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The gas filled lacunae of seagrasses receive some of the oxygen produced in photosynthesis. When the lacunar system is tapped a stream of gas is released; its flow rate is easily measured under both laboratory and field conditions. At a series of net photosynthetic rates from zero to maximum, there is a linear, zero-intercept calibration regression between volumetric gas stream observations with simultaneous oxygen production measurements. With this species-specific calibration factor all that is required to make accurate and sensitive measurements of photosynthetic rates is a graduated plpette, a razor blade and a small plece of rubber tubing

Lacunar gas discharge as a measure of photosynthesis in seagrasses