Dynamic behaviour of photosynthesis-irradiance curves determined from oxygen production during variable incubation periods

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Abstract

Production and consumption of oxygen were analysed in phytoplankton populations using a fast biomass-concentration technique. The variation of productivity with irradiance was studied using different incubation periods, from minutes to hours. The influence of the exposure time on the photosynthesis-irradiance {P/I) curve parameters was analysed. The results show that dissolved oxygen concentration in the water does not increase linearly with time and that P(max)/(B) (maximum biomass-specific production rate and I(opt) (optimal light intensity) are time-dependent. Exponential and linear expressions were proposed to describe P(max)/(B) and I(opt) as a function of time. A model was built to investigate the importance of static (steady-state) vs dynamic (time-dependent) simulation in the prediction of phytoplankton production under different light intensities. The results show the importance of using dynamic expressions for the P/I relationship, especially in a mixed water column.

Original languageEnglish
Pages (from-to)31-43
Number of pages13
JournalMarine Ecology Progress Series
Volume165
DOIs
Publication statusPublished - 7 May 1998

Keywords

  • Biomass concentration Phytoplankton productivity
  • Oxygen method Ecological model
  • Short incubation periods

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