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- Title
INFECTION OF THE BLOOM-FORMING THECATE DINOFLAGELLATESALEXANDRIUM AFFINEANDGONYAULAX SPINIFERABY TWO STRAINS OFAMOEBOPHRYA(DINOPHYTA).
- Authors
Kim, Sunju; Gil Park, Myung; Yih, Wonho; Coats, D.Wayne
- Abstract
In autumn 2002, parasitic dinoflagellates of the genusAmoebophryaKoeppen infected populations of the bloom-forming thecate dinoflagellatesAlexandrium affine(Inoue and Fukuyo) Balech andGonyaulax spinifera(Claparede and Lachmann) Diesing in coastal waters of Korea. Here we present the first documentation ofAmoebophryainfections inA. affineandG. spiniferaand use host–parasite cultures to provide information on parasite development and total generation times. Parasites of the two dinoflagellate hosts differed in their site of infection, developing in the cytoplasm ofA. affinebut in the nucleus ofG. spinifera. Developmental stages of the parasite strains were similar to the previous descriptions ofAmoebophryaspp. infecting other dinoflagellates. A prominent feature ofAmoebophryainfection inA. affinefrom natural field samples was the presence of abnormal“giant cells” in the long chains formed by this host species. The characteristic green autofluorescence ofAmoebophryainfections was not evident under blue light excitation until very late in the infection cycle of theA. affine– Amoebophryasp. system but was detectable throughout the infection cycle in theG. spinifera–Amoebophryasp. system. Despite the relatively long duration (2–10 min) of the emergence process ofAmoebophryaspp. from these thecate hosts, total parasite generation times were shorter (53–55 h) than those previously reported for athecate host–parasite systems. These observations provide the basis for better assessing the impact of parasitism byAmoebophryasp. as a significant loss factor for thecate dinoflagellate populations in Korean waters.
- Subjects
DINOFLAGELLATES; INFECTION; PARASITES; ALGAL populations; PHYTOPLANKTON populations; PHYCOLOGY
- Publication
Journal of Phycology, 2004, Vol 40, Issue 5, p815
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.1529-8817.2004.04002.x