86 88 90 92 94 96 98 00 Figure 9.8. Growth rate ofphytoplankton in the tidal-freshwater Hudson. The solid circles labeled "actual" show the growth rate calculated from GPP (Fig. 9.7) and biomass. The thin line shows the growth rate at optimum light ("potential"), with no light limitation. In this scenario the light level was 1000 |i Einst. m-2 s-1 throughout the water column for 12 h each day.

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