Eutrophication is a major concern in response to anthropogenic nutrient loading of shallow coastal systems worldwide. Effects of this enrichment are easy detectable as abundant primary production of both phytoplankton and macrolgae. Changes in water quality following eutrophication can have significant economic and social impacts. S’Ena Arrubia Lagoon (centre-western Sardinia) is one of few Sardinian lagoons for which pluriennial data concerning main nutrients and phytoplankton are available. This lagoon, which is a residual of a larger lagoon reclaimed during Thirties for agricoltural purpose, is characterised by low depth (about 40 cm) and small size (120 ha) and receives fresh waters mainly from reclaimed lands trought a pump system. S’Ena Arrubia Lagoon is eutrophic as a consequence of intense agricoltural and zootechnical uses of its watershed. High trophic conditions occur as extended phytoplankton blooms, recurrent macroalgae blooms and dystrophic crises, which sometimes cause some fish kills. A pluriennial observation of nutrients and phytoplankton dynamics showed the extreme sensitivity of this lagoon to meteoclimatic variations and other factors, such as sea exchanges and nutrient input through the pump system. The sea-mouth was widened and a new bordigue was built in order to mitigate its high trophy and improving its hydrodynamics. The aim of this study is to assess the impact of this re-framing on primary producers and nutrients in the lagoon. MDS and LOICZ model analysed data prior to (1990-2000) and following (2000-2002) the modification. In particular, shortening in residence time by model application in 1994-1995 ( between 3 and 229 days) and 2001-2002 ( between 1 and 8 days) was observed.

S’Ena Arrubia lagoon (centre-western Sardinia): response of primary producers to nutrients in relation to watershed influence and management / Trebini, Felicina; Padedda, Bachisio Mario; Ceccherelli, Giulia; Antonella, Luglié; Sechi, Nicola. - (2003). (Intervento presentato al convegno International Conference on Southern European Coastal Lagoons: The Influence of River Basin-Coastal tenutosi a Ferrara (Italy) nel 10-12 November 2003).

S’Ena Arrubia lagoon (centre-western Sardinia): response of primary producers to nutrients in relation to watershed influence and management

Bachisio Mario Padedda;Giulia Ceccherelli;Antonella Luglié;Nicola Sechi
2003-01-01

Abstract

Eutrophication is a major concern in response to anthropogenic nutrient loading of shallow coastal systems worldwide. Effects of this enrichment are easy detectable as abundant primary production of both phytoplankton and macrolgae. Changes in water quality following eutrophication can have significant economic and social impacts. S’Ena Arrubia Lagoon (centre-western Sardinia) is one of few Sardinian lagoons for which pluriennial data concerning main nutrients and phytoplankton are available. This lagoon, which is a residual of a larger lagoon reclaimed during Thirties for agricoltural purpose, is characterised by low depth (about 40 cm) and small size (120 ha) and receives fresh waters mainly from reclaimed lands trought a pump system. S’Ena Arrubia Lagoon is eutrophic as a consequence of intense agricoltural and zootechnical uses of its watershed. High trophic conditions occur as extended phytoplankton blooms, recurrent macroalgae blooms and dystrophic crises, which sometimes cause some fish kills. A pluriennial observation of nutrients and phytoplankton dynamics showed the extreme sensitivity of this lagoon to meteoclimatic variations and other factors, such as sea exchanges and nutrient input through the pump system. The sea-mouth was widened and a new bordigue was built in order to mitigate its high trophy and improving its hydrodynamics. The aim of this study is to assess the impact of this re-framing on primary producers and nutrients in the lagoon. MDS and LOICZ model analysed data prior to (1990-2000) and following (2000-2002) the modification. In particular, shortening in residence time by model application in 1994-1995 ( between 3 and 229 days) and 2001-2002 ( between 1 and 8 days) was observed.
2003
S’Ena Arrubia lagoon (centre-western Sardinia): response of primary producers to nutrients in relation to watershed influence and management / Trebini, Felicina; Padedda, Bachisio Mario; Ceccherelli, Giulia; Antonella, Luglié; Sechi, Nicola. - (2003). (Intervento presentato al convegno International Conference on Southern European Coastal Lagoons: The Influence of River Basin-Coastal tenutosi a Ferrara (Italy) nel 10-12 November 2003).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/74621
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