New plankton imaging did not reproduce the old recorder’s numbers—and that is the point
WHAT THE EVIDENCE SAYS
The Pi-10 produced mean copepod abundances roughly 36 times higher than the Continuous Plankton Recorder and the datasets were not significantly correlated. The CPR better resolved taxonomic and latitudinal community structure, while imaging captured finer-scale abundance and size variation.
WHY IT MATTERS / OUR READ
Modern sensors can add information without being interchangeable with legacy monitoring. Overlapping deployments are essential when new technology could otherwise create a false ecological trend at the moment the instrument changes.
CAVEATS / UNCERTAINTY
The comparison covered two transects and device-specific catchability strongly shapes abundance. The imaging classifier exceeded 90% accuracy but still carries classification error, and biomass estimates rely on generalized allometry.
SOURCE
ICES Journal of Marine Science
View original evidence ↗
On two North Sea transects, a high-resolution Plankton Imager counted far more copepods than the Continuous Plankton Recorder while the two methods captured different spatial signals.
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