Effect of small variations in salinity on the rates of photosynthesis and respiration of the zooxanthellate coral Stylophora pistillata

  • Ferrier-Pagès C
  • Gattuso J
  • Jaubert J
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Abstract

ABSTRACT: This paper deals with the effect of a long term (3 wk) change in salinity (increase or decrease of 2 to 4 psu) on the rates of photosynthesis and respiration of the zooxan- thellate coral Stylophora pistillata. Colonies were exposed to 4 levels of salinity (34, 36, 38 and 40 psu, with 38 psu as the control salinity) and results were compared using l-factor ANOVAs. Salinity had a significant effect on the protein con- centration. It was 30 % higher at 38 psu than at the other salin- ities. It had also a significant effect on the rates of photosyn- thesis, respiration and on the P,:R ratio. Gross maximal photosynthetic rates were 50% lower at 34, 36 and 40 psu than at 38 psu. The P,:R ratio was always higher at the control salinity. Most of the colonies maintained at 40 psu died, and this was explained by a very low P,:R ratio (

Author-supplied keywords

  • Coral
  • Photosynthesis
  • Respiration
  • Salinity
  • Scleractinian

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