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  • 1
    Online Resource
    Online Resource
    Endolithic Algae Affect Modern Coral Carbonate Morphology and Chemistry (2019)
    Lausanne : Frontiers Media | Kiel : Universitätsbibliothek
    Details Availability
    In: Frontiers in Earth Science, 7 (2019), 304, 2296-6463
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (19 Seiten) , Illustrationen
    ISSN: 2296-6463
    URL: https://doi.org/10.3389/feart.2019.00304
    URL: https://nbn-resolving.org/urn:nbn:de:gbv:8-mods-2020-00087-5
    URL: https://macau.uni-kiel.de/receive/macau_mods_00000367
    URN: urn:nbn:de:gbv:8-mods-2020-00087-5
    Language: English
    Note: DOI der ursprünglichen Veröffentlichung: 10.3389/feart.2019.00304
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    GEOMAR CATALOGUE
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  • 2
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    Geochemical data from in-situ peeper sampling MSM21/4_647-1 (2019)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: Six peepers were deployed by the German submersible Jago in sediment of the methane seep area off northwestern Svalbard at the gas hydrate stability limit. Peeper 1 and 2 were deployed in a sulfur bacteria mat, Peeper 3 and 4 were in a siboglinid (pogonophoran) worm field, and Peeper 5 and 6 were at a gas vent. The distance between the three groups was about 1 meter. After 10 days incubation, peeper were retrieved and porewater solutes were measured in the peeper samples.
    Keywords: Alkalinity, total; Bromide; Chamber number; Chloride; DEPTH, sediment/rock; Geochemistry; Hydrogen sulfide; JAGO; Maria S. Merian; Methane; MSM21/4; MSM21/4_647-1; North Greenland Sea; Number; sediment porewater; Submersible JAGO; Sulfate; Svalbard
    Type: Dataset
    Format: text/tab-separated-values, 321 data points
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    DATA PANGAEA
  • 3
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    Geochemical and geomicrobiological data from gravity core MSM21/4_657-1 (2019)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: This gravity corer was taken in the methane seep area off northwestern Svalbard at the gas hydrate stability limit. Sediment was sampled to determine solutes of sediment porewater, sediment wet and dry parameters and microbial activity (sulfate reduction and anaerobic oxidation of methane).
    Keywords: Alkalinity, total; Ammonium; Bromide; Calcium carbonate; Carbon, inorganic, total; Carbon, organic, total; Carbon, total; Carbon/Nitrogen ratio; Chloride; Density; DEPTH, sediment/rock; GC; Geochemistry; Gravity corer; hydrates; Hydrogen sulfide; Maria S. Merian; Methane; Methane, oxidation rate, anaerobic; methane oxidation; MSM21/4; MSM21/4_657-1; Nitrite; Nitrogen, organic; North Greenland Sea; Porosity; Sulfate; Sulfate reduction rate; Sulfur, total; Svalbard; δ18O
    Type: Dataset
    Format: text/tab-separated-values, 289 data points
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    DATA PANGAEA
  • 4
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    Element Partitioning in Brachiopods – Implications for Proxy Use and Biomineralisation (2019)
    In:  [Talk] In: Goldschmidt Conference 2019, 18.-23.08.2019, Barcelona, Spain .
    Details
    Publication Date: 2019-10-28
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 5
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    Boron isotope systematics of cultured brachiopods: response to acidification, vital effects and implications for palaeo-pH reconstruction (2019)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 248 . pp. 370-386.
    Details
    Publication Date: 2022-01-31
    Description: CO2-induced ocean acidification and associated decrease of seawater carbonate saturation state contributed to multiple environmental crises in Earth’s history, and currently poses a major threat for marine calcifying organisms. Owing to their high abundance and good preservation in the Phanerozoic geological record, brachiopods present an advantageous taxon of marine calcifiers for palaeo-proxy applications as well as studies on biological mechanism to cope with environmental change. To investigate the geochemical and physiological responses of brachiopods to prolonged low-pH conditions we cultured Magellania venosa, Terebratella dorsata and Pajaudina atlantica under controlled experimental settings over a period of more than two years. Our experiments demonstrate that brachiopods form their calcite shells under strong biological control, which enables them to survive and grow under low-pH conditions and even in seawater strongly undersaturated with respect to calcite (pH = 7.35, Ωcal = 0.6). Using boron isotope (δ11B) systematics including MC-ICP-MS as well as SIMS analyses, validated against in vivo microelectrode measurements, we show that this resilience is achieved by strict regulation of the calcifying fluid pH between the epithelial mantle and the shell. We provide a culture-based δ11B−pH calibration, which as a result of the internal pH regulatory mechanisms deviates from the inorganic borate ion to pH relationship, but confirms a clear yet subtle pH dependency for brachiopods. At a micro-scale level, the incorporation of 11B appears to be principally driven by a physiological gradient across the shell, where the δ11B values of the innermost calcite record the internal calcifying fluid pH while the composition of the outermost layers is also influenced by seawater pH. These findings are of consequence to studies on biomineralisation processes, physiological adaptations as well as past climate reconstructions.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1016/j.gca.2019.01.015
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Mapping the Surface Microbiome and Metabolome of Brown Seaweed Fucus vesiculosus by Amplicon Sequencing, Integrated Metabolomics and Imaging Techniques (2019)
    Nature Research
    In:  Scientific Reports, 9 (1061).
    Details
    Publication Date: 2022-01-31
    Description: the brown alga Fucus vesiculosus is a keystone marine species, which is subject to heavy surface colonisation. this study was designed to analyse the surface epibiome of F. vesiculosus in conjunction with the composition and spatial distribution of its surface metabolome. the amplicon sequencing, seM and CARD-FIsH imaging studies showed Alphaproteobacteria to predominate the epibiotic bacteria. Fungi of the class Eurotiomycetes were visualised for the first time on an algal surface. An untargeted metabolomics approach using molecular networks, in silico prediction and manual dereplication showed the differential metabolome of the surface and the whole tissue extracts. In total, 50 compounds were putatively dereplicated by UPLC-MS/MS, 37 of which were previously reported from both seaweeds and microorganisms. Untargeted spatial metabolomics by DESI-Imaging MS identified the specific localisation and distribution of various primary and secondary metabolites on surface imprints and in algal cross sections. The UPLC-MS, DESI-IMS and NMR analyses failed to confirm the presence of any surface-associated metabolite, except for mannitol, which were previously reported from F. vesiculosus. This is the first study analysing the seaweed surface microbiome in conjunction with untargeted surface metabolomics and spatial metabolomics approaches.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/s41598-018-37914-8
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Endolithic Algae Affect Modern Coral Carbonate Morphology and Chemistry (2019)
    Frontiers
    In:  Frontiers in Earth Science, 7 (304).
    Details
    Publication Date: 2022-01-31
    Description: While burial diagenetic processes of tropical corals are well investigated, current knowledge about factors initiating early diagenesis remains fragmentary. In the present study, we focus on recent Porites microatolls, growing in the intertidal zone. This growth form represents a model organism for elevated sea surface temperatures (SSTs) and provides important but rare archives for changes close to the seawater/atmosphere interface with exceptional precision on sea level reconstruction. As other coral growth forms, microatolls are prone to the colonization by endolithic green algae. In this case, the algae can facilitate earliest diagenetic alteration of the coral skeleton. Algae metabolic activity not only results in secondary coral porosity due to boring activities, but may also initiate reprecipitation of secondary aragonite within coral pore space, a process not exclusively restricted to microatoll settings. In the samples of this initial study, we quantified a mass transfer from primary to secondary aragonite of around 4% within endolithic green algae bands. Using δ18O, δ13C, Sr/Ca, U/Ca, Mg/Ca, and Li/Mg systematics suggests that the secondary aragonite precipitation followed abiotic precipitation principles. According to their individual distribution coefficients, the different isotope and element ratios showed variable sensitivity to the presence of secondary aragonite in bulk samples, with implications for microatoll-based SST reconstructions. The secondary precipitates formed on an organic template, presumably originating from endolithic green algae activity. Based on laboratory experiments with the green algae Ostreobium quekettii, we propose a conceptual model that secondary aragonite formation is potentially accelerated by an active intracellular calcium transport through the algal thallus from the location of dissolution into coral pore spaces. The combined high-resolution imaging and geochemical approach applied in this study shows that endolithic algae can possibly act as a main driver for earliest diagenesis of coral aragonite starting already during a coral’s life span.
    Type: Article , PeerReviewed
    Format: text
    Format: other
    DOI: 10.3389/feart.2019.00304
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Boron isotope composition of the cold-water coral Lophelia pertusa along the Norwegian margin: Zooming into a potential pH-proxy by combining bulk and high-resolution approaches (2019)
    Elsevier
    Details
    Publication Date: 2024-03-22
    Description: High-latitude cold-water coral reefs are particularly vulnerable to climate change due to enhanced CO2 uptake in these regions. To evaluate their physiological functioning and potential application as pH archives, we retrieved both recent and fossil samples of Lophelia pertusa along the Norwegian margin from Oslofjord (59°N), over to Trondheimsfjord, Sula and Lopphavet (70.6°N). Boron isotope analyses (δ11B) were undertaken using solution-based and laser ablation multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS; LA-ICP-MS), and secondary ion mass spectrometry (SIMS). Epi-fluorescence microscopy was employed to provide a rapid pre-screening routine for structure-specific subsampling in the coral skeleton. This integrated approach enabled us to assess heterogeneities within single specimens, as well as to investigate the role of local environmental influences including recent and past variations. All three mass spectrometry methods show substantial differences in the δ11B of the theca wall (TW) and the centres of calcification (COC's). Micro-bulk subsamples milled from the theca wall of modern specimens originating from different habitats but with comparable seawater pH (8–8.16) gave consistent δ11B values averaging 26.7 (±0.2‰, 2σ, n = 4), while COC subsamples systematically deviated towards lower B/Ca (by ~40%) and depleted δ11B values (minimum 22.7 ± 0.3‰, 2σ), implying a difference of at least 4‰ between TW and COC. SIMS and LA-ICP-MS measurements identified much larger internal heterogeneities with maximum variation of ~10‰ between the distinct skeletal structures; minimal SIMS δ11B values of ~17.3 ± 1.2‰ (2σ) were associated with the pure COC material. Our findings may be interpreted in terms of the occurrence of two main, but likely different, biomineralisation mechanisms in L. pertusa, with the COC's generally exhibiting minimal pH up-regulation, potentially supporting the use of bicarbonate in the early stages of biomineralisation. Furthermore, we highlight the potential utility of L. pertusa for palaeo-proxy studies if targeting the compositionally homogenous TW zones devoid of COC admixtures, which appear to provide highly reproducible measurements.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Endolithic Algae Affect Modern Coral Carbonate Morphology and Chemistry (2019)
    Frontiers Media S.A.
    In:  EPIC3Frontiers in Earth Science, Frontiers Media S.A., 7(304), ISSN: 2296-6463
    Details
    Publication Date: 2019-12-13
    Description: While burial diagenetic processes of tropical corals are well investigated, current knowledge about factors initiating early diagenesis remains fragmentary. In the present study, we focus on recent Porites microatolls, growing in the intertidal zone. This growth form represents a model organism for elevated sea surface temperatures (SSTs) and provides important but rare archives for changes close to the seawater/atmosphere interface with exceptional precision on sea level reconstruction. As other coral growth forms, microatolls are prone to the colonization by endolithic green algae. In this case, the algae can facilitate earliest diagenetic alteration of the coral skeleton. Algae metabolic activity not only results in secondary coral porosity due to boring activities, but may also initiate reprecipitation of secondary aragonite within coral pore space, a process not exclusively restricted to microatoll settings. In the samples of this initial study, we quantified a mass transfer from primary to secondary aragonite of around 4% within endolithic green algae bands. Using δ18O, δ13C, Sr/Ca, U/Ca, Mg/Ca, and Li/Mg systematics suggests that the secondary aragonite precipitation followed abiotic precipitation principles. According to their individual distribution coefficients, the different isotope and element ratios showed variable sensitivity to the presence of secondary aragonite in bulk samples, with implications for microatoll-based SST reconstructions. The secondary precipitates formed on an organic template, presumably originating from endolithic green algae activity. Based on laboratory experiments with the green algae Ostreobium quekettii, we propose a conceptual model that secondary aragonite formation is potentially accelerated by an active intracellular calcium transport through the algal thallus from the location of dissolution into coral pore spaces. The combined high-resolution imaging and geochemical approach applied in this study shows that endolithic algae can possibly act as a main driver for earliest diagenesis of coral aragonite starting already during a coral’s life span.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 10
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    Boron isotope systematics of cultured brachiopods: response to acidification, vital effects and implications for palaeo-pH reconstruction (2019)
    Elsevier Ltd
    In:  EPIC3Geochimica et Cosmochimica Acta, Elsevier Ltd, 248, pp. 370, ISSN: 0016-7037
    Details
    Publication Date: 2020-06-19
    Description: CO2-induced ocean acidification and associated decrease of seawater carbonate saturation state contributed to multiple environmental crises in Earth’s history, and currently poses a major threat for marine calcifying organisms. Owing to their high abundance and good preservation in the Phanerozoic geological record, brachiopods present an advantageous taxon of marine calcifiers for palaeo-proxy applications as well as studies on biological mechanism to cope with environmental change. To investigate the geochemical and physiological responses of brachiopods to prolonged low-pH conditions we cultured Magellania venosa, Terebratella dorsata and Pajaudina atlantica under controlled experimental settings over a period of more than two years. Our experiments demonstrate that brachiopods form their calcite shells under strong biological control, which enables them to survive and grow under low-pH conditions and even in seawater strongly undersaturated with respect to calcite (pH = 7.35, Ωcal = 0.6). Using boron isotope (δ11B) systematics including MC-ICP-MS as well as SIMS analyses, validated against in vivo microelectrode measurements, we show that this resilience is achieved by strict regulation of the calcifying fluid pH between the epithelial mantle and the shell. We provide a culture-based δ11B−pH calibration, which as a result of the internal pH regulatory mechanisms deviates from the inorganic borate ion to pH relationship, but confirms a clear yet subtle pH dependency for brachiopods. At a micro-scale level, the incorporation of boron appears to be principally driven by a physiological gradient across the shell, where the δ11B values of the innermost calcite record the internal calcifying fluid pH while the composition of the outermost layers is also influenced by seawater pH. These findings are of consequence to studies on biomineralisation processes, physiological adaptations as well as past climate reconstructions.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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    PAPER (OA)
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