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http://dx.doi.org/10.7850/jkso.2007.12.4.359

Endoparasitic Dinoflagellates, Amoebophrya spp. and their Host Dinoflagellates in Jinhae Bay, Korea  

Park, Jong-Gyu (Department of oceanography, Kunsan National University)
Hur, Hyun-Jung (Welfare and Environment Bureau, Gimhae City Hall)
Coats, D. Wayne (Smithsonian Environmental Research Center)
Yih, Won-Ho (Department of oceanography, Kunsan National University)
Ha, Na (Department of oceanography, Kunsan National University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.12, no.4, 2007 , pp. 359-369 More about this Journal
Abstract
Amoebophrya is an obligate endoparasitic eukaryotic dinoflagellate infecting host species and eventually killing them within a short period. Because of its host specificity and significant impacts on population dynamics of host species, it has long been proposed to be a potential biological agent for controlling harmful algal bloom (HAB). For several decades, the difficulties of culturing host - parasite systems have been a great obstacle to further research on the biology of Amoebophrya but recent success of several culture systems reactivates this research field. In this study, as a preliminary work for understanding the impacts of Amoebophrya on the population dynamics of host species, semimonthly occurrence of infected host dinoflagellates by Amoebophrya spp. had been observed in Jinhae Bay for two years and with a host - parasite system cultivated, host specificity of Amoebophrya spp. on several dinoflagellates was tested. Amoebophrya spp. were observed in the cellular organelle and cytoplasm of several species including Akashiwo sanguinea, Ceratium fusus, Dinophysis acuminata, Heterocapsa triquetra, Oblea sp., Prorocentrum minimum, P. triestinum, Scrippsiella spinifera, and S. trochoidea. Among them two host - parasite systems for an athecate dinoflagellate, A. sanguinea, and for a thecate dinoflagellate, H. triquetra, had been able to be successfully established as laboratary cultures. Cross-infection tests for 6 species of dinoflagellates in which Amoebophrya was observed or had been reported to exist confirmed high preference for host species of the parasite. Through the continuous research on Amoebophrya occurring in Korean coastal waters, we need to maintain various host - parasite culture systems, which will be very helpful for understanding its ecological role in marine food webs and for applying the species to biologically control harmful algal blooms.
Keywords
Harmful Algal Bloom; Parasitic Dinoflagellate; Amoebophrya; Dinospore; Jinhae Bay; Heterocapsa triquetra;
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