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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Druckformat: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v17.i1.70
pages 82-93

The Combined Influence of Light Intensity and Temperature on Organic Carbon to Chlorophyll α Ratio in Three Species of Marine Bacillariophyta

N.Yu. Shoman
A.O. Kovalevsky Institute of Biology of the Southern Seas, 2, Nakhimov Prosp., Sevastopol 99011, Crimea
A. Akimov
A.O. Kovalevsky Institute of Biology of the Southern Seas, 2, Nakhimov Prosp., Sevastopol 99011, Crimea


The combined effect of light and temperature on change in the intracellular ratio of organic carbon to chlorophyll α (C : chl. α) was studied in three species of diatoms: Phaeodactylum tricornutum Bohlin, Nitzschia sp. 3, and Skeletonema costatum Cleve. At the optimum temperature of 20°C value of the C : chl. α ratio varies from 15 to 60−70 all over the studied light range in Ph. Tricornutum and Nitzschia sp. 3, and up to 350 µE·m−2·s−1 in S. costatum. The dependence of this ratio on light is described by a hyperbolic curve. Temperature decrease results in an increase in the C : chl. α ratio in algal cells and increases the initial tangent of the slope of the C : chl. α ratio curve. Inhibiting light combined with low temperature caused a decrease in the functional activity of algae, a decrease in the rate of synthesis of chl. α against the background of its enhanced photo-oxidation and, as a consequence, a sharp increase of the C : chl. α ratio. All studied diatom species are characterized by similar nature of light and temperature dependence of C: chl. α; however, in S. costatum the curve of C : chl. α ratio formed the plateau at lower light intensities, while photo-oxidation of chlorophyll took place with an increase in luminance.

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