Evolution of ditaom plankton provinces and surface water circulation systems in the Pacific Ocean

• Project/Area Number: 16540432
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: National Museum of Nature and Science, Tokyo
• Principal Investigator: TANIMURA Yoshihiro National Museum of Nature and Science, Tokyo, Dep. of Geology, Chief Curator (80141985)
• Co-Investigator(Kenkyū-buntansha): IWAI Masao Kochi Univ., Fac. of Science, Assoc. Prof. (90274357)
• Project Period (FY): 2004 – 2005
• Project Status: Completed (Fiscal Year 2005)
• Budget Amount: ¥3,200,000 (Direct Cost: ¥3,200,000); Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000); Fiscal Year 2004: ¥2,500,000 (Direct Cost: ¥2,500,000)
• Keywords: Pacific Ocean / Diatom / Province / Surface Water Circulation / プランクトン・プロビンス / 海洋

Research Abstract

Three varieties in a single species (Thalassionema nitzschioides var. incurvata, var. inflata and var. parva) of Family Thalassionemataceae were found to be characteristic of a surface water mass formed in the surface water circulation system of the modem North Pacific Ocean. Thalassionema nitzschioides var. incurvata, var. inflata and var. parva, which should be bundled into a single variety with their morphological continuity, dominate in wann saline water masses in the Subtropical Gyre.
Temporal and spacial distribution of the three varieties in DSDP-ODP cores in the western Pacific, together with two known hypotheses in evolution of surface water circulation systems (the gyral circulation system was weakly developed in the Early Miocene, and became stronger by the Late Miocene in association with closure of the Indonesian Seaway and intensification of the Kuroshio Current in the Middle Miocene, and prior to 2.5Ma the modern subarctic water mass did not exist at least in the western Pacific), suggest that changes in surface water circulation systems caused differentiations of plankton provinces, including temporal and spacial distribution of the three varieties. The three T. nitzschioides varieties, including T. hirosakiensis being in synonymy with T. nitzschioides var. inflata and var. parva, have been continuously present in both the northwestern Pacific and the eastern equatorial Pacific Ocean since a strong subtropical gyre formed in the Middle to Late Miocene. The three varieties continuously occurred in the early Late Miocene to Early Pliocene sequence which lie in the modern subarctic water mass, and the these varieties have been barren in the upper horizons of the sequences. The modern subarctic water mass formed after middle Pliocene might have acted as a barrier to northward migration of the three varieties.

Research Products

• [Journal Article] Cytoplasmic masses preserved in Early Holocene diatoms : a possible taphonomic process and its paleoecological implications. (2006)
  • Author(s): Tanimura, Y., Kato, M., Fukusawa, H., Mayama, S. & Yokoyama, K.
  • Journal Title: Jour. Phycology 42 Pages: 270-279
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Spatial variability in valve morphology of Neodenticula seminae, an oceanicdiatom in the subarctic North Pacific and Bering Sea. (2006)
  • Author(s): Shimada, C. & Tanimura, Y.
  • Journal Title: Paleontol. Res. 9 Pages: 79-89
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Seasonal variation in skeletal silicification of Neodenticula seminae, a marine planktonic diatom : Evidence based on sediment trap experiments in the northwestern Pacific Ocean '1997-2001. (2006)
  • Author(s): Shimada, C., Tanaka, Y. & Tanimura, Y.
  • Journal Title: Marine Micropaleontology Pages: 130-144
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Origin of remanent magnetization and magneto-biostratigraphy correlation in pelagic sediments, ODP Site 1225, eastern equatorial Pacific (2006)
  • Author(s): Niitsuma, S., Ford, K., Iwai, M., Chiyonobu, S., Sato, T.
  • Journal Title: Proc. ODP, Scientific Results 201
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Cytoplasmic masses preserved in Early Holocene diatoms : a possible taphonomic process and its paleoecoiogical implications. (2006)
  • Author(s): Tanimura, Y., Kato, M., Fukusawa, H., Mayama, S., Yokoyama, K.
  • Journal Title: Jour. Phycology 42 Pages: 270-279
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Spatial variability in valve morphology of Neodenticula seminae, an oceanic diatom in the subarctic North Pacific and Bering Sea. (2006)
  • Author(s): Shimada, C., Tanimura, Y.
  • Journal Title: Paleontol. Res. 9 (in press)
  • NAID: 110004729550
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Origin of remanent magnetization and magneto-biostratigraphy correlation in pelagic sediments, ODP Site 1225, eastern equatorial Pacific. (2006)
  • Author(s): Niitsuma, S., Ford, K., Iwai, M., Chiyonobu, S., Sato, T
  • Journal Title: Proc. ODP, Scientific Results 201 (in press)
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Cytoplasmic masses preserved in Early Holocene diatoms: a possible taphonomic process and its paleoecological implications. (2006)
  • Author(s): Tanimura, Y., Kato, M., Fukusawa, H., Mayama, S., Yokoyama, K.
  • Journal Title: Journal of Phycology 42(in press)
• [Journal Article] Spatial variability in valve morphology of Neodenticula seminae, an oceanic diatom in the subarctic North Pacific and Bering Sea. (2006)
  • Author(s): Shimada, C., Tanimura, Y.
  • Journal Title: Paleontological Research 9(in press)
  • NAID: 110004729550
• [Journal Article] Locations of type specimens and collections of Japanese diatomists. (2006)
  • Author(s): Tuji, A., Tanimura, Y.
  • Journal Title: Proceedings of the 18th International Diatom Symposium, Miedzzdroje, Poland. (in press)
• [Journal Article] An exceptionally well preserved middle Pleistocene epiphytic diatom, Arachnoidiscus ornatus, from Japan : A possible taphonomic process. (2005)
  • Author(s): Tanimura, Y., Kato, M., Nagumo, T., Kobayashi, A., & Yokoyama, K.
  • Journal Title: Bull. Natn. Sci. Mus., Tokyo, Ser. C 31 Pages: 7-12
  • NAID: 110006141352
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Ail exceptionally well preserved middle Pleistocene epiphytic diatom, Arachnoidiscus ornalus, from Japan : Apossible taphonomic process. (2005)
  • Author(s): Tanimura, Y., Kato, M., Nagumo, T, Kobayashi, A., Yokoyama, K.
  • Journal Title: Bull. Natun. Sci. Mus., Tokyo, Sen. C 31 Pages: 7-12
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] An exceptionally well preserved middle Pleistocene epiphytic diatom, Arachnoidiscus ornatus, from Japan : A possible taphonomic process. (2005)
  • Author(s): Tanimura, Y., Kato, M., Nagumo, T., Kobayashi, A., Yokoyama, K.
  • Journal Title: Bull.Natn.Sci.Mus., Tokyo, Ser.C 31 Pages: 7-12
  • NAID: 110006141352
• [Journal Article] Calcareous dinoflagellates from a northwestern Pacific sediment trap and their paleoceanographic implications. (2004)
  • Author(s): Tanimura Y. & Shimada C.
  • Journal Title: Micropaleontology 50(4) Pages: 343-356
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] A new variety of Cyclotella atomus from Tokyo Bay, Japan ; C. atomus var. marina var. nov. (2004)
  • Author(s): Tanimura Y., Nagumo, T. & Kato, M.
  • Journal Title: Bull. Natun. Sci. Mus., Tokyo, Ser. C 30 Pages: 5-11
  • NAID: 110004707983
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Calcareous dinoflagellates from a northwestern Pacific sediment trap and their paleoceanographic implications. Tanimura (2004)
  • Author(s): Tanimura Y., Shimada C
  • Journal Title: Micropaleontology 50 (4) Pages: 343-356
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] A new variety of CycloteUa atomus from Tokyo Bay, Japan; C. atomus var. marina van nov (2004)
  • Author(s): Y., Nagumo, T., Kato, M
  • Journal Title: Bull. Natun. Sci. Mus., Tokyo, Sen. C 30 Pages: 5-11
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Calcareous dinoflagellates from a northwestern Pacific sediment trap and their pleoceanographic implications (2004)
  • Author(s): Tanimura, Y., Shimada, C.
  • Journal Title: Micropaleontology 50,4 Pages: 343-356
• [Journal Article] A new variety of Cyclotella atomus from Tokyo Bay, Japan ; C.atomus var.marina var.nov (2004)
  • Author(s): Tanimura Y., Nagumo, t., Kato, M.
  • Journal Title: Bull.Natun.Sci.Mus.,Tokyo, Ser.C 30 Pages: 5-11
• [Journal Article] 室戸沖南海トラフ陸側斜面の土佐ばえ海盆より得られた完新世地震性タービダイト・KR9705P1の例 (2004)
  • Author(s): 岩井雅夫, 藤原治, 門馬大和, 岩崎望, 鹿納晴尚, 尾田太良, 松岡裕美, 岡村眞
  • Journal Title: 地質学論集 58 Pages: 137-152
• [Journal Article] Seasonal variation in skeletal silicification of Neodenticula seminae, a marine planktonicdiatom : Evidence based on sediment trap experiments in the northwestern Pacific Ocean'1997-2001
  • Author(s): Shimada, C, Tanaka, Y., Tanimura, Y.
  • Journal Title: Marine Micropaleontology (in press)
  • Description: 「研究成果報告書概要(欧文)」より