Figure 3: Amount of the phytoplankton sampling events.
From: Marine phytoplankton community composition data from the Belgian part of the North Sea, 1968–2010
The two periods 1968-1978 (red) and 1994-2010 (blue) are distinguished. a: Amount of sampling events per year from 1968 to 2010. b: Amount of sampling events per season, c: Amount of sampling events per month. Winter=December-February, spring=March-May, summer=June-August, autumn=September-November.
