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Natural hybridization between two Japanese medaka species (Oryzias latipes and Oryzias sakaizumii) observed in the Yura River basin, Kyoto, Japan

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Abstract

To determine the actual state of hybridization between two Japanese medaka species (Oryzias latipes and Oryzias sakaizumii) in their natural environment, we used nuclear DNA markers at 10 loci to analyze 215 individuals from eight wild populations in the middle reaches of the Yura River basin in Japan, where the two species are sympatric. Despite large genetic differentiation between the two species, reproductive isolation between them could not be confirmed. We also discussed the formation of the current distribution patterns of the two species and their hybridization zone in the Yura River basin.

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Acknowledgments

We thank Dr. Tomohiko Morimune and Mr. Keisuke Teramura (Kindai University) for their help with sample collections. We are also grateful to Dr. Keisuke Takata, Dr. Mayu Nakano (Shinshu University), Dr. Kazumi Hosoya, Dr. Daisuke Hayasaka, and Mr. Yu Maebara (Kindai University) for their valuable suggestions. We express our gratitude to the two anonymous referees for providing valuable comments. This research was supported by funding from the Kansai Organization for Nature Conservation. This study complies with the current laws of Japan.

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Authors and Affiliations

  1. Program in Environmental Management, Graduate School of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, Nara, 631-8505, Japan

    Yuka Iguchi, Kouki Kume & Tadao Kitagawa

  2. EIKoei Co., Ltd., 4-2-7, Kojimachi, Chiyoda-ku, Tokyo, 102-0083, Japan

    Kouki Kume

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  1. Yuka Iguchi
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  2. Kouki Kume
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  3. Tadao Kitagawa
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Correspondence to Tadao Kitagawa.

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Iguchi, Y., Kume, K. & Kitagawa, T. Natural hybridization between two Japanese medaka species (Oryzias latipes and Oryzias sakaizumii) observed in the Yura River basin, Kyoto, Japan. Ichthyol Res 65, 405–411 (2018). https://doi.org/10.1007/s10228-018-0623-x

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  • DOI: https://doi.org/10.1007/s10228-018-0623-x

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