2000 Fiscal Year Annual Research Report

ウナギ魚類の起源と進化に関する研究

Research Project

Project/Area Number	11691177
Research Institution	The University of Tokyo
Principal Investigator	塚本勝巳東京大学, 海洋研究所, 教授 (10090474)
Co-Investigator(Kenkyū-buntansha)	小川和夫東京大学, 農学生命科学研究科, 助教授 (20092174) 金子豊二東京大学, 海洋研究所, 助教授 (70221190) 西田睦東京大学, 海洋研究所, 教授 (90136896) 青山潤東京大学, 海洋研究所, 学振特別研究員大竹二雄三重大学, 生物資源学部, 助教授 (20160525)
Keywords	ウナギ / 回遊 / 進化 / 適応機構 / 分子系統 / 塩類細胞 / 耳石 / mtDNA
Research Abstract	インドネシア・スラウェシ島,アイスランド,中国でウナギの起源と進化に関する生態調査を実施し,以下の成果を得た。 1.回遊メカニズムの解明:スラウェシ島ポイガル川河口で4年間に亘って実施してきたシラスウナギの接岸回遊調査をまとめたところ,(1)Anguilla celebesensis,A.marmorata,A.bicolor pacificaの3種が出現すること,(2)接岸量はA.celebesensis,A.marmorata,A.bicolor pacificaの順に多く,A.bicolor pacificaは前2者に比べて著しく少ないこと,(3)A.celebesensisとA.marmorataの2種はほぼ周年に亘って接岸し,耳石の解析からこれら2種の産卵期はほぼ周年に亘っていることなどが明らかになった。一方,アイスランドの調査では,(1)A.anguillaとA.rostrataの2種が接岸し,前者(95%)が後者(5%)に比べて著しく多いこと,(2)2種の接岸時期は5〜6月の新月前後と,極めて短期間に限られていること,また(3)銀ウナギの降河回遊時期は10〜12月であることなどの知見が得られた。これらはさらに詳しい解析を実施中である。 2.種分化過程と類縁系統関係の解明:世界中より集めたウナギ属魚類全18種・亜種の分類学的再検討を実施した。従来の形態学的検討に加えて分子遺伝学的解析を行ったところ,ウナギ属魚類は15種に整理するのが適切と考えられた。加えて世界各国の博物館所蔵の模式標本の計測・計数結果を総合してそれぞれのシノニムについても検討し,15種の種名を再検討した。さらに現在これらの種内集団構造の解析を進めている。

Research Products
(15 results)

All Other

All Publications (15 results)

[Publications] AOYAMA,Jun: "Molecular phylogeny and evolution of the freshwater eel, genus Anguilla"Molecular Phylogenetics and Evolution. (in press). (2001)
[Publications] AOYAMA,Jun.: "Molecular approach for species identification of eggs with respect to determination of the spawning site of the Japanese eel Anguilla japonica"Fisheries Science. 67(in press). (2001)
[Publications] ARAI,Takaomi: "Early life history of tropical Anguilla leptocephali in the Western Pacific Ocean."Marine Biology. (in press). (2001)
[Publications] INAGAKI,Tadashi: "Transportaion of eel leptocephali in their spawning area"Proceedings of "The 3rd East Asian Sumposium on Eel Research". (in press). (2001)
[Publications] INOUE,G.Jun: "Complete Mitochondrial DNA Sequence of Conger myriaster (Teleostei : Anguilliformes) : Novel Gene Order for Vertebrate Mitochondrial Genomes and the Phylogenetic Implications for Anguilliform Families."Molecular Biology and Evolution. (in press). (2001)
[Publications] ISHIKAWA,Satoshi: "Utility of microsatellite for Eel Study."Proceedings of "The 3rd East Asian Sumposium on Eel Research". (in press). (2001)
[Publications] MARUI,Miho: "Comparison of early life history between New Zealand temperate eels and Pacific tropical eels revealed by otolith microstructure and microchemistry."Marine Ecology of Progress Series. (in press). (2001)
[Publications] MILLER Michael J.: "Evidence of a spawning area of Anguilla marmorata in the North Equatorial Current of the Western North Pacific."Proceedings of "The 3rd East Asian Sumposium on Eel Research". (in press). (2001)
[Publications] AOYAMA,Jun: "Are morphological characters distinctive enough to discriminate between two species of freshwater eels, Anguilla celebesensis and A. interioris?"Icthyological Research. 47. 157-161 (2000)
[Publications] AOYAMA,Jun: "Discrimination of catadromous eels of genus Anguilla using polymor phism analysis of the mitochondrial 16S ribosomal RNA domain."Transactions of American Fisheries Society. 129. 873-878 (2000)
[Publications] AOYAMA,Jun: "The European eel, Anguilla anguilla (L) in Japanese waters"DANA. 12. 1-5 (2000)
[Publications] ARAI,Takaomi: "Validation of otolith daily increments in the tropical eel, Anguilla celebesensis."Canadian Journal of Zoology. 78. 1078-1084 (2000)
[Publications] ARAI,Takaomi: "Timing of metamorphosis and larval segregation of the Atlantic eels Anguilla rostrata and A.anguilla, as revealed by otolith microstructure."Marine Biology. 137. 39-45 (2000)
[Publications] ISHIKAWA,Satoshi: "Gene rearrangement around the control region in the mito-chondrial genome of conger eel Conger yriaster."Fishiries Science. 66. 1186-1188 (2000)
[Publications] 塚本勝巳: "ウナギ大回遊の謎を解く"世界文化社(地球を救う50の提案農学・21世紀への挑戦). 10(50-59) (2000)

2000 Fiscal Year Annual Research Report

ウナギ魚類の起源と進化に関する研究

Principal Investigator

塚本 勝巳 東京大学, 海洋研究所, 教授 (10090474)

Research Products

[Publications] AOYAMA,Jun: "Molecular phylogeny and evolution of the freshwater eel, genus Anguilla"Molecular Phylogenetics and Evolution. (in press). (2001)

[Publications] AOYAMA,Jun.: "Molecular approach for species identification of eggs with respect to determination of the spawning site of the Japanese eel Anguilla japonica"Fisheries Science. 67(in press). (2001)

[Publications] ARAI,Takaomi: "Early life history of tropical Anguilla leptocephali in the Western Pacific Ocean."Marine Biology. (in press). (2001)

[Publications] INAGAKI,Tadashi: "Transportaion of eel leptocephali in their spawning area"Proceedings of "The 3rd East Asian Sumposium on Eel Research". (in press). (2001)

[Publications] INOUE,G.Jun: "Complete Mitochondrial DNA Sequence of Conger myriaster (Teleostei : Anguilliformes) : Novel Gene Order for Vertebrate Mitochondrial Genomes and the Phylogenetic Implications for Anguilliform Families."Molecular Biology and Evolution. (in press). (2001)

[Publications] ISHIKAWA,Satoshi: "Utility of microsatellite for Eel Study."Proceedings of "The 3rd East Asian Sumposium on Eel Research". (in press). (2001)

[Publications] MARUI,Miho: "Comparison of early life history between New Zealand temperate eels and Pacific tropical eels revealed by otolith microstructure and microchemistry."Marine Ecology of Progress Series. (in press). (2001)

[Publications] MILLER Michael J.: "Evidence of a spawning area of Anguilla marmorata in the North Equatorial Current of the Western North Pacific."Proceedings of "The 3rd East Asian Sumposium on Eel Research". (in press). (2001)

[Publications] AOYAMA,Jun: "Are morphological characters distinctive enough to discriminate between two species of freshwater eels, Anguilla celebesensis and A. interioris?"Icthyological Research. 47. 157-161 (2000)

[Publications] AOYAMA,Jun: "Discrimination of catadromous eels of genus Anguilla using polymor phism analysis of the mitochondrial 16S ribosomal RNA domain."Transactions of American Fisheries Society. 129. 873-878 (2000)

[Publications] AOYAMA,Jun: "The European eel, Anguilla anguilla (L) in Japanese waters"DANA. 12. 1-5 (2000)

[Publications] ARAI,Takaomi: "Validation of otolith daily increments in the tropical eel, Anguilla celebesensis."Canadian Journal of Zoology. 78. 1078-1084 (2000)

[Publications] ARAI,Takaomi: "Timing of metamorphosis and larval segregation of the Atlantic eels Anguilla rostrata and A.anguilla, as revealed by otolith microstructure."Marine Biology. 137. 39-45 (2000)

[Publications] ISHIKAWA,Satoshi: "Gene rearrangement around the control region in the mito-chondrial genome of conger eel Conger yriaster."Fishiries Science. 66. 1186-1188 (2000)

[Publications] 塚本勝巳: "ウナギ大回遊の謎を解く"世界文化社(地球を救う50の提案 農学・21世紀への挑戦). 10(50-59) (2000)

塚本勝巳東京大学, 海洋研究所, 教授 (10090474)

[Publications] 塚本勝巳: "ウナギ大回遊の謎を解く"世界文化社(地球を救う50の提案農学・21世紀への挑戦). 10(50-59) (2000)