Phytoplankton changes effected by anxious water of enclosed

2011 Fiscal Year Final Research Report

• Project/Area Number: 21340153
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: Nagasaki University
• Principal Investigator: MATSUOKA Kazumi 長崎大学, 大学院・水産・環境科学総合研究科, 教授 (00047416)
• Co-Investigator(Kenkyū-buntansha): NAKATA Hideaki 長崎大学, 大学院・水産・環境科学総合研究科, 教授 (60114584) ; YAMAGUCHI Hitoshi 長崎大学, 大学院・工学研究科, 准教授 (10359143) ; UMEZAWA Yu 長崎大学, 大学院・水産・環境科学総合研究科, 助教 (50442538) ; WADA Minoru 長崎大学, 大学院・水産・環境科学総合研究科, 准教授 (70292860)
• Project Period (FY): 2009 – 2011
• Keywords: 貧酸素水塊 / 栄養塩溶出 / 植物プランクトン / 大村湾 / メソコスム

Research Abstract

In order to understand a relation between phytoplankton floral change and nutrient supply, investigations of formation of anoxic environments, mechanisms of nutrient supply, and distribution of nutrients were carried out in Omura Bay, West Kyushu, Japan. Results were follows ; intrusion of dense seawater forms stratification at the center basin, and then anoxic water is produced by microbial respiration. Under anoxic environments, NH_4 and PO_4 are selectively dissolved from organic-enriched bottom sediments. In a mesocosm experiment where we produced an anoxic condition artificially, a floral change from diatoms to dinoflagellates occurred after selective regeneration of NH^+_4 and PO^<3->_4. Historical change of dinoflagellate cysts recorded in core sediment of Omura Bay suggests that eutrophication reflected by increase of heterotrophic dinoflagellate cysts appeared around 1970s.

Research Products

• [Journal Article] 渦鞭毛藻シストは富栄養化指標として有効か (2011)
  • Author(s): 松岡數充
  • Journal Title: 日本プランクトン学会誌 Volume: no.58 Pages: 55-59
• [Journal Article] Estimation of Abundance and Diversity of Bacteria associating with Burrow Lining of Capitella sp. I in Seawater Soft-Agar Microcosm (2010)
  • Author(s): Wada, M, Dan, Z, Do H-K, Nomura, H, Kunihiro, T, Nishimura, M, Koture, K, Ohwada, K, Tsutsumi, K
  • Journal Title: In Coastal Environmental and Ecosystem Issues of the East China Sea, Nagasaki University Major Research Project"Restoration of Marine Environment and Resources in East Asia Pages: 165-172
• [Journal Article] Reconstruction of historical nutrient levels in Korean and Japanese coastal areas based on dinoflagellate cyst assemblages (2010)
  • Author(s): Shin, H-H, Mizushima, K., Seok Jin Oh, S-J., Park, J-S., Noh, I-H, Iwataki, M., Matsuoka, K., Yoon, Y-H
  • Journal Title: Marine Pollution Bulletin Volume: vol.60 Pages: 1243-1258
• [Journal Article] Microbial community respiration and structure of dead zone sediments of Omura Bay
  • Author(s): Wada, M, Suzuki, S, Nara, T, Umezawa, Y, Shimanaga, M., Matsuoka, M, Nakata, H
  • Journal Title: Japan. Journal of Oceanography Volume: (in press)
• [Journal Article] Phylogenetic subdivision of the genus Protoperidinium,(Peridiniales, Dinophyceae) with special emphasis of the Monovela Group
  • Author(s): Matsuoka, K, Kawami, H
  • Journal Title: J. Micropaleontol(Dino9 volume) Volume: (in press)
• [Presentation] 2011 Microbial community respiration and structure of dead zone sediments of Omura Bay, Japan (2011)
  • Author(s): Wada, M., Suzuki, S., Nara, T., Matsuoka, K., Nakata, H.
  • Organizer: 8^<th> International workshop on the Oceanography and Fisheries Science of the East China Sea
  • Place of Presentation: Naha, Okinawa, Japan
  • Year and Date: 20111124-25
• [Presentation] New findings of the unsolved cyst-theca relationship of the Protoperidinium oblongum-complex (2011)
  • Author(s): Sarai, C. and Matsuoka, K
  • Organizer: International Workshop ; THINKING BIG ABOUT THINGS SMALL : HOW TO LINK PACIFIC TO ATLANTIC DINOFLAGELLATES? p. 17, Nagasaki, 21^<th>-23^<rd>
  • Place of Presentation: Nagasaki, Japan
  • Year and Date: 20110501-22
• [Presentation] (2011)大村湾における栄養塩溶出の時空間的変動の解明 (2011)
  • Author(s): 牟田直樹・松岡數充・梅澤有
  • Organizer: 2011年度日本海洋学会秋季大会(ポスター)
  • Place of Presentation: 福岡市
  • Year and Date: 2011-09-28
• [Presentation] (2011)長崎県大村湾におけるメソコスム実験からみた植物プランクトン群集の変化 (2011)
  • Author(s): 日野出賢二郎・山口仁士・梅澤有・和田実・松岡數充
  • Organizer: 2011年日本ベントス学会・日本プランクトン学会大会(ポスター)
  • Place of Presentation: 高知市
  • Year and Date: 2011-09-18
• [Presentation] (2010)西九州大村湾でのセディメントトラップ実験による渦鞭毛藻シスト形成時期の環境 (2010)
  • Author(s): 仲田希望・松岡數充
  • Organizer: 2010年度日本プランクトン学会・日本ベントス学会合同大会(口頭)
  • Place of Presentation: 柏市'千葉
  • Year and Date: 2010-10-08
• [Presentation] (2009)夏季の大村湾における風の変動特性-湾奥部の青潮発生との関連- (2009)
  • Author(s): 遠山祐一・中田英昭・高橋鉄哉
  • Organizer: 2009年度水産海洋学会研究発表大会講演要旨集(口頭)
  • Place of Presentation: 長崎市
  • Year and Date: 2009-11-18