Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river

The seasonal formation of a bottom-water layer severely depleted in dissolved oxygen has become a perennial occurrence on the Louisiana continental shelf adjacent to the Mississippi River system. Dramatic changes have occurred in this coastal ecosystem in the last half of the 20th century as the loa...

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Autor principal:	Rabalais,Nancy N
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2006
Materias:	Anoxia hypoxia eutrophication nutrients nitrogen
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300015
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spelling	oai:scielo:S0717-653820060003000152007-10-30Oxygen depletion in the gulf of Mexico adjacent to the Mississippi riverRabalais,Nancy N Anoxia hypoxia eutrophication nutrients nitrogen The seasonal formation of a bottom-water layer severely depleted in dissolved oxygen has become a perennial occurrence on the Louisiana continental shelf adjacent to the Mississippi River system. Dramatic changes have occurred in this coastal ecosystem in the last half of the 20th century as the loads of dissolved inorganic nitrogen tripled. There are increases in primary production, shifts in phytoplankton community composition, changes in trophic interactions, and worsening severity of hypoxia. The river-influenced continental shelf is representative of similar ecosystems in which increased nutrient flux to the coastal ocean has resulted in eutrophication and subsequently hypoxia. The hypoxic conditions (dissolved oxygen less than 2 mg L-1) cover up to 22,000 km² of the seabed in mid-summer. Dissolved oxygen concentrations seldom decrease to anoxia, but are often below 1 mg L-1 and down to 0.5 mg L-1. The biogeochemical processes of oxic versus suboxic conditions in the water column and sediments of the Louisiana shelf are similar to other areas of oxygen deficiency. However, the suboxic conditions in the Gulf of Mexico are less persistent in time and space, and anoxia at the seabed is not common or long-lasting.info:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana (Concepción) v.70 suppl.1 20062006-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300015en10.4067/S0717-65382006000300015
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Anoxia hypoxia eutrophication nutrients nitrogen
spellingShingle	Anoxia hypoxia eutrophication nutrients nitrogen Rabalais,Nancy N Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
description	The seasonal formation of a bottom-water layer severely depleted in dissolved oxygen has become a perennial occurrence on the Louisiana continental shelf adjacent to the Mississippi River system. Dramatic changes have occurred in this coastal ecosystem in the last half of the 20th century as the loads of dissolved inorganic nitrogen tripled. There are increases in primary production, shifts in phytoplankton community composition, changes in trophic interactions, and worsening severity of hypoxia. The river-influenced continental shelf is representative of similar ecosystems in which increased nutrient flux to the coastal ocean has resulted in eutrophication and subsequently hypoxia. The hypoxic conditions (dissolved oxygen less than 2 mg L-1) cover up to 22,000 km² of the seabed in mid-summer. Dissolved oxygen concentrations seldom decrease to anoxia, but are often below 1 mg L-1 and down to 0.5 mg L-1. The biogeochemical processes of oxic versus suboxic conditions in the water column and sediments of the Louisiana shelf are similar to other areas of oxygen deficiency. However, the suboxic conditions in the Gulf of Mexico are less persistent in time and space, and anoxia at the seabed is not common or long-lasting.
author	Rabalais,Nancy N
author_facet	Rabalais,Nancy N
author_sort	Rabalais,Nancy N
title	Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
title_short	Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
title_full	Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
title_fullStr	Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
title_full_unstemmed	Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
title_sort	oxygen depletion in the gulf of mexico adjacent to the mississippi river
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300015
work_keys_str_mv	AT rabalaisnancyn oxygendepletioninthegulfofmexicoadjacenttothemississippiriver
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Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river

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