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ece3525-sup-0001-TableS1.docxWord document346KFigure S1. Example of light-response curve at low photosynthetically active radiation (PAR) displaying the Kok effect. Unshaded points above the bend in the slope extrapolate to RL on the y-axis. Shaded points below the breakpoint decrease at a faster rate and terminate at RD where PAR = 0 μmol/m2 per sec.
ece3525-sup-0002-FigureS1.docxWord document346KFigure S2. Specific leaf area of the three study species grown under treatment conditions (= 8). Values presented are means ± SE; alphabetic notation denotes significance between treatments within a species at < 0.05.
ece3525-sup-0003-FigureS2.docxWord document346KFigure S3. Mass-based rates of photosynthesis, respiration in the light, and carbon gain efficiency of Betula nana (circle), Eriophorum vaginatum (triangle), Rubus chamaemorus (square) plotted against mass-based N, P, and N:P. Values represent means under treatments ± SE.
ece3525-sup-0004-FigureS3.docxWord document346KTable S1. Analysis of variance (ANOVA) results for gas exchange variables, comparing the three study species under all growth conditions. Variables analyzed include area-, mass-, and nitrogen-based photosynthesis (Anet), dark respiration (RD), respiration in the light (RL), degree of respiratory inhibition by light (% IRL), photorespiration (PR), and carbon gain efficiency (CGE). For all variables measured or calculated, = 7–10 for all species treatment combinations. Stars represent significance as follows: *< 0.05, **< 0.01, ***< 0.001.

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