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Journal of Plankton Research Vol.22 no.12 pp.2255-2262, 2000
© Oxford University Press 2000

A rapid Utermöhl method for estimating algal numbers

Rosemary Paxinos and James G. Mitchell

Flinders University of South Australia, GPO Box 2100, Adelaide, SA 5001

The standard method for counting phytoplankton requires 24–48 h of settling (Utermöhl, 1931). The modified Utermöhl method (plunger) described here reduces settling time to 2 h. Estimates of counts for phytoplankton using the plunger method plotted against counts from the Utermöhl method yield a good correlation (r2 = 0.97), and 95–100% of species (>2 µm) recorded in the Utermöhl method were recorded with the plunger method.


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