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Fungal Infections of the Phytoplankton: Seasonality, Minimal Host Density, and Specificity in a Mesotrophic Lake by HARALD HOLFELD is a Agricultural and Biological Sciences article available to read on EtoBox.

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Phytoplankton infections by fungal parasites in the upper, mixed layer of a mesotrophic northern temperate lake were analysed according to the following parameters: host and parasite species, host population density and prevalence of infection, resting spore formation by the parasite, and the lowest host density at which parasites appeared. The phytoplankton taxa recorded included the Cyanobacteria, Dinomastigota, Chrysophyceae, Bacillariophyceae, Chlorophyceae, Cryptophyceae and Haptophyceae, but infection was never found in the last two classes. The parasites belonged almost exclusively to the monocentric Chytridiomycetes. Fungal epidemics occurred at all times of the year. Parasites appeared at population densities as low as about 1 cell ml^−1^ in some host species, with infection prevalence sometimes exceeding 80%. The proportion of the total phytoplankton biovolume infected by fungi was usually much <1%, but occasionally reached 10%. Parasitism proved to be highly species‐specific, with one parasite species usually infecting only one host species. In the case of __Zygorhizidium planktonicum__, which infected both __Asterionella formosa__ and __Synedra acus__, there is evidence

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Author

HARALD HOLFELD

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Cambridge University Press (CUP); Wiley (ISSN 0028-646X)

Published

1998

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)