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Article Dans Une Revue Marine Pollution Bulletin Année : 2013

Trends in salinity and inorganic nitrogen compounds in the Berre lagoon (1994-2011) bacterial activities and nitrogen budgets

Imen Zaghmouri
  • Fonction : Auteur
  • PersonId : 937695
MEB
Valerie Michotey
MEB
Sophie Guasco
MEB
Nicole Garcia
Guillaume Bernard
  • Fonction : Auteur
Patricia Bonin
MEB

Résumé

The Berre lagoon receives freshwater from two natural rivers but the implementation of the hydroelectric power plant led to strong changes in the ecosystem structure and functioning. Sediments are important sites for nitrogen cycling because the O2 sharp gradient allows oxic nitrification as well as anoxic denitrification and anammox to operate in close proximity. Seasonal and short-term variations in the coastal nitrogen processes were quantified at two stations: SA1 located in the northern part of the lagoon directly under the inflows of freshwater and SA3 in the southern part of the lagoon influenced mainly by the marine water inflows. Results revealed that most of the nitrate formed by nitrification was denitrified. Total denitrification was the main N2 removal process. The high primary production based on N-NH4 might be explained by mineralization rates, while the primary production based on N-NH3 was not fully explained by nitrification.

Dates et versions

hal-00796981 , version 1 (05-03-2013)

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Citer

Imen Zaghmouri, Valerie Michotey, Sophie Guasco, Patrick Raimbault, Nicole Garcia, et al.. Trends in salinity and inorganic nitrogen compounds in the Berre lagoon (1994-2011) bacterial activities and nitrogen budgets. Marine Pollution Bulletin, 2013, 67, pp.55-65. ⟨10.1016/j.marpolbul.2012.11.046⟩. ⟨hal-00796981⟩
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