La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The Contribution of Benthic Nutrient Regeneration to Primary Production in a Shallow Eutrophic Estuary, Weeks Bay, Alabama
Auteurs :	Behzad Mortazavi, Auteur ; Ashley A. Riggs, Auteur ; Jane M. Caffrey, Auteur ; Helene Genet, Auteur ; Scott W. Phipps, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (35(3) MAY 2012)
Article en page(s) :	862-877
Résumé :	Benthic oxygen, dinitrogen, and nutrient fluxes (NH (4) (+) , NO (3) (-) , and PO (4) (3-) ) were measured monthly during a 1-year period at two locations in Weeks Bay, a shallow (1.4 m) and eutrophic estuary in Alabama. Gross primary productivity (GPP), ecosystem respiration (R), and net ecosystem metabolism were determined from high-frequency dissolved oxygen measurements. Peak water column NO (3) (-) (55 mu M) and chlorophyll a (138 mu g/l) concentrations were measured during spring and fall, respectively. Sediments were a net source of NH (4) (+) (102 mu mol m(-2) h(-1)) and PO (4) (3-) (0.9 mu mol m(-2) h(-1)) but a sink for NO (3) (-) (-30 mu mol m(-2) h(-1)). Benthic N(2) fluxes indicated net N fixation (12 mu mol N m(-2) h(-1)). Sediment oxygen demand (0.55 g O(2) m(-2) day(-1)) accounted for

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...