Fig. 7. Seasonal variation of integratedmean Chl a of various algal classes in the different subareas (A, average value for the euphotic zone, mgm−3) and the contribution of various algal
classes to total Chl a biomass in the central area (B, relative abundance, %) during the four cruises in 2006–2007. The vertical axis for Chl a concentration is presented as a logarithmic scale.