caa a22 4500 44589122X CHVBK 20180317145617.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10750-010-0472-8 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0472-8 Nutrient stoichiometry, freshwater residence time, and nutrient retention in a river-dominated estuary in the Mississippi Delta [Elektronische Daten] [Brian Perez, John Day Jr., Dubravko Justic, Robert Lane, Robert Twilley] A 3-month field study was conducted to examine the effects of Atchafalaya River discharge on nitrogen and phosphorus concentrations in the Fourleague Bay system, to document patterns with salinity variation, to evaluate stoichiometric nutrient ratios of nitrogen and phosphorus in the river and bay, and to examine the relationship between estuarine freshwater residence time and export of total nitrogen (TN) and total phosphorus (TP) to the Gulf of Mexico. During spring peak discharge of the Atchafalaya River, nutrient ratios in lower Fourleague Bay indicate potential phosphorus limitation with an average dissolved inorganic nitrogen (DIN) to dissolved inorganic phosphorus (DIP) ratio of 32:1, primarily a result of high concentrations of nitrogen entering the northern bay from the Atchafalaya River and of fairly stable phosphorus concentrations. Ratios of DIN to phosphorus in the river were much higher (54:1), indicating a significant loss of nitrogen within the Fourleague Bay system. Freshwater residence time averaged approximately 7days during the study and ranged from 2 to 100days. TN export averaged 57% over the study and ranged from less than 3% at long residence times to greater than 80% at short residence times. TN export to the coastal ocean with respect to residence time is considerably less than has been shown in other studies. Nitrate+nitrite export averaged 49% for the 3-month study. Percentages of TP export were greater than TN, averaging 82% for the study period. By examining the Atchafalaya River delta as a natural analog for controlled river diversions, which are currently being used as coastal restoration tools, this study shows that discharging river water into highly productive shallow coastal estuarine and wetland systems can significantly reduce the amount of nitrogen exported to the Gulf of Mexico. Springer Science+Business Media B.V., 2010 Nitrogen nationallicence Phosphorus nationallicence Nutrient uptake nationallicence Nutrient loading nationallicence Redfield ratio nationallicence Residence time nationallicence Atchafalaya River nationallicence Fourleague Bay nationallicence Perez Brian CH2M Hill, 700 Main Street, Suite 400, 70802, Baton Rouge, LA, USA aut Day Jr. John Department of Oceanography and Coastal Sciences, School of the Coast and the Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut Justic Dubravko Department of Oceanography and Coastal Sciences, School of the Coast and the Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut Lane Robert Department of Oceanography and Coastal Sciences, School of the Coast and the Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut Twilley Robert Department of Oceanography and Coastal Sciences, School of the Coast and the Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut Hydrobiologia Springer Netherlands 658/1(2011-01-01), 41-54 0018-8158 658:1<41 2011 658 10750 https://doi.org/10.1007/s10750-010-0472-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0472-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Perez Brian CH2M Hill, 700 Main Street, Suite 400, 70802, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Day Jr John Department of Oceanography and Coastal Sciences, School of the Coast and the Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Justic Dubravko Department of Oceanography and Coastal Sciences, School of the Coast and the Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Lane Robert Department of Oceanography and Coastal Sciences, School of the Coast and the Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Twilley Robert Department of Oceanography and Coastal Sciences, School of the Coast and the Environment, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 658/1(2011-01-01), 41-54 0018-8158 658:1<41 2011 658 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer