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Attachai Kantachumpoo,Shinya Uwai,Thidarat Noiraksar,Teruhisa Komatsu 한국해양과학기술원 2015 Ocean science journal Vol.50 No.2
The marine brown algal genus Sargassum has been investigated extensively based on genetic information. In this report, we performed the first comparative study of morphological and molecular data among common species of Sargassum found in Thailand and explored the phylogenetic diversity within the genus. Our results revealed an incongruent pattern for species classification in Thai Sargassum. Morphologically, our Sargassum specimens were distinguishable and represented 8 species, namely, S. aquifolium (Turner) C.Agardh, Sargassum baccularia (Mertens) C. Agardh, S. cinereum J. Agardh, S. ilicifolium (Turner) C.Agardh, S. oligocystum Montagne, S. plagiophyllum C. Agardh, S. polycystum C. Agardh and S. swartzii (Turuner) C. Agardh. In contrast, using three different methods, phylogenetic analysis of nuclear ribosomal internal transcribed spacer 2 (ITS2) revealed six distinct clades, including S. baccularia/S. oligosyntum clade, S. aquifolium/S. swartzii clade, S. cinereum clade, S. aquifolium/S. ilicifolium clade, S. polycystum clade, and S. plagiophyllum clade, which was suggestive of a phenotypic plasticity species complex. Our molecular data also confirmed the paraphyletic relationship in the section Binderianae and suggested that this section requires reassessment. Overall, further studies are required to increase our understanding of the taxonomy, phylogenetic relationships and species boundaries among Sargassum species in Thailand.
Luis E. Aguilar-Rosas,Enrique Valenzuela-Espinoza,Shinya Uwai,Hiroshi Kawai,Ra?l Aguilar-Rosas 한국조류학회I 2007 ALGAE Vol.22 No.1
Sargassum filicinum Harvey, a brown alga (Phaeophyceae) native to Northeastern Asia, has been recently reported from the coast of Southern California (USA). Here we report the occurrence and range extension of this introduced species, as we found the alga at La Jolla and Rancho Packard in Todos Santos Bay, Baja California, Mexico. The first collections of S. filicinum correspond to several immature plants, found on September 8, 2005, drifting in the intertidal zone at La Jolla. Later on November 9, 2006, we found a well-established population in Rancho Packard in the middle intertidal zone to 2 m depth. Since S. filicinum is an annual monoecious species with air bladders, the risk there is a high risk of spreading rapidly along the Pacific, as in the case for S. muticum. The population in Rancho Packard extends 500 m along the coast, consisting mainly of young plants with an average length of 30 cm and a density of 5 thallus/m2. This is the first record of this invasive species for the Mexican Pacific coast, and it represents the southern limit along the Pacific coast of North America. This finding suggests that this invasive species has successfully colonized the Pacific coast of North America and its distributional range is still expanding.
New Record of Sargassum filicinum Harvey (Fucales, Phaeophyceae) in the Pacific Coast of Mexico
Aguilar-Rosas, Luis E.,Aguilar-Rosas, Raul,Kawai, Hiroshi,Uwai, Shinya,Valenzuela-Espinoza, Enrique The Korean Society of Phycology 2007 ALGAE Vol.22 No.1
Sargassum filicinum Harvey, a brown alga (Phaeophyceae) native to Northeastern Asia, has been recently reported from the coast of Southern California (USA). Here we report the occurrence and range extension of this introduced species, as we found the alga at La Jolla and Rancho Packard in Todos Santos Bay, Baja California, Mexico. The first collections of S. filicinum correspond to several immature plants, found on September 8, 2005, drifting in the intertidal zone at La Jolla. Later on November 9, 2006, we found a well-established population in Rancho Packard in the middle intertidal zone to 2 m depth. Since S. filicinum is an annual monoecious species with air bladders, the risk there is a high risk of spreading rapidly along the Pacific, as in the case for S. muticum. The population in Rancho Packard extends 500 m along the coast, consisting mainly of young plants with an average length of 30 cm and a density of 5 thallus/m2. This is the first record of this invasive species for the Mexican Pacific coast, and it represents the southern limit along the Pacific coast of North America. This finding suggests that this invasive species has successfully colonized the Pacific coast of North America and its distributional range is still expanding.