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SENSITIVITY ANALYSES OF POPULATION BIOMASS DYNAMICS FOR ULVA SPP. AND SARGASSUM FURCATUM AT THE CABO FRIO UPWELLING REGION OF BRAZIL

2008; World Scientific; Volume: 16; Issue: 04 Linguagem: Inglês

10.1142/s0218339008002629

1793-6470

Mariana Alves de Guimaraens, José Eduardo Arruda Gonçalves, Sergio O. Lourenço, Ricardo Coutinho,

Marine Biology and Ecology Research

Sargassum furcatum population dynamics was studied at Cabo Frio Island, where generally the effect of upwelling waters is sporadic and occurs mainly during the summer months at Farol Beach. Model sensitivity analyses were compared for Sargassum simulations at Cabo Frio Island and for Ulva dynamics simulated with data sets collected at two other upwelling sites, Sonar and Jaconé. Field data suggests that Sargassum growth shows a delay to nutrient enrichment events, whereas Ulva growth follows nutrient peaks more closely. Algal biomass was simulated with parameter values changed plus and minus 10%, one at a time, while holding all other parameters constant. Those parameters that cause, a plus or minus change of greater than 10% in the model output, were used in the next stage of the sensitivity analyses. In the second stage, a fractional factorial design was used to evaluate the main effect of a particular parameter. The parameter literature survey and sensitivity analyses, for both Sargassum and Ulva models, suggest that parameters related to environmental factors, such as minimal cellular nutrient quota for growth- and temperature-related growth functions, should be further investigated for algae at the Cabo Frio upwelling region, since they caused a change in the biomass output greater than 10%.