160">Phytoplankton was addressed by flow cytometry along an inshore–offshore transect.
Thirteen periods were considered during the winter–spring–summer transition in 2012.
Picoeukaryotes, Synechococcus spp. and Phaeocystis globosa were the most abundant.
Some phytoplankton groups showed inshore–offshore abundance gradients.
Seasonal variability accounted for most of the changes in phytoplankton abundance.