Hipoxia en el Golfo de México Nancy N. Rabalais, Ph.D. Executive Director and Professor Louisiana...
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Transcript of Hipoxia en el Golfo de México Nancy N. Rabalais, Ph.D. Executive Director and Professor Louisiana...
Hipoxia en el Golfo de México
Nancy N. Rabalais, Ph.D.Executive Director and Professor
Louisiana Universities Marine Consortium
http://www.gulfhypoxia.net
symposium LATIN AMERICAN AND CARIBBEAN LARGE MARINE ECOSYSTEMS
Towards a regional assessment
Effects are more far reachingthan suspended sediment plume,
esp. N & somewhat P
New Orleans
dominant wind direction
Mississippi River
Atchafalaya River
Hypoxic Area
Mississippi River – Gulf of Mexico Ecosystem Continuum
Hypoxia-Eutrophication
State Waters: Estuaries, Bays, Tidal Reach of RiversWorking with GOMA Nutrient Reduction and Water Quality PITs
• Hypoxia-Nutrient Data Portal• Planning for Increased Monitoring
Shelf Waters: Time Series & AUVs
LA LATX MS ALMississippi River
Atchafalaya River
Distribution of bottom-water dissolved oxygen July 18-21 (east of the Mississippi River delta) and
July 24-30 (west of the Mississippi River delta), 2011.
Data source: NN Rabalais, Louisiana Universities Marine Consortium, and RE Turner, Louisiana State University. Funding source: National Oceanic and Atmospheric Administration, Center for Sponsored Coastal Ocean Research. http://www.gulfhypoxia.net
Brown Shrimp• Fisheries resources at risk
• Altered migration
• Reduced habitat
• Changes in food resources
• Susceptibility of early life stages• Growth & reproduction
The Consequences
Nutrients Delivered to GoMx
http://water.usgs.gov/nawqa/sparrow/gulf_findings/Alexander et al. 2008 &
*
Long Island Sound (tons N/yr)
http://dep.state.ct.us/
*33% increase since 1950
1600% increase since 1950
Mississippi River Watershed
Downing et al. 1999
*
Nutrient Sources Differ by Watershed
Hypoxia in the Gulf of Mexico
Land use change around the Grijalva Usumacinta Watershed,
(1976-2010)
EVALUACIÓN INTEGRAL Y MANEJO DEL GRAN ECOSISTEMA MARINO DEL GOLFO DE MÉXICOINTEGRATED ASSESSMENT AND MANAGEMENT OF THE GULF OF MEXICO LARGE MARINE ECOSYSTEM
www.gulfofmexicoproject.org
*
BAHIAS Cruise in June 2009RV ANTEA - IRD
Hipoxia - Grijalva-Usumacinta Cuenca
< 1.25
1.25 - 1.50
1.50 - 1.75
1.75 - 2.00
2.00 - 2.25
2.25 - 2.50
2.50 - 2.75
2.75 - 3.00
3.00 - 3.25
3.25 - 3.50
3.50 - 3.75
3.75 - 4.00
4.00 - 4.25
4.25 - 4.50
4.50 - 4.75
4.75 - 5.00
5.00 - 5.25
5.25 - 5.50
5.50 - 5.75
5.75 - 6.00
6.00 - 6.25
> 6.25
93°00'W 92°40'W 92°20'W 92°00'W 91°40'W 91°20'W8°20'N
8°40'N
9°00'N
Ciudad Del Carmen
Laguna de Terminos
Bottom Oxygen
BAHIAS Cruise in June 2009RV ANTEA - IRD
The Future
Climate ChangeOcean Acidification
BiofuelsIncreased Population
Increased AgribusinessIncreased Atmospheric
DepositionLATIN AMERICAN AND CARIBBEAN
LARGE MARINE ECOSYSTEMSTowards a regional assessment