Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Comparative Ecological Characteristics of Two Potentially Toxic Epiphytic Dinoflagellate Species, Ostreopsis sp. and Coolia canariensis, Native to Jeju Island

  • Mi Ryoung Oh (Department of Marine Biology, College of Ocean Science and Technology, Kunsan National University) ;
  • Hyung Seop Kim (Department of Marine Biology, College of Ocean Science and Technology, Kunsan National University) ;
  • Bora Jang (Department of Marine Biology, College of Ocean Science and Technology, Kunsan National University) ;
  • Jong Hyeok Kim (Department of Marine Biology, College of Ocean Science and Technology, Kunsan National University) ;
  • Keon Gang Jang (Department of Marine Biology, College of Ocean Science and Technology, Kunsan National University) ;
  • Jong Woo Park (Tidal Flat Research Center, National Institute of Fisheries Science) ;
  • Wonho Yih (Department of Marine Biology, College of Ocean Science and Technology, Kunsan National University)
  • Received : 2023.04.20
  • Accepted : 2023.06.07
  • Published : 2023.06.30
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Abstract

Growth responses along the gradient of water temperature, salinity, and light intensity and cytotoxicity against Artemia nauplii were explored using Ostreopsis sp. and Coolia canariensis strains, representing the two potentially toxic epiphytic dinoflagellate (EPD) species from Jeju coastal waters of Korea. Variation in maximum growth rate (GRmax) and maximum biomass yield (Ymax) along the environmental gradients was quite contrasting between the two strains, which appears to be reflected in the in situ abundance distribution of the corresponding genera. The more eurythermal characteristics of Ostreopsis sp. strain were in good agreement with the relative distribution of Ostreopsis spp. and Coolia spp. in 520 macroalgal samples collected from 6 stations. The more stenohaline C. canariensis strain was well matched by a markedly narrower range of salinities in the in situ distribution of Coolia spp. than the salinity range for Ostreopsis species. The differences in light adaptation between the high light-preferring Ostreopsis sp. strain and the more euryphotic C. canariensis strain were remarkably consistent with the distinct vertical profiles of Ostreopsis spp. and Coolia spp. abundance in the red alga Amphiroa sp. off Moom-seom. Cytotoxicity against Artemia nauplii in the Ostreopsis sp. preparation with 1000 cells ml-1 was similar to that in C. canariensis preparation with 12000 cells ml-1, which is noteworthy. Thus, the new potential cytotoxicity risks from C. canariensis along with the well-known toxic genus Ostreopsis may be introduced to Jeju coasts, which necessitates further exploration into the contrasting ecological niches occupied by EPD species in relation to their cytotoxicity.

Keywords

Acknowledgement

This work was supported by the National Institute of Fisheries Science program (NIFS-R2020056), the Jeonbuk Sea Grant program (KIMST-20220163), and a National Research Foundation of Korea grant (NRF-2019R1I1A3A 01058442). We would like to express our sincere thanks to two anonymous reviewers for their constructive comments and suggestions, and Professor Yeong Doo Yoo at Kunsan National University for his kind and considerate comments for the original manuscript.

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