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• W1966468398 abstract "Seasonal changes of trophic status of the Sacca di Goro lagoon (northern Italy) are analysed through time series of oxygen metabolism for two stations in which separate measures of planktonic, macroalgal (Ulva rigida), and benthic exchange are available. These component results and their sums (i.e. total ecosystem metabolism) are compared using conventional analyses and an index obtained from oxygen fluxes (Trophic Oxygen Status Index, TOSI). The TOSI is derived from the Benthic Trophic Status Index (BTSI) proposed earlier by Rizzo et al. [Estuaries 19 (1996) 247] and basically represents the net potential metabolism. The index results from the relationship between net maximum productivity (NP), measured at saturating light, and dark respiration (DR). The index was developed to provide a simple portrayal of oxygen processing over time and space for shallow aquatic systems and has two modes: a categorical classification and a graphical representation. The categorical classification of the index from autotrophy to heterotropy provides a rapid assessment of the potential oxygen balance and thus evidences critical situations in the lagoonal metabolism. In the graphical representation of the TOSI, three pieces of information are given: the categorical TOSI, the magnitude of flux for both NP and DR and the time line of the fluxes. Where flushing is slow, the TOSI reflects dissolved oxygen dynamics since the NP:|DR| ratio clearly correlates with both the maximum oxygen concentration (MOC) and the daily quantity of oxygen remaining in the water column (RO). However, TOSI is less well related to MOC and RO in open systems in which oxygen concentrations are dominated by physical factors. The graphical representation of TOSI seems also suitable to represent the degree of intrasystem disturbance that is related to the excess of primary production and changes in oxygen availability. It can also discriminate among different photoautotrophic conditions, including hyperautotrophy, as an abnormal oxygen production with respect to the biomass build up, and dystrophy, as the subsequent abnormal oxygen deficit which causes prolonged anoxia and the onset of anaerobic metabolism. Overall, the index provides a tool for rapid assessment of system metabolism and potentially its consequences." @default.
• W1966468398 created "2016-06-24" @default.
• W1966468398 creator A5034070940 @default.
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• W1966468398 date "2004-01-01" @default.
• W1966468398 modified "2023-10-01" @default.
• W1966468398 title "Description of trophic status, hyperautotrophy and dystrophy of a coastal lagoon through a potential oxygen production and consumption index—TOSI: Trophic Oxygen Status Index" @default.
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• W1966468398 doi "https://doi.org/10.1016/j.ecolind.2003.11.001" @default.
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