Changes in stoichiometric Si, N and P ratios of Mississippi River water diverted through coastal wetlands to the Gulf of Mexico

Lane, Robert R.; Day, John W.; Justić, Dubravko; Reyes, Enrique; Marx, Brian D.; Day, John; Hyfield, Emily

doi:10.1016/j.ecss.2003.11.015

Cited by 87 publications

(55 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Coastal wetlands clearly benefit from sediment renewal associated with ongoing and proposed river diversions, but the nutrient dynamics in these wetlands are complex. Under some conditions, there is a significant reduction of nutrients [Lane et al, 2004], but under other conditions this is not the case. In addition, at least three large Louisiana bay systems (Barataria, Terrebonne, and Atchafalaya) can affect hypoxia by supplying significant quantities of organic matter to the coast [Morton et al, 2006].…”

Section: Future Directionsmentioning

confidence: 87%

New Approaches to the Gulf Hypoxia Problem

et al. 2010

Self Cite

View full text Add to dashboard Cite

Coastal water hypoxia, where dissolved oxygen is less than 2 milligrams per liter, is a global environmental problem [e.g., Diaz and Rosenberg, 2008]. It is largely associated with eutrophication, whereby nutrient inputs (nitrogen and phosphorous) to coastal waters lead to elevated primary production and accelerated rates of microbial respiration, which results in oxygen depletion. Despite more than 25 years of monitoring [Rabalais et al., 2007] (see also Figure S1 in the online supplement to this Eos issue (http://www.agu.org/eos_elec/)), the relative importance of the various processes that control hypoxia in bottom waters of the northern Gulf of Mexico (GOM)–in particular, those beyond the direct influence of river plumes [Dagg et al., 2007; Bianchi et al., 2008, 2010, and references therein]—remains uncertain. For example, a prediction last June pronounced that the 2009 hypoxic area would be the largest on record (∼23,000 square kilo meters; see http://www.gulfhypoxia.net/Research/Shelfwide%20Cruises/2009/ Files/2009

show abstract

Section: Future Directionsmentioning

confidence: 87%

New Approaches to the Gulf Hypoxia Problem

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…Coastal wetlands clearly benefi t from sediment renewal associated with ongoing and proposed river diversions, but the nutrient dynamics in these wetlands are complex. Under some conditions, there is a signifi cant reduction of nutrients [Lane et al, 2004], but under other conditions this is not the case. In addition, at least three large Louisiana bay systems (Barataria, Terrebonne, and Atchafalaya) can affect hypoxia by supplying signifi cant quantities of organic matter to the coast [Morton et al, 2006].…”

Section: Future Directionsmentioning

confidence: 91%

Eos, Transactions, American Geophysical Union Volume 91, Number 19, 11 May 2010

2010

EoS Transactions

View full text Add to dashboard Cite

“…In a review of surface water chemistry of freshwater forested wetlands, Hunter et al [44] reported that TN concentrations ranged 0.11-3.09 mg/L and TP concentrations ranged 0.2-1.0 mg/L. In coastal marsh/estuarine systems, TN concentration generally range 0.5-5 mg/L and TP concentrations range 0.02-0.30 mg/L [45][46][47][48][49][50].…”

Section: Current State Of the Cwumentioning

confidence: 99%

Restoration and Management of a Degraded Baldcypress Swamp and Freshwater Marsh in Coastal Louisiana

Hunter¹,

Day

Shaffer

et al. 2016

Water

View full text Add to dashboard Cite

Abstract:The Central Wetlands Unit (CWU), covering 12,000 hectares in St. Bernard and Orleans Parishes, Louisiana, was once a healthy baldcypress-water tupelo swamp and fresh and low salinity marsh before construction of levees isolated the region from Mississippi River floodwaters. Construction of the Mississippi River Gulf Outlet (MRGO), which funneled saltwater inland from the Gulf of Mexico, resulted in a drastic ecosystem change and caused mortality of almost all trees and low salinity marsh, but closure of the MRGO has led to decreases in soil and surface water salinity. Currently, the area is open water, brackish marsh, and remnant baldcypress stands. We measured hydrology, soils, water and sediment chemistry, vegetation composition and productivity, accretion, and soil strength to determine relative health of the wetlands. Vegetation species richness is low and above-and belowground biomass is up to 50% lower than a healthy marsh. Soil strength and bulk density are low over much of the area. A baldcypress wetland remains near a stormwater pumping station that also has received treated municipal effluent for about four decades. Based on the current health of the CWU, three restoration approaches are recommended, including: (1) mineral sediment input to increase elevation and soil strength; (2) nutrient-rich fresh water to increase productivity and buffer salinity; and (3) planting of freshwater forests, along with fresh and low salinity herbaceous vegetation.

show abstract

Changes in stoichiometric Si, N and P ratios of Mississippi River water diverted through coastal wetlands to the Gulf of Mexico

Cited by 87 publications

References 34 publications

New Approaches to the Gulf Hypoxia Problem

New Approaches to the Gulf Hypoxia Problem

Eos, Transactions, American Geophysical Union Volume 91, Number 19, 11 May 2010

Restoration and Management of a Degraded Baldcypress Swamp and Freshwater Marsh in Coastal Louisiana

Contact Info

Product

Resources

About