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Projects

Modeling Impacts of Hypoxia in the Northern Gulf o...

We are determining the effects of hypoxia (low dissolved oxygen) on reproduction of fish (Atlantic croaker) throughout the northern Gulf of Mexico to accurately model population outcomes and to assess ...
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Operational Gulf of Mexico Hypoxia Monitoring

The Gulf of Mexico hypoxia monitoring cruise is an annual shelf-wide survey of the Gulf's hypoxic area (i.e., “dead zone”) and the survey is the metric used by the interagency ...
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Transitioning to Operations NOAA Supported Statist...

The Harmful Algal Bloom and Hypoxia Research and Control Act (HABHRCA) mandates the development of scientific tools for natural resource managers to address hypoxia in coastal ecosystems. In response, NCCOS ...
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Understanding Coral Ecosystem Connectivity in the ...

We are investigating population connectivity for key coral, sponge, and fish species between shallow and mesophotic reefs of the Flower Garden Banks National Marine Sanctuary and its proposed expansion areas ...
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News

Testing the Feasibility of Robotic Gliders to Moni...

NCCOS has evaluated the use of underwater gliders to improve Gulf of Mexico hypoxic zone, also known as the dead zone, monitoring. This effort resulted in the development of a ...
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Large ‘Dead Zone’ Measured in Gulf of Mexico

Dr. Nancy Rabalais (at left) and crew, aboard R/V Pelican, prepare to deploy a conductivity, temperature, and depth (CTD) carousel (rosette) containing an array of Niskin water sampling bottles. The ...
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Impacts and Solutions to Gulf of Mexico Hypoxia Hi...

Shrimp boat underway in the Gulf of Mexico. Hypoxia is impacting commercial shrimp fishing. Credit NOAA Photo Library. With a record setting dead zone predicted this summer, Illinois Public Media ...
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NCCOS Assists Response to Cyanobacterial Blooms in...

NOAA's National Centers for Coastal Ocean Science provided a HAB Event Response award of $12,900 to the Louisiana State University (LSU) and the Pontchartrain Conservancy (formally Lake Pontchartrain Basin Foundation).  ...
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NOAA Forecasts Very Large ‘Dead Zone’ for Gulf of ...

NCCOS scientists are forecasting this summer’s Gulf of Mexico hypoxic zone or "dead zone"—an area of low to no oxygen that can kill fish and other marine life—will be approximately ...
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Scientists Use New Technique to Measure Size of Gu...

Every summer, the largest hypoxic zone in the U.S. forms in the northern Gulf of Mexico, resulting in widespread ecosystem and economic impacts. Determining, and then mitigating the size of ...
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NCCOS and NGI Lead Seventh Annual Hypoxia Research...

NCCOS is working with the Northern Gulf Institute (NGI) and Gulf of Mexico State partners to develop a robust and sustainable Gulf of Mexico-wide monitoring program for hypoxia. At the ...
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NCCOS Helps Bridge Divide Between Science and Mana...

A shoreline hardened with riprap (rubble). Credit: Smithsonian Environmental Research Center. Scientists want their research to be helpful to managers and policymakers. However, this wish does not always translate to ...
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Modeling Coastal Hypoxia: NCCOS Sponsored Research...

A new book highlights NCCOS sponsored hypoxia modeling. It contains original research on numerical simulations of the patterns, controls, and effects of dissolved oxygen dynamics. The book, Modeling Coastal Hypoxia, ...
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Study Provides Nutrient Reduction Targets to Reach...

The Mississippi River/Gulf of Mexico Hypoxia Task Force (HTF) has made major strides in reducing point source nutrient pollution in the Gulf of Mexico watershed, and had some success in mitigating nonpoint ...
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Maps, Tools & Applications

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Data & Publications

Eutrophication-induced acidification of coastal waters in the northern Gulf of Mexico: Insights into origin and processes from a coupled physicalbiogeochemical model

Nutrient inputs from the Mississippi/Atchafalaya River system into the northern Gulf of Mexico promote high phytoplankton production and lead to high respiration rates. Respiration coupled with water column stratification results in seasonal summer hypoxia in bottom waters on the shelf ...
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Evidence of climate-driven ecosystem reorganization in the Gulf of Mexico

The Gulf of Mexico is one of the most ecologically and economically valuable marine ecosystems in the world and is affected by a variety of natural and anthropogenic phenomena including climate, hurricanes, coastal development, agricultural runoff, oil spills, and fishing ...
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Exploring estuarine eutrophication sensitivity to nutrient loading

The sensitivity of surface chlorophyll (Chl) and bottom water dissolved oxygen (DO) to total nitrogen (TN) load was investigated using a Bayesian?based process model fit to data from a range of estuaries. The model was used to test if the ...
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Extensive reproductive disruption, ovarian masculinization and aromatase suppression in Atlantic croaker in the northern Gulf of Mexico hypoxic zone

The long-term impacts on marine ecosystems of the recent dramatic worldwide increase in the incidence of coastal hypoxia are unknown. Here, we show widespread reproductive disruption in Atlantic croakers collected from hypoxic sites approximately 120 km apart in the extensive ...
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Historical trends of hypoxia in Changjiang River estuary: Applications of chemical biomarkers and microfossils

Over the past two decades China has become the largest global consumer of fertilizers, which has enhanced river nutrient fluxes and caused eutrophication and hypoxia in the Yangtze (Changjiang) large river delta-front estuary (LDE). In this study, we utilized plant ...
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Hypoxia-driven changes in the behavior and spatial distribution of pelagic fish and mesozooplankton in the northern Gulf of Mexico

Hypoxia (< 2 mg O2 l? 1) is a major global water quality and fisheries management issue in coastal ecosystems. Although the impact of hypoxia on benthic communities has been intensively studied, less is known about hypoxia's effect on pelagic ...
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Interannual Variation in Stratification over the Texas–Louisiana Continental Shelf and Effects on Seasonal Hypoxia

A numerical dye is used to track freshwater released in May and June from the Mississippi and Atchafalaya rivers using a hydrodynamic model. These months are chosen because discharge and nutrient load in May and June is significantly correlated with ...
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Linking molecular microbial ecology to geochemistry in a coastal hypoxic zone

Multiple environmental mechanisms have been proposed to control bottom water hypoxia (<2 mg O2 L?1) in the northern Gulf of Mexico Louisiana shelf. Near-bottom hypoxia has been attributed to a direct consumption of oxygen through benthic microbial respiration and a ...
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Long-term monitoring of ecological conditions in Gray's Reef National Marine Sanctuary: Comparison of soft-bottom benthic assemblages and contaminant levels in sediments and biota in spring 2000 and 2005

As part of an ongoing program of benthic sampling and related assessments of sediment quality at Gray's Reef National Marine Sanctuary (GRNMS) off the coast of Georgia, a survey of soft-bottom benthic habitats was conducted in spring 2005 to characterize ...
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Macrobenthos and megabenthos responses to long-term, large-scale hypoxia on the Louisiana continental shelf

The macrobenthos and megabenthos responses to long-term, recurring hypoxia on the Louisiana continental shelf were compared at four locations with different historical (2000–2010) episodes of annual exposure to bottom-water hypoxia. Measurements of abundance, biomass, species diversity, and community composition of ...
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General Pages

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NOAA Internship Opportunities

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