Analysis of Production and Biomass Dynamics of Green Alga, Ulva sp., Bed and red alga, Ahnfeltiopsis paradoxa, Bed on Blocks of Breakwater.

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The estimated light-saturated photosynthesis of Ulva sp. and Ahnfeltiopsis paradoxa at 20°C were 5.42 mgO2/g wet mass⋅ h and 0.86 mgO2/g wet mass⋅ h, respectively. The value of the standard enthalpy and the standard entropy of Ulva sp. photosynthesis were estimated to be 260 kJ/mol and 884 J/mol⋅ K, respectively. The value of A. payadoxa were estimated to be 118 kJ/mol and 399 J/mol⋅ K, respectively. Production calculated by the model agreed with observed data at field observation sites (2 m depth) on the blocks of breakwater of Futaba, Fukushima Prefecture. Predicted results of dynamic nature of the production and biomass of the Ulva bed and the Ahnfeltiopsis bed by the model are: the annual productions from April 1995 by the Ulva bed and the Ahnfeltiopsis bed were 5.8 and 1.2 kg/m2⋅ y, respectivery. The result of the computing showed that predicted annual production and average biomass of Ulva bed were influenced by average insolation and average water temperature. On the other hand, average insolation is a significant single factor affecting predicted annual net production and predicted average biomass of Ahnfeltiopsis bed.
日本水産増殖学会の論文