levels on deep-sea copepods in the western North Pacific

  • Yuji Watanabe
  • Atsushi Yamaguchi
  • Hiroshi Ishida
  • Takashi Harimoto
  • Shinya Suzuki
  • Yoshio Sekido
  • Tsutomu Ikeda
  • Yoshihisa Shirayama
  • Masayuki Mac Takahashi
  • Takashi Ohsumi
  • Joji Ishizaka


The first CO2 exposure experiments on several species of pelagic copepods inhabiting surface and deep layers in the western North Pacific were conducted. Living organisms were collected from two layers between the surface and 1,500 m between latitudes of 11 and 44°N, and they were exposed aboard ship to various pCO2 up to about 98,000 μatm. Mortality of copepods from both shallow and deep layers in subarctic to subtropical regions increased with increasing pCO2 and exposure time. Deep-living copepods showed higher tolerance to pCO2 than shallow-living copepods. Furthermore, deep-living copepods from subarctic and transitional regions had higher tolerances than the subtropical copepods. The higher tolerances of the deep-living copepods from subarctic and transitional regions may be due to the adaptation to the natural pCO2 conditions in the subarctic ocean.


Lethality pCO2 epipelagic mesopelagic copepod pH 


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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Yuji Watanabe
    • 1
    • 2
  • Atsushi Yamaguchi
    • 3
  • Hiroshi Ishida
    • 1
  • Takashi Harimoto
    • 1
  • Shinya Suzuki
    • 1
  • Yoshio Sekido
    • 1
  • Tsutomu Ikeda
    • 3
  • Yoshihisa Shirayama
    • 4
  • Masayuki Mac Takahashi
    • 5
  • Takashi Ohsumi
    • 6
  • Joji Ishizaka
    • 7
  1. 1.The General Environmental Technos Co., Ltd.Azuchimachi, Chuo-ku, OsakaJapan
  2. 2.Graduate School of Marine Science and EngineeringNagasaki UniversityBunkyo-machi, NagasakiJapan
  3. 3.Graduate School of Fisheries SciencesHokkaido UniversityMinato-cho, HakodateJapan
  4. 4.Field Science Education and Research CenterKyoto UniversityShirahama, Nishimuro, WakayamaJapan
  5. 5.Graduate School of Kuroshio SciencesKochi UniversityNangoku, KochiJapan
  6. 6.Research Institute of Innovative Technology for the Earth (RITE)Kizu, Soraku, KyotoJapan
  7. 7.Faculty of FisheriesNagasaki UniversityBunkyo-machi, NagasakiJapan

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