Journal of Plankton Research Vol.22 no.3 pp.473-483, 2000
© Oxford University Press 2000
A test model for optical plankton counter (OPC) coincidence and a comparison of OPC-derived and conventional measures of plankton abundance
Institute of Marine Studies, University of Plymouth, Drake Circus, PlymouthPL4 8AA and 1 Centre for Coastal & Marine Science, Plymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth PL1 3DH, UK
The use of the optical plankton counter (OPC) for processing zooplankton net samples is explored. A comparison of OPC counts and microscope counts from net samples was reasonable. Similarly, OPC biovolume and carbon had a ratio of 23:1 (biovolume:carbon). Coincidence was modelled using the Poisson distribution, and tested with a large diatom Coscinodiscus wailesii. Agreement appeared to be good up to 60 s1; above this, the maximum response rate of the system became limiting.
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