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Links with End-Users and Use of Indices

Both in Italy and in France we have worked in close co-operation with potential end-users, viz. the Amministrazione Provenciale di Ferrara and the Conseil Général du Département de la Gironde, respectively. Therefore, we have developed methods to use as indices for determining the susceptibility of lagoons to oxygen deficiency and dystrophic crises. A classification system based on a combination of different variables measured during the growth and decay phases of the dominant primary producers, i.e., net maximum community productivity (NP), dark respiration (DR) of oxygen, sediment oxygen demand (SOD), dark sulphide release from sediments (DSR), sediment acid volatile sulphide (AVS) and reducible iron. The classification based on NP, DR and DSR only provides coarse information but enables a rapid assessment of the balance of community oxygen metabolism and the intensity of disturbance and/or resistance against dystrophy. The classification based on SOD/SRR and AVS/Fe gives more sensitive information on sediment buffering capacities, but is biased by the large spatial heterogeneity of the individual variables (Viaroli et al.). Also a simple measurement of nitrogen fixation in the seagrass fields allows to asses the impact of nitrogen loadings.

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Université Bordeaux 1
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