Marine Biology

, Volume 45, Issue 4, pp 289–295

Effects of light intensity on photosynthesis and dark respiration in six species of marine phytoplankton

Authors

  • P. G. Falkowski
    • Oceanographic Sciences Division, Department of Applied ScienceBrookhaven National Laboratory
  • T. G. Owens
    • Oceanographic Sciences Division, Department of Applied ScienceBrookhaven National Laboratory
Article

DOI: 10.1007/BF00391815

Cite this article as:
Falkowski, P.G. & Owens, T.G. Mar. Biol. (1978) 45: 289. doi:10.1007/BF00391815

Abstract

Using an oxygen polarographic electrode, the shapes of photosynthetic curves and the effects of light on dark respiration in 6 species of marine phytoplankton wer examined. The species used were Skeletonema costatum, Ditylum brightwellii, Cyclotella nana (Thalassiosira pseudonana) (all Bacillariophyceae), Dunaliella tertiolecta (Chlorophyceae), Isochrysis galbana (Haptophyceae), and Gonyaulax tamarensis (Dinophyceae). A hysteresis was observed in all species examined with respect to increasing and decreasing light. Compensation light intensities varied by over 4 orders of magnitude, suggesting that the 1% light depth is an ambiguous measure of the euphotic zone. The data suggest that dark respiration accounts for ca. 25% of gross photosynthesis, but is species-dependent. In addition, respiration versus cell size does not describe an inverse exponential function over the size scales examined.

Copyright information

© Springer-Verlag 1978