The establishment of picocyanobacteria strains for the purpose of the water quality maintenance of Lakes Shinji and Nakaumi and applied study

2014 Fiscal Year Final Research Report

• Project/Area Number: 24510032
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental impact assessment/Environmental policy
• Research Institution: Shimane University
• Principal Investigator: OHTANI Shuji 島根大学, 教育学部, 教授 (50185295)
• Research Collaborator: SHIMURA Yohei 国立環境研究所 ; KAWACHI Masanobu 国立環境研究所 ; KASAI Akihide 京都大学フィールド科学教育研究センター ; NOJIRI Yukari 島根県保健環境科学研究所 ; SATO Sachiko 島根県保健環境科学研究所 ; KAMIYA Hiroshi 島根県保健環境科学研究所 ; TSUCHIE Mayo 島根県水産技術センター ; FUKUI Katsuya 島根県水産技術センター ; SEMURA Hitoshi 島根県水産技術センター ; ISHIBASHI Keiko 島根大学, 教育学部 ; TAKAHASHI Yoshiyuki 島根大学, 生物資源科学研究科 ; SATO Toshio 島根大学, 生物資源科学研究科 ; TANI Yukinori 静岡県立大学, 環境科学研究所 ; NANRI Takahiro 東京大学, 大学院新領域創成科学研究科
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 汽水湖 / 宍道湖・中海 / 植物プランクトン / ピコシアノバクテリア / 培養株 / 大量培養 / ヤマトシジミの餌 / 水質保全

Outline of Final Research Achievements

In the brackish Lakes Shinji and Nakaumi, picocyanobacteria (cells ca. 1 μm in diameter) have been frequently dominant, but species were not confirmed and the roles in the ecosystem were not known. Pycocyanobacteria strains (ESS-1-2 and S3-1) were identified as Cyanobium sp. by the observation of cell morphology and the molecular analysis. Culture conditions of ESS-1-2 and several phytoplankton of Lake Shinji were established for the feeding experiment of Corbicula japonica. We observed a process of the digestion from feces and gastrointestinal observations of Corbicula japonica with ESS-1-2. After checking the effectiveness as the bait of Corbicula japonica with ESS-1-2, a diatom and a green alga, a diatom was the most effective as bait.

Free Research Field

微細藻類の分類学