Study on the relation between iron concentration and red tide microorganism proliferation in the Ariake Sea (Saga prefectural sea area)

2014 Fiscal Year Final Research Report

• Project/Area Number: 24510016
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Prefectural University of Hiroshima
• Principal Investigator: NISHIMOTO Jun 県立広島大学, 生命環境学部, 准教授 (80253582)
• Co-Investigator(Kenkyū-buntansha): MATSUBARA Tadashi 佐賀県有明水産振興センター, その他の部署, その他 (30601611) ; TABATA Masaaki 佐賀大学, 大学院工学系研究科, 研究員 (40039285)
• Research Collaborator: WATANUKI Gakuto ; KOGA Masaki
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 鉄 / 珪藻類 / 窒素 / リン / ケイ素 / シンクロトロン / 硫黄

Outline of Final Research Achievements

The frequency of red tide is increasing in the Ariake Sea recently. The supply of a lot of DIN and/or DIP from land to the sea is being thought to cause the red-tide outbreak. However, we suspected the influence of iron on red tide microorganism proliferation; the purpose of this study is to investigate the relation between the dissolved iron concentration and the proliferation. The respective averages of the number of diatoms in 1 ml and the dissolved iron concentration in surface seawater in summer were 9667 cell/ml and 3.2 ppb in 2012, 3830 cell/ml and 1.2 ppb in 2013, and 1778 cell/ml and 0.7 ppb in 2014. Diatoms were hard to proliferate when the concentration of iron fall. Further, the following tendency appeared in 2014; when the iron concentration increased, the number of diatoms decreased; when the concentration decreased, the number increased. We think the iron concentration is an important factor for the diatom red tide in the Ariake Sea.

Free Research Field

分析化学