ALGAE

  • 제38권1호
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  • Pages.57-70
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  • 2023
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  • 1226-2617(pISSN)
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  • 2093-0860(eISSN)
한국조류학회(藻類) (The Korean Society of Phycology)
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Feeding by common heterotrophic protists on the mixotrophic dinoflagellate Ansanella granifera (Suessiaceae, Dinophyceae)

  • Hee Chang Kang (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Hae Jin Jeong (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • An Suk Lim (Division of Life Science, Gyeongsang National University) ;
  • Jin Hee Ok (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Ji Hyun You (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Sang Ah Park (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Se Hee Eom (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
  • 투고 : 2023.01.11
  • 심사 : 2023.02.24
  • 발행 : 2023.03.15
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초록

The mortality rate of red-tide dinoflagellates owing to predation is a major parameter that affects their population dynamics. The dinoflagellates Ansanella granifera and Ansanella sp. occasionally cause red tides. To understand the interactions between common heterotrophic protists and A. granifera, we explored the feeding occurrence of nine heterotrophic protists on A. granifera and the growth and ingestion rates of the heterotrophic dinoflagellate Gyrodinium dominans on A. granifera as a function of prey concentration and those of Oxyrrhis marina at a single high prey concentration. The heterotrophic dinoflagellates Aduncodinium glandula, G. dominans, Gyrodinium moestrupii, Luciella masanensis, Oblea rotunda, O. marina, Polykrikos kofoidii, and Pfiesteria piscicida and the naked ciliate Strombidium sp. were able to feed on A. granifera. With increasing mean prey concentrations, the growth and ingestion rates of G. dominans feeding on A. granifera rapidly increased and became saturated or slowly increased. The maximum growth and ingestion rates of G. dominans on A. granifera were 0.305 d-1 and 0.42 ng C predator-1 d-1 (3.8 cells predator-1 d-1), respectively. Furthermore, the growth and ingestion rates of O. marina on A. granifera at 1,700 ng C mL-1 (15,454 cells mL-1) were 0.037 d-1 and 0.19 ng C predator-1 d-1 (1.7 cells predator-1 d-1), respectively. The growth and ingestion rates of G. dominans and O. marina feeding on A. granifera were almost the lowest among those on the dinoflagellate prey species. Therefore, G. dominans and O. marina may prefer A. granifera less than other dinoflagellate prey species. The low mortality rate of A. granifera may positively affect its bloom formation.

키워드

과제정보

We thank Dr. Yeong Du Yoo and Se Hyeon Jang for their support and editors and reviewers for their valuable comments. This research was supported by the National Research Foundation funded by the Ministry of Science and ICT (NRF-2020M3F6A1110582; NRF-2021M3I6A1091272; NRF-2021R1A2C1093379) award to HJJ.

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