Copepods were collected with two replicate vertical hauls. The 90-μm mesh size WP-2 plankton net was pulled from a depth of 30 m to the surface at approximately 0.5 m s−1 and rinsed from the outside to concentrate the catch in the cod end. The concentrated samples were transferred to plastic jars and preserved in 4% formaldehyde buffered with sodium borate (borax). Analysis was carried out by the National Marine Fisheries Research Institute, Gdynia, Poland. Subsamples were counted until at least 100 individuals of each of the two to three most abundant taxa had been counted. Each copepod was staged according to nauplii; C1, C2, C3, C4, and C5 (copepodite stages 1 to 5); adult male; or adult female. The prosome length was obtained for 10 individuals of each stage unless there were less than 10 individuals in the subsample, in which case all individuals were measured. Biomass was calculated using length weight regressions compiled by Bjærke and colleagues (5). Raw data from zooplankton analysis are provided in data file S1.

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