Arabian Sea Organic Carbon, Biomarker and XRF-Br data covering the last 50 ka Orsi, W.D.; Coolen, M.J.L.; Wuchter, C.; He, L.; More, K.D.; Irigoien, X.; Chust, G.; Johnson, C.; Hemingway, J.D.; Lee, M.; Galy, V.V.; Giosan, L. Orsi, W.D. Coolen, M.J.L. Wuchter, C. He, L. More, K.D. Irigoien, X. Chust, G. Johnson, C. Hemingway, J.D. Lee, M. Galy, V.V. Giosan, L. earth science/paleoclimate/paleoceanography (organic carbon,sediment,one standard error,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,null,one standard error,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (nitrogen,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (bromine,null,null,count per second,null,paleoceanography,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (C37:2 alkenone,null,null,microgram per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone,null,null,microgram per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (nitrogen,sediment,one standard error,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 15N,null,null,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (C37:3 alkenone,null,null,microgram per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (organic carbon,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,null,null,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 15N,null,one standard error,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (64PE300–11>LATITUDE 23.121667>LONGITUDE 66.496667) Selection of microorganisms in marine sediment is shaped by energy-yielding electron acceptors for respiration that are depleted in vertical succession. However, some taxa have been reported to reflect past depositional conditions suggesting they have experienced weak selection after burial. In sediments underlying the Arabian Sea oxygen minimum zone (OMZ), we performed the first metagenomic profiling of sedimentary DNA at centennial-scale resolution in the context of a multi-proxy paleoclimate reconstruction. While vertical distributions of sulfate reducing bacteria and methanogens indicate energy-based selection typical of anoxic marine sediments, 5-15% of taxa per sample exhibit depthindependent stratigraphies indicative of paleoenvironmental selection over relatively short geological timescales. Despite being vertically separated, indicator taxa deposited under OMZ conditions were more similar to one another than those deposited in bioturbated intervals under intervening higher oxygen. The genomic potential for denitrification also correlated with palaeo-OMZ proxies, independent of sediment depth and available nitrate and nitrite. However, metagenomes revealed mixed acid and Entner-Dourdoroff fermentation pathways encoded by many of the same denitrifier groups. Fermentation thus may explain the subsistence of these facultatively anaerobic microbes whose stratigraphy follows changing paleoceanographic conditions. At least for certain taxa, our analysis provides evidence of their paleoenvironmental selection over the last glacial-interglacial cycle. STUDY NOTES: This study contains the biomarker record for core 11C with corresponding depth and age of samples measured Provided Keywords: oxygen minimum zone, alkenone, sea surface temperature NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Orsi, W.D. Investigator : Coolen, M.J.L. Investigator : Wuchter, C. Investigator : He, L. Investigator : More, K.D. Investigator : Irigoien, X. Investigator : Chust, G. Investigator : Johnson, C. Investigator : Hemingway, J.D. Investigator : Lee, M. Investigator : Galy, V.V. Investigator : Giosan, L. 2017-07-15 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22392 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-oc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-bio.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-br.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-oc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-bio.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-br.txt English https://www.ncdc.noaa.gov/paleo/study/22392 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-oc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-bio.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/orsi2017/orsi2017-br.txt Orsi, W.D.; Coolen, M.J.L; Wuchter, C.; He, L.; More, K.D.; Irigoien, X.; Chust, G.; Johnson, C.; Hemingway, J.D.; Lee, M.; Galy, V.; Giosan, L.2017Climate oscillations reflected within the microbiome of Arabian Sea sedimentsScientific Reports710.1038/s41598-017-05590-9 START YEAR: 52900 cal yr BP * END YEAR: 330 cal yr BP 66.496667 23.121667 66.496667 23.121667