Understanding of marine food chain in the anoxic and dysoxic water

• 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
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 食物連鎖 / 海洋 / 貧酸素水塊 / 海洋生態

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.

Research Products

• [Journal Article] Phytoplankton as a principal diet for callianassid shrimp larvae in coastal waters, estimated from laboratory rearing and stable isotope analysis (2018)
  • Author(s): Umezawa Y、Tamaki A、Suzuki T、Takeuchi S、Yoshimizu C、Tayasu I
  • Journal Title: Marine Ecology Progress Series Volume: 592 Pages: 141-158
  • DOI: 10.3354/meps12507
  • NAID: 120006988455
  • Peer Reviewed / Open Access
• [Presentation] 長崎周辺海域に出現するカイアシ類ノープリウス幼生の遊泳行動 (2017)
  • Author(s): 末次淳一・中脇陽光・鈴木利一
  • Organizer: 日本海洋学会 2017年度秋季大会
• [Presentation] Motion of appendages during swimming and feeding in zoeae of the ghost shrimp, Nihonotrypaea harmandi (2017)
  • Author(s): Rei Somiya, Toshikazu Suzuki, Akio Tamaki
  • Organizer: The Third Asian Marine Biology Symposium
  • Int'l Joint Research
• [Presentation] ハルマンスナモグリゾエア幼生の遊泳と摂餌に関わる各付属肢の動き (2017)
  • Author(s): 宗宮麗・鈴木利一・玉置昭夫
  • Organizer: 2017年日本プランクトン学会・ベントス学会合同大会
• [Presentation] Feel good in hypozia? - From microbes to whales, diverse life forms subsist on the “dead zone” in an enclosed bay (Omura Bay, Nagasaki) - (2017)
  • Author(s): Minoru Wada, Ryuji Kondo, Yu Umezawa, Motohiro Shimanaga, Dongsung Kim, Toshikazu Suzuki, Yuuki Kawabata, Yoshiki Matsushita, Atsushi Ishimatsu, Takashi Aoshima, Hiroyuki Takasu, Takuro Nakahara, Masao Amano
  • Organizer: The JSFS 85th Anniversary-Commemorative International Symposium “Fisheries Studies for Future Generations”
  • Int'l Joint Research
• [Presentation] 五島灘から有明海における動植物プランクトンの出現状況 (2016)
  • Author(s): 荒川佑一・大貫友祥・金原好美・鈴木利一
  • Organizer: 日本海洋学会2016年度秋季大会
  • Place of Presentation: 鹿児島大学(鹿児島県鹿児島市）
  • Year and Date: 2016-09-11