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The Korean Society of Phycology (한국조류학회(藻類))
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Epibionts associated with floating Sargassum horneri in the Korea Strait

  • Kim, Hye Mi (Department of Oceanography, College of Natural Sciences, Chonnam National University) ;
  • Jo, Jihoon (Marine Ecosystem Disturbing and Harmful Organisms (MEDHO) Research Center) ;
  • Park, Chungoo (Marine Ecosystem Disturbing and Harmful Organisms (MEDHO) Research Center) ;
  • Choi, Byoung-Ju (Department of Oceanography, College of Natural Sciences, Chonnam National University) ;
  • Lee, Hyun-Gwan (Department of Oceanography, College of Natural Sciences, Chonnam National University) ;
  • Kim, Kwang Young (Department of Oceanography, College of Natural Sciences, Chonnam National University)
  • Received : 2019.10.05
  • Accepted : 2019.12.10
  • Published : 2019.12.15
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Abstract

Floating seaweed rafts are a surface-pelagic habitat that serve as substrates for benthic flora and fauna. Since 2008, Sargassum horneri clumps have periodically invaded the Korea Strait. In this study, the polymerase chain reaction-free small-organelles enriched metagenomics method was adopted to identify the species of epibiotic eukaryotes present in floating S. horneri fronds. A total of 185 species were identified, of which about 63% were previously undetected or unreported in Korean waters. The rafts harbored a diverse assemblage of eukaryotic species, including 39 Alveolata, 4 Archaeplastida, 95 Opisthokonts, 4 Rhizaria, and 43 Stramenopiles. Of these 185 taxa, 48 species were found at both Sargassum rafts collection stations and included 24 Stramenopiles, 17 Alveolata, and 7 Opisthokonts. Among these, the highest proportion (50%) of species was photo-autotrophic in basic trophic modes, while the proportion of phagotrophic, osmo- or saprotrophic, and parasitic modes were 43.8%, 4.2%, and 2.1%, respectively. This study demonstrates the contribution of floating Sargassum rafts as dispersal vectors that facilitate the spread of alien species.

Keywords

References

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