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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 10 | PAGES 1963-1969 | 1998
© Oxford University Press

research-article

Measuring the filtration efficiency of the Continuous Plankton Recorder

A.W. Walne, G.C. Hays1 and P.R. Adams2

SirAlister Hardy Foundation for Ocean Science, The Laboratory Citadel Hill, Plymouth PL1 2PB 1School of Biological Sciences, University of Wales Swansea Singleton Park, Swansea SA2 8PP 2Valeport Ltd Townstal Industrial Estate, Dartmouth, Devon TQ6 9LX

Received on August 6, 1997; accepted on June 4, 1998 The Continuous Plankton Recorder (CPR) survey has analysed over 160 000 plankton samples taken in the North East Atlantic over the last 60 years. However, flowmeters have not been routinely fitted to the recorders and there has been the implicit assumption that a CPR sample represents the organisms filtered from 3 m3 of sea water. We describe an electromagnetic flowmeter designed for the CPR and present results which show that on occasions the filtered volume per sample varied significantly from this value.


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