Oecologia

, Volume 69, Issue 2, pp 288–295 | Cite as

The analysis of photosynthesis in air and water of Ascophyllum nodosum (L.) Le Jol.

  • Andrew M. Johnston
  • John A. Raven
Original Papers

Summary

The photosynthetic characteristics for the intertidal macroalga Ascophyllum nodosum were examined in air and water. Under ambient conditions of temperature (10° C) inorganic carbon concentrations (15.63 mmol CO2 m-3 or 2.0 mol TIC m-3) and light (500 μmol photons m-2 s-1) photosynthesis was slightly greater by the exposed alga than by the submerged alga. In both environments photosynthesis was light saturated at 200 μmol photons m-2 s-1. The relationship between CO2 concentration and photosynthesis in air could be accurately analysed using Michaelis-Menten kinetics, although the range of concentrations used were not saturating. In contrast the application of the Lineweaver-Burk and Woolf plots to aquatic photosynthesis was not suitable as the experimental data was similar to the Blackman type curves and not rectangular hyperbolae. This was reflected by the applicability of the Hill-Whittingham equation to describe the photosynthesis curves. The effect of unstirred layers and other limiting factors is discussed in relation to the kinetic parameters, Vmax and Km.

Keywords

Photosynthesis Ambient Condition Carbon Concentration Inorganic Carbon Type Curve 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • Andrew M. Johnston
    • 1
  • John A. Raven
    • 1
  1. 1.Department of Biological SciencesDundee UniversityDundeeUK

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