Infection of Coscinodiscus granii by the parasitoid nanoflagellate Pirsonia diadema: III. Effects of turbulence on the incidence of infection |
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Authors: | Kuhn Stefanie F; Hofmann Matthias |
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Institution: | Marine Botany (FB2), University of Bremen, PO Box 330 440, D-28334 Bremen and
1 Department of Biology, University of Konstanz, Jacob-Burckhardt Straße 25, D-74464 Konstanz, Germany |
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Abstract: | The influence of turbulence on the incidence of infection ofthe diatom Coscinodiscus granii by the parasitoid nanoflagellatePirsonia diadema was investigated experimentally with two initialhost densities. Independently of the initial diatom densitiesof 7 and 44 cells ml1, under calm conditions both diatomsand parasitoids became extinct within 69 days. Turbulence,however, led to the survival of diatoms at a reduced densityof 0.12 cells ml1 for >30 days. A population-dynamicmodel is formulated that takes into account the non-homogeneousdistribution of infecting flagellates among host diatoms. Applicationof the results to parasitoiddiatom interactions in naturalwaters suggests that, under turbulent conditions, endemic infectionsmay effectively prevent the mass development of host diatoms. |
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