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  • 2020-2024  (24)
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  • 1
    Keywords: Deep sea corals ; Coral reefs and islands
    Type of Medium: Book
    Pages: xvi, 334, 16 ungezählte Seiten , Illustrationen
    ISBN: 9781009263931 , 9780521884853
    DDC: 593.617789
    RVK:
    Language: English
    Note: Originally published: 2009 , Includes bibliographical references and index
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  • 2
    Publication Date: 2023-09-21
    Description: The Central and South Atlantic represents a vast ocean area and is home to a diverse range of ecosystems and species. Nevertheless, and similar to the rest of the global south, the area is comparatively understudied yet exposed to increasing levels of multisectoral pressures. To counteract this, the level of scientific exploration in the Central and South Atlantic has increased in recent years and will likely continue to do so within the context of the United Nations (UN) Decade of Ocean Science for Sustainable Development. Here, we compile the literature to investigate the distribution of previous scientific exploration of offshore (30 m+) ecosystems in the Central and South Atlantic, both within and beyond national jurisdiction, allowing us to synthesise overall patterns of biodiversity. Furthermore, through the lens of sustainable management, we have reviewed the existing anthropogenic activities and associated management measures relevant to the region. Through this exercise, we have identified key knowledge gaps and undersampled regions that represent priority areas for future research and commented on how these may be best incorporated into, or enhanced through, future management measures such as those in discussion at the UN Biodiversity Beyond National Jurisdiction negotiations. This review represents a comprehensive summary for scientists and managers alike looking to understand the key topographical, biological, and legislative features of the Central and South Atlantic.
    Type: Book chapter , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2023-02-08
    Description: Reefs formed by scleractinian cold-water corals represent unique biodiversity hot spots in the deep sea, preferring aphotic water depths of 200–1000 m. The distribution of the most prominent reef-building species Lophelia pertusa is controlled by various environmental factors including dissolved oxygen concentrations and temperature. Consequently, the expected ocean deoxygenation and warming triggered by human-induced global change are considered as a serious threat to cold-water coral reefs. Here, we present results on recently discovered reefs in the SE Atlantic, where L. pertusa thrives in hypoxic and rather warm waters. This sheds new light on its capability to adapt to extreme conditions, which is facilitated by high surface ocean productivity, resulting in extensive food supply. Putting our data in an Atlantic-wide perspective clearly demonstrates L. pertusa’s ability to develop population-specific adaptations, which are up to now hardly considered in assessing its present and future distributions.
    Type: Article , PeerReviewed
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  • 4
    Publication Date: 2024-02-07
    Description: The three-dimensional (3D) structure of habitat-forming corals has profound impacts on reef ecosystem processes. Elucidating coral structural responses to the environment is therefore crucial to understand changes in these ecosystems. However, little is known of how environmental factors shape coral structure in deep and dark waters, where cold-water coral (CWC) reefs thrive. Here, we attempt to infer the influence of current flow on CWC framework architecture, using 3D scanning to quantify colony shape traits (volume compactness and surface complexity) in the reef-building CWC Desmophyllum pertusum from adjacent fjord and offshore habitats with contrasting flow regimes. We find substantial architectural variability both between and within habitats. We show that corals are generally more compact in the fjord habitat, reflecting the prevailing higher current speeds, although differences in volume compactness between fjord and offshore corals are more subtle when comparing the fjord with the more exposed side of the offshore setting, probably due to locally intensified currents. Conversely, we observe no clear disparity in coral surface complexity between habitats (despite its positive correlation with volume compactness), suggesting it is not affected by current speed. Unlike volume compactness, surface complexity is similarly variable within a single colony as it is between colonies within the same habitat or between habitats and is therefore perhaps more dependent than volume compactness on microenvironmental conditions. These findings suggest a highly plastic, trait-specific and functionally relevant structural response of CWCs to current flow and underscore the importance of multiple concurrent sources of hydrodynamic forcing on CWC growth.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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  • 5
    Publication Date: 2024-03-21
    Description: Hyrrokkin sarcophaga is a parasitic foraminifera that is commonly found in cold-water coral reefs where it infests the file clam Acesta excavata and the scleractinian coral Desmophyllum pertusum (formerly known as Lophelia pertusa). Here, we present measurements of the trace element and isotopic composition of these parasitic foraminifera, analyzed by inductively coupled optical emission spectrometry (ICP-OES), electron probe microanalysis (EPMA) and mass spectrometry (gas-source MS and inductively-coupledplasma MS). Our results reveal that the geochemical signature of H. sarcophaga depends on the host organism it infests. Sr / Ca ratios are 1.1 mmol mol 1 higher in H. sarcophaga that infest D. pertusum, which could be an indication that dissolved host carbonate material is utilized in shell calcification, given that the aragonite of D. pertusum has a naturally higher Sr concentration compared to the calcite of A. excavata. Similarly, we measure 3.1 parts per thousand lower delta C-13 and 0.25 parts per thousand lower delta O-18 values in H. sarcophaga that lived on D. pertusum, which might be caused by the direct uptake of the host's carbonate material with a more negative isotopic composition or different pH regimes in these foraminifera (pH can exert a control on the extent of CO2 hydration/hydroxylation) due to the uptake of body fluids of the host. We also observe higher Mn / Ca ratios in foraminifera that lived on A. excavata but did not penetrate the host shell compared to specimen that penetrated the shell, which could be interpreted as a change in food source, changes in the calcification rate, Rayleigh fractionation or changing oxygen conditions. While our measurements provide an interesting insight into the calcification process of this unusual foraminifera, these data also indicate that the geochemistry of this parasitic foraminifera is unlikely to be a reliable indicator of paleoenvironmental conditions using Sr / Ca, Mn / Ca, delta O-18 or delta C-13 unless the host organism is known and its geochemical composition can be accounted for.
    Type: Article , PeerReviewed
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    Format: archive
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  • 6
    Publication Date: 2023-03-13
    Description: Swiftia phaeton, a new species, is described for Mauritania where it is endemic at the upper bathyal. This azooxanthellate octocoral is distinctive from congeneric species in the NE Atlantic and Mediterranean Sea by the dark red coloration of the colonies and polyps, the presence of a layer of rod sclerites on top of the calyces and different sizes of polyps and sclerites. Coral gardens dominated by a species of the genus Swiftia Duchassaing & Michelotti, 1864 were filmed for the first time it the southern NE Atlantic Ocean. The extensive Swiftia phaeton sp. nov. dominated habitats were recorded during the Phaeton expedition onboard Maria S. Merian in 2010 at the Mauritanian Slope between 20°24N and 17°54N in 470 - 640 m depth, co-occurring with the framework-forming scleractinians Lophelia pertusa (Linnaeus, 1758) and Madrepora oculata (Linnaeus, 1758). ROV video annotation based on size and density distribution of Swiftia enabled the characterization of the new biotope.
    Keywords: ATLAS; A Trans-Atlantic assessment and deep-water ecosystem-based spatial management plan for Europe; Coral garden; Mauritania; NW Africa; Octocorallia; Plexauridae; Taxonomy.; vulnerable marine ecosystem (VME).
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 7
    Publication Date: 2023-03-13
    Keywords: Benthic and planktonic foraminifera; Cibicides lobatulus, δ13C; Cibicides lobatulus, δ13C standard deviation; Cibicides lobatulus, δ18O; Cibicides lobatulus, δ18O standard deviation; DATE/TIME; Finnigan MAT 252 gas isotope ratio mass spectrometer with Kiel III automated carbonate preparation device; Greece; Identification; Island of Rhodes, Greece; OUTCROP; Outcrop sample; Rhodes; Rhodes_Lardos_SW_Hill; Sample comment; Sample height; stable oxygen and carbon isotopes; Standard; Taxon/taxa, unique identification; Taxon/taxa, unique identification (URI)
    Type: Dataset
    Format: text/tab-separated-values, 323 data points
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  • 8
    Publication Date: 2023-03-13
    Keywords: Benthic and planktonic foraminifera; Cibicidoides pachyderma, δ13C; Cibicidoides pachyderma, δ13C standard deviation; Cibicidoides pachyderma, δ18O; Cibicidoides pachyderma, δ18O standard deviation; DATE/TIME; Finnigan MAT 252 gas isotope ratio mass spectrometer with Kiel III automated carbonate preparation device; Greece; Identification; Island of Rhodes, Greece; OUTCROP; Outcrop sample; Rhodes; Rhodes_Lardos_SW_Hill; Sample comment; Sample height; stable oxygen and carbon isotopes; Standard; Taxon/taxa, unique identification; Taxon/taxa, unique identification (URI)
    Type: Dataset
    Format: text/tab-separated-values, 775 data points
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  • 9
    Publication Date: 2023-03-13
    Keywords: Benthic and planktonic foraminifera; DATE/TIME; Finnigan MAT 252 gas isotope ratio mass spectrometer with Kiel III automated carbonate preparation device; Globigerinoides ruber white, δ13C; Globigerinoides ruber white, δ13C standard deviation; Globigerinoides ruber white, δ18O; Globigerinoides ruber white, δ18O standard deviation; Greece; Identification; Island of Rhodes, Greece; OUTCROP; Outcrop sample; Rhodes; Rhodes_Lardos_SW_Hill; Sample height; stable oxygen and carbon isotopes; Standard; Taxon/taxa, unique identification; Taxon/taxa, unique identification (URI)
    Type: Dataset
    Format: text/tab-separated-values, 700 data points
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  • 10
    Publication Date: 2023-03-13
    Keywords: Benthic and planktonic foraminifera; DATE/TIME; Finnigan MAT 252 gas isotope ratio mass spectrometer with Kiel III automated carbonate preparation device; Globigerinoides conglobatus, δ13C; Globigerinoides conglobatus, δ13C, standard deviation; Globigerinoides conglobatus, δ18O; Globigerinoides conglobatus, δ18O, standard deviation; Greece; Identification; Island of Rhodes, Greece; OUTCROP; Outcrop sample; Rhodes; Rhodes_Lardos_SW_Hill; Sample height; stable oxygen and carbon isotopes; Standard; Taxon/taxa, unique identification; Taxon/taxa, unique identification (URI)
    Type: Dataset
    Format: text/tab-separated-values, 364 data points
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