Euphausiid community structure and population structure of Euphausia superba off Adelie Land in the Southern Ocean during austral summer 2003, 2005 and 2008
スポンサーリンク
概要
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The distribution and community structure of euphausiids and the population structure of Euphausia superba were investigated mainly along 140°E off Adelie Land in the Indian Ocean sector of the Southern Ocean during the austral summers of 2003, 2005 and 2008. Euphausiids were collected from six discrete depth layers, primarily between 0 and 2000 m, using an RMT 8 net. Euphausia frigida and Euphausia triacantha mainly occurred north of the Southern Boundary of the Antarctic Circumpolar Current (SB) whereas E. superba was distributed south of the SB, and occurred abundantly in the continental slope area where Antarctic Winter Water was observed. E. frigida and E. triacantha occurred in the upper 200 m during the night whereas they were mainly found below 200 m during the daytime. Cluster analysis on stations suggested that the SB is an important biological boundary for euphausiid communities. The population structure of E. superba in 2003 was different from that of 2005 and 2008. While large mature individuals dominated in 2003, small immature krill (juveniles and subadult males) were more abundant in 2005 and 2008. Further sea-ice extension in the preceding winter in 2005 and 2008 likely provided favourable conditions for spawning and survival. A cluster analysis based on similarity of the maturity stages of E. superba revealed that mature males and gravid females (stage IIIC–E) were mainly distributed in the offshore area and mesopelagic zone, while juveniles and subadult males were found in the epipelagic zone of the continental slope area. Therefore, it is considered that E. superba migrates to the offshore area and mesopelagic zone as it grows.
著者
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Hosie Graham
Australian Antarctic Division
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茂木 正人
東京海洋大学海洋科学部魚類学研究室
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茂木 正人
東京海洋大学
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ONO Atsushi
Department of Neurosurgery, Yokohama City University School of Medicine
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AMAKASU KAZUO
Department of Ocean Science, Tokyo University of Marine Science and Technology
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Masato Moteki
Faculty Of Marine Science Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato Tokyo
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Moteki Masato
Laboratory Of Ichthyology Tokyo University Of Marine Science And Technology
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Moteki Masato
Laboratory Of Ichthyology Tokyo University Of Fisheries
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Moteki Masato
Department Of Marine Biotechnology Fukuyama University
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ISHIMARU Takashi
Department of Ocean Science, Tokyo University of Fisheries.
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Horimoto Naho
Department of Ocean Sciences, Tokyo University of Fisheries
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Ishimaru Takashi
Department Of Marine Environmental Sciences Faculty Of Fisheries Tokyo University Of Fisheries
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Amakasu Kazuo
Department Of Ocean Science Tokyo University Of Marine Science And Technology
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Ono Atsushi/moteki
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku
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Amakasu Kazuo/ono
Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku Tokyo 108-8477 Japan/tokyo U
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Amakasu Kazuo/ono
Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku Tokyo 108-8477 Japan/tokyo U
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Amakasu Kazuo
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku
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Ishimaru Takashi
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku
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Ishimaru Takashi
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato 10
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Toda Ryoji
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato
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Hirano Daisuke
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato
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Moteki Masato
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato 10
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Moteki Masato
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku
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Moteki Masato
Faculty Of Marine Science Tokyo University Of Marine Sciences And Technology 4-5-7 Konan Minato Toky
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Hirano Daisuke
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku
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Horimoto Naho
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku
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Hosie Graham
Australian Antarctic Division Department Of Sustainability Environment Water Population And Communit
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Toda Ryoji
Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku
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Horimoto Naho
Department Of Marine Sciences Tokyo University Of Marine Science And Technology
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Ono Atsushi
Department Of Neurosurgery Yokohama City University School Of Medicine
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