euphausiids made up > 90% of the diel migrant biomass. Multifrequency analysis of backscatter data from an Acoustic Zooplankton Fish Profiler moored from January to September 2014, combined with plankton net data, showed that Thysanoessa spp. We measured C and N active transport due to diel vertical migration (DVM) in a Svalbard fjord at 79°N. Zooplankton vertical migration enhances the efficiency of the ocean biological pump by translocating carbon (C) and nitrogen (N) below the mixed layer through respiration and excretion at depth.
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