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Diurnal patterns of gas exchange (light-saturated photosynthesis Amax [a–g], respiration [h–n]) and chlorophyll fluorescence (FVFM [o–u]) from seven arctic tundra vascular plants from Toolik Lake Field Station, Alaska measured at three time periods (meltout, peak, fall) in 2010. Filled circles = melt out, filled squares = peak, and filled diamonds = fall period of the growing season. All symbols are means of n = 6 plants (+- 1 SEM); x-axis: diurnal time interval.
