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Publication Type J
Authors Johnson, J. M., J. S. Choinski, J. A. Heyes and S. O. Bandeira
Title Factors Affecting Photosynthesis in the Mozambican Seagrasses Cymodocea-Serrulata and Thalassodendron-Ciliatum
Source Photosynthetica
Abstract The effect of various environmental factors on net photosynthesis rates (P(N)) of the differentially depth distributed Mozambican seagrasses, Cymodocea serrulata (R.Br.) Aschers and Magnus (Zannich), and Thalassodendron ciliatum (Forsk.) den Hartog, was examined. At saturating irradiances the deeper water species, T ciliatum, showed a maximum P(N) (as measured by short term O2 evolution) of 12.67 +/- 3.33 mmol(O2) kg-1(Chl) s-1 with added 40 mM NaHCO3 (0.89 mM dissolved CO2 at pH 8); the shallower species, C. serrulata, showed maximum rates of 21.67 +/- 4.17 (10 mM NaHCO3; 0.26 mM dissolved CO2). Saturating irradiances were similar for both species. P(N) estimated by the lacunal gas discharge technique was 16.00 +/- 5.00 mmol(O2) kg-1(Chl) s-1 for C. serrulata and 11.67 +/- 6.67 for T. ciliatum. P(N) of both species was reduced by increased water depth, and the pattern of the effect of depth was similar.
Year Published 1993
Volume 28
Issue 2
Beginning Page 307-312
Unique Article Identifier ISI:A1993LW59100016
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