Understanding of marine food chain in the anoxic and dysoxic water

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K07530
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aquatic bioproduction science
• Research Institution: Nagasaki University
• Principal Investigator: SUZUKI Toshikazu 長崎大学, 水産・環境科学総合研究科(水産), 教授 (20284713)
• Research Collaborator: ARAKAWA Yuichi ; EKITOMI Yuka ; ONUKI Tomoyoshi ; OGURA Kazuma ; KANAHARA Konomi ; KAWABE Emiri ; KOBAYASHI Masaakira ; SUETSUGI Junichi ; TAKESHITA Hiroki ; NAKAWAKI Yoko ; MORIYA Daisuke
• Project Period (FY): 2015-10-21 – 2018-03-31
• Keywords: 食物連鎖 / 海洋 / 貧酸素水塊

Outline of Final Research Achievements

To understand marine plankton ecology under the dysoxic and anoxic conditions, standing crops and taxonomic composition of various plankton groups were investigated in Ariake Sea and Omura Bay, where dysoxic and anoxic conditions were routinely observed during summer. Abundance ratio of phytoplankton against net-zooplankton was larger in the inner part of Ariake Sea and its tendency was remarkable on July and August. Furthermore, planktonic ciliates occurred even in the anoxic water near the sea bottom and their biomass was comparable with that in the surface and middle layers, and larger-sized species occurred frequently in the anoxic water. When bacterial mat was formed on the bottom surface after prolonged anoxic/dysoxic condition, unicellular nanoplankton showed extremely higher abundance.

Free Research Field

浮游生物学