Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5316
Title: Modelling nutrient mass balance in a temperate meso-tidal estuary: Implications for management
Authors: Neto, João Magalhães 
Flindt, Mogens René 
Marques, João Carlos 
Pardal, Miguel Ângelo 
Keywords: management; nutrient loading; transport; ecological modelling; mass balance; residence time
Issue Date: 2008
Citation: Estuarine, Coastal and Shelf Science. 76:1 (2008) 175-185
Abstract: Although mitigation programmes have been implemented in huge eutrophied estuarine systems, satisfactory results are not always immediately achieved. External loadings are reduced but the nutrient pools still existing in the sediments (due to decades of external supply) start to deplete only slowly, to reach the lower steady state level related to the new external loading. In the Mondego Estuary, this situation could be seen from the mass balance calculations including different nutrient fractions (dissolved, SPM and bound in vegetation). Different nutrient fractions quantified over the year showed the retention capacity and supplying capacity of these estuarine systems, and also the seasonal dynamics those fractions can present. External loading of nitrogen was largely dominated by DIN, but after its incorporation by benthic primary producers nitrogen export occurred essentially as SPM-N. Phosphorus loading was dominated by SPM-P, but during warmer periods P-efflux increased DIP concentration inside the system and was afterwards exported through the outer boundary. Although nutrients bound in vegetation were not significant to total mass balance, depending on the occurrence of occasional macroalgal blooms, the vegetation fraction can significantly increase its contribution to the overall balance.
URI: http://hdl.handle.net/10316/5316
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

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