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Abnormal asexual reproduction of thalli of Ecklonia stolonifera (Laminariales, Phaeophyceae) off the coast of Nakanoshima in the Oki Islands, Japan

  • Yuichi Hayashi

    Yuichi Hayashi is Deputy Director in Research Institute of Applied Phycology, Okabe Company Ltd. He is working on the ecological study of Ecklonia stolonifera, the application development of unutilized seaweed, and the construction of a seaweed bed.

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    , Masahiro Notoya

    Masahiro Notoya is currently a Visiting Researcher at Kitasato University School of Marine Bioscience and a Professor emeritus of Tokyo University of Marine Science and Technology. He has currently interested in the research on applied science using seaweed, such as conservation of the earth and the marine environment, seaweed biofuels and ecosystem services of marine forest.

    and Norishige Yotsukura

    Norishige Yotsukura is an associate professor in Field Science Center for Northern Biosphere, Hokkaido University. He also serves as the director of Oshoro Marine Station, Hokkaido University. His research interests are on biodiversity, conservation of genetic resources and breeding of kelp.

From the journal Botanica Marina

Abstract

Multiple abnormal individuals of Ecklonia stolonifera with thalli that developed numerous shoot-like structures on the lateral blades were found in two littoral regions of Nakanoshima in the Oki Islands, Shimane Prefecture, Japan. Except for the presence of these diagnostic structures, no other morphological differences were observed between the abnormal and normal individuals. The development of the shoot-like structures isolated from the lateral blade was the same as that of typical vegetative reproductive sporophytes that formed on stolons. In the abnormal individuals, when cultivation was performed using zoospores, the shoot-like structures were observed on the progeny after 18 months of culture and 20.0% of individuals exhibited these structures.

About the authors

Yuichi Hayashi

Yuichi Hayashi is Deputy Director in Research Institute of Applied Phycology, Okabe Company Ltd. He is working on the ecological study of Ecklonia stolonifera, the application development of unutilized seaweed, and the construction of a seaweed bed.

Masahiro Notoya

Masahiro Notoya is currently a Visiting Researcher at Kitasato University School of Marine Bioscience and a Professor emeritus of Tokyo University of Marine Science and Technology. He has currently interested in the research on applied science using seaweed, such as conservation of the earth and the marine environment, seaweed biofuels and ecosystem services of marine forest.

Norishige Yotsukura

Norishige Yotsukura is an associate professor in Field Science Center for Northern Biosphere, Hokkaido University. He also serves as the director of Oshoro Marine Station, Hokkaido University. His research interests are on biodiversity, conservation of genetic resources and breeding of kelp.

Acknowledgments

The authors would like to thank the Fisheries Cooperative Association of Ama-town (Oki Island, Shimane Prefecture) for their assistance with the field surveys and mariculture tests.

References

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Received: 2018-09-15
Accepted: 2019-12-06
Published Online: 2020-01-09
Published in Print: 2020-06-25

©2020 Walter de Gruyter GmbH, Berlin/Boston

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