Data/hora: 06/06/2024 10:18:33

Provedor de dados: 	5	
País: 	France	
Título: 	Extending the sub-sea-floor biosphere	
Autores: 	Roussel, Erwan; Cambon-bonavita, Marie-anne; Querellou, Joel; Cragg, B; Webster, G; Prieur, D; Parkes, R.	
Data: 	2008-05	
Ano: 	2008	
Resumo: 	Sub-sea-floor sediments may contain two-thirds of Earth's total prokaryotic biomass. However, this has its basis in data extrapolation from ~500-meter to 4-kilometer depths, whereas the deepest documented prokaryotes are from only 842 meters. Here, we provide evidence for low concentrations of living prokaryotic cells in the deepest (1626 meters below the sea floor), oldest (111 million years old), and potentially hottest (~100°C) marine sediments investigated. These Newfoundland margin sediments also have DNA sequences related to thermophilic and/or hyperthermophilic Archaea. These form two unique clusters within Pyrococcus and Thermococcus genera, suggesting unknown, uncultured groups are present in deep, hot, marine sediments (~54° to 100°C). Sequences of anaerobic methane-oxidizing Archaea were also present, suggesting a deep biosphere partly supported by methane. These findings demonstrate that the sub-sea-floor biosphere extends to at least 1600 meters below the sea floor and probably deeper, given an upper temperature limit for prokaryotic life of at least 113°C and increasing thermogenic energy supply with depth.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2008/publication-4209.pdf

DOI:10.1126/science.1154545	
Editor: 	American Association for the Advancement of Science	
Relação: 	http://archimer.ifremer.fr/doc/00000/4209/	
Formato: 	application/pdf	
Fonte: 	Science (0036-8075) (American Association for the Advancement of Science), 2008-05 , Vol. 320 , N. 5879 , P. 1046	
Fonte: 	2008 American Association for the Advancement of Science. All Rights Reserved.