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Sr isotopic compositions of ayu otolith and its ambient water |
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| Authors: | Hiroshi Amakawa Takafumi Suzuki Toshiro Takahashi Yoshiyuki Tatsumi Tsuguo Otake |
| Institution: | 1. Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan 4. Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan, ROC 2. International Coastal Research Center (ICRC), Atmosphere and Ocean Research Institute, University of Tokyo, 2-106-1 Akahama, Otsuchi, Iwate, 028-11-2, Japan 3. Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushimacho, Yokosuka, 237-0061, Japan |
| Abstract: | Sr isotopic compositions of ayu otolith and water collected from Japanese rivers were measured to validate the relationship between otolith and ambient water for this species. Micromilling and rostrum-cut methods employed for otolith sampling were compared and yielded almost indistinguishable otolith Sr isotopic composition data. A good correlation observed between data on otolith and those on ambient water (river water and sea water) confirms the usefulness of Sr isotopic composition for elucidating migratory behavior of ayu, as already verified in other species. |
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