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Journal of Plankton Research Vol.25 no.3 pp.273-278, 2003
© Oxford University Press 2003

Small-scale vertical distribution of phytoplankton, nutrients and sulphide below the oxycline of a mesotrophic lake

Frank Gervais1,*, Ulrike Siedel1, Britta Heilmann1, Guntram Weithoff1,1, Gabriele Heisig-Gunkel1,2 and Andreas Nicklisch1,3

1 Department of Shallow Lakes and Lowland Rivers, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, 12587 Berlin, and 2 Glp-Consulting Für Gewässer, Landschaft, Planung, Technologiezentrum Hennigsdorf, neuendorfstrasse 18a, 16761 Hennigsdorf, Germany

* Corresponding Author: lobelia{at}t-online.de

1 Present Address: Institute for Biochemistry and Biology, University of Potsdam, Maulbeerallee 2, D-14469 Potsdam, Germany

3 Present Address: Humboldt-Universität Zu Berlin, Institut Für Biologie, Ag ökophysiologie, Unter Den Linden 6, 10099 Berlin, Germany

A characteristic vertical sequence of phytoplankton populations was observed below the metalimnetic oxycline of a stratified, mesotrophic lake. Ceratium spp., Closterium acutum and Aphanizomenon flos- aquae were present in the epilimnion but had distinct population maxima in the microaerobic chemocline. Below these populations, Cryptomonas phaseolus, Planktothrix clathrata, Pseudanabaena catenata and Limnothrix sp. followed each other in the transition zone between the chemocline and the sulphide-containing hypolimnion. The dominating populations of P. clathrata and P. catenata caused a deep chlorophyll maximum. Phytoplankton structure was determined by the vertical gradients of sulphide and light. Compared with the epilimnion, nutrient availability was not fundamentally better below the oxycline but the algae might have benefited from reduced grazing pressure in their habitat.


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