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1996 Fiscal Year Final Research Report Summary

Taphonomic bias in the transition from life to death assemblages of marine phytoplanktor

Research Project

Project/Area Number 07640628
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionNational Science Museum

Principal Investigator

TANIMURA Yoshihiro  National Science Museum, Geology, Senior Curto, 地学研究部, 室長 (80141985)

Co-Investigator(Kenkyū-buntansha) SAITO Yasuji  National Science Museum, Geology, Chair, 地学研究部, 部長 (00000133)
Project Period (FY) 1995 – 1996
Keywordsplankton / sediment traps / taphonomic bias
Research Abstract

Four sets of a time-series of thirteen consecutive 27 to 28 days-long samples representing one sediment trapping interval (Mar. 5,1991-Mar. 2,1992) were collected from four deferent depths in the northwest Pacific at station JT (34゚9.802'N,141゚59.268'E ; 916m, 3422m, 5429m and 8430m), and provided material to evaluate information loss in the transition from life to death assemblages of diatoms. Two sediment samples also provided material to evaluate the loss on sediment-water interface. Comparison in flux records among the four sets of trap samples distinguishes one high flux period found in two different dephts as conspicuous flux peaks ; 3442m and 5429m. A sinking velocity of diatom flux is calculated from a time lag between the two peaks ; more than 71m/day. Differences in diatom assemblages among the two peaks and the underlying sediments suggest that dissolution on sediment-water interface appears to be the prime factor in determining diatom assemblages preserved in sediments, and the following three diatom groups are distinguished as most susceptible forms to value dissolution in the Kuroshio water ; Nitzschia bicapitata-bifulcata complex, Neodelphineis indica, Chaetoceros species. These forms together comprise 55% to 60% of total sediment-trap floras which suggests that information loss from water column to sediments is at least 50%.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Tanimura,Y.: "Fossil marine plicated Thalassiosira : Taxonomy and an idea on phylogeny." Diatom Research. 11. 165-202 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sato,H.& Tanimura,Y.: "A characteristic form of diatom Melosira as an indicator of maline limit during the Holocene Japan." 第四紀研究. 35. 99-107 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Akiba,F.,Tanimura,Y.Tsoy,I.B.& Hiramatu,C.: "Morphology of an extinct nonmarine diatom, Aulacoseira moisseevae n. sp. from Japan and two other related species with elliptic valves and their taxonomic implication." 14th International Diatom Symposium,Tokyo,Abstract. 1 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sekine,K.,Iijima,H.& Saito,Y.: "Jurassic radiolarians from the Manba unit of the morthern Chichibu belt,Kanto Mountains,central Japan." Bull. Natn. Sci. Mus.,Tokyo. 21. 1-10 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sekine,K.,Iijima,H.& Saito,Y.: "Early Jurassic radkiolarians from the Hashidate Group,Kanto Mountains,central Japan." Bull. Natn. Sci. Mus.,Tokyo. 21. 51-59 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tanimura, Y.: "Fossil marine plicated Thalassiosira : Taxonomy and an idea on phylogeny." Diatom Research. vol.11, co.1. 165-202 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sato, H.& Tanimura, Y.: "A characteristic form of diatom Melosira as an indicator of maline limit during the Holocene Japan." The Quaternary Res.vol.35, no.2. 99-107 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akiba, F., Tanimura, Y., Tsoy, I.B.& Hiramatu, C.: "Morphology of an extinct nonmarine diatom, Aulacoseira moisseevae n. sp. from Japan and two other related species with elliptic valves and their taxonomic implication." 14th International Diatom Symposium, Tokyo. (Abstract). 1 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sekine, K., Iijima, H.& Saito, Y.: "Jurassic radiolarians from the Manba unit of the morthern Chichibu belt, Kanto Mountains, sentral Japan." Bull. Natn. Sci. Mus., Tokyo. vol.21, nos1 & 2. 1-10 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sekine, K., Iijima, H.& Saito, Y.: "Early Jurassic radkiolarians from the Hashidate Group, Kanto Mountains, central Japan." Bull. Natn. Sci. Mus., Tokyo. vol.21, nos3 & 4. 51-59 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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