• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Studies on extinction mechanisms and ex-situ preservation of Charales in lakes

Research Project

Project/Area Number 09680561
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 環境保全
Research InstitutionNational Institute for Environmental Studies

Principal Investigator

WATANABE Makoto  Environmental Biology Division, National Institute for Environmental Studies, Director, 生物圏環境部, 部長 (10132870)

Co-Investigator(Kenkyū-buntansha) NOZAKI Hisayoshi  Graduate School of Science, University of Tokyo, Associate Professor, 大学院・理学系研究科, 助教授 (40250104)
NOHARA Seiichi  Environmental Biology Division, National Institute for Environmental Studies, Section Chief, 生物圏環境部, 室長 (60180767)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsCharales / Extinct species / species extinct in the wild / Endangered species / ex-situ preservation / イケダシャジクモ / 絶滅危惧I類種 / ハダシシャジクモ / キヌフラスコモ / Nitella gracilens / 卵胞子膜 / 最終枝 / Nitella furcata / 津軽十二湖 / 十三湖 / 野生絶滅種 / 湖沼
Research Abstract

The current status of the Charales in Japan was investigated based on field surveys of 40 lakes from 1997 to 1999 and compared with that of the same lakes reported by Kasaki (1964). No charalean species have been found in 28 lakes during the last 33 years. Such extinction seems to be caused by eutrophication of lakes, the artificial introduction of grass carps or the artificial fluctuation of water level for hydroelectricity. Although 31 charalean taxa have been recorded from these lakes by Kasaki (1964), now only 6 taxa, Chara braunii, C. globularis var. globularis, C. corallina, Nitella flexilis var. flexilis, and N. hyalina, were found. Even these six taxa have disappeared in more than 50% of lakes surveyed. So it was judged that these taxa were in endangered state. The five taxa of Charales, Chara globularis var. hakonensis, C. fibrosa var. brevibracteata, Nitella flexilis var. bifurcata, N. furcata var. fallosa, N. minispora, are extinct from the world charalean flora, because all of them are endemic to Japanese lakes. Nitellopsis obtusa was extinct from the Japanese lakes, but the plant originated from Lake Nojiri, Nagano Prefecture, Japan were this species once grew is now cultured in the Microbial Culture Collection, National Institute for Environmental Studies. The other 20 taxa of Charales were extinct from the lakes. Since it is not clear whether these taxa still exist in the other wetland areas, it was considered that these taxa were in endangered state. The four endangered species, Chara braunii, C. globularis var. globularis, Nitella flexilis var. flexilis and Nitella gracilens and the wild-extinct species, Nitellopsis obtusa were successfully cultured and the oospore of N. gracilens were observed.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 野崎久義、大森雄治、加崎英男、加藤〓重、金子謙一、佐野〓美、渡辺信: "日本の湖沼における車軸藻類の分布の現状調査と絶滅危惧種の系統保全"Research Report of Pyo Natura Fund. 13-17 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nozaki, h. , Kondo, M., Miyaji, K. Kato ,M., Watanabe, M M&Kuroiwa K: "Observation on the worphdogy and oospore wall ornamentation on in cultuve of the rediscovered Japanese endimic Nitella gracilens(chavales, chlonphyta)"Europian J. Phycology. 33. 357-359 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 渡辺信: "非難官束植物(菌類、地衣類、藻類、せん苔類)におけるレッドリストの回折"貴重野生動物種の考え方とその対応II. 43-47 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nozaki,H., Ohmori,Y., Katoh,M., Kasaki,H., Kaneko,K., Sano,S. and Watanabe,M.M.: "Distribution of Charales in Japanese lakes and culture collection of endangered charalean species"Research Report of Pro Natura Fund. 13-17 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nozaki,H., Kodo,M., Miyaji,K., Kato,M., Watanabe,M.M. and Kuroiwa,T.: "Observation on the morphology and oospore wall ornamentation in culture of the rediscovered Japanese endemic Nitella gracilens (Charales, Chlorophyta)"Europian Journal of Phycology. 33. 357-359 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Watanabe,M.M.: "Red lists of non-vascular plants (fungi, Lichen, algae and moss)"Rare species of wild animals and plants : its point of view and counterplans. 43-47 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Makoto M.Watanabe,S.Mayama,M.Hideki & H.Nozaki: "Biomass, species composition snol diversity of epipelie algae in mire pools"Hydrobiologia. 414(in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Nozaki,H., Kodo,M., Miyaji,K., Kato,M., Watanabe,M.M.& Kasaki,H.: "Observations on the morphology and oospore wall ornamentation in culture of the rediscovered Japanese endemic Nitella graciliens(Charales,Chlorophyla)" Eur.J.Phycol.33. 357-359 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 渡辺 信: "非維管束植物(菌類、地衣類、藻類、せん苔類)におけるレッドリストの解説" 貴重野生動植物種の考え方とその対応II. 43-47 (1997)

    • Related Report
      1997 Annual Research Report

URL: 

Published: 1997-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi