Site M0063

Stepanova, A.; Ash, Jeanine L.; Andrén, Thomas; Zhang, R.; Slomp, Caroline P.; Torti, A.; Martin, E.; Fehr, A.; Warnock, Jonathan P.; Herrero‐Bervera, Emilio; Hyttinen, Outi; Jørgensen, B.B.; Krupinski, N. Quintana; Riedinger, Natascha; Kotthoff, Ulrich; Marshall, I.P.G.; Bauersachs, Thorsten; Green, S.; Kotilainen, Aarno; Cragg, Barry A.; Kenzler, Michael; Strano, S.; Obrochta, Stephen; Xiao, Nan; Groeneveld, Jeroen; Granoszewski, Wojciech; Jensen, J.B.; Passchier, Sandra; Fanget, A.-S.; Cotterill, C.; Snowball, Ian; Johnson, Sean; Andrén, Elinor

doi:10.2204/iodp.proc.347.107.2015

Cited by 8 publications

(17 citation statements)

References 30 publications

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“…The most striking observations for these data are that cell counts by AODC are extremely high in Unit I and that the two cell counting techniques do not produce similar results in the upper half of this hole (Fig. F19; see "Microbiology" in the "Site M0063" chapter for a similar pattern of results [Andrén et al, 2015b]). The uppermost cell count at 3.53 mbsf, by FCM, was 9.42 × 10 8 cells/cm 3 , whereas 1.23 × 10 10 cells/cm 3 were determined by AODC, a 13-fold difference.…”

Section: Microbiologymentioning

confidence: 81%

Site M0065

Andrén¹,

Jørgensen²,

Cotterill³

et al. 2015

Proceedings of the IODP

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Section: Microbiologymentioning

confidence: 81%

Site M0065

Andrén¹,

Jørgensen²,

Cotterill³

et al. 2015

Proceedings of the IODP

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“…The abundance of freshwater versus salinity tolerant diatoms (Andrén et al, 2015b), (B) total organic carbon, (C) manganese, (D) iron-to-aluminum, (E,F) Fe speciation, (G) molybdenum concentrations, and (H) molybdenum isotopes. The Medieval Climate Anomaly and Holocene Thermal Maximum is highlighted with the horizontal gray bar but is shaded upward to highlight uncertainty in locating the end of the HTM due to a lack of chronological constraints.…”

Section: Salinity Transitions and Correlations Between Sub-basinsmentioning

confidence: 99%

Holocene Spatiotemporal Redox Variations in the Southern Baltic Sea

et al. 2021

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Low oxygen conditions in the modern Baltic Sea are exacerbated by human activities; however, anoxic conditions also prevailed naturally over the Holocene. Few studies have characterized the specific paleoredox conditions (manganous, ferruginous, euxinic) and their frequency in southern Baltic sub-basins during these ancient events. Here, we apply a suite of isotope systems (Fe, Mo, S) and associated elemental proxies (e.g., Fe speciation, Mn) to specifically define water column redox regimes through the Baltic Holocene in a sill-proximal to sill-distal transect (Lille Belt, Bornholm Basin, Landsort Deep) using samples collected during the Integrated Ocean Drilling Program Expedition 347. At the sill-proximal Lille Belt, there is evidence for anoxic manganous/ferruginous conditions for most of the cored interval following the transition from the Ancylus Lake to Littorina Sea but with no clear excursion to more reducing or euxinic conditions associated with the Holocene Thermal Maximum (HTM) or Medieval Climate Anomaly (MCA) events. At the sill-distal southern sub-basin, Bornholm Basin, a combination of Fe speciation, pore water Fe, and solid phase Mo concentration and isotope data point to manganous/ferruginous conditions during the Ancylus Lake-to-Littorina Sea transition and HTM but with only brief excursions to intermittently or weakly euxinic conditions during this interval. At the western Baltic Proper sub-basin, Landsort Deep, new Fe and S isotope data bolster previous Mo isotope records and Fe speciation evidence for two distinct anoxic periods but also suggest that sulfide accumulation beyond transient levels was largely restricted to the sediment-water interface. Ultimately, the combined data from all three locations indicate that Fe enrichments typically indicative of euxinia may be best explained by Fe deposition as oxides following events likely analogous to the periodic incursions of oxygenated North Sea waters observed today, with subsequent pyrite formation in sulfidic pore waters. Additionally, the Mo isotope data from multiple Baltic Sea southern basins argue against restricted and widespread euxinic conditions, as has been demonstrated in the Baltic Proper and Bothnian Sea during the HTM or MCA. Instead, similar to today, each past Baltic anoxic event is characterized by redox conditions that become progressively more reducing with increasing distance from the sill.

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“…2). Five holes (M0063A to M0063E) were drilled using an advanced piston corer down to a diamicton (poorly sorted sandy sediment with pebbles which are glacial deposit called till) was reached at about 92 meters composite depth (mcd) (45,46). The sediments were stored in the dark in a temperature controlled room at 4°C.…”

Section: Samplingmentioning

confidence: 99%

“…Based on previous studies (15) and results from the onshore science party (46,47), sediments from three sequences of different age with anticipated high spore abundance were selected to trace the genetic diversity and the evolutionary changes in the Chaetoceros populations: the last century (M0063I 0-63 cm), MCA (M0063C 5.42-6.32 mcd) and the HTM (M0063D 21.63-26.05 mcd).…”

Section: Lithology and Sample Selectionmentioning

confidence: 99%

Holocene DNA sequences – a dream come true

Sanyal

Larsson

Wirdhum

et al. 2018

Preprint

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Microscopic marine planktons have played a major role in the Earth's ecosystem and accounts for half the globe's primary production. Predicting the fate of marine planktons is imperative to understanding how ocean life will change in future centuries and how organisms have adapted to changes in the past over long timescales (over thousands of years). Studies of revived resting spores of marine diatoms will serve as excellent proxies of environmental change in marine environments. Thus far, only about a century old marine diatom resting spores could be revived. This severely limited the use of diatom resting spores to investigate the effects of environmental perturbations over longer time scales. Here, we, for the first time report revival of thousands of years old resting spores from the deposits of ancient diatoms (Chaetoceros) in sub-seafloor sediments using a revival protocol that involved recreating the ancient environmental conditions (salinity, temperature and light). Our revived diatom resting spores samples range from recent (0-80 years) to ~7200 years old. Importantly, we also extracted the DNA from the ancient resting spores of Chaetoceros species from the Baltic Sea. Our findings will enable us to compare DNA sequence data obtained from these natural archives of resurrected organisms and provide predictive models to forecast evolutionary responses of natural populations to environmental changes resulting from natural and anthropogenic stressors, including climate change Significance StatementOur results address the important topic of adaptive evolution in marine species due to climate and environmental change induced due to anthropogenic perturbations. We present a new model system Chaetoceros muelleri which will help us address important evolutionary and long-term adaptation questions across evolutionary timescales. Our study reports (1) the revival of recent (0-80 years) to ancient (7200 years old) resting spores of Chaetoceros (2) the extraction of DNA and amplification of chloroplast and ribosomal genes from recent and ancient (~1300 years old) resting spores of Chaetoceros (3) Radiocarbon dating to determine age of sediments (4) Identification of species by reviving the resting spores (5) Baltic sea an excellent ecosystem to study long-term effects of environment on species adaptation

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Site M0063

Cited by 8 publications

References 30 publications

Site M0065

Site M0065

Holocene Spatiotemporal Redox Variations in the Southern Baltic Sea

Holocene DNA sequences – a dream come true

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