Sympatric, Simultaneous, and Random Mating Between Markless Trout (Iwame; Oncorhynchus iwame) and Red-spotted Masu Salmon (Amago; Oncorhynchus masou ishikawae)(Reproductive Biology)

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概要

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• The markless trout (iwame, Oncorhynchus iwame) has long been suspected not to be an independent species, but rather a markless mutant form of the red-spotted masu salmon (amago, O. masou ishikawae). Nevertheless, no field study has examined this issue. Here we report a field study on the reproductive ecology of iwame and amago coexisting in the upper stream of the Inabe River. We found that iwame and amago mate sympatrically, simultaneously, and randomly, and observed five cases of heterogeneous oviposition between the two. Our results suggest that no pre-mating reproductive isolation exists between iwame and amago. Because previous studies have shown the absence of post-mating isolation, we propose that iwame and amago are the same species. Iwame should be considered as a markless form of the red-spotted masu salmon, and O. iwame as a junior synonym of O. masou ishikawae.

• 社団法人日本動物学会の論文
• 2006-01-25

著者

• Shimizu Yoshitaka

  The Inabe River Iwame Research Group

• Kano Yuichi

  Mie Univ. Mie Jpn

• Kano Yuichi

  Department Of Bioresources Graduate School Of Mie University

• Kondou Kouzou

  The Inabe River Iwame Research Group

関連論文

• GEDIMAP : a database of genetic diversity for Japanese freshwater fishes
• Sympatric, Simultaneous, and Random Mating Between Markless Trout (Iwame; Oncorhynchus iwame) and Red-spotted Masu Salmon (Amago; Oncorhynchus masou ishikawae)(Reproductive Biology)
• Present status and conservation of the markless forms of stream-resident masu salmon Oncorhynchus masou (the so-called 'iwame') in Japanese mountain streams
• Distribution of the oriental weatherloach, Misgurnus anguillicaudatus, in paddy fields and its implications for conservation in Sado Island, Japan

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