Modelling nitrogen and phosphorus recovery potential by Ulva fasciata

This study investigated the nitrogen and phosphorus
uptake efficiency and recovery potential by the cosmopolitan macroalga Ulva fasciata. An equation to estimate
biomass production, as well nitrogen and phosphorus recovery, by Ulva species is further proposed.
Results showed that U. fasciata
removed 99 % of nitrogen (NH4-NO3) and 22 % of phosphate
dissolved in water. Tissue nitrogen, phosphorus and chlorophyll-a increased 73, 20 and 244 %,
respectively, demonstrating rapid assimilation of nutrients fueling U. fasciata’s growth (5.69 % day-1).
The constructed equation correlating fresh weight and area showed that 0.21-
and 11.35-tons ha-1 year-1 of phosphorus and nitrogen
could be recovered and that 3.47 tons of dry biomass could be produced. Tissue
data add to the understanding of physiological effects of nutrient availability
in U. fasciata. The efficient removal
of dissolved nitrogen and phosphorus represents an important ecosystem service
with potential for production of value-added by-products.