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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 3 | PAGES 443-454 | 1998
© Oxford University Press

research-article

Infection of Coscinodiscus spp. by the parasitoid nanoflagellate Pirsonia diadema: II. Selective infection behaviour for host species and individual host cells

Stefanie F. Kühn

Marine Botany (FB 2), University of Bremen PO Box 330 440, D-28334 Bremen, Germany

Received on February 14, 1997; accepted on October 28, 1997 The parasitoid nanoflagellate (PNF) Pirsonia diadema is host specific for the marine centric diatom Coscinodiscus spp. Experiments showed that flagellates significantly prefer C. wailesii over C.granii as host species (interspecific selectivity). This preference was independent of light conditions (dark, irradiance of 10 and 70 µmol m–2 s–1) and temperature (10 and 15°C). Among unicellular host diatoms, the infection behaviour was selective for individual cells: already infected C.granii cells were more attractive for further flagellate attachment than non-infected cells (intraspecific selectivity). Individual cells (~1%) remained uninfected for some time. Coscinodiscus granii cultures kept in darkness were more rapidly infected than those kept in the light. It is suggested that photosynthesis enhances the formation of individual physiological properties of diatoms leading to intraspecific variability of susceptibility.


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S. F. Kuhn and M. Hofmann
Infection of Coscinodiscus granii by the parasitoid nanoflagellate Pirsonia diadema: III. Effects of turbulence on the incidence of infection
J. Plankton Res., December 1, 1999; 21(12): 2323 - 2340.
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