Analysis on the effect of Global Warming for aquaculture ponds at different Altitudes using Environmental Genomics

2016 Fiscal Year Final Research Report

• Project/Area Number: 25303021
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 海外学術
• Research Field: Civil and environmental engineering
• Research Institution: Nagasaki University
• Principal Investigator: ITAYAMA Tomoaki 長崎大学, 工学研究科, 教授 (80353530)
• Co-Investigator(Kenkyū-buntansha): 岩見 徳雄 明星大学, 理工学部, 准教授 (00353532) ; 杉浦 則夫 筑波大学, 国際室, 特命教授 (10302374) ; 間世田 英明 徳島大学, ソシオテクノサイエンス研究部, 准教授 (10372343) ; 清水 和哉 東洋大学, 生命科学部, 講師 (10581613) ; 岡野 邦宏 秋田県立大学, 生物資源科学部, 助教 (30455927) ; 田口 浩一 長崎大学, 工学研究科, 教授 (00625345)
• Research Collaborator: Niwooti Whangchai メジョー大学, 准教授 ; Ruenkeaw Praphrute メジョー大学, 技術職員 ; Korntip Kannika パヤオ大学, 助教 ; Rattapoom Prommana パヤオ大学, 准教授 ; Redel Gutierrez セントラルルゾン大学, 准教授 ; Louis Lebel チェンマイ大学, 研究ディレクター ; Khomsan Ruangrit チェンマイ大学, 研究員
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 有毒藍藻 / 藍藻毒 / ミクロシスティン / 地球温暖化 / 養魚池 / 統計モデル

Outline of Final Research Achievements

We surveyed aquaculture ponds at different altitudes in order to evaluate the effect of global warming for proliferation of toxic cyanobacteria. Water temperature, nutrients, chlorophyll-a (phytoplankton surrogate), cyano-toxin microcystin were measured. Phycocyanin-ITS gene (total cyanobacteria surrogate), microcystin synthesis gene mcyB (toxic cyanobacteria with producing microcystin surrogate) were quantified by real-time PCR. We analyzed the obtained data by statistical model. The results clearly showed the following facts. The increment of water temperature and the increase of both N and P loading enhanced the growth of phytoplankton. Increment of water temperature and increase of nutrients N loading enhanced the growth of the total cyanobacteria and the toxic cyanobacteria. However, we found new fact that the standing crops of cyano-toxin microcystin was suppressed by the increment of water temperature, though the increase of nutrients N loading added to microcystin.

Free Research Field

土木環境