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  • 1
    Online Resource
    Online Resource
    Distribution of living benthic foraminifera in sediment cores of cruise M77 Leg 1 and 2, 63-2000 ?m fraction, supplementary data to: Mallon, Jürgen; Glock, Nikolaas; Schönfeld, Joachim (2011): The response of benthic foraminifera to low-oxygen conditions of the Peruvian oxygen minimum zone. In: Anoxia: Paleontological Strategies and Evidence for Eucaryotic Survival. Cellular Origins, Life in Extreme Habitats and Astrobiology, Cole Book Series, Springer Publisher (2011)
    Details Availability
    Keywords: Datensammlung
    Description / Table of Contents: Recent benthic foraminifera and their distribution in surface sediments were studied on a transect through the Peruvian oxygen minimum zone (OMZ) between 10 and 12?S. The OMZ with its steep gradients of oxygen concentrations allows to determine the oxygen-dependent changes of species compositions in a relatively small area. Our results from sediments of thirteen multicorer stations from 79 to 823 m water depth demonstrate that calcareous species, especially bolivinids dominate the assemblages throughout the OMZ. The depth distribution of several species matches distinct ranges of bottom water oxygen levels. The distribution pattern inferred a proxy which allows to estimate dissolved oxygen concentrations for reconstructing oxygen levels in the geological past.
    Type of Medium: Online Resource
    Pages: 923 DataPoints , Format: text/tab-separated-values
    URL: http://dx.doi.org/10.1594/PANGAEA.757092
    URL: http://nbn-resolving.de/urn:nbn:de:tib-10.1594/PANGAEA.7570927
    URN: urn:nbn:de:tib-10.1594/PANGAEA.7570927
    DOI: 10.1594/PANGAEA.757092
    Language: English
    Note: This dataset is supplement to doi:10.1007/978-94-007-1896-8_16
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  • 2
    Online Resource
    Online Resource
    Benthic Foraminifera of the Peruvian and Ecuadorian Continental Margin (2012)
    Details Availability
    Keywords: Hochschulschrift ; Peru ; Ecuador ; Kontinentalrand ; Benthos ; Foraminiferen
    Type of Medium: Online Resource
    Pages: Online-Ressource
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:8-diss-75694
    URL: http://d-nb.info/1020284048/34
    URL: http://eldiss.uni-kiel.de/macau/receive/dissertation_diss_00007569
    URN: urn:nbn:de:gbv:8-diss-75694
    DDC: 570
    Language: English
    Note: Kiel, Univ., Diss., 2012
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  • 3
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    Benthic foraminiferal denitrification rates and nitrate storage (2013)
    PANGAEA
    In:  Supplement to: Glock, Nicolaas; Schönfeld, Joachim; Eisenhauer, Anton; Hensen, Christian; Mallon, Jürgen; Sommer, Stefan (2013): The role of benthic foraminifera in the benthic nitrogen cycle of the Peruvian oxygen minimum zone. Biogeosciences, 10(7), 4767-4783, https://doi.org/10.5194/bg-10-4767-2013
    Details
    Publication Date: 2023-10-28
    Description: The discovery that foraminifera are able to use nitrate instead of oxygen as energy source for their metabolism has challenged our understanding of nitrogen cycling in the ocean. It was evident before that only prokaryotes and fungi are able to denitrify. Rate estimates of foraminiferal denitrification were very sparse on a regional scale. Here, we present estimates of benthic foraminiferal denitrification rates from six stations at intermediate water depths in and below the Peruvian oxygen minimum zone (OMZ). Foraminiferal denitrification rates were calculated from abundance and assemblage composition of the total living fauna in both, surface and subsurface sediments, as well as from individual species specific denitrification rates. A comparison with total benthic denitrification rates as inferred by biogeochemical models revealed that benthic foraminifera account for the total denitrification on the shelf between 80 and 250 m water depth. They are still important denitrifiers in the centre of the OMZ around 320 m (29-56% of the benthic denitrification) but play only a minor role at the lower OMZ boundary and below the OMZ between 465 and 700 m (3-7% of total benthic denitrification). Furthermore, foraminiferal denitrification was compared to the total benthic nitrate loss measured during benthic chamber experiments. Foraminiferal denitrification contributes 1 to 50% to the total nitrate loss across a depth transect from 80 to 700 m, respectively. Flux rate estimates ranged from 0.01 to 1.3 mmol m-2 d-1. Furthermore we show that the amount of nitrate stored in living benthic foraminifera (3 to 705 µmol L-1) can be higher by three orders of magnitude as compared to the ambient pore waters in near surface sediments sustaining an important nitrate reservoir in Peruvian OMZ sediments. The substantial contribution of foraminiferal nitrate respiration to total benthic nitrate loss at the Peruvian margin, which is one of the main nitrate sink regions in the world oceans, underpins the importance of previously underestimated role of benthic foraminifera in global biochemical cycles.
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 4
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    Geochemistry at BIGO station MSM17/4_485 on given timesteps (2014)
    PANGAEA
    Details
    Publication Date: 2024-04-18
    Keywords: Alkalinity, total; Ammonium; Barium; BIGO; Biogeochemical observatory; Boron; Bromide; Calcium; Chloride; Climate - Biogeochemistry Interactions in the Tropical Ocean; Inductively coupled plasma atomic emission spectroscope (ICP-AES); Ion chromatography; Iron; Lithium; Magnesium; Manganese; Maria S. Merian; MSM17/4; MSM17/4_485; Nitrate; Nitrite; Number; Phosphate; Photometry; Potassium; Sample ID; SFB754; Silicate; Silicon; Sodium; South Atlantic Ocean; Strontium; Sulfate; Time in hours; Titration, Pavlova; δ15N, nitrate; δ15N, nitrite; δ18O, nitrate
    Type: Dataset
    Format: text/tab-separated-values, 570 data points
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    DATA PANGAEA
  • 5
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    Distribution of living benthic foraminifera in sediment cores of cruise M77 Leg 1 and 2, 63-2000 µm fraction (2011)
    PANGAEA
    In:  Supplement to: Mallon, Jürgen; Glock, Nicolaas; Schönfeld, Joachim (2011): The response of benthic foraminifera to low-oxygen conditions of the Peruvian oxygen minimum zone. In: Anoxia: Paleontological Strategies and Evidence for Eucaryotic Survival. Cellular Origins, Life in Extreme Habitats and Astrobiology, Cole Book Series, Springer Publisher, 21, 305-321, https://doi.org/10.1007/978-94-007-1896-8_16
    Details
    Publication Date: 2024-04-18
    Description: Recent benthic foraminifera and their distribution in surface sediments were studied on a transect through the Peruvian oxygen minimum zone (OMZ) between 10 and 12°S. The OMZ with its steep gradients of oxygen concentrations allows to determine the oxygen-dependent changes of species compositions in a relatively small area. Our results from sediments of thirteen multicorer stations from 79 to 823 m water depth demonstrate that calcareous species, especially bolivinids dominate the assemblages throughout the OMZ. The depth distribution of several species matches distinct ranges of bottom water oxygen levels. The distribution pattern inferred a proxy which allows to estimate dissolved oxygen concentrations for reconstructing oxygen levels in the geological past.
    Keywords: Adercotryma glomeratum; Ammobaculites agglutinans; Ammodiscus incertus; Ammodiscus tenuis; Angulogerina angulosa; Angulogerina carinata; Bolivina alata; Bolivina costata; Bolivina interjuncta; Bolivina plicata; Bolivina seminuda; Bolivina spissa; Bolivina subadvena serrata; Bolivina subaenariensis; Bolivinita minuta; Bulimina pupoides; Buliminella curta; Buliminella curta bassispinata; Buliminella elegantissima limbosa; Buliminella elegantissima tenuis; Cancris carmenensis; Cassidulina auka; Cassidulina crassa; Cassidulina delicata; Cibicidoides wuellerstorfi; Climate - Biogeochemistry Interactions in the Tropical Ocean; Counting 63-2000 µm fraction; Cribrogoesella pacifica; Cyclammina cancellata; DEPTH, sediment/rock; Eggerella scabra; Ehrenbergina compressa; Elevation of event; Epistominella obesa; Epistominella pacifica; Event label; Fursenkoina fusiformis; Gaudryina bradyi; Glomospira gordialis; Gyroidina neosoldanii; Gyroidina soldanii; Gyroidina soldanii multilocula; Hanzawaia mexicana; Haplophragmoides canariensis; Haplophragmoides canariensis mexicana; Haplophragmoides columbiense evolutum; Hoeglundina elegans; Individuals; Latitude of event; Lenticulina convergens; Longitude of event; M77/1; M77/1_449-1; M77/1_456-1; M77/1_459-1; M77/1_470-1; M77/1_473-1; M77/1_482-1; M77/1_487-1; M77/1_516-1; M77/1_540-1; M77/1_553-1; M77/1_616-1; M77/1_622-1; M77/2; M77/2_002-2; M77/2_635-3; Marsipella granulosa; Meteor (1986); MUC; MUC 19; MUC 25; MUC 29; MUC 38; MultiCorer; Multicorer with television; Nonionella auris; Nonionella stella; Nummoloculina irregularis; Oridorsalis umbonatus; Planulina ecuadorana; Pleurostomella brevis; Pullenia elegans; Pulvinulinella subperuviana; Recurvoides contortus; Reophax apiculatus; Reophax dentaliniformis; Reophax scorpiurus; SFB754; Split; Suggrunda porosa; Taxa analyzed; Trochammina globorotaliformis; Trochammina squamata; TVMUC; Uvigerina auberiana; Uvigerina canariensis; Uvigerina peregrina; Uvigerina striata; Valvulina oblonga; Valvulineria glabra; Verneuilina bradyi; Verneuilina propinqua; Virgulina texturata
    Type: Dataset
    Format: text/tab-separated-values, 923 data points
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    DATA PANGAEA
  • 6
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    The role of benthic foraminifera in the benthic nitrogen cycle of the Peruvian oxygen minimum zone (2013)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 10 . pp. 4767-4783.
    Details
    Publication Date: 2019-09-23
    Description: The discovery that foraminifera are able to use nitrate instead of oxygen as energy source for their metabolism has challenged our understanding of nitrogen cycling in the ocean. It was evident before that only prokaryotes and fungi are able to denitrify. Rate 5 estimates of foraminiferal denitrification were very sparse on a regional scale. Here, we present estimates of benthic foraminiferal denitrification rates from six stations at intermediate water depths in and below the Peruvian oxygen minimum zone (OMZ). Foraminiferal denitrification rates were calculated from abundance and assemblage composition of the total living fauna in both, surface and subsurface sediments, 10 as well as from individual species specific denitrification rates. A comparison with total benthic denitrification rates as inferred by biogeochemical models revealed that benthic foraminifera account for the total denitrification on the shelf between 80 and 250m water depth. They are still important denitrifiers in the centre of the OMZ around 320m (29–56% of the benthic denitrification) but play only a minor role at the lower OMZ 15 boundary and below the OMZ between 465 and 700m (3–7% of total benthic denitrification). Furthermore, foraminiferal denitrification was compared to the total benthic nitrate loss measured during benthic chamber experiments. Foraminiferal denitrification contributes 1 to 50% to the total nitrate loss across a depth transect from 80 to 700 m, respectively. Flux rate estimates ranged from 0.01 to 1.3 mmolm−2 d−1. Fur20 thermore we show that the amount of nitrate stored in living benthic foraminifera (3 to 705 μmolL−1) can be higher by three orders of magnitude as compared to the ambient pore waters in near surface sediments sustaining an important nitrate reservoir in Peruvian OMZ sediments. The substantial contribution of foraminiferal nitrate respiration to total benthic nitrate loss at the Peruvian margin, which is one of the main nitrate sink 25 regions in the world oceans, underpins the importance of previously underestimated role of benthic foraminifera in global biochemical cycles.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/bg-10-4767-2013
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Environmental Influences on the Pore Density in Bolivina spissa (2010)
    In:  [Talk] In: FORAMS 2010 - International Symposium on Foraminifera, 05.09.-10.09.2010, Bonn .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 8
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    Environmental influences on the pore density of Bolivina spissa (Cushman) (2011)
    Cushman Foundation for Foraminiferal Research
    In:  Journal of Foraminiferal Research, 41 (1). pp. 22-32.
    Details
    Publication Date: 2019-09-23
    Description: The pore-densities (PD) in the tests of 232 specimens of the shallow infaunal foraminiferal species Bolivina spissa from eight locations off the Peruvian continental margin were investigated and compared to different environmental factors as water-depth, temperature, bottom-water oxygen ([O2]BW) and nitrate concentrations ([NO3–]BW). There is a negative exponential PD-[O2]BW correlation, but at oxygen-concentrations 〉10 µmol/l PD approaches a constant value without any further correlation to [O2]BW. The PD-[NO3–]BW relationship is better constrained than that for PD-[O2]BW. We hypothesize that the pores in the tests of B. spissa largely reflect the intracellular nitrate, and to a smaller extent the oxygen respiration. We also compared PD and porosity (P) of two single B.spissa and B.seminuda specimens from the same habitat. The comparison showed that P is significantly higher in B.seminuda than in B. spissa indicating that B.seminuda is much better adapted to strong oxygen-depleted habitats than B.spissa.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.2113/gsjfr.41.1.22
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Benthic Foraminfera of the Peruvian and Ecuadorian Continental Margin (2012)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 236 pp
    Details
    Publication Date: 2019-09-23
    Description: This study investigated the distribution of living (Rose Bengal stained) benthic foraminifera of the northwestern continental margin of South America with focus on the Peruvian oxygen minimum zone (OMZ) inhabiting species. Further, a new proxy for bottom water oxygen concentrations based on benthic foraminifera has been developed. On sediment core SO147-106KL from the Peruvian OMZ which comprises the last 20 kys the new proxy was applied to reconstruct the variability of bottom water oxygen concentrations during the past 19.6 kys.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 10
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    Living (Rose Bengal) stained benthic foraminifera of the Peruvian oxygen mimimum zone as a new proxy for oxygen reconstruction (2010)
    In:  [Poster] In: 10th International Conference on Paleoceanography, 29.08.-03.09.2010, La Jolla, Kalifornien, USA .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Poster
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