Considerable interannual variation exists in the concentration of
chlorophyll ‘a’ recorded during the growing season (Feb–Oct) at each
site (Fig. 8). Chlorophyll ‘a’ concentrations were higher some years at
Loch Ewe (up to 45%) than at Stonehaven. Chlorophyll ‘a’ recorded during
the growing season was less at both sites during 2003, 2004 and
2008