2 research outputs found
A methodology for parameter estimation in seaweed productivity modelling
This paper presents a combined approach for parameter estimation in models of primary production.
The focus is on gross primary production and nutrient assimilation by seaweeds.
A database of productivity determinations, biomass and mortality measurements and nutrient uptake
rates obtained over one year for Gelidium sesquipedale in the Atlantic Ocean off Portugal has been used.
Annual productivity was estimated by harvesting methods, and empirical relationships using mortality/
wave energy and respiration rates have been derived to correct for losses and to convert the estimates
to gross production.
In situ determinations of productivity have been combined with data on the light climate (radiation
periods, intensity, mean turbidity) to give daily and annual productivity estimates. The theoretical nutrient
uptake calculated using a 'Redfield ratio' approach and determinations of in situ N and P consumption
by the algae during incubation periods have also been compared.
The results of the biomass difference and incubation approaches are discussed in order to assess the
utility of coefficients determined in situ for parameter estimation in seaweed production models