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PSII photosynthetic yield in Synechococcus isolates BL107 (clade IV) and WH8102 (clade III) at 18 °C and 22 °C. The x axis represents growth period in hours and the y axis represents mean quantum yield (Fv/Fm). Dashed lines represent growth at 18 °C and solid lines represent growth at 22 °C. Arrows indicate time of serial transfers.
