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Linking lower and higher trophic levels requires special focus on theessential role played by mid-trophic levels, i.e., the zooplankton. One ofthe most relevant pieces of information regarding zooplankton in terms of flux ofenergy lies in its size structure. In this study, an extensive data set ofsize measurements is presented, covering parts of the western Europeancontinental shelf and slope, from the Galician coast to the Ushant front,during the springs from 2005 to 2012. Zooplankton size spectra were estimatedusing measurements carried out in situ with the Laser Optical PlanktonCounter (LOPC) and with an image analysis of WP2 net samples(200 μm mesh size) performed following the ZooScan methodology. TheLOPC counts and sizes particles within 100–2000 μm of sphericalequivalent diameter (ESD), whereas the WP2/ZooScan allows for counting, sizingand identification of zooplankton from ~ 400 μm ESD. Thedifference between the LOPC (all particles) and the WP2/ZooScan (zooplanktononly) was assumed to provide the size distribution of non-living particles,whose descriptors were related to a set of explanatory variables (includingphysical, biological and geographic descriptors). A statistical correctionbased on these explanatory variables was further applied to the LOPC sizedistribution in order to remove the non-living particles part, and thereforeestimate the size distribution of zooplankton. This extensive data setprovides relevant information about the zooplankton size distributionvariability, productivity and trophic transfer efficiency in the pelagicecosystem of the Bay of Biscay at a regional and interannual scale

Springtime zooplankton size structure over the continental shelf of the Bay of Biscay