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 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 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 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
Hayashi, Y., M. Notoya and N. Yotsukura. 2017. Identity of ecklonian kelps, which have similarity to Ecklonia stolonifera Okamura (Laminariales, Phaeophyta), in Nishinoshima coast of Oki Islands, Shimane Prefecture, Japan. Algal Res. 10: 1–17.Search in Google Scholar
Ito, T. and O. Ezaki. 1991. Study on the productivity of seaweed Bed-II. Productivity of Eclonia stolonifera Okamura Community in Iwaya North Coast of Fukuoka Prefecture. Bull. Fukuoka Fish. Exp. Stn. 17: 33–38. (in Japanese).Search in Google Scholar
Kawashima, S. 1993a. An illustrated guide to Japanese Laminariales. Kita Nihon Kaiyo Center, Sapporo. pp. 206. (in Japanese).Search in Google Scholar
Kawashima, S. 1993b. Cultivation of the brown algae, Laminaria “Kombu”. In: (M. Ohno and A.T. Critchley, eds) Seaweed cultivation and marine ranching. JICA, Tokyo, Japan. pp. 27–33.Search in Google Scholar
Nishizawa, K. and M. Chihara. 1979. Methods in phycological studies. Kyoritsu, Tokyo. pp. 754. (in Japanese).Search in Google Scholar
Notoya, M. and Y. Aruga. 1990. Relation between size and age of holdfasts of Ecklonia stolonifera Okamura (Laminariales, Phaeophyta) in northern Honshu, Japan. Hydrobiologia 204/205: 241–246.10.1007/978-94-009-2049-1_34Search in Google Scholar
Notoya, M. and Y. Aruga. 1992. Unusual from of Ecklonia stolonifera Okamura (Laminariales, Phaeophyta). La mer. 30: 43–45.Search in Google Scholar
Notoya, M. 2003. Seaweed of marine forest and its developmental technology. Seizando-shoten, Tokyo. (in Japanese).Search in Google Scholar
Ohno, M. and M. Matsuoka. 1993. Undaria cultivation “Wakame”. Seaweed Cultivation and Marine Ranching. JAICA: 41–49.Search in Google Scholar
Okamura, K. 1936. Nippon kaiso-shi. Uchida Rokakuho Publ. Co., Tokyo. pp. 964. (in Japanese).Search in Google Scholar
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