The 4.5-year long chlorophyll a time series of the coastal station shows a clear seasonal signal at 0 m ( Fig. 9) which is confirmed by the wavelet analysis ( Fig. 6). It also indicates a stronger signal in 1981 as for the mesozooplankton dry weight (see Section 4.5.). Maximum concentrations (0.6 μg L−1) occur between mid May and mid-July ( Fig. 10) and the minimum occur in spring (October) and early fall (March).