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Contribution of Spartina maritima to the reduction of eutrophication in estuarine systems
Authors:Sousa Ana I  Lillebø Ana I  Caçador Isabel  Pardal Miguel A
Affiliation:a IO - Institute of Oceanography, Faculty of Sciences, University of Lisbon, Campo Grande, 1749-016 Lisbon, Portugal
b IMAR - Institute of Marine Research, Department of Zoology, University of Coimbra, 3004-517 Coimbra, Portugal
c CESAM - Centro de Estudos do Ambiente e do Mar, Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
Abstract:Salt marshes are among the most productive ecosystems in the world, performing important ecosystem functions, particularly nutrient recycling. In this study, a comparison is made between Mondego and Tagus estuaries in relation to the role of Spartina maritima in nitrogen retention capacity and cycling. Two mono-specific S. maritima stands per estuary were studied during 1 yr (biomass, nitrogen (N) pools, litter production, decomposition rates). Results showed that the oldest Tagus salt marsh population presented higher annual belowground biomass and N productions, and a slower decomposition rate for litter, contributing to the higher N accumulation in the sediment, whereas S. maritima younger marshes had higher aboveground biomass production. Detritus moved by tides represented a huge amount of aboveground production, probably significant when considering the N balance of these salt marshes. Results reinforce the functions of salt marshes as contributing to a reduction of eutrophication in transitional waters, namely through sedimentation processes.
Keywords:Spartina maritima   Nitrogen   Salt marsh   Bioremediation   Eutrophication
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