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The induction of in vivo chlorophyll a fluorescence (increase in fluorescence intensity during a time-scale of ms) was tested as a measure of photosynthetic capacity of phytoplankton in the Sargasso Sea and at 2 stations, spatially and temporally distinct, on the Grand Banks of Newfoundland. The chlorophyll a-normalized area above the fluorescence induction curve, measured in the presence of the inhibitor DCMU (A,, [Chl a]' ) , is assumed to be proportional to the pool-size of Q, the primary electron acceptor of photosystem 11. Positive correlations were found between ADCMU (Chl a)-' and the maximum rate of photosynthesis at light saturation at the 3 sampling locations. However, the slopes of the regressions differed among locations, suggesting that a unique relation is not possible for phytoplankton communities composed of different species and/or physiological states. Consideration of the turnover time of Q, in addition to its pool-size, may be necessary to interpret fluorescence induction completely in terms of photosynthetic capacity. Nevertheless, ADCMU (Chl a)-' provided a rapid way to obtain information about the depth distribution of relative photosynthetic activity, and about possible mechanisms of photoadaptation; values of ADC," (Chl a)-' generally increased during a 10 or 24 h incubation period at high irradiance levels, and decreased at low irradiance levels.

Fluorescence induction of chlorophyll a in the Sargasso Sea and on the Grand Banks: correlation with photosynthetic capacity