A new bell jar/microelectrode method to measure changing oxygen fluxes in illuminated sediments with a microalgal cover1

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Abstract
Primary production of microalgae is usually measured by subtracting the recorded oxygen release in bell jars over lighted sediments from those over darkened sediments. We show that the oxygen uptake in illuminated sediments is higher than in dark sediments, indicating that past measurements have underestimated production and mineralization rates (for our system by a factor of 1.2–1.3). We introduce a combined bell jar/microelectrode method to measure in situ primary production, mineralization, and apparent diffusion coefficients in sediments with an active population of benthic microalgae.

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