Distribution and population structure of two salps, Salpa thompsoni and Ihlea racovitzai off Lützow-Holm Bay in the Southern Ocean during austral summer

第2回極域科学シンポジウム/第33回極域生物シンポジウム 11月17日（木） 統計数理研究所 3階リフレッシュフロ

Relationship between chlorophyll specific productivity and temperature at the surface in Sagami Bay, Japan

Primary production was monthly measured from September 2001 to July 2003 at the surface in Sagami Bay, Japan. Thevariation in the primary production was primarily due to the variation in Pb (chlorophyll specific productivity). The values ofPb positively correlated with temperature. This may be due to relatively low contribution of diatoms in Sagami Bay

ウミタカマル ヲ モチイタ ナンキョク ケンキュウ ワークショップ 2008 ホウコク

「海鷹丸を用いた南極研究ワークショップ2008」を東京海洋大学品川キャンパスにおいて2008年8月8日に開催した.参加者は36名であった.2002/03年,2004/05年,2005/06年,2007/08年シーズンに行われた東京海洋大学「海鷹丸」の南極海研究航海(それぞれ,UM0203,UM0405,UM0506,UM0708航海)で得られた結果が報告された後,得られたデータやサンプルの管理及び成果取りまとめについて議論した.A workshop "Southern Ocean Study by RT/V (research and training vessel) Umitaka-Maru, 2008" was held on 8th August 2008 at the Shinagawa Campus of the Tokyo University of Marine Science and Technology (TUMSAT), with 36 participants. Results obtained during RT/V Umitaka-Maru (TUMSAT) cruises in austral summer of 2002/03 (UM0203), 2004/05 (UM0405), 2005/06 (UM0506), and 2007/08 (UM0708) and the current status of data were reported. Data management and synthesis of scientific results were discussed

トウキョウワンコウブ ニオケル クロロフィル α ノウド ト カイアシルイ コタイスウ ノ ヘンドウ ヨウイン

Chlorophyll a concentration and copepod abundance were measured in the entrance of Tokyo Bay in June, July, Septemberand November 2010. The chlorophyll a concentrations were more than 3 mg m^-3 in June and September within mixed layer.The chlorophyll a concentrations positively correlated with nitrate and nitrite, phosphate concentrations, which phytoplanktonbiomass is likely to be strongly affected by nutrient concentrations. In the 0-150m layer, mean abundance of copepods rangedfrom 39 to 421 inds. m^-3 and tended to increase from June to September. The abundance of copepods positively correlatedwith water temperature, whereas no significant correlation was found for the abundance of copepods and the chlorophyll aconcentrations. The abundance of copepods may be affected by water temperature rather than chlorophyll a concentration inthe entrance of the bay

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

Seasonal variation in alkaline phosphatase activity in the central part of Tokyo Bay, 2013

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

著者最終稿公開予定日: 2024-06-01Shareable Link : readable free, charged if you download article