Environmental history of Japanese eel, Anguilla japonica collected in Miyako Bay, northeastern Japan
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概要
- 論文の詳細を見る
The environmental history in combination with age of the Japanese eel, Anguilla japonica, collected in Miyako Bay along the Sanriku Coast of Japan, was examined using the otolith microstructure and analysis of strontium (Sr) and calcium (Ca) concentrations with wavelength dispersive X-ray spectrometry by an electron microprobe. The line analysis of Sr : Ca ratios along the life history transect of each otolith showed a peak (ca 12-17×10^<-3>) between the core and elver mark, which corresponded to the period of their leptocephalus and early glass eel stages in the ocean. The mean Sr : Ca ratios from the elver mark to the otolith edge indicated that there were eels with several general categories of migratory history, that included sea eels that never entered freshwater (average Sr : Ca ratios, >6.0×10^<-3>) and others that had entered freshwater for brief periods, but returned to the estuary or bay. This evidence of the occurrence of sea eels indicates that Japanese eels in this northern area do not necessarily migrate into freshwater rivers during recruitment as glass eels at the beginning of their growth phase, and even those that do enter freshwater may later return to the marine environment.
- 東京大学の論文
- 2003-03-28
著者
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宮崎 信之
国立科学博物館動物研究部
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TSUKAMOTO Katsumi
Ocean Research Institute, The University of Tokyo
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Arai T
Otsuchi Marine Research Center Ocean Research Institute University Of Tokyo
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Arai Takaomi
Otsuchi Marine Research Center Ocean Research Institute The University Of Tokyo
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Miyazaki Nobuyuki
Otsuchi Marine Research Center, Ocean Research Institute, University of Tokyo
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Tsukamoto Katsumi
Ocean Research Institute The University Of Tokyo
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塚本 勝巳
The Center For International Cooperation Ocean Research Institute The University Of Tokyo
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KOTAKE AYA
Ocean Research Institute, The University of Tokyo
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Ohji Madoka
Otsuchi Marine Research Center, Ocean Research Institute, The University of Tokyo
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Yamane Sachinobu
Miyako Fishery Cooperative Union
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宮崎 信之
東京大学海洋研究所
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Kotake A
Ocean Research Institute The University Of Tokyo
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Kotake Aya
Ocean Research Institute The University Of Tokyo
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宮崎 信之
東大 海洋研
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Yamato Shigeyuki
Kyoto Univ. Wakayama Jpn
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Miyazaki Nobuyuki
Graduate School Of Frontier Sciences The University Of Tokyo
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