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Archaeal enrichment in the hypoxic zone in the northern Gulf of Mexico.
Gillies, Lauren E; Thrash, J Cameron; deRada, Sergio; Rabalais, Nancy N; Mason, Olivia U.
Afiliação
  • Gillies LE; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, 32306, USA.
  • Thrash JC; Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, 70803, USA.
  • deRada S; Ocean Sciences Branch, Naval Research Laboratory, Stennis Space Center, MS, 39529, USA.
  • Rabalais NN; Louisiana Universities Marine Consortium, Cocodrie, LA, 70344, USA.
  • Mason OU; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, 32306, USA.
Environ Microbiol ; 17(10): 3847-56, 2015 Oct.
Article em En | MEDLINE | ID: mdl-25818237
Areas of low oxygen have spread exponentially over the past 40 years, and are cited as a key stressor on coastal ecosystems. The world's second largest coastal hypoxic (≤ 2 mg of O2 l(-1)) zone occurs annually in the northern Gulf of Mexico. The net effect of hypoxia is the diversion of energy flow away from higher trophic levels to microorganisms. This energy shunt is consequential to the overall productivity of hypoxic water masses and the ecosystem as a whole. In this study, water column samples were collected at 39 sites in the nGOM, 21 of which were hypoxic. Analysis of the microbial community along a hypoxic to oxic dissolved oxygen gradient revealed that the relative abundance (iTag) of Thaumarchaeota species 16S rRNA genes (> 40% of the microbial community in some hypoxic samples), the absolute abundance (quantitative polymerase chain reaction; qPCR) of Thaumarchaeota 16S rRNA genes and archaeal ammonia-monooxygenase gene copy number (qPCR) were significantly higher in hypoxic samples. Spatial interpolation of the microbial and chemical data revealed a continuous, shelfwide band of low dissolved oxygen waters that were dominated by Thaumarchaeota (and Euryarchaeota), amoA genes and high concentrations of phosphate in the nGOM, thus implicating physicochemical forcing on microbial abundance.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Oxigênio / Archaea País/Região como assunto: Mexico Idioma: En Revista: Environ Microbiol Assunto da revista: MICROBIOLOGIA / SAUDE AMBIENTAL Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Oxigênio / Archaea País/Região como assunto: Mexico Idioma: En Revista: Environ Microbiol Assunto da revista: MICROBIOLOGIA / SAUDE AMBIENTAL Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Reino Unido