Surface zooplankton distribution in the Drake Passage recorded by Continuous Plankton Recorder (CPR) in late austral summer of 2000
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概要
- 論文の詳細を見る
We investigated the composition, distribution, and abundance of zooplankton in the Drake Passage in February 2000 using a Continuous Plankton Recorder. Zooplankton abundance varied considerably, between 1 and 1537 individuals/segment (where a segment is 5 nautical miles of surface towing) (mean ± SD = 121.3 ± 200.9). The highest abundances were recorded in the vicinity of the Polar Front (PF). Abundances increased at low latitudes north of the Sub-Antarctic Front (SAF) and decreased northward. A positive correlation was observed between zooplankton abundance and chlorophyll a concentration, reflecting the higher abundance of zooplankton north of the SAF, where higher abundances of phytoplankton were also observed. A total of 21 species/taxa of zooplankton were classified. Small calanoid copepods were found throughout the transect and accounted for 57.5% of total zooplankton abundance, followed by the Cyclopoid copepods Oithona spp. (25.9%) and Calanus simillimus (8.4%). The results of cluster analyses reveal that small calanoid copepods were the most important contributors to the high zooplankton abundance around the PF and north of the SAF in the Drake Passage. We suggest that a change in species composition has occurred since Hardy's descriptions in 1927, from abundant larger copepods and chaetognaths to smaller copepods and other species.
著者
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Hosie Graham
Australian Antarctic Division
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Takahashi Kunio
Faculty of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan
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Kawaguchi So
Australian Government Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia
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Toda Tatsuki
Faculty of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan
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Naganobu Mikio
National Research Institute of Far Seas Fisheries, 2-12-4 Fukuura, Kanazawa-ku, Yokohama-shi, Kanaga
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Fukuchi Mitsuo
National Institute of Polar Research, 10-3 Midori-cho, Tachikawa-shi, Tokyo 190-8518, Japan
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Hosie Graham
Australian Government Antarctic Division Channel Highway Kingston Tasmania 7050 Australia
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G.w. Hosie
Australian Government Antarctic Division Channel Highway Kingston Tasmania 7050 Australia
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Toda Tatsuki
Faculty Of Engineering Soka University 1-236 Tangi-cho Hachioji Tokyo 192-8577 Japan
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戸田 龍樹
創価大学工学部環境共生工学科
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Toda Tatsuki
Facuity Of Engineering Soka University
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戸田 龍樹
創価大学工学部
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Kawaguchi So
Australian Government Antarctic Division Channel Highway Kingston Tasmania 7050 Australia
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Naganobu Mikio
National Research Institute Of Far Seas Fisheries
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Naganobu Mikio
National Research Institute Of Far Seas Fisheries 2-12-4 Fukuura Kanazawa-ku Yokohama-shi Kanagawa 2
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Takahashi Kunio
Faculty Of Engineering Soka University 1-236 Tangi-cho Hachioji Tokyo 192-8577 Japan
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Hosie G
Australian Government Antarctic Division Channel Highway Kingston Tasmania 7050 Australia
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戸田 龍樹
創価大学工学部 環境共生工学科
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Fukuchi M
National Institute Of Polar Research 10-3 Midori-cho Tachikawa-shi Tokyo 190-8518 Japan
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Fukuchi Mitsuo
National Inst. Of Polar Res. Kaga Tokyo 173-8515 Jpn
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Fukuchi Mitsuo
National Inst. Of Polar Res. 10-3 Midori-cho Tachikawa Tokyo 190-8518 Jpn
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