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1995 Fiscal Year Final Research Report Summary

Feeding of zoopalnkton and micronekton in the deepsea ecosystem

Research Project

Project/Area Number 06839008
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 海洋生物学
Research InstitutionOCEAN RESEACH INSTITUTE,UNIVERSITY OF TOYOKYO

Principal Investigator

TERAZAKI Makoto  Ocean Res.Inst., Univ.of Tokyo, Professor, 海洋研究所, 教授 (20111586)

Co-Investigator(Kenkyū-buntansha) KIKUCHI Tomohiko  Department of Education, Yokohana National Univ., Associate Professor, 教育学部, 助教授 (60214756)
NISHIDA Shuhei  Ocean Res.Inst., Univ.of Tokyo, Research Associate, 海洋研究所, 助手 (70134658)
KAWAGUCHI Kouichi  Ocean Res.Inst., Univ.of Tokyo, Professor, 海洋研究所, 教授 (40013586)
Project Period (FY) 1994 – 1995
Keywordsdeep-sea / ecology / benthopelagic / zooplankton / micronekton / feeding / SI / Sagami Bay
Research Abstract

1) Collections were made of deep sea benthopelagic organisms in the Sagami Bay, Japan using a newly-develope multiple plankton sampler (DTMPS) attacged to the deep tow system. Tows were made as close to the sea floor as the terrain would allow, maintaining a distance of 0.5-3.0m above the bottom. Benthopelagic organisms were effectively collected by this sampler enough to estimate their biomass. Benthopelagic biomass, including megaplankton (> 2cm), ranged from 4.0-43.3g/1000m^3 and excluding megaplankton 4.0-22.6g/1000m^3. Biomass decreased exponentially with depth but showed a clearly different slope than that of pelagic biomass. Assuming that the benthopelagic biomass does not change substantially by area or season, the percentage of benthopelagic biomass to surface biomass ranged from about 5 to 30 %, with an average of 15 % in Sagami Bay.
2) The delta^<15>N valus of micronekton collected from Sagami Bay ranges from 9.4 to 14.2 @91. The ^<15>N values of the micronekton. Gonostoma gracile, increased with growth (9.4 to 12.6 @91) and it seems that males, before sex reversal, and females cinsume different food organisms.
3) The C/N ratio of meso- and bathypelgic copepods which did not the vertical migration, is almost constant at any season and area. But this ratio of Neocalnus cristatus which was shown remarkable ontogenetic migration, decreased with depth. Many fragments of phytoplankton which were caused by fecal pellet, were recognized under SEM observation.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Terazaki M. et al.: "^<15>N abundance in micronekton in Sagami Bay, Central Japan." Journal of Plankton Research. 16. 1589-1593 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Terazaki M. et al.: "Horizontal distribution and seasonal variability of the epipelagic chaetognath Sagitta elegans in relation to hydrography in the western subarctic Pacific Ocean." Fisheries Oceanography. 4. 158-170 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nishida S., Takahashi Y. and Kittaka J.: "Structure changes in the hepatopancreas of the rock lobster, Jasus edwardsii (Crustacea: Palinuridae) during development from the puerulus to post-puerulus." Marine Biology. 123. 837-844 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kobayashi H. and Terazaki M.: "Distribution of Diacavilina off Coast of Japan" Chiribotan. 25. 92-96 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Terazaki M.: "Vertical distribution of pelagic chaetognaths and feeding of Sagitta elegans in the Central Equatorial Pacific." Journal of Plankton Research. 18(in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Terazaki, M.et al: "^<15>N abundance in micronekton in Sagami Bay, Central Japan" J.Plankton Res. 16. 1589-1593 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Terazaki, M.et al: "Horizontal distribution and seasonal variability of the epipelagic chaetognath Sagitta elegans in relation to hydrography in the western subarctic Pacific Ocean." Fish.Oceanogr. 4. 158-170 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishida, S,Takahashi, Y.and Kittaka J: "Structure changes in the hepatopancreas of the rock lobster, Jasus edwardsii (Crustacea : Palinuridae) during development from the puerulus to post-puerulus" Mar.Biol. 123. 837-844 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kobayashi, H.and Terazaki, M: "Distribution of Diacavilina off Coast of Japan" Chiribotan. 25. 92-96 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Terazaki, M: "Vertical distribution of pelagic chaetognaths and feeding of Sagitta enflata in the Central Equatorial Pacific" J.Plankton Res. 18, (in press). (1996)

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

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Published: 1997-03-04  

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