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The issue of outwelling in the Guadiana River estuary (Portugal): some findings...
Bettencourt, A.M.; Quaresma, L.; Lança, M.J.Abstract The ‘‘Outwelling Theory’’ states that salt marshes play a major role in exporting production to adjacent estuarine and coastal ecosystems. However, it has been found that some marshes act as net importers instead of net exporters of organic matter and nutrients. Once we include mangroves and refine the analysis to comprehend bacterioplankton, organic and stable isotope tracers, the picture became, more...
Avaliação das necessidades em água doce do estuário do Guadiana (Portugal) com ...
Almeida, Pedro R.; Costa, M.J.; Costa, J.L.; Quintella, B.R.; Bettencourt, A.M.The importance of the freshwater inflows to the estuarine and adjoining coastal waters fish communities are put in evidence and a relationship between the commercial fisheries landings and freshwater inflow is presented. For the period between 1988 and 2000, twenty-one different equations were obtained, relating fish catches landed at the Vila Real de Santo António harbor, and the freshwater flow of the River G...
Sediment denitrification in the Mira estuary salt marshes
Lança, M.J.; Bettencourt, A.M.Sediment denitrification is a microbial process that converts dissolved inorganic nitrogen present in sediment porewaters to nitrogen gas, which is lost to the atmosphere. Sediment denitrification was determined as a flux of nitrogen gas from intact sediments incubated in gas-tight chambers. The present technique allows for the direct measurement od denitrification in undisturbed sediment cores under ambient co...
Uncertainties in import/export studies and the outwelling theory. An analysis w...
Bettencourt, A.M.M.; Neves, R.J.J.; Lança, M.J.; Baptista, P.J.; Alves, M.J.According to the “outwelling theory”, salt marshes are net exporters of primary production. This view has been contested, inducing a considerable interest in the subject. Both theses are based on annual budgets of organic matter exchange across salt marsh boundaries. These budgets are a function of integrated fluxes computed from water discharge and concentration of solutes and suspensates. Inaccuracies can fol...
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