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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Sediment Denitrification and Nutrient Fluxes in the San Jos, Lagoon, a Tropical Lagoon in the Highly Urbanized San Juan Bay Estuary, Puerto Rico
Auteurs :	Hamlet Perez-Villalona, Auteur ; Jeffrey C. Cornwell, Auteur ; Jorge R. Ortiz-Zayas, Auteur ; Elvira Cuevas, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (38(6) NOV 2015)
Article en page(s) :	2259-2278
Résumé :	Direct measurements of net N-2 production, oxygen, and inorganic nutrient fluxes at the sediment-water interface were conducted in the San Jos, Lagoon (SJL), a tropical coastal lagoon located at the San Juan Bay Estuary, Puerto Rico, that is heavily impacted by anthropogenic activities. Sediment of the SJL had high organic matter (average = 16.7 %; SD = 9.0), pore water ammonium (541 mu M +/- 422), and pore water soluble reactive phosphorus (SRP) (57 mu M +/- 48) concentrations. High fluxes of oxygen (-1999 mu mol m(-2) h(-1) +/- 2180) and N-2-N (192 mu mol m(-2) h(-1) +/- 315) fluxes were observed. Similarly, high fluxes of ammonium (770 mu mol m(-2) h(-1) +/- 701) and SRP fluxes (167 mu mol m(-2) h(-1) +/- 138) were measured, with moderate nitrate fluxes (-40 mu mol m(-2) h(-1) +/- 53) mostly directed into the sediment. The dissolved inorganic nitrogen and soluble reactive phosphorus ratio (DIN/SRP) was low relative to the Redfield ratio and suggested that the sediment would support SJL as a nitrogen-limited system. An experiment with higher nitrate concentration resulted in a significant response (p

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