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Lethality of increasing CO2 levels on deep-sea copepods in the western North Pacific |
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| Authors: | Yuji Watanabe Atsushi Yamaguchi Hiroshi Ishida Takashi Harimoto Shinya Suzuki Yoshio Sekido Tsutomu Ikeda Yoshihisa Shirayama Masayuki Mac Takahashi Takashi Ohsumi Joji Ishizaka |
| Institution: | (1) The General Environmental Technos Co., Ltd., Azuchimachi, Chuo-ku, Osaka 541-0052, Japan;(2) Graduate School of Marine Science and Engineering, Nagasaki University, Bunkyo-machi, Nagasaki 852-8521, Japan;(3) Graduate School of Fisheries Sciences, Hokkaido University, Minato-cho, Hakodate 041-8611, Japan;(4) Field Science Education and Research Center, Kyoto University, Shirahama, Nishimuro, Wakayama 649-2211, Japan;(5) Graduate School of Kuroshio Sciences, Kochi University, Nangoku, Kochi 783-8502, Japan;(6) Research Institute of Innovative Technology for the Earth (RITE), Kizu, Soraku, Kyoto 619-0292, Japan;(7) Faculty of Fisheries, Nagasaki University, Bunkyo-machi, Nagasaki 852-8521, Japan |
| Abstract: | 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. |
| Keywords: | Lethality pCO2 epipelagic mesopelagic copepod pH |
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