Figure 1

Map of sampling stations and salinity. Map of the 19 sampling stations distributed in the Gulf of Bothnia (GB, triangle), Baltic Proper (BP, circles) and the Skagerrak-Kattegat (SK, squares). Colour of the points is scaled by station-level mean salinity. Inset shows the distribution of all monthly salinity measurements (0–10 m depth) from stations in the three regions. The map was created using R22.