A5020615112- Marine and coastal ecosystems
- Coastal wetland ecosystem dynamics
- Soil and Water Nutrient Dynamics
- Coastal and Marine Dynamics
- Marine Biology and Ecology Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Oceanographic and Atmospheric Processes
- Marine and fisheries research
- Geology and Paleoclimatology Research
- Soil erosion and sediment transport
- Isotope Analysis in Ecology
- Peatlands and Wetlands Ecology
- Aeolian processes and effects
- Oil Spill Detection and Mitigation
- Geological formations and processes
- Coastal and Marine Management
- Hydrology and Watershed Management Studies
- Environmental Conservation and Management
- Marine Bivalve and Aquaculture Studies
- Marine and coastal plant biology
- Atmospheric and Environmental Gas Dynamics
- Ocean Acidification Effects and Responses
- Land Use and Ecosystem Services
- Tropical and Extratropical Cyclones Research
Louisiana State University
2015-2024
College of Coastal Georgia
2020
Oceanography Society
2016
Dauphin Island Sea Lab
2014
University of North Carolina at Chapel Hill
2014
Rutgers, The State University of New Jersey
2014
University of Washington
2012
Louisiana Universities Marine Consortium
1993-2008
Marine Ecology Research Institute
2008
National Estuarine Research Reserve Association
2007
Abstract The second largest zone of coastal hypoxia (oxygen-depleted waters) in the world is found on northern Gulf Mexico continental shelf adjacent to outflows Mississippi and Atchafalaya Rivers. combination high freshwater discharge, wind mixing, regional circulation, summer warming controls strength stratification that goes through a well-defined seasonal cycle. physical structure water column nutrient loads enhance primary production lead an annual formation hypoxic mass dominant from...
Abstract. Water masses can become undersaturated with oxygen when natural processes alone or in combination anthropogenic produce enough organic carbon that is aerobically decomposed faster than the rate of re-aeration. The dominant usually involved are photosynthetic production and microbial respiration. re-supply indirectly related to its isolation from surface layer. Hypoxic water (<2 mg L−1, approximately 30% saturation) form, therefore, under "natural" conditions, more likely occur...
Rabalais, N. N., Turner, R. E., Díaz, J., and Justić, D. 2009. Global change eutrophication of coastal waters. – ICES Journal Marine Science, 66: 1528–1537.
Journal Article Changes in Mississippi River Water Quality this Century: Implications for coastal food webs Get access R. Eugene Turner, Turner Search other works by author on: Oxford Academic Google Scholar Nancy N. Rabalais BioScience, Volume 41, Issue 3, March 1991, Pages 140–147, https://doi.org/10.2307/1311453 Published: 01 1991
C oastal eutrophication is a major, global environmental problem that tracks increases in population and the concentration of those coastal regions, increased agricultural production adjacent river basins, increasing food energy consumption.Society has altered nitrogen phosphorus cycles availability these two nutrients to marine ecosystems through generation wastewater, application fertilizers, fixation by leguminous crops, atmospheric deposition oxidized from fossil-fuel combustion (Peierls...
Two centuries of land use in the Mississippi River watershed are reflected water quality its streams and continental shelf ecosystem receiving discharge. The most recent influence on nutrient loading—intense widespread farming especially fertilizer use—has had a more significant effect than has drainage or conversion native vegetation to cropland grazing pastures. 200-year record loading offshore is paleoreconstructed plankton dated sediments. This illustrates that development fair,...
A 20+ year data set of the size hypoxic zone off Louisiana−Texas coast is analyzed to reveal insights about what causes variation in summer, accumulation carbon storage sediments, and pelagic sediment oxygen demand. The results models support conclusion that some this can be explained by a higher sedimentary demand, which may larger than water column respiration rates summer. Proxies for organic loading sediments losses continue after accumulation, from other studies indicate demand directly...
More than 131 × 10 6 metric tons (MT) of inorganic sediments accumulated in coastal wetlands when Hurricanes Katrina and Rita crossed the Louisiana coast 2005, plus another 281 MT accumulation was prorated for open water area. The annualized combined amount per hurricane equals (i) 12% Mississippi River's suspended load, (ii) 5.5 times load delivered by overbank flooding before flood protection levees were constructed, (iii) 227 introduced a river diversion built wetland restoration. from...
A U.S. farm policy shift to joint production of commodities and ecological services will advance sustainable agriculture.
A positive relationship is demonstrated for 27 locations between commercial yields of penaeid shrimp per area intertidal vegetation and latitude which can be described by the formula y = 158.7e−0.070(x) where kilograms/hectare x degrees 0 ° 35 °. The latitudinal gradient grossly parallels a heating-degree-days twice slope probable rates litterfall frown estuarine macrophytes. On regional basis, inshore are directly related to whereas they not correlated with area, average depth, or volume...
Abstract One of the largest human‐caused areas bottom‐water oxygen deficiency in coastal ocean is on northern Gulf Mexico continental shelf adjacent to Mississippi River, which discharges nitrogen and phosphorus loads into its surface waters. The beginnings seasonal hypoxia (≤2 mg l −1 dissolved oxygen) this area was 1950s with an acceleration worsening severity during 1970s. Currently, bottom hypoxic can approach 23,000 km 2 , volume, 140 3 . Ecosystems, people, economies are now at risk...
:Coastal wetlands, such as saltmarshes and mangroves, that fringe transitional waters deliver important ecosystem services support human development. Coastal wetlands are complex social-ecological systems occur at all latitudes, from polar regions to the tropics. This overview covers in five continents. The of varying size, catchment population Economic sectors activities around coastal their catchments exert multiple pressures affect state delivery valuable services. All were found be...
Marine diatoms require dissolved silicate to form an external shell, and their growth becomes Si-limited when the atomic ratio of inorganic nitrogen (Si:DIN) approaches 1:1, also known as “Redfield ratio.” Fundamental changes in diatom-to-zooplankton-to-higher trophic level food web should occur this falls below 1:1 proportion phytoplankton community is reduced. We quantitatively substantiate these predictions by using a variety data from Mississippi River continental shelf, system which...