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Ciliate grazing on the parasite Amoebophrya sp. decreases infection of the red-tide dinoflagellate Akashiwo sanguinea

2002; Inter-Research Science Center; Volume: 28; Linguagem: Inglês

10.3354/ame028069

1616-1564

Magnus Johansson, D. Wayne Coats,

Microbial Community Ecology and Physiology

AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 28:69-78 (2002) - doi:10.3354/ame028069 Ciliate grazing on the parasite Amoebophrya sp. decreases infection of the red-tide dinoflagellate Akashiwo sanguinea Mona Johansson1,*, D. Wayne Coats2 1Department of Systems Ecology, Stockholm University, Svante Arrhenius väg 21a, 10691 Stockholm, Sweden 2Smithsonian Environmental Research Center, PO Box 28, Edgewater, Maryland 21037-0028, USA *E-mail: mojo@system.ecology.su.se ABSTRACT: Parasitic dinoflagellates of the genus Amoebophrya commonly infect free-living dinoflagellates, some of which cause toxic or otherwise harmful red tides. These parasites prevent reproduction of their hosts and kill infected cells on a time scale of days. Thus, epidemic outbreaks of Amoebophrya spp. are thought to facilitate the decline of red tides by causing mass mortality of host taxa. However, little is known about biotic and abiotic factors that regulate epidemic occurrence of Amoebophrya spp. in nature. We addressed the hypothesis that grazing by ciliate microzooplankton on the infective stage of Amoebophrya sp. can regulate parasite prevalence in the bloom-forming dinoflagellate Akashiwo sanguinea. In culture, the choreotrich ciliate Strobilidium sp. rapidly ingested and digested infective dinospores of Amoebophrya sp. ex A. sanguinea. Laboratory experiments also showed that grazing by Strobilidium sp. could decrease infection of A. sanguinea by 70 to 80% relative to controls. Field experiments using plankton assemblages from Chesapeake Bay, USA, indicated that grazing by natural populations of ciliates may contribute to the regulation of parasitism in A. sanguinea. Thus, grazing by ciliates and other microzooplankton may indirectly influence the occurrence of red tides by limiting the spread of parasites like Amoebophrya sp. KEY WORDS: Parasitic dinoflagellate · Harmful algal bloom · Ciliate grazing · Amoebophrya sp. · Akashiwo sanguinea · Strobilidium sp. · Chesapeake Bay Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 28, No. 1. Online publication date: May 16, 2002 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2002 Inter-Research.