Aquatic primary production in relation to microalgal responses to changing light: A review |
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| Authors: | J M Ferris R Christian |
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| Institution: | (1) Centre for Water Research, University of Western Australia, 6009 Nedlands, WA, Australia;(2) Environmental Sciences, Murdoch University, 6150 Murdoch, WA, Australia |
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| Abstract: | Dynamic aspects of algal photosynthesis are set against the background of physical water motions which change the light experienced by the phytoplankton. These time-dependent photosynthetic responses are reviewed in relation to the proposition that phytoplankton primary production may be incorrectly estimated by the commonly used  static incubation of light and dark bottles for periods significantly longer than the response-time of phytoplankton to changing light. This proposition is supported by the clear overlap between the timescales which characterize water motions and the timescales reported for the complex responses of algae to changing light. Empirical studies comparing static and dynamic incubations have been inconclusive, as have models incorporating some representation of the dynamic photosynthetic response to changing light. These results reflect weaknesses in the simple formulations used to describe photosynthesis in relation to irradiance, the simplicity of physical schemes used to generate changes in irradiance with time, and a lack of data (field and laboratory) on dynamic responses of microalgae to changing light. The quantitative significance of many physiological mechanisms is not known in relation to their effect on photosynthesis. |
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| Keywords: | Photosynthesis timescales respiration primary production changing light phytoplankton |
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