Relationship of CO2 concentrations to photosynthesis of intertidal macroalgae during emersion

  • Kunshan Gao
  • Yan Ji
  • Yusho Aruga
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 137)


In order to assess the ecological impacts of the atmospheric CO2 increase on the intertidal macroalgae during emersion, the photosynthesis of Enteromorpha linza (a green alga), Ishige okamurae (a brown alga) and Gloiopeltis furcata (a red alga) was investigated in air as a function of CO2 concentrations and water loss. Their photosynthesis was not saturated at the present atmospheric CO2 level (350 μl 1 −1 or 15.6 μM), the CO2 compensation point and K [mCO2] increased with increasing desiccation, showing that desiccation lowers the CO2 affinity of the intertidal macroalgae. It was concluded that E. linza, I. okamurae and G. furcata, while exposed to air, can benefit from atmospheric CO2 rise, especially when the algae have lost some water.

Key words

CO2 emersion macroalgae photosynthesis seaweeds 


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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Kunshan Gao
    • 1
    • 2
  • Yan Ji
    • 1
    • 2
  • Yusho Aruga
    • 3
  1. 1.Marine Biology InstituteShantou UniversityShantou, GuangdongChina
  2. 2.Institute of HydrobiologyThe Chinese Academy of ScienceWuhan, HubeiChina
  3. 3.Tokyo University of FisheriesMinato-ku, TokyoJapan

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