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Crossing test among floating Ulva thalli forming `green tide' in Japan

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Abstract

Crossing tests were made to determine the relationship between the identified Ulva pertusa, which commonly grows in Japan as an attached form on exposed rocks, and the floating Ulva forming "green tide" inside calm bays. The floating Ulva thalli were collected from five major green tide sites in Japan (Yokohama, Mikawa, Miyajima, Kochi and Hakata). Reproductive maturation was induced in U. pertusa and the floating thalli from each site. Mating between induced gametes was observed. It is therefore believed that the floating thalli from Yokohama, Mikawa and Miyajima were mainly U. pertusa, while those from Kochi and Hakata were of a different species (Ulva sp.1). Furthermore, the Ulva species found in Mikawa is also a species (Ulva sp.2) different from both U. pertusa and Ulva sp.1.

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Author notes

  1. Masanori Hiraoka

    Present address: Kochi Prefectural Deep Seawater Laboratory (NEDO fellow), Maruyama, Murotomisaki, Muroto, Kochi, 781-7101, Japan

Authors and Affiliations

  1. Marine Algae Research Co. Ltd., 3-9-4 Minatozaka, Shingu, Kasuya, Fukuoka, 811-0114, Japan

    Masanori Hiraoka

  2. Usa Marine Biological Institute, Kochi University, Usa, Tosa City, Kochi, 781-1164, Japan

    Masao Ohno

  3. Department of Fisheries, Faculty of Agriculture, Kyushu University, Fukuoka, 812-0053, Japan

    Shigeo Kawaguchi

  4. National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, Ohno, Saeki, Hiroshima, 739-0452, Japan

    Goro Yoshida

Authors
  1. Masanori Hiraoka
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  2. Masao Ohno
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  3. Shigeo Kawaguchi
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  4. Goro Yoshida
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Hiraoka, M., Ohno, M., Kawaguchi, S. et al. Crossing test among floating Ulva thalli forming `green tide' in Japan. Hydrobiologia 512, 239–245 (2004). https://doi.org/10.1023/B:HYDR.0000020332.12641.a2

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  • DOI: https://doi.org/10.1023/B:HYDR.0000020332.12641.a2

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