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http://dx.doi.org/10.4490/algae.2021.36.3.4

Comparison of the spatial-temporal distributions of the heterotrophic dinoflagellates Gyrodinium dominans, G. jinhaense, and G. moestrupii in Korean coastal waters  

Lee, Sung Yeon (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
Jeong, Hae Jin (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
Kang, Hee Chang (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
Ok, Jin Hee (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
You, Ji Hyun (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
Park, Sang Ah (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
Eom, Se Hee (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
Publication Information
ALGAE / v.36, no.1, 2021 , pp. 37-50 More about this Journal
Abstract
Heterotrophic dinoflagellates Gyrodinium spp. are one of the major grazers of phytoplankton in many coastal waters. Gyrodinium dominans, G. jinhaense, and G. moestrupii have similar morphologies but different edible prey species. To explore the variations in the ecological niches of these three species, we investigated their spatial-temporal distributions in Korean waters. Because of the high similarity in morphology among these three Gyrodinium species, we used real-time polymerase chain reactions to quantify their abundance in water samples that were seasonally collected from 28 stations along the Korean Peninsula from April 2015 to October 2018. Cells of G. dominans were found at all sampling stations, G. jinhaense at 26 stations, and G. moestrupii at 22 stations, indicating that all three species were widely distributed in Korea. Furthermore, all three species displayed strong seasonal distributions. The largest numbers of the stations where G. dominans and G. jinhaense cells were present were found during the summer (26 and 23 stations, respectively), but that for G. moestrupii was found in the autumn (15 stations). The abundance of G. dominans was positively correlated with that of G. jinhaense, but not with that of G. moestrupii. The highest abundances of G. dominans (202.5 cells mL-1) and G. jinhaense (20.2 cells mL-1) were much greater than that of G. moestrupii (1.2 cells mL-1). The highest abundances of G. dominans and G. jinhaense were found in July, whereas that of G. moestrupii was found in March. The abundances of G. dominans and G. jinhaense, but not G. moestrupii, were positively correlated with water temperature. Therefore, the spatial-temporal distributions of G. dominans and G. jinhaense were closer than those of G. moestrupii and G. dominans or G. jinhaense. This differs from results based on the relative differences in ribosomal DNA sequences and the types of edible prey reported in the literature. Thus, the variations in spatial-temporal distributions and prey species of these three Gyrodinium species suggest that they may have different ecological niches in Korean coastal waters.
Keywords
Chl-a; harmful algal bloom; protist; qPCR; red tide; specific primer;
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