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Zostera noltii. Net photosynthetic rate (μmol O2/m2/s) versus photosynthetic active radiation (PAR; μmol quanta/m2/s) measured following oxygen evolution determined at 20°C in leaf segments of plants exposed at 360 ppm (closed circles) and 700 ppm (open circles). Values are mean ± SD (n = 3–4).
