GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
Publikationsart
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1
    facet.materialart.
    Unbekannt
    Concentrations and TEX86 values of GDGTs present as core lipids and derived from intact polar lipids of station PASOM_10_WS water samples
    PANGAEA
    In:  Supplement to: Schouten, Stefan; Pitcher, Angela; Hopmans, Ellen C; Villanueva, Laura; van Bleijswijk, Judith; Sinninghe Damsté, Jaap S (2012): Intact polar and core glycerol dibiphytanyl glycerol tetraether lipids in the Arabian Sea oxygen minimum zone: I. Selective preservation and degradation in the water column and consequences for the TEX86. Geochimica et Cosmochimica Acta, 98, 228-243, https://doi.org/10.1016/j.gca.2012.05.002
    Details
    Publikationsdatum: 2023-05-12
    Beschreibung: Glycerol dibiphytanyl glycerol tetraether lipids (GDGTs) have proven to be important biomarker lipids for specific archaeal lineages and their distribution is used as a paleotemperature proxy. In this study, we analyzed GDGTs in suspended particles in the water column of the Arabian Sea at different positions above, in and below the oxygen minimum zone (OMZ). GDGTs, both as intact polar lipid (IPL) and as core lipids, were detected throughout the water column but were most abundant at the upper part of the OMZ. Core lipid GDGTs, derived from non-living organic matter, were always much more abundant than GDGTs released by acid hydrolysis of an IPL fraction (IPL-derived GDGTs). Comparisons with 16S rRNA gene abundance showed that likely only 1-14% of total archaeal cells present were caught on the 0.7 lm filter used for lipid analysis. Despite this undersampling, the depth profiles of crenarchaeol core lipid with a phosphohexose or dihexose head group match previously reported profiles of (expressed) genes specific for ammonia-oxidizing Thaumarchaeota, such as 16S rDNA and amoA. In contrast, the crenarchaeol with a hexose head group as well as core lipid and IPL-derived crenarchaeol matched the genetic depth profiles much less, suggesting a contribution of GDGTs from non-living matter. TEX86 values of both core lipid and IPL-derived GDGTs increased from surface waters to the core of the OMZ, below which they decreased again, and did not correlate with in situ water temperature. In contrast, TEX86 values of IPL-derived GDGTs correlated well the relative amount of glycosidic GDGTs and were consistently higher than that those of CL GDGTs. This suggests that selective preservation of glycosidic GDGTs may mask TEX86 values of in situ produced GDGTs in deep marine waters.
    Schlagwort(e): 64PE301; Acyclic glycerol dialkyl glycerol tetraether; Crenarchaeol; Crenarchaeol isomer; DEPTH, water; Dicyclic glycerol dialkyl glycerol tetraether; Glycerol dialkyl glycerol tetraether; Intact polar lipids; Monocyclic glycerol dialkyl glycerol tetraether; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; PASOM; PASOM_10_WS; Pelagia; Tetraether index of 86 carbon atoms; Thaumarchaeota 16S copy number; Tricyclic glycerol dialkyl glycerol tetraether; Water sample; WS
    Materialart: Dataset
    Format: text/tab-separated-values, 216 data points
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATA PANGAEA
  • 2
    facet.materialart.
    Unbekannt
    Coral calcification under daily oxygen saturation and pH dynamics reveals the important role of oxygen (2014)
    PANGAEA
    In:  Supplement to: Wijgerde, Tim; Silva, Catarina I F; Scherders, Vera; van Bleijswijk, Judith; Osinga, Ronald (2014): Coral calcification under daily oxygen saturation and pH dynamics reveals the important role of oxygen. Biology Open, 3(6), 489-493, https://doi.org/10.1242/bio.20147922
    Details
    Publikationsdatum: 2024-03-15
    Beschreibung: Coral reefs are essential to many nations, and are currently in global decline. Although climate models predict decreases in seawater pH (0.3 units) and oxygen saturation (5 percentage points), these are exceeded by the current daily pH and oxygen fluctuations on many reefs (pH 7.8-8.7 and 27-241% O2 saturation). We investigated the effect of oxygen and pH fluctuations on coral calcification in the laboratory using the model species Acropora millepora. Light calcification rates were greatly enhanced (+178%) by increased seawater pH, but only at normoxia; hyperoxia completely negated this positive effect. Dark calcification rates were significantly inhibited (51-75%) at hypoxia, whereas pH had no effect. Our preliminary results suggest that within the current oxygen and pH range, oxygen has substantial control over coral growth, whereas the role of pH is limited. This has implications for reef formation in this era of rapid climate change, which is accompanied by a decrease in seawater oxygen saturation owing to higher water temperatures and coastal eutrophication.
    Schlagwort(e): Acropora millepora; Alkalinity, total; Alkalinity, total, standard deviation; Animalia; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthic animals; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Calcification/Dissolution; Calcification rate of calcium carbonate; Calcite saturation state; Calcite saturation state, standard deviation; Calculated; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Cnidaria; Coast and continental shelf; Containers and aquaria (20-1000 L or 〈 1 m**2); Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Irradiance; Laboratory experiment; OA-ICC; Ocean Acidification International Coordination Centre; Other; Oxygen; Oxygen, standard deviation; Oxygen saturation; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard deviation; Potentiometric; Potentiometric titration; Salinity; Single species; South Pacific; Species; Temperature, water; Temperature, water, standard deviation
    Materialart: Dataset
    Format: text/tab-separated-values, 1312 data points
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATA PANGAEA
  • 3
    facet.materialart.
    Unbekannt
    Spatial synchronies in the seasonal occurrence of larvae of oyster (Crassostrea gigas) and mussels (Mytilus edulis/galloprovincialis) in European coastal waters (2012)
    Elsevier
    In:  EPIC3Estuarine, Coastal and Shelf Science, Elsevier, 108, pp. 52-63
    Details
    Publikationsdatum: 2019-07-16
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OA)
  • 4
    facet.materialart.
    Unbekannt
    Archaeal nitrification in the ocean (2008)
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © National Academy of Sciences, 2006. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences 103 (2006): 12317-12322, doi:10.1073/pnas.0600756103.
    Beschreibung: Marine Crenarchaeota are the most abundant single group of prokaryotes in the ocean but their physiology and role in marine biogeochemical cycles are unknown. Recently, a member of this clade was isolated from a sea aquarium and shown to be capable of nitrification, tentatively suggesting that they may play a role in the oceanic nitrogen cycle. We enriched a crenarchaeote from North Sea water and show that it oxidizes ammonium to nitrite. A time series study in the North Sea revealed that the abundance of the gene encoding for the archaeal ammonia monooxygenase alfa subunit (amoA) is correlated with the decline in ammonium concentrations and with the abundance of Crenarcheota. Remarkably, the archaeal amoA abundance was 1-2 orders of magnitude higher than those of bacterial nitrifiers which are commonly thought to mediate the oxidation of ammonium to nitrite in marine environments. Analysis of Atlantic waters of the upper 1000 m, where most of the ammonium regeneration and oxidation takes place, showed that crenarchaeotal amoA copy numbers are also one to three orders of magnitude higher than those of bacterial amoA. Our data thus suggest a major role for Archaea in oceanic nitrification.
    Beschreibung: This study was partially supported by grants to JSSD and MJLC (VENI) from the Netherlands Organisation for Scientific Research (NWO).
    Repository-Name: Woods Hole Open Access Server
    Materialart: Preprint
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OA)
  • 5
    facet.materialart.
    Unbekannt
    Putative ammonia-oxidizing Crenarchaeota in suboxic waters of the Black Sea : a basin-wide ecological study using 16S ribosomal and functional genes and membrane lipids (2008)
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © Blackwell, 2007. This is the author's version of the work. It is posted here by permission of Blackwell for personal use, not for redistribution. The definitive version was published in Environmental Microbiology 9 (2007): 1001-1016, doi:10.1111/j.1462-2920.2006.01227.x.
    Beschreibung: Within the upper 400 m at western, central, and eastern stations in the world’s largest stratified basin, the Black Sea, we studied the qualitative and quantitative distribution of putative nitrifying Archaea based on their genetic markers (16S rDNA, amoA encoding for the alfa-subunit of archaeal ammonia monooxygenase), and crenarchaeol, the specific glycerol diphytanyl glycerol tetraether (GDGT) of pelagic Crenarchaeota within the Group I.1a. Marine Crenarchaeota were the most abundant Archaea (up to 98% of the total archaeal 16S rDNA copies) in the suboxic layers with oxygen levels as low as 1 μM including layers where previously anammox bacteria were described (Kuypers et al., 2003). Different marine crenarchaeotal phylotypes (both 16S rDNA and amoA) were found at the upper part of the suboxic zone as compared to the base of the suboxic zone and the upper 15-30 m of the anoxic waters with prevailing sulfide concentrations of up to 30 μM. Crenarchaeol concentrations were higher in the sulfidic chemocline as compared to the suboxic zone. These results indicate an abundance of putative nitrifying Archaea at very low oxygen levels within the Black Sea and might form an important source of nitrite for the anammox reaction.
    Beschreibung: This work was supported by a grant from the Netherlands Organization for Scientific Research (VENI Innovational Research Grant nr. 813.13.001 to MJLC), an U. S. National Science Foundation grant OCE0117824 to SGW and the Spinoza award to JSSD, which we greatly acknowledge.
    Schlagwort(e): Black Sea ; Ammonia oxidizing Archaea ; amoA ; Crenarchaeol ; DGGE ; Quantitative real-time PCR
    Repository-Name: Woods Hole Open Access Server
    Materialart: Preprint
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OA)
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...