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ALGAE > Volume 29(2); 2014 > Article
ALGAE 2014;29(2): 153-163. doi: https://doi.org/10.4490/algae.2014.29.2.153
Feeding by common heterotrophic dinoflagellates and a ciliate on the red-tide ciliate Mesodinium rubrum
Kyung Ha Lee1, Hae Jin Jeong1,2,*, Eun Young Yoon2, Se Hyeon Jang1, Hyung Seop Kim3 and Wonho Yih4

1School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, Korea
2Advanced Institutes of Convergence Technology, Suwon 443-270, Korea
3Department of Marine Biotechnology, College of Ocean Sciences, Kunsan National University, Kunsan 573-701, Korea
4Department of Oceanography, College of Ocean Sciences, Kunsan National University, Kunsan 573-701, Korea
*Corresponding Author  Email: hjjeong@snu.ac.kr
Mesodinium rubrum is a cosmopolitan ciliate that often causes red tides. Predation by heterotrophic protists is a critical factor that affects the population dynamics of red tide species. However, there have been few studies on protistan predators feeding on M. rubrum. To investigate heterotrophic protists grazing on M. rubrum, we tested whether the heterotrophic dinoflagellates Gyrodiniellum shiwhaense, Gyrodinium dominans, Gyrodinium spirale, Luciella masanensis, Oblea rotunda, Oxyrrhis marina, Pfiesteria piscicida, Polykrikos kofoidii, Protoperidinium bipes, and Stoeckeria algicida, and the ciliate Strombidium sp. preyed on M. rubrum. G. dominans, L. masanensis, O. rotunda, P. kofoidii, and Strombidium sp. preyed on M. rubrum. However, only G. dominans had a positive growth feeding on M. rubrum. The growth and ingestion rates of G. dominans on M. rubrum increased rapidly with increasing mean prey concentration
Key words: ciliate; growth; harmful algal bloom; ingestion; predation

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