2001 Fiscal Year Final Research Report Summary
Selective consumption and taphonomy by benthic organisms at sediemnt-water interface --Establishment of new paleoceanographic prixies through experimental methods--
| Project/Area Number |
11440154
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Shizuoka University |
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Principal Investigator |
KITAZATO Hiroshi Institute of Geosciences, School of Science, Shizuoka University, Professor, 理学部, 教授 (00115445)
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| Co-Investigator(Kenkyū-buntansha) |
NAKATSUKA Takeshi Low Temperature Research Institute, Hokkaido University, associate Professor, 低温科学研究所, 助教授 (60242880)
SHIRAYAMA Yoshihisa Graduate School of Science, Kyoto University, Professor, 大学院・理学研究科, 教授 (60171055)
WADA Hideki Institute of Geosciences, School of Science, Shizuoka University, Professor, 理学部, 教授 (20126791)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Sediment-water interface / Sedimentary process / Consumption of organic matter / Meiobenthos / in situ culture experiments / Laboratory culture / Paleoceanography / Sagami Bay |
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| Research Abstract |
This research aims to trace consumption process of sinking organic matter by benthic orgamisms at Sediment-Water Interface (SWI) both through in situ and laboratory experiments. Field experiments were carried out both at Sagami Bay and Tanabe Bay. 1. Suspended organic matters in benthic nepheloid layer were collected by manned submersible. Organic conpositions were measured by gas chromatograph for identification. 2. Surface undisturbed sediments were collected with multiple corer. Core samples were sliced every 0.25 cm. Geochemical analyzes were made for characterizing chemical environments. Biomasses of meiobenthos were estimated according to faunal compositions. 3. In situ feeding experiments were carried out at Sagami Bay with manned submersible "Shinkai 2000". Single celled alga that were labelled with carbon 13 were supplied as food materials. 4. Both respiration rates and biomasses were measured at the laboratory. Remineralization rates of organic carbon by meiobenthos were calculated from intake rates, biomass and respiration rates.
Benthic organisms respond to sinking organic materials according to their own microhabitat preferences. For instance, shallow infaunal species respond rapidly and intake large ammount of organic matter. Numbers of benthic foraminifera changes in harmony to lipid contents within sediments, even though response differ from species to species. More than 50 % of sinking organic matters were consumed by benthic meiofauna. It is clear that benthic organisms play a large role at deep sea ecosystems around SWI.
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[Publications] Kitazto, H., Y. Shirayama, T. Nakatsuka, S. Fujiwara, M Shimanaga, Y. Kato, Y. Okada, J. Kanda, A. Yamaoka, T. Masuzawa, K. Suzuki: "Seasonal phytodetritus deposition and responses of bathyal benthic foraminiferal populations in Sagami Bay, Japan : -Preliminary results from "Project Sagami""Marine Micropaleontology. v. 40. 135-149 (2000)
Description
「研究成果報告書概要(欧文)」より
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