georefid:2011-038149SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-07-06T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1073/pnas.08117931062009-01-01publicationgeorefid:2011-038149doi:10.1073/pnas.0811793106D'Hondt, StevenUniversity of Rhode Island, Graduate School of Oceanography, Narragansett, RI, United StatesauthorSpivack, Arthur J.Max Planck Institute for Marine Microbiology, GermanyauthorPockalny, RobertUniversity of Potsdam, GermanyauthorFerdelman, Timothy G.University of North Carolina at Wilmington, United StatesauthorFischer, Jan P.University of Michigan, United StatesauthorKallmeyer, JensauthorAbrams, Lewis J.authorSmith, David C.authorGraham, DennisauthorHasiuk, Franciszek J.authorSchrum, HeatherauthorStancin, Andrea M.authorNational Academy of Sciences, Washington, DC, United StatespublisherdocumentHardcopyProceedings of the National Academy of Sciences of the United States of America106 (28)11651-11656The low-productivity South Pacific Gyre (SPG) is Earth's largest oceanic province. Its sediment accumulates extraordinarily slowly (0.1-1 m per million years). This sediment contains a living community that is characterized by very low biomass and very low metabolic activity. At every depth in cored SPG sediment, mean cell abundances are 3 to 4 orders of magnitude lower than at the same depths in all previously explored subseafloor communities. The net rate of respiration by the subseafloor sedimentary community at each SPG site is 1 to 3 orders of magnitude lower than the rates at previously explored sites. Because of the low respiration rates and the thinness of the sediment, interstitial waters are oxic throughout the sediment column in most of this region. Consequently, the sedimentary community of the SPG is predominantly aerobic, unlike previously explored subseafloor communities. Generation of H (sub 2) by radiolysis of water is a significant electron-donor source for this community. The per-cell respiration rates of this community are about 2 orders of magnitude higher (in oxidation/reduction equivalents) than in previously explored anaerobic subseafloor communities. Respiration rates and cell concentrations in subseafloor sediment throughout almost half of the world ocean may approach those in SPG sediment.completedOceanographyaerobic environmentbiomassburialcarbonCenozoicchlorophyllcoresCretaceousEast PacificecologyEquatorial PacifichydrogenLeg 201marine environmentmarine sedimentsMesozoicNorth PacificNortheast PacificOcean Drilling ProgramODP Site 1225ODP Site 1226ODP Site 1227ODP Site 1230ODP Site 1231organic carbonorganic compoundsoxygenPacific OceanPeru-Chile Trenchpigmentsporphyrinsproductivityrespirationsedimentationsedimentation ratessedimentsSouth PacificSouth Pacific GyreSoutheast PacificUpper Cretaceouswaterurn:org.iodp:exp:201urnlargerWorkCitationcampaignurn:org.iodp:exp:201:site:1225urnlargerWorkCitationstudyurn:org.iodp:exp:201urnlargerWorkCitationcampaignurn:org.iodp:exp:201:site:1226urnlargerWorkCitationstudyurn:org.iodp:exp:201urnlargerWorkCitationcampaignurn:org.iodp:exp:201:site:1227urnlargerWorkCitationstudyurn:org.iodp:exp:201urnlargerWorkCitationcampaignurn:org.iodp:exp:201:site:1230urnlargerWorkCitationstudyurn:org.iodp:exp:201urnlargerWorkCitationcampaignurn:org.iodp:exp:201:site:1231urnlargerWorkCitationstudyurn:org.iodp:exp:201urnlargerWorkCitationcampaignEnglishgeoscientificInformation-90.4900166.0000-46.0000-3.0600