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A comparative study of materials flows between seagrss-and seaweed-based ecosystemes in tropical lagoon.

Research Project

Project/Area Number 06041028
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research InstitutionUniversity of tokyo

Principal Investigator

KOIKE Isao  Ocean Research Institute, University of Tokyo, Professor, 海洋研究所, 教授 (30107453)

Co-Investigator(Kenkyū-buntansha) KOMATSU Teruhisa  ORI.Univ.of Tokyo, Research Associate, 海洋研究所, 助手 (60215390)
POLLARD P.C  Department of Chemical Engineering and Microbiology, The Univ.of Queensland, 研究員
YAMAMURO Masumi  Department of Marime Geology, Geological Survey of Japan, 地質調査所, 研究官
SUZUKI Takao  Faculty of Science, Tohoku Univ.Research Associate, 理学部, 助手 (10124588)
MINAGAWA Masao  Hokkaido Univ.Associate Professor, 地球環境科学, 助教授 (10250507)
KUNII Hidenobu  Fuculty of Science, Shimane Univ.Associate Professor, 汽水域研究センター, 助教授 (70161651)
AIOI Keiko  ORI.Univ.of Tokyo, Research Associate, 海洋研究所, 助手 (90107459)
KOGURE Kazuhiro  ORI.Univ.of Tokyo, Associate Professor, 海洋研究所, 助教授 (10161895)
IIZUMI Hitoshi  Hokkaido National Fisheries Institute, Section Head, 北海道区水産研究所, 室長 (00159550)
NOJIMA Satoshi  Faculty of Science, Kyushu Univ.Associate Professor, 理学部, 助教授 (30112288)
MUKAI Hiroshi  Faculty of Science, Hokkaido Univ.Professor, 理学部, 教授 (00013590)
NISHIHIRA Moritaka  Faculty of Science, Tohoku Univ.Professor, 理学部, 教授 (80004357)
POLLARD P.  Department of Chemical Engineering and m, 研究員
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥17,000,000 (Direct Cost: ¥17,000,000)
Fiscal Year 1996: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1995: ¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1994: ¥7,700,000 (Direct Cost: ¥7,700,000)
KeywordsHalimeda / tropical lagoon / symbiotic system / seagrass / herbivores fish / nitrogen fixation / nutrients / nitrogen cycle / stable isotope / 熱帯藻場 / 海藻生態系 / 熱帯礁湖 / 海草藻場 / 海藻藻場 / 生元素循環 / 底性生物 / 底性藍藻 / 堆積物 / デトリタス食物連鎖
Research Abstract

The Purpose of this study is to evaluate the cycling of carbon and nitrogen and their coupling with the metabolisms of biological communities in seagrass beds and in seaweeds in tropical lagoon. We made an extensive field observation in the tropical lagoon located at south of Suva, Fiji from 1994-1996. In the lagoon, there is a dense Syringodium seagress bed and also Halimeda population around the seagrass bed. Following are the some outcomes from the field survey.
(1) Combing with the available data of aero-photographs and our field observation, the seagrass bed near the Dravuni Island expanded their size to about 6 times during the last 20 years. This increase in size was also confirmed for the latest 3 years field observation, indicating 22m expansion of seagrass bed to the shore side. The island has a population of some 100 peoples, which is rather stable during the last 20 years. But, the village equipped water supply system from the well about 5-6 years ago. Possible reason for th … More e seagrass increase is the change of nutrients load from the island due to the increase of water usage.
(2) Together with the change of seagrass bed, we found the change of epibenthic community distribution such as Ascidians and Lagenophyra. Some of those animals harbor symbiotic alage, which are significant primary producers in the tropical lagoon. The symbiotic character of those animals seems to be important factor controlling the small scale distribution with in seagrass bed and Halimeda communities.
(3) Stable isotope analyzes of 15-N and 13-C in various biological communities and suspended organic materials in the seagrass bed and its vicinity gave some interesting insight of food web structure in this ecosystem. Using the significant difference in both 13-C and 15-N rations in seagrass and their epiphytic algae, which are partially due to the nitrogen fixation by blue green algae, filamentous algae was suggested as a primary food source of epibenthic and other benthic animals. Active nitrogen fixation by filamentous blue green was also confirmed experimentally using C2H2 method. Less

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Isao Koike: "Nutritional diversity of symbiotic ascidians in a Fijian seagrass meadow." Ecological Research. 11. 381-386 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hiroshi Mukai: "Grazing effects of a Gammaridean Amphipoda, Ampithoe sp., on the seagrass, Syringodium isoetifolium, and epiphytes in a tropical seagrass bed in Fiji." Ecological Research. 10. 1-16 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Satoshi Nojima: "The rate and fate of production of seagrass debris in cages over a Syrigodium isoetifolium meadow, in Fiji." Seagrass Biology : Proceedings of an International Workshop. 1. 149-154 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masumi Yamamuro: "Rapid direct determination of organic carbon and nitrogen in carbonate bearing sediments using Yanaco-MT-5 CHN analyzer" Limnology and Oceanography. 40. 1000-1005 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masumi Yamamuro: "Carbon and nitrogen stable isotopes of primary producers in coral reef ecosystems" Limnology and Oceanography. 40. 617-621 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Isao Koike: "Fine scale distribution of nitrous oxide in marine sediments" Marine Chemistry. 52. 185-193 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Isao Koike: "Nutritional diversity of symbiotic ascidians in a Fijian seagrass meadow" Ecological Research. 11. 381-386 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Hiroshi Mukai: "Grazing effects of Gamaridean Amphipoda,Ampithoe sp.,on the seagrass,Syringodium isoetifolium and epiphytes in a tropical seagrass bed in Fiji" Ecological Research. 10. 1-16 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Satoshi Nojima: "The rate and fate of production of seagrass debris in cages over a Syringodium isoetifolium meadow,in Fiji" Seagrass Biology : Proceedings of an international workshop. 1. 149-154 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Masumi Yamamuro: "Rapid direct determination of organic carbon and nitrogen in carbonate bearing sediments using Yanaco MT-5 CHN analyzer" Limnology and Oceanography. 40. 1000-1005 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Masunti Yamamuro: "Carbon and introgen isotopes of primary producers in coral reef exosystems" Limnology and Oceanography. 40. 617-621 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Isao Koike: "Fine scale distribution of nitrous oxide in marine sediments" Marine Chemistry. 52. 185-193 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Koike, I. and K. Terauchi: "File scale distribution of nitrous oxide in marine sediments" Marine Chemistry. (in press).

    • Related Report
      1995 Annual Research Report
  • [Publications] Koike, I., and T. Suzuki: "Nutritional diversity of symbiotic ascidians in a Fijian seagrass meadow" Ecological Rsesearch. (accepted).

    • Related Report
      1995 Annual Research Report
  • [Publications] Aioi, K. AND T. Komatsu, K. Morita: "Giant seagrass, Zostera caulescens Miki, discovered uin Funakoshi Bay, Iwate Pref." Bull. Jap. Soc. Fish. Ocean.60(in press).

    • Related Report
      1995 Annual Research Report
  • [Publications] Mukai, H. Iijima: "Grazing effects of a Gammaridean Amphipoda, Ampithoe on the seagrass,Syringodium isoetifolium, and epiphytes in a tropical seagrass bed in Fiji" Ecological Research. 10. 1-16 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Aioi, K. and T. Komatsu: "A preliminary report on the recovery process of Zostera marina in Otsuchi Bay, northern Japan" Proc. International Seagrass Biology Workshop, Rottnest Island, Western Australia. 1-4 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Nishimura, M., K. Kogure, K. Tsukamoto, and K. Ohwada: "Detection and direct count of specific bacteria in natural seawater using 16SrRNA oligonucleotide probe" Bull. Jap. Soc. Microb. Ecol.10. 73-79 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Isao Koike & Takao Suzuki: "Nutritional diversity of symbiotic ascidians in a Fijian seagrass meadow" Ecological Research. (submitted).

    • Related Report
      1994 Annual Research Report
  • [Publications] Hiroshi Mukai & Akiko Iijima: "Grazing effect of a gammaridian amphipoda,Ampithoe sp.,on the seagrass bed in Fiji" Ecological Reseach. (submitted).

    • Related Report
      1994 Annual Research Report
  • [Publications] P.C.Pollard & Kazuhiro Kogure: "The role of epihytic and epibenthic algal productivity in a tropical seagrass community." Australian Journal of Marine and Freshwater Research. 44. 141-154 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] Masumi Yamamuro,Isao Koike & Hitoshi Iizumi: "Partitioning of the nitrogen stock in the vicinity of a Fijian seagrass bed dominated by Syringodium isoetifolium Dandy." Australian Journal of Marine and Freshwater Research. 44. 101-115 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] Moritaka Nishihira & Takao Suzuki: "Abundance,Population structure and microhabitat use of the compound ascidians in a Fijian seagrass bed." Ecological Research. (in preparation).

    • Related Report
      1994 Annual Research Report
  • [Publications] Satoshi Nojima: "Grazing effect of Caltomus spinidens on defoliation of the seagrass,Syringodium isoetifolium,in a Fijian seagrass bed." Ecological Research. (in preparation).

    • Related Report
      1994 Annual Research Report
  • [Publications] Isao Koike(ed.): "Developmental processes and material flow in tropical seagrass beds" 144 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] P.C.Pollard et al.(eds.): "Tropical Seagrass Ecosystems; Structure and Dynamics in the Indo-West Pacific." CSIRO Australia, 233 (1993)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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