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Oxygen concentrations measured in water, gas-filled lacunae of a root and a leaf, and at 20 mm depth in the sediment of a L. dortmanna population from Skånes Värsjö transferred to the laboratory and exposed to an initial shift from light to darkness, maintained in air-saturated water for 14 h, and finally exposed to deoxygenated water in the dark for an additional 4 h.
