2015年度日本海洋学会春季大会ナイトセッション報告 「南極海におけるSea Ice Biota 研究の進展を目指して」

2015年度日本海洋学会春季大会開催期間中の2015年3月24日，東京海洋大学において，ナイトセッション「南極海におけるSea Ice Biota 研究の進展を目指して」が開催された．本ナイトセッションでは，海氷の生成と融解のプロセスなどの海洋物理学的情報と定着氷域や浮氷域における海氷中の生物に関する情報を持ち寄り，南極海の生態系における海氷中生物群集の潜在的な生理・生態学的意義から，定着氷域と浮氷域の生物群集の関係，海氷履歴の推定や気候変動の研究の指標生物としての海氷中生物の利用の可能性まで議論を展開し，それに基づき今後の研究の方向性や発展性について意見交換した．なお，参加者は28名であった．The workshop "Progress in Research into Sea Ice Biota of the Antarctic Ocean" was held on 24 March 2015 at Tokyo University of Marine Science and Technology (TUMSAT) as a night session under the joint sponsorship of the Oceanographic Society of Japan. The aim of the workshop was to share information regarding the physical processes of ice formation and melting, and the organisms associated with sea ice, and to discuss the ecological significance of sea ice biota. Five presentations were delivered on various topics related to Antarctic sea ice. The potential importance of sea ice biota in the Antarctic marine ecosystem was emphasized throughout the workshop. Also discussed was a future feasibility study of sea ice biota as biological indicators of the physical processes of sea ice formation. A total of 28 scientists and students attended the session

Vertical distribution patterns of pelagic cnidarians in the oceanic zone off Adélie Land, East Antarctica

第3回極域科学シンポジウム/第34回極域生物シンポジウム 11月26日（月） 国立極地研究所 ３階ラウン

氷縁に出現する微細藻類群集

第6回極域科学シンポジウム[OB] 極域生物圏11月16日（月）　国立極地研究所１階交流アトリウ

The variability of small animal assemblage within drifting pack ice in the marginal ice zone of the Antarctic Ocean

第6回極域科学シンポジウム[OB] 極域生物圏11月16日（月）　国立極地研究所１階交流アトリウ

Temporal variation of particulate organic carbon flux at the mouth of Tokyo Bay

A sediment trap experiment was conducted at a depth of 750 m at the mouth of Tokyo Bay to clarify the quantity and transport process of particles from the bay to the open ocean. The high total mass flux (8.7 ± 4.5 g m(–2) d(–1)) suggests that the particles not only originate in the surface layer right above the trap, but are also focused in Uraga Channel and discharged into the bay mouth. The organic carbon and nitrogen isotope ratios (δ(13)C(org), δ(15)N) of the trapped particles were like those of the surface sediment in the bay, that is, a mixture of particles in rivers and suspended particles in the surface layer of the bay. Compared with the results of the experiment conducted in 1995–2002, the average total mass flux was reduced by 70% and organic carbon content was reduced by 50%. The δ(13)C(org) values of trapped particles were also lower than those observed in the previous experiment, indicating a lower contribution from surface-suspended particles with high δ(13)C(org) values in the bay. These results could partly reflect a decrease of the concentration of the suspended particulate carbon in the bay by half over 20 years. Another factor contributing to the decrease of the flux at the bay mouth would be that the intrusion of Kuroshio coastal water into the bay, which pushes particles out to the bay mouth, has not occurred in recent years

Report of the night session "Progress in Research into Sea Ice Biota of the Antarctic Ocean" presented at the Spring Meeting of the Oceanographic Society of Japan, 2015

The workshop "Progress in Research into Sea Ice Biota of the Antarctic Ocean" was held on 24 March 2015 at Tokyo University of Marine Science and Technology (TUMSAT) as a night session under the joint sponsorship of the Oceanographic Society of Japan. The aim of the workshop was to share information regarding the physical processes of ice formation and melting, and the organisms associated with sea ice, and to discuss the ecological significance of sea ice biota. Five presentations were delivered on various topics related to Antarctic sea ice. The potential importance of sea ice biota in the Antarctic marine ecosystem was emphasized throughout the workshop. Also discussed was a future feasibility study of sea ice biota as biological indicators of the physical processes of sea ice formation. A total of 28 scientists and students attended the session