title: Distributions of microbial activities in deep subseafloor sediments.
abstract: Diverse microbial communities and numerous energy-yielding activities occur in deeply buried sediments of the eastern Pacific Ocean. Distributions of metabolic activities often deviate from the standard model. Rates of activities, cell concentrations, and populations of cultured bacteria vary consistently from one subseafloor environment to another. Net rates of major activities principally rely on electron acceptors and electron donors from the photosynthetic surface world. At open-ocean sites, nitrate and oxygen are supplied to the deepest sedimentary communities through the underlying basaltic aquifer. In turn, these sedimentary communities may supply dissolved electron donors and nutrients to the underlying crustal biosphere.
authors.affiliation: Ocean Drilling Program Leg 201 Shipboard Scientific Party, NASA Astrobiology Institute, University of Rhode Island Graduate School of Oceanography, South Ferry Road, Narragansett, RI 02882, USA. dhondt@gso.uri.edu
authors.forename: Steven
authors.initials: S
authors.lastname: D'Hondt
authors.forename: Bo Barker
authors.initials: BB
authors.lastname: Jørgensen
authors.forename: D Jay
authors.initials: DJ
authors.lastname: Miller
authors.forename: Anja
authors.initials: A
authors.lastname: Batzke
authors.forename: Ruth
authors.initials: R
authors.lastname: Blake
authors.forename: Barry A
authors.initials: BA
authors.lastname: Cragg
authors.forename: Heribert
authors.initials: H
authors.lastname: Cypionka
authors.forename: Gerald R
authors.initials: GR
authors.lastname: Dickens
authors.forename: Timothy
authors.initials: T
authors.lastname: Ferdelman
authors.forename: Kai-Uwe
authors.initials: KU
authors.lastname: Hinrichs
authors.forename: Nils G
authors.initials: NG
authors.lastname: Holm
authors.forename: Richard
authors.initials: R
authors.lastname: Mitterer
authors.forename: Arthur
authors.initials: A
authors.lastname: Spivack
authors.forename: Guizhi
authors.initials: G
authors.lastname: Wang
authors.forename: Barbara
authors.initials: B
authors.lastname: Bekins
authors.forename: Bert
authors.initials: B
authors.lastname: Engelen
authors.forename: Kathryn
authors.initials: K
authors.lastname: Ford
authors.forename: Glen
authors.initials: G
authors.lastname: Gettemy
authors.forename: Scott D
authors.initials: SD
authors.lastname: Rutherford
authors.forename: Henrik
authors.initials: H
authors.lastname: Sass
authors.forename: C Gregory
authors.initials: CG
authors.lastname: Skilbeck
authors.forename: Ivano W
authors.initials: IW
authors.lastname: Aiello
authors.forename: Gilles
authors.initials: G
authors.lastname: Guèrin
authors.forename: Christopher H
authors.initials: CH
authors.lastname: House
authors.forename: Fumio
authors.initials: F
authors.lastname: Inagaki
authors.forename: Patrick
authors.initials: P
authors.lastname: Meister
authors.forename: Thomas
authors.initials: T
authors.lastname: Naehr
authors.forename: Sachiko
authors.initials: S
authors.lastname: Niitsuma
authors.forename: R John
authors.initials: RJ
authors.lastname: Parkes
authors.forename: Axel
authors.initials: A
authors.lastname: Schippers
authors.forename: David C
authors.initials: DC
authors.lastname: Smith
authors.forename: Andreas
authors.initials: A
authors.lastname: Teske
authors.forename: Juergen
authors.initials: J
authors.lastname: Wiegel
authors.forename: Christian Naranjo
authors.initials: CN
authors.lastname: Padilla
authors.forename: Juana Luz Solis
authors.initials: JL
authors.lastname: Acosta
mesh_terms: D001419:Bacteria / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D002244:Carbon / Q000378:metabolism; D015169:Colony Count, Microbial; D017753:Ecosystem; D004579:Electron Transport; D019015:Geologic Sediments / Q000382:microbiology*; D007501:Iron / Q000378:metabolism; D008345:Manganese / Q000378:metabolism; D008697:Methane / Q000378:metabolism; D009566:Nitrates / Q000378:metabolism; D016877:Oxidants / Q000378:metabolism; D010084:Oxidation-Reduction; D010140:Pacific Ocean; D010568:Peru; D010788:Photosynthesis; D012623:Seawater / Q000737:chemistry; D013431:Sulfates / Q000378:metabolism; D013816:Thermodynamics
chemical_list: D009566:Nitrates; D016877:Oxidants; D013431:Sulfates; D008345:Manganese; D002244:Carbon; D007501:Iron; D008697:Methane