Report on Harmonisation of freshwater biological methods

MACROPHYTES16. The aquatic Macrophytes are widely used in the biological monitoring systems ofthe AT, BA and CE GIGs and less in all other GIGs (Fig. 16).Angiosperms per GIG%80706050403020100Al AT BA CE ME NOFigure 16. Percentage sampling Macrophytes in the GIGs.17. Sampling occurs mostly between 2 and 6 times per year, in some GIGs a smallernumber of lakes are sampled from 7 to 12 times per year (in the AT, BA, CE and NOGIGs) (Fig. 17), all during the summer or vegetation period (Fig. 18).Sampling frequencyNOMECEBAATAL12-67-12+120 20 40 60 80 100Figure 17. Macrophytes sampling frequency in the GIGs.%57