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JPR Advance Access originally published online on January 24, 2007
Journal of Plankton Research 2007 29(4):347-357; doi:10.1093/plankt/fbm017
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

The occurrence of the Dinophyte species Gymnodinium uberrimum and Peridinium willei in German reservoirs

Verena Niesel1,*, Eberhard Hoehn2, Ralf Sudbrack3, Hartmut Willmitzer4 and Ingrid Chorus1

1 Umweltbundesamt, Corrensplatz 1, 14195 Berlin, Germany 2 Limnologie Büro Hoehn, Glümerstr. 2a, 79102 Freiburg, Germany 3 Landestalsperrenverwaltung des Freistaates Sachsen, 01782 Pirna, Germany, 4 Thüringer Fernwasserversorgung, Haarbergstraße 37, 99097 Erfurt, Germany

* Corresponding author: verena.niesel{at}arcor.de

Received on September 28, 2006; accepted on January 18, 2007


  Abstract

This study developed a statistical approach to predicting the probability of the occurrence of phytoplankton species from the general properties of a water body and the specific conditions at the time of sampling. Here, we report the results for the two Dinophytes Gymnodinium uberrimum and Peridinium willei which frequently cause problems in drinking-water treatment. Our statistical approach addresses the problem of uneven distribution of samples across parameters. For this purpose, we used probability calculation to assess under which conditions the species' occurrence is a likely or an unlikely event. The ecological niches of both species turned out to be similar, as both occur in oligotrophic to mesotrophic, deep, stratified reservoirs at low phosphorus concentrations. However, their pH and temperature range differed: G. uberrimum occurred predominantly between pH 6 and 7 and at a temperature range up to 16°C, whereas P. willei showed a wider pH range and a temperature range below 12°C. With these results, the classification of P. willei within the functional group Lo proposed by Reynolds et al. (Reynolds et al., 2002) is now underpinned with a substantial database. The results suggest G. uberrimum to fit into this association as well.

Communicating editor: K.J. Flynn


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