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New record of Sargassum denticarpum Ajisaka (Fucales, Phaeophyceae) from Iriomote Island (Ryukyu Archipelago, Japan)

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Published/Copyright: March 14, 2012
Botanica Marina
From the journal Botanica Marina Volume 55 Issue 3

Abstract

The brown macroalgal genus Sargassum forms beds around the Japanese coast; these beds are important for marine ecosystem functioning and fisheries. In recent years, a northward shift in the distribution patterns of southern Sargassum spp. has been postulated as a result of warming in the western Pacific. To examine this theory, we surveyed species richness and diversity of genus Sargassum algae around the Ryukyu Islands, Japan, which is the northern limit of selected Sargassum species native to tropical and subtropical regions. We collected from Iriomote Island (Ryukyu Archipelago) specimens of a species resembling Sargassum denticarpum, which is endemic to Vietnam. The specimens had the following morphological characteristics in common with S. denticarpum: (1) terete or slightly compressed primary branches, (2) simple lanceolate primary and lateral leaves with dentate margins in all stages, (3) spherical-to-elliptical vesicles with or without spines and wings, (4) monoecious, and (5) compressed receptacles with spines on the margins. In addition, internal transcribed spacer 2 (ITS2) sequences of the Ryukyu specimens and of S. denticarpum collected in Vietnam clearly showed that the two are closely related. On the basis of these morphological and molecular characteristics, we present the first report of S. denticarpum in Japan.

Keywords: Iriomote Island; ITS2; Okinawa; Sargassum denticarpum; Togemi-moku
Corresponding author
Received: 2010-9-5
Accepted: 2012-2-1
Published Online: 2012-03-14
Published in Print: 2012-06-01

©2012 by Walter de Gruyter Berlin Boston

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https://doi.org/10.1515/bot-2012-0107
Keywords for this article
Iriomote Island; ITS2; Okinawa; Sargassum denticarpum; Togemi-moku

Articles in the same Issue

  1. Masthead
  2. Masthead
  3. Research Articles
  4. Fucoid assemblages on the north coast of Spain: past and present (1977–2007)
  5. New record of Sargassum denticarpum Ajisaka (Fucales, Phaeophyceae) from Iriomote Island (Ryukyu Archipelago, Japan)
  6. Seasonal periodicity and reproduction of brown algae (Phaeophyceae) at Puerto Deseado (Patagonia)
  7. Determining bathymetric distributions of the eelgrass Zostera marina L. in three turbid estuaries on the eastern North Pacific coast
  8. Morphological and molecular evidence demonstrates the amphi-Atlantic distribution of Laurencia catarinensis (Ceramiales, Rhodophyta)
  9. Effects of temperature, salinity, irradiance, and nutrients on the development of carposporelings and tetrasporophytes in Gracilaria domingensis (Kütz.) Sonder ex Dickie (Rhodophyta, Gracilariales)
  10. A novel method for phosphoprotein extraction from macroalgae
  11. Antioxidants in mangrove plants and endophytic fungal associations
  12. The marine halophytes Carpobrotus edulis L. and Arthrocnemum macrostachyum L. are potential sources of nutritionally important PUFAs and metabolites with antioxidant, metal chelating and anticholinesterase inhibitory activities
  13. Culture medium optimization and lipid profiling of Cylindrotheca, a lipid- and polyunsaturated fatty acid-rich pennate diatom and potential source of eicosapentaenoic acid
  14. Short Communications
  15. Application of image analysis software to the morphometrics of Posidonia oceanica (L.) Delile and Cymodocea nodosa (Ucria) Ascherson
  16. Delayed modifications in plant-water relations in the coastal marsh halophyte Spartina patens following sudden increases in soil salinity
  17. Algicidal activity and potential antifouling defenses in macroalgae from the western Antarctic Peninsula including probable synergistic effects of multiple compounds
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