Data/hora: 09/06/2024 11:44:05

Provedor de dados: 	5	
País: 	France	
Título: 	Presence of oxygen and aerobic communities from sea floor to basement in deep-sea sediments	
Autores: 	D'Hondt, Steven; Inagaki, Fumio; Zarikian, Carlos Alvarez; Abrams, Lewis J.; Dubois, Nathalie; Engelhardt, Tim; Evans, Helen; Ferdelman, Timothy; Gribsholt, Britta; Harris, Robert N.; Hoppie, Bryce W.; Hyun, Jung-ho; Kallmeyer, Jens; Kim, Jinwook; Lynch, Jill E.; Mckinley, Claire C.; Mitsunobu, Satoshi; Morono, Yuki; Murray, Richard W.; Pockalny, Robert; Sauvage, Justine; Shimono, Takaya; Shiraishi, Fumito; Smith, David C.; Smith-duque, Christopher E.; Spivack, Arthur J.; Steinsbu, Bjorn Olav; Suzuki, Yohey; Szpak, Michal; Toffin, Laurent; Uramoto, Goichiro; Yamaguchi, Yasuhiko T.; Zhang, Guo-liang; Zhang, Xiao-hua; Ziebis, Wiebke.	
Data: 	2015-04	
Ano: 	2015	
Resumo: 	The depth of oxygen penetration into marine sediments differs considerably from one region to another. In areas with high rates of microbial respiration, O2 penetrates only millimetres to centimetres into the sediments, but active anaerobic microbial communities are present in sediments hundreds of metres or more below the sea floor. In areas with low sedimentary respiration, O2 penetrates much deeper but the depth to which microbial communities persist was previously unknown. The sediments underlying the South Pacific Gyre exhibit extremely low areal rates of respiration. Here we show that, in this region, microbial cells and aerobic respiration persist through the entire sediment sequence to depths of at least 75 metres below sea floor. Based on the Redfield stoichiometry of dissolved O2 and nitrate, we suggest that net aerobic respiration in these sediments is coupled to oxidation of marine organic matter. We identify a relationship of O2 penetration depth to sedimentation rate and sediment thickness. Extrapolating this relationship, we suggest that oxygen and aerobic communities may occur throughout the entire sediment sequence in 15–44% of the Pacific and 9–37% of the global sea floor. Subduction of the sediment and basalt from these regions is a source of oxidized material to the mantle.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00255/36658/35265.pdf

DOI:10.1038/NGEO2387

https://archimer.ifremer.fr/doc/00255/36658/	
Editor: 	Nature Publishing Group	
Formato: 	application/pdf	
Fonte: 	Nature Geoscience (1752-0894) (Nature Publishing Group), 2015-04 , Vol. 8 , N. 4 , P. 299-304	
Fonte: 	2015 Macmillan Publishers Limited. All Rights Reserved.

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