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  • 1
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    Respiration of Mediterranean cold-water corals is not affected by ocean acidification as projected for the end of the century (2013)
    Copernicus
    Details
    Publication Date: 2013-05-02
    Description: The rise of CO2 has been identified as a major threat to life in the ocean. About one-third of the anthropogenic CO2 produced in the last 200 yr has been taken up by the ocean, leading to ocean acidification. Surface seawater pH is projected to decrease by about 0.4 unit between the pre-industrial revolution and 2100. The branching cold-water corals Madrepora oculata and Lophelia pertusa are important, habitat-forming species in the deep Mediterranean Sea. Although previous research has investigated the abundance and distribution of these species, little is known regarding their ecophysiology and potential responses to global environmental change. A previous study indicated that the rate of calcification of these two species remained constant up to 1000 μatm CO2 a value that is at the upper end of changes projected to occur by 2100. We examined whether the ability to maintain calcification rates in the face of rising pCO2 affected the energetic requirements of these corals. Over the course of three months, rates of respiration were measured at a pCO2 ranging between 350 and 1100 μatm to distinguish between short-term response and longer-term acclimation. Respiration rates ranged from 0.074 to 0.266 μmol O2 (g skeletal dry weight)−1 h−1 and 0.095 to 0.725 μmol O2 (g skeletal dry weight)−1 h−1 for L. and M. oculata, respectively, and were independent of pCO2. Respiration increased with time likely due to regular feeding which may have provided an increased energy supply to sustain coral metabolism. Future studies are needed to confirm whether the insensitivity of respiration to increasing pCO2 is a general feature of deep-sea corals in other regions.
    Print ISSN: 1810-6277
    Electronic ISSN: 1810-6285
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 2
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    Respiration of Mediterranean cold-water corals is not affected by ocean acidification as projected for the end of the century (2013)
    Copernicus
    Details
    Publication Date: 2013-08-27
    Description: The rise of CO2 has been identified as a major threat to life in the ocean. About one-third of the anthropogenic CO2 produced in the last 200 yr has been taken up by the ocean, leading to ocean acidification. Surface seawater pH is projected to decrease by about 0.4 units between the pre-industrial revolution and 2100. The branching cold-water corals Madrepora oculata and Lophelia pertusa are important, habitat-forming species in the deep Mediterranean Sea. Although previous research has investigated the abundance and distribution of these species, little is known regarding their ecophysiology and potential responses to global environmental change. A previous study indicated that the rate of calcification of these two species remained constant up to 1000 μatm CO2, a value that is at the upper end of changes projected to occur by 2100. We examined whether the ability to maintain calcification rates in the face of rising pCO2 affected the energetic requirements of these corals. Over the course of three months, rates of respiration were measured at a pCO2 ranging between 350 and 1100 μatm to distinguish between short-term response and longer-term acclimation. Respiration rates ranged from 0.074 to 0.266 μmol O2 (g skeletal dry weight)−1 h−1 and 0.095 to 0.725 μmol O2 (g skeletal dry weight)−1 h−1 for L. pertusa and M. oculata, respectively, and were independent of pCO2. Respiration increased with time likely due to regular feeding, which may have provided an increased energy supply to sustain coral metabolism. Future studies are needed to confirm whether the insensitivity of respiration to increasing pCO2 is a general feature of deep-sea corals in other regions.
    Print ISSN: 1726-4170
    Electronic ISSN: 1726-4189
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 3
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    Geochemistry of surface sediment samples from the equatorial Atlantic south of the Azores
    PANGAEA
    In:  Supplement to: Auffret, Gérard A; Richter, Thomas; Reyss, Jean-Louis; Organo, C; Deloule, E; Gaillard, Jean-Francois; Dennielou, Bernard; Müller, C; Thomas, Biji; Watremez, P; Grousset, Francis E; Boelaert, An; Cambon, P; Etoubleau, Joel (1996): Enregistrement de lactivité hydrothermale dans les sédiments de la dorsale médio-atlantique au Sud des Açores. Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science, 323(7), 583-590
    Details
    Publication Date: 2023-05-12
    Description: In order to recognize the distribution of hydrothermal tracers south of the Azores, a series of cores has been sampled during the GEOFAR cruise. The distribution of the Mn concentrations shows that the hydrothermal influence is maximum within and to the north-west of the Lucky Strike segment. North of the East-Azores Fracture Zone the sediments are enriched in Ba which could be derived from different sources. The chemical composition of the interstitial water shows that water advection is limited. Mn, Cu, Ni fluxes evaluated in one site have increased during isotopic stages 4 and 2 and the deglaciation.
    Keywords: Antimony; Arsenic; Barium; BC; Box corer; Calcium carbonate; Chromium; Element analysis, neutron activation (NAA); Event label; GEOFAR; Iron; KB04; KF01; KF03; KF04; KF05; KF07; KF08; KF09; KF10; KF12; KF13; KF14; KF15; KF16; KF17; KF18; KF19; KF20; KF21; KG06; KG20; KS11; KS13; KS14; KS16; Latitude of event; Le Noroit; Longitude of event; Manganese; PC; Piston corer; Scandium; south of Azores
    Type: Dataset
    Format: text/tab-separated-values, 199 data points
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  • 4
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    Seawater carbonate chemistry, nutrients and calcification during experiments with cold-water scleractinian corals (Lophelia pertusa, Madrepora oculata and Desmophyllum dianthus), 2011 (2012)
    PANGAEA
    In:  Supplement to: Maier, Cornelia; Watremez, P; Taviani, Marco; Weinbauer, Markus G; Gattuso, Jean-Pierre (2012): Calcification rates and the effect of ocean acidification on Mediterranean cold-water corals. Proceedings of the Royal Society B-Biological Sciences, 279(1734), 1716-1723, https://doi.org/10.1098/rspb.2011.1763
    Details
    Publication Date: 2024-03-15
    Description: Global environmental changes, including ocean acidification, have been identified as a major threat to scleractinian corals. General predictions are that ocean acidification will be detrimental to reef growth and that 40 to more than 80 per cent of present-day reefs will decline during the next 50 years. Cold-water corals (CWCs) are thought to be strongly affected by changes in ocean acidification owing to their distribution in deep and/or cold waters, which naturally exhibit a CaCO3 saturation state lower than in shallow/warm waters. Calcification was measured in three species of Mediterranean cold-water scleractinian corals (Lophelia pertusa, Madrepora oculata and Desmophyllum dianthus) on-board research vessels and soon after collection. Incubations were performed in ambient sea water. The species M. oculata was additionally incubated in sea water reduced or enriched in CO2. At ambient conditions, calcification rates ranged between -0.01 and 0.23% d-1. Calcification rates of M. oculata under variable partial pressure of CO2 (pCO2) were the same for ambient and elevated pCO2 (404 and 867 µatm) with 0.06 ± 0.06% d-1, while calcification was 0.12 ± 0.06% d-1 when pCO2 was reduced to its pre-industrial level (285 µatm). This suggests that present-day CWC calcification in the Mediterranean Sea has already drastically declined (by 50%) as a consequence of anthropogenic-induced ocean acidification.
    Keywords: AIRICA analyzer (Miranda); Alkalinity, total; Alkalinity, total, standard deviation; Alkalinity anomaly technique (Smith and Key, 1975); Ammonium; Ammonium, standard deviation; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate; Calcification rate, standard deviation; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cnidaria; Coral polyp; Coral polyp, standard deviation; Deep-sea; Desmophyllum sp.; Desmophyllum sp., dry weight; Desmophyllum sp., dry weight, standard deviation; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experiment day; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; Laboratory experiment; Lophelia pertusa; Lophelia pertusa, tissue, dry weight; Lophelia pertusa, tissue, dry weight, standard error; Madrepora oculata; Madrepora oculata, dry weight; Madrepora oculata, dry weight, standard deviation; Measured; Mediterranean Sea; Metrohm Titrando titrator; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Phosphate; Phosphate, standard deviation; Replicates; Salinity; Single species; Site; Species; Temperate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 608 data points
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