Journal of Oceanography

, Volume 62, Issue 5, pp 639–648 | Cite as

Cycladophora davisiana (Radiolaria) in the Okhotsk Sea: A key for reconstructing glacial ocean conditions

  • Yusuke Okazaki
  • Osamu Seki
  • Takeshi Nakatsuka
  • Tatsuhiko Sakamoto
  • Minoru Ikehara
  • Kozo Takahashi
Original Articles

Abstract

Cycladophora davisiana, a radiolarian species dwelling at mesopelagic depths, is known as a representative glacial fauna due to its unique distribution during glacial periods. In the present ocean, abundant production of C. davisiana is only observed in the Okhotsk Sea, indicating an adaptation of C. davisiana for seasonal sea-ice covered conditions. We found pronounced abundant production of C. davisiana during the early to middle Holocene in the Okhotsk Sea, suggesting more favorable conditions for C. davisiana than the present Okhotsk Sea. In order to clarify the reason, oceanographic conditions during the Holocene were reconstructed based on biomarkers, lithogenic grains including ice-rafted debris (IRD), biogenic opal, and total organic carbon (TOC) in two sediment cores from the Okhotsk Sea. These indicators suggest that the pronounced C. davisiana production may be attributed to: 1) a supply to mesopelagic depths under intensified stratification of fine organic particles derived from coccolithophorids, bacteria, and detrital materials; and 2) cold, well-ventilated intermediate water formation.

Keywords

Radiolaria intermediate water sea-ice stratification export production Okhotsk Sea 

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Copyright information

© The Oceanographic Society of Japan/TERRAPUB/Springer 2006

Authors and Affiliations

  • Yusuke Okazaki
    • 1
  • Osamu Seki
    • 2
  • Takeshi Nakatsuka
    • 3
  • Tatsuhiko Sakamoto
    • 4
  • Minoru Ikehara
    • 5
  • Kozo Takahashi
    • 6
  1. 1.Institute of Observational Research for Global ChangeJapan Agency for Marine-Earth Science and TechnologyNatsushima-cho, YokosukaJapan
  2. 2.Graduate School of Environmental ScienceHokkaido UniversityKita-ku, SapporoJapan
  3. 3.Institute of Low Temperature ScienceHokkaido UniversityKita-ku, SapporoJapan
  4. 4.Institute for Research on Earth EvolutionJapan Agency for Marine-Earth Science and TechnologyNatsushima-cho, YokosukaJapan
  5. 5.Center for Advanced Marine Core ResearchKochi UniversityMonobe, NankokuJapan
  6. 6.Department of Earth and Planetary Sciences, Graduate School of SciencesKyushu UniversityHakozaki, Higashi-ku, FukuokaJapan

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