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  • 2020-2024  (35)
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  • 1
    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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  • 2
    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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  • 3
    Publication Date: 2023-02-08
    Description: Highlights • Holocene cold-water coral mound formation started non-synchronous in Belgica province. • Coral mounds and slope sediments record changes in intermediate water mass dynamics. • Increased turbulent bottom currents steered slope erosion and mound formation. • Internal waves at the ENAW-MOW boundary enhance energy supply and particle flux. • Transition zone between the ENAW-MOW shifted 250 m upslope during the last deglacial. Abstract Turbulent bottom currents significantly influence the formation of cold-water coral mounds and sedimentation processes on continental slopes. Combining records from coral mounds and adjacent slope sediments therefore provide an unprecedented palaeo-archive to understand past variations of intermediate water-mass dynamics. Here, we present coral ages from coral mounds of the Belgica province (Porcupine Seabight, NE Atlantic), which indicate a non-synchronous Holocene re-activation in mound formation suggested by a temporal offset of ∼2.7 kyr between the deep (start: ∼11.3 ka BP at 950 m depth) and shallow (start: ∼8.6 ka BP at 700 m depth) mounds. A similar depth-dependent pattern is revealed in the slope sediments close to these mounds that become progressively younger from 22.1 ka BP at 990 m to 12.2 ka BP at 740 m depth (based on core-top ages). We suggest that the observed changes are the consequence of enhanced bottom-water hydrodynamics, caused by internal waves associated to the re-invigoration of the Mediterranean Outflow Water (MOW) and the development of a transition zone (TZ) between the MOW and the overlying Eastern North Atlantic Water (ENAW), which established during the last deglacial. These highly energetic conditions induced erosion adjacent to the Belgica mounds and supported the re-initiation of mound formation by increasing food and sediment fluxes. The striking depth-dependent patterns are likely linked to a shift of the ENAW-MOW-TZ, moving the level of maximum energy ∼250 m upslope since the onset of the last deglaciation.
    Type: Article , PeerReviewed
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  • 4
    Publication Date: 2024-02-07
    Description: Highlights: • The cold-water coral Desmophyllum pertusum from reefs off Angola showed the same respiration rates at hypoxic and normoxic oxygen concentration. • The respiration rates measured are in the same order of magnitude as those previously observed for the species under normoxic conditions in other areas. Abstract: Large, well-developed and flourishing reefs dominated by the cold-water coral Desmophyllum pertusum have recently been discovered along the Angola margin in the southeastern Atlantic Ocean living under very low oxygen concentrations (0.6–1.5 mL L−1). This study assessed the respiration rates of this coral in a short-term (10 days) aquarium experiment under naturally low oxygen concentrations (1.4 ± 0.5 mL L−1) as well as under saturated oxygen concentrations (6.1 ± 0.6 mL L−1). We found no significant difference in respiration rates between the two oxygen concentrations. Furthermore, the respiration rates of D. pertusum were in the same order of magnitude as those of the same species living under normoxic conditions in other areas. This work expands the current knowledge on the metabolic activity of cold-water corals under hypoxic conditions, evidencing that low oxygen conditions are not a general limiting factor for the overall distribution of D. pertusum.
    Type: Article , PeerReviewed
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  • 5
    Publication Date: 2023-08-16
    Description: Table 5. AMS radiocarbon (14C) dates determined on multi-species samples of planktonic foraminifera from four off-mound sediment cores. The AMS 14C ages were corrected for 13C and calibrated using the MARINE13 calibration curve (Reimer et al., 2013) of the CALIB7.1 software (Stuiver and Reimer, 1993) without any additional local reservoir age correction. Estimated sedimentation rates are supplemented.
    Keywords: 14C; Age, dated; Age, dated standard deviation; Belgica coral mound province; Belgica Mounds; Calendar age, maximum/old; Calendar age, minimum/young; Center for Marine Environmental Sciences; DEPTH, sediment/rock; Elevation of event; Event label; GC; GeoB14504-1; GeoB14505-1; GeoB14506-1; GeoB14507-1; Gravity corer; Laboratory code/label; Latitude of event; Longitude of event; MARUM; Median probability age; NE Atlantic; off-mound cores; POS400; Poseidon; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 81 data points
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  • 6
    Publication Date: 2023-09-21
    Description: This data presents high precision Th/U ages from cold-water corals obtained from sediment cores up to 70 m long and collected by the sea floor drill rig MARUM-MeBo70 in the western Mediterranean Sea. The drill records provided new insights into the initiation of the Mediterranean coral mounds as the base of the 60-m-high Dragon mound was penetrated and dated to the Mid-Pleistocene (~390 ka). The coral ages document mound development pulses, which are remarkably coherent with precession-driven changes in African hydroclimate. The data supports studies on the relevance of past changes in continental hydroclimate and their implications on oceanic processes including the complex processes leading to the aggradation of cold-water coral mounds.
    Keywords: Alboran Sea; Center for Marine Environmental Sciences; cold-water corals; MARUM; Mediterranean Sea; Th-U ages
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 7
    Publication Date: 2024-02-02
    Keywords: Age, 230Th/U Thorium-Uranium, corrected, using the decay constants by Cheng et al. (2013); Age, dated; Age, dated material; Age, dated standard deviation; Alboran Sea; Alboran Sea - E-Melilla - Brittlestar Ridge I; Center for Marine Environmental Sciences; cold-water corals; DEPTH, sediment/rock; GeoB18118-2; Laboratory code/label; Maria S. Merian; MARUM; MeBo70; Mediterranean Sea; MSM36; Sample code/label; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Th-U ages; Uranium-238; Uranium-238, standard deviation; Uranium-thorium isotope dilution measurement by MC-ICPMS; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 836 data points
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  • 8
    Publication Date: 2024-02-02
    Keywords: Age, 230Th/U Thorium-Uranium, corrected, using the decay constants by Cheng et al. (2013); Age, dated; Age, dated material; Age, dated standard deviation; Alboran Sea; Alboran Sea - E-Melilla - Dragon Mound; Center for Marine Environmental Sciences; cold-water corals; DEPTH, sediment/rock; GeoB18116-2; Laboratory code/label; Maria S. Merian; MARUM; MeBo70; Mediterranean Sea; MSM36; Sample code/label; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Th-U ages; Uranium-238; Uranium-238, standard deviation; Uranium-thorium isotope dilution measurement by MC-ICPMS; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1424 data points
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  • 9
    Publication Date: 2024-02-27
    Description: Cold-water corals are the engineers of complex ecosystems forming unique biodiversity hot spots in the deep sea. They are expected to suffer dramatically from future environmental changes in the oceans such as ocean warming, food depletion, deoxygenation and acidification. However, during the instrumental era no collapse of a cold-water coral ecosystem is documented, leaving quite some uncertainty on their sensitivity to these environmental stressors. Paleoceanographic reconstructions offer the opportunity to align the on- and offsets of cold-water coral proliferation to environmental parameters. Here, we present the synthesis of six case studies from the North Atlantic Ocean and the Mediterranean Sea revealing that food supply controlled by export production and turbulent hydrodynamics at the seabed exerted the strongest impact on coral vitality during the past 20,000 years, whereas locally low oxygen concentrations in the bottom-water can act as an additional relevant stressor. The fate of cold-water corals in a changing ocean will largely depend on how these oceanographic processes will be modulated. Future ocean deoxygenation may be compensated regionally where the food delivery and food quality are optimal.
    Keywords: ATLAS; A Trans-Atlantic assessment and deep-water ecosystem-based spatial management plan for Europe; benthic foraminiferal stable isotopes and Mg/Ca; bottom-water oxygenation; bottom-water temperature; climatic change; cold-water corals; Grain-size analyses; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Mediterranean Sea; North Atlantic Ocean
    Type: Dataset
    Format: application/zip, 11 datasets
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  • 10
    Publication Date: 2024-02-27
    Keywords: 1052-1; AGE; ATLAS; A Trans-Atlantic assessment and deep-water ecosystem-based spatial management plan for Europe; benthic foraminiferal stable isotopes and Mg/Ca; bottom-water oxygenation; bottom-water temperature; climatic change; cold-water corals; DEPTH, sediment/rock; GC; GeoB14885-1; Grain-size analyses; Gravity corer; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Maria S. Merian; Mediterranean Sea; MSM16/3; North Atlantic Ocean; Planulina ariminensis, δ18O; Timiris coral mound chain
    Type: Dataset
    Format: text/tab-separated-values, 21 data points
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