Photosynthesis of Ulva sp. II. utilization of CO2 and HCO-3 when submerged

Beer Sven, Amram Eshel

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The photosynthetic capacity of submerged Ulva sp. when utilizing CO2 and HCO-3 as exogenous carbon forms has been investigated and compared with ambient carbon concentrations in sea water. Saturating concentrations of HCO- 3 and CO2 were 1200 and 100 μM, respectively at saturating light, and photosynthetic rates under such conditions averaged 700 μmol O2·g DW-1 ·h-1. The HCO-3 concentration of sea water (≈2500μM), was thus found to be saturating for photosynthesis of Ulva. At the CO2 concentration of sea water (≈ 10 μM), the contribution of this carbon form to photosynthesis could be 27% at the most. Under conditions of slow water movement, the relative importance of CO2 utilization would probably be minimized in favour of HCO-3 utilization. It is concluded that HCO-3 uptake is not limiting photosynthesis for Ulva under natural conditions.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalJournal of Experimental Marine Biology and Ecology
Issue number1
StatePublished - 6 Jul 1983


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