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  • PANGAEA  (10)
  • AGU (American Geophysical Union)  (2)
  • British Ecological Society  (1)
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  • 1
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    Benthic marine calcifiers coexist with CaCO3-undersaturated seawater worldwide (2016)
    AGU (American Geophysical Union) | Wiley
    In:  Global Biogeochemical Cycles, 30 (7). pp. 1038-1053.
    Details
    Publication Date: 2020-06-29
    Description: Ocean acidification and decreasing seawater saturation state with respect to calcium carbonate (CaCO3) minerals have raised concerns about the consequences to marine organisms that build CaCO3 structures. A large proportion of benthic marine calcifiers incorporate Mg2+ into their skeletons (Mg-calcite), which, in general, reduces mineral stability. The relative vulnerability of some marine calcifiers to ocean acidification appears linked to the relative solubility of their shell or skeletal mineralogy, although some organisms have sophisticated mechanisms for constructing and maintaining their CaCO3 structures causing deviation from this dependence. Nevertheless, few studies consider seawater saturation state with respect to the actual Mg-calcite mineralogy (ΩMg-x) of a species when evaluating the effect of ocean acidification on that species. Here, a global dataset of skeletal mole % MgCO3 of benthic calcifiers and in situ environmental conditions spanning a depth range of 0 m (subtidal/neritic) to 5600 m (abyssal) was assembled to calculate in situ ΩMg-x. This analysis shows that 24% of the studied benthic calcifiers currently experience seawater mineral undersaturation (ΩMg-x 〈 1). As a result of ongoing anthropogenic ocean acidification over the next 200 to 3000 years, the predicted decrease in seawater mineral saturation will expose approximately 57% of all studied benthic calcifying species to seawater undersaturation. These observations reveal a surprisingly high proportion of benthic marine calcifiers exposed to seawater that is undersaturated with respect to their skeletal mineralogy, underscoring the importance of using species-specific seawater mineral saturation states when investigating the impact of CO2-induced ocean acidification on benthic marine calcification.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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  • 2
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    Sinking of Gelatinous Zooplankton Biomass Increases Deep Carbon Transfer Efficiency Globally (2019)
    AGU (American Geophysical Union) | Wiley
    In:  Global Biogeochemical Cycles, 33 (12). pp. 1764-1783.
    Details
    Publication Date: 2022-01-31
    Description: Gelatinous zooplankton (Cnidaria, Ctenophora, and Urochordata, namely, Thaliacea) are ubiquitous members of plankton communities linking primary production to higher trophic levels and the deep ocean by serving as food and transferring “jelly‐carbon” (jelly‐C) upon bloom collapse. Global biomass within the upper 200 m reaches 0.038 Pg C, which, with a 2–12 months life span, serves as the lower limit for annual jelly‐C production. Using over 90,000 data points from 1934 to 2011 from the Jellyfish Database Initiative as an indication of global biomass (JeDI: http://jedi.nceas.ucsb.edu, http://www.bco‐dmo.org/dataset/526852), upper ocean jelly‐C biomass and production estimates, organism vertical migration, jelly‐C sinking rates, and water column temperature profiles from GLODAPv2, we quantitatively estimate jelly‐C transfer efficiency based on Longhurst Provinces. From the upper 200 m production estimate of 0.038 Pg C year−1, 59–72% reaches 500 m, 46–54% reaches 1,000 m, 43–48% reaches 2,000 m, 32–40% reaches 3,000 m, and 25–33% reaches 4,500 m. This translates into ~0.03, 0.02, 0.01, and 0.01 Pg C year−1, transferred down to 500, 1,000, 2,000, and 4,500 m, respectively. Jelly‐C fluxes and transfer efficiencies can occasionally exceed phytodetrital‐based sediment trap estimates in localized open ocean and continental shelves areas under large gelatinous blooms or jelly‐C mass deposition events, but this remains ephemeral and transient in nature. This transfer of fast and permanently exported carbon reaching the ocean interior via jelly‐C constitutes an important component of the global biological soft‐tissue pump, and should be addressed in ocean biogeochemical models, in particular, at the local and regional scale.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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  • 3
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    Foraging under extreme events: Contrasting adaptations by benthic macrofauna to drastic biogeochemical disturbance (2023)
    British Ecological Society
    Details
    Publication Date: 2024-02-07
    Description: 1. Hydrothermal vent systems are important biodiversity hotspots that host a vast array of unique species and provide information on life's evolutionary adaptations to extreme environments. However, these habitats are threatened by both human exploitation and extreme natural events, both of which can rapidly disrupt the delicate balance of the food webs found in these systems. This is particularly true for shallow vent endemic animals due to their limited dietary niche and specialized adaptations to specific biogeochemical conditions. 2. In this study, we used the shallow hydrothermal vents of Kueishantao off the coast of Taiwan as a natural laboratory to examine the response of a benthic food web to a M5.8 earthquake and a C5 typhoon that led to a two-year “near shutdown” of the vents. These perturbations drastically altered the local biogeochemical cycle and the dietary availability of chemosynthetic versus photosynthetic food resources. 3. Our analysis of multiple stable isotopes, including those of sulphur, carbon, and nitrogen (δ34S, δ13C, and δ15N), from different benthic macrofauna reveals that endemic and non-endemic consumers exhibited different responses to sudden disruption in habitat and biogeochemical cycling. 4. The endemic vent crab, Xenograpsus testudinatus, continued to partially rely on chemosynthetic sulphur bacteria despite photosynthetic sources being the most dominant food source after the disruption. We posit that X. testudinatus has an obligate nutritional dependence on chemoautotrophic sources because the decrease in chemoautotrophic production was accompanied by a dramatic decrease in the abundance of X. testudinatus. The population decline rate was ~19 individuals per m2 per year before the perturbation, but the decline rate increased to 40 individuals per m2 per year after the perturbation. In contrast, the non-endemic gastropods exhibited much greater dietary plasticity that tracked the overall abundance of photo- and chemo-synthetic dietary sources. 5. The catastrophic events in shallow hydrothermal vent ecosystem presented a novel opportunity to examine dietary adaptations among endemic and non-endemic benthic macrofauna in response to altered biogeochemical cycling. Our findings highlight the vulnerability of benthic specialists to the growing environmental pressures exerted by human activities worldwide.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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  • 4
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    Jelly biomass sinking speed reveals a fast carbon export mechanism (2014)
    PANGAEA
    In:  Supplement to: Lebrato, Mario; Molinero, Juan-Carlos; Cartes, Joan E; Lloris, Domingo; Melin, Frederic; Beni-Casadella, Laia (2013): Sinking Jelly-Carbon Unveils Potential Environmental Variability along a Continental Margin. PLoS ONE, 8(12), e82070, https://doi.org/10.1371/journal.pone.0082070
    Details
    Publication Date: 2023-10-28
    Description: Particulate matter export fuels benthic ecosystems in continental margins and the deep sea, removing carbon from the upper ocean. Gelatinous zooplankton biomass provides a fast carbon vector that has been poorly studied. Observational data of a large-scale benthic trawling survey from 1994 to 2005 provided a unique opportunity to quantify jelly-carbon along an entire continental margin in the Mediterranean Sea and to assess potential links with biological and physical variables. Biomass depositions were sampled in shelves, slopes and canyons with peaks above 1000 carcasses per trawl, translating to standing stock values between 0.3 and 1.4 mg C m2 after trawling and integrating between 30,000 and 175,000 m2 of seabed. The benthopelagic jelly-carbon spatial distribution from the shelf to the canyons may be explained by atmospheric forcing related with NAO events and dense shelf water cascading, which are both known from the open Mediterranean. Over the decadal scale, we show that the jelly-carbon depositions temporal variability paralleled hydroclimate modifications, and that the enhanced jelly-carbon deposits are connected to a temperature-driven system where chlorophyll plays a minor role. Our results highlight the importance of gelatinous groups as indicators of large-scale ecosystem change, where jelly-carbon depositions play an important role in carbon and energy transport to benthic systems.
    Keywords: Abundance; Abundance per area; Area; Area/locality; Biomass; Biomass as carbon per area; Biomass as nitrogen per area; Bottom trawl; BT; Carbon, organic, particulate; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cornide_1994_81; Cornide_1994_82; Cornide_1995_2; Cornide_1995_30; Cornide_1995_36; Cornide_1995_38; Cornide_1995_39; Cornide_1995_48; Cornide_1995_50; Cornide_1995_51; Cornide_1995_53; Cornide_1995_54; Cornide_1995_55; Cornide_1995_70; Cornide_1995_71; Cornide_1996_105; Cornide_1996_106; Cornide_1996_12; Cornide_1996_18; Cornide_1996_20; Cornide_1996_24; Cornide_1996_31; Cornide_1996_32; Cornide_1996_33; Cornide_1996_34; Cornide_1996_35; Cornide_1996_36; Cornide_1996_37; Cornide_1996_38; Cornide_1996_39; Cornide_1996_41; Cornide_1996_42; Cornide_1996_43; Cornide_1996_50; Cornide_1996_52; Cornide_1996_53; Cornide_1996_54; Cornide_1996_55; Cornide_1996_56; Cornide_1996_57; Cornide_1996_58; Cornide_1996_59; Cornide_1996_60; Cornide_1996_62; Cornide_1996_63; Cornide_1996_64; Cornide_1996_67; Cornide_1996_73; Cornide_1996_74; Cornide_1996_75; Cornide_1996_76; Cornide_1996_78; Cornide_1996_79; Cornide_1996_80; Cornide_1996_83; Cornide_1997_102; Cornide_1997_53; Cornide_1997_54; Cornide_1997_56; Cornide_1997_68; Cornide_1997_73; Cornide_1997_74; Cornide_1997_75; Cornide_1997_78; Cornide_1997_81; Cornide_1998_11; Cornide_1998_12; Cornide_1998_14; Cornide_1998_19; Cornide_1998_48; Cornide_1998_6; Cornide_1999_32; Cornide_1999_47; Cornide_1999_56; Cornide_1999_81; Cornide_2000_10; Cornide_2000_19; Cornide_2000_36; Cornide_2000_6; Cornide_2000_84; Cornide_2000_91; Cornide_2001_106; Cornide_2001_107; Cornide_2001_108; Cornide_2001_11; Cornide_2001_18; Cornide_2001_30; Cornide_2001_32; Cornide_2001_41; Cornide_2001_42; Cornide_2001_43; Cornide_2001_44; Cornide_2001_5; Cornide_2001_51; Cornide_2001_55; Cornide_2001_63; Cornide_2001_64; Cornide_2001_69; Cornide_2001_71; Cornide_2001_85; Cornide_2001_86; Cornide_2002_10; Cornide_2002_100; Cornide_2002_103; Cornide_2002_104; Cornide_2002_105; Cornide_2002_106; Cornide_2002_108; Cornide_2002_110; Cornide_2002_111; Cornide_2002_114; Cornide_2002_115; Cornide_2002_116; Cornide_2002_117; Cornide_2002_118; Cornide_2002_119; Cornide_2002_120; Cornide_2002_21; Cornide_2002_22; Cornide_2002_23; Cornide_2002_24; Cornide_2002_34; Cornide_2002_50; Cornide_2002_58; Cornide_2002_62; Cornide_2002_63; Cornide_2002_72; Cornide_2002_73; Cornide_2002_75; Cornide_2002_78; Cornide_2002_98; Cornide_2003_10; Cornide_2003_100; Cornide_2003_101; Cornide_2003_104; Cornide_2003_105; Cornide_2003_106; Cornide_2003_107; Cornide_2003_108; Cornide_2003_109; Cornide_2003_11; Cornide_2003_111; Cornide_2003_114; Cornide_2003_115; Cornide_2003_12; Cornide_2003_13; Cornide_2003_15; Cornide_2003_18; Cornide_2003_23; Cornide_2003_24; Cornide_2003_26; Cornide_2003_27; Cornide_2003_28; Cornide_2003_4; Cornide_2003_44; Cornide_2003_45; Cornide_2003_46; Cornide_2003_47; Cornide_2003_48; Cornide_2003_49; Cornide_2003_50; Cornide_2003_51; Cornide_2003_52; Cornide_2003_53; Cornide_2003_54; Cornide_2003_55; Cornide_2003_56; Cornide_2003_57; Cornide_2003_58; Cornide_2003_6; Cornide_2003_68; Cornide_2003_69; Cornide_2003_70; Cornide_2003_71; Cornide_2003_72; Cornide_2003_73; Cornide_2003_74; Cornide_2003_75; Cornide_2003_76; Cornide_2003_77; Cornide_2003_78; Cornide_2003_79; Cornide_2003_8; Cornide_2003_80; Cornide_2003_81; Cornide_2003_82; Cornide_2003_83; Cornide_2003_84; Cornide_2003_86; Cornide_2003_87; Cornide_2003_89; Cornide_2003_90; Cornide_2003_91; Cornide_2003_92; Cornide_2003_93; Cornide_2003_94; Cornide_2003_95; Cornide_2003_96; Cornide_2003_97; Cornide_2004_100; Cornide_2004_107; Cornide_2004_108; Cornide_2004_122; Cornide_2004_15; Cornide_2004_23; Cornide_2004_27; Cornide_2004_28; Cornide_2004_29; Cornide_2004_30; Cornide_2004_32; Cornide_2004_33; Cornide_2004_34; Cornide_2004_37; Cornide_2004_38; Cornide_2004_39; Cornide_2004_40; Cornide_2004_43; Cornide_2004_44; Cornide_2004_47; Cornide_2004_48; Cornide_2004_49; Cornide_2004_51; Cornide_2004_52; Cornide_2004_53; Cornide_2004_54; Cornide_2004_55; Cornide_2004_56; Cornide_2004_57; Cornide_2004_58; Cornide_2004_60; Cornide_2004_61; Cornide_2004_67; Cornide_2004_68; Cornide_2004_70; Cornide_2004_75; Cornide_2004_76; Cornide_2004_84; Cornide_2004_85; Cornide_2004_86; Cornide_2004_89; Cornide_2004_90; Cornide_2005_36; Cornide_2005_54; Cornide_2005_67; Cornide_2005_68; Cornide_2005_74; Cornide_2005_89; Dry mass; Event label; Height; Length; Nitrogen, organic, particulate; Sector; SFB754; Speed; Volume; Wet mass
    Type: Dataset
    Format: text/tab-separated-values, 4446 data points
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  • 5
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    Jelly biomass sinking speed reveals a fast carbon export mechanism (2013)
    PANGAEA
    In:  Supplement to: Lebrato, Mario; Mendes, Pedro André; Steinberg, Deborah K; Birsa, Laura M; Benavides, Mar; Oschlies, Andreas (2013): Jelly biomass sinking speed reveals a fast carbon export mechanism. Limnology and Oceanography, 58(3), 1113-1122, https://doi.org/10.4319/lo.2013.58.3.1113
    Details
    Publication Date: 2024-02-17
    Description: Sinking of gelatinous zooplankton biomass is an important component of the biological pump removing carbon from the upper ocean. The export efficiency, e.g., how much biomass reaches the ocean interior sequestering carbon, is poorly known because of the absence of reliable sinking speed data. We measured sinking rates of gelatinous particulate organic matter (jelly-POM) from different species of scyphozoans, ctenophores, thaliaceans, and pteropods, both in the field and in the laboratory in vertical columns filled with seawater using high-quality video. Using these data, we determined taxon-specific jelly-POM export efficiencies using equations that integrate biomass decay rate, seawater temperature, and sinking speed. Two depth scenarios in several environments were considered, with jelly-POM sinking from 200 and 600 m in temperate, tropical, and polar regions. Jelly-POM sank on average between 850 and 1500 m/d (salps: 800-1200 m/d; ctenophores: 1200-1500 m/d; scyphozoans: 1000-1100 m d; pyrosomes: 1300 m/d). High latitudes represent a fast-sinking and low-remineralization corridor, regardless of species. In tropical and temperate regions, significant decomposition takes place above 1500 m unless jelly-POM sinks below the permanent thermocline. Sinking jelly-POM sequesters carbon to the deep ocean faster than anticipated, and should be incorporated into biogeochemical and modeling studies to provide more realistic quantification of export via the biological carbon pump worldwide.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 6
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    Temperature modulates coccolithophorid sensitivity of growth, photosynthesis and calcification to increasing seawater pCO2 (2014)
    PANGAEA
    In:  Supplement to: Sett, Scarlett; Bach, Lennart Thomas; Schulz, Kai Georg; Koch-Klavsen, Signe; Lebrato, Mario; Riebesell, Ulf (2014): Temperature Modulates Coccolithophorid Sensitivity of Growth, Photosynthesis and Calcification to Increasing Seawater pCO2. PLoS ONE, 9(2), e88308, https://doi.org/10.1371/journal.pone.0088308
    Details
    Publication Date: 2024-03-15
    Description: Increasing atmospheric CO2 concentrations are expected to impact pelagic ecosystem functioning in the near future by driving ocean warming and acidification. While numerous studies have investigated impacts of rising temperature and seawater acidification on planktonic organisms separately, little is presently known on their combined effects. To test for possible synergistic effects we exposed two coccolithophore species, Emiliania huxleyi and Gephyrocapsa oceanica, to a CO2 gradient ranging from ~0.5-250 µmol/kg (i.e. ~20-6000 µatm pCO2) at three different temperatures (i.e. 10, 15, 20°C for E. huxleyi and 15, 20, 25°C for G. oceanica). Both species showed CO2-dependent optimum-curve responses for growth, photosynthesis and calcification rates at all temperatures. Increased temperature generally enhanced growth and production rates and modified sensitivities of metabolic processes to increasing CO2. CO2 optimum concentrations for growth, calcification, and organic carbon fixation rates were only marginally influenced from low to intermediate temperatures. However, there was a clear optimum shift towards higher CO2 concentrations from intermediate to high temperatures in both species. Our results demonstrate that the CO2 concentration where optimum growth, calcification and carbon fixation rates occur is modulated by temperature. Thus, the response of a coccolithophore strain to ocean acidification at a given temperature can be negative, neutral or positive depending on that strain's temperature optimum. This emphasizes that the cellular responses of coccolithophores to ocean acidification can only be judged accurately when interpreted in the proper eco-physiological context of a given strain or species. Addressing the synergistic effects of changing carbonate chemistry and temperature is an essential step when assessing the success of coccolithophores in the future ocean.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcite saturation state; Calculated; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Emiliania huxleyi; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gephyrocapsa oceanica; Growth/Morphology; Growth rate; Haptophyta; Laboratory experiment; Laboratory strains; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Particulate inorganic carbon production per cell; Particulate organic carbon production per cell; Pelagos; pH; Phytoplankton; Potentiometric titration; Primary production/Photosynthesis; Salinity; Single species; Species; Temperature; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1958 data points
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  • 7
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    The effect of nitrate and phosphate availability on Emiliania huxleyi(NZEH) physiology under different CO2 scenarios (2013)
    PANGAEA
    In:  Supplement to: Rouco, Mónica; Branson, O; Lebrato, Mario; Iglesias-Rodriguez, Debora (2013): The effect of nitrate and phosphate availability on Emiliania huxleyi (NZEH) physiology under different CO2 scenarios. Frontiers in Microbiology, 4, https://doi.org/10.3389/fmicb.2013.00155
    Details
    Publication Date: 2024-03-15
    Description: Growth and calcification of the marine coccolithophorid Emiliania huxleyi is affected by ocean acidification and macronutrients limitation and its response varies between strains. Here we investigated the physiological performance of a highly calcified E. huxleyi strain, NZEH, in a multiparametric experiment. Cells were exposed to different CO2 levels (ranging from 250 to 1314 µatm) under three nutrient conditions [nutrient replete (R), nitrate limited (-N), and phosphate limited (-P)]. We focused on calcite and organic carbon quotas and on nitrate and phosphate utilization by analyzing the activity of nitrate reductase (NRase) and alkaline phosphatase (APase), respectively. Particulate inorganic (PIC) and organic (POC) carbon quotas increased with increasing CO2 under R conditions but a different pattern was observed under nutrient limitation. The PIC:POC ratio decreased with increasing CO2 in nutrient limited cultures. Coccolith length increased with CO2 under all nutrient conditions but the coccosphere volume varied depending on the nutrient treatment. Maximum APase activity was found at 561 matm of CO2 (pH 7.92) in -P cultures and in R conditions, NRase activity increased linearly with CO2. These results suggest that E. huxleyi's competitive ability for nutrient uptake might be altered in future high-CO2 oceans. The combined dataset will be useful in model parameterizations of the carbon cycle and ocean acidification.
    Keywords: Alkaline phosphatase, para-Nitrophenylphosphate per cell; Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate, standard deviation; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chromista; Coccoliths, volume; Coccoliths, volume, standard deviation; Coccosphere, length; Coccosphere, length, standard deviation; Coulometric titration; Emiliania huxleyi; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Haptophyta; Irradiance; Irradiance, standard deviation; Laboratory experiment; Laboratory strains; Macro-nutrients; Nitrate; Nitrate, standard deviation; Nitrate reductase activity, per total protein; OA-ICC; Ocean Acidification International Coordination Centre; Other metabolic rates; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Particulate inorganic carbon/particulate organic carbon ratio, standard deviation; Particulate inorganic carbon per cell; Particulate inorganic carbon per cell, standard deviation; Particulate organic carbon, per cell; Particulate organic carbon content per cell, standard deviation; Particulate organic nitrogen per cell; Particulate organic nitrogen per cell, standard deviation; Particulate organic phosphorus per cell; Particulate organic phosphorus per cell, standard deviation; Pelagos; pH; pH, standard deviation; Phosphate; Phosphate, standard deviation; Phytoplankton; Potentiometric titration; Salinity; Single species; South Pacific; Species; Table; Temperature, water; Temperature, water, standard deviation; Treatment; Trientalis-type
    Type: Dataset
    Format: text/tab-separated-values, 1422 data points
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  • 8
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    Influence of temperature and CO2 on the strontium and magnesium composition of coccolithophore calcite (2014)
    PANGAEA
    In:  Supplement to: Müller, Marius N; Lebrato, Mario; Riebesell, Ulf; Barcelos e Ramos, Joana; Schulz, Kai Georg; Blanco-Ameijeiras, S; Sett, Scarlett; Eisenhauer, Anton; Stoll, Heather M (2014): Influence of temperature and CO2 on the strontium and magnesium composition of coccolithophore calcite. Biogeosciences, 11(4), 1065-1075, https://doi.org/10.5194/bg-11-1065-2014
    Details
    Publication Date: 2024-03-15
    Description: Marine calcareous sediments provide a fundamental basis for palaeoceanographic studies aiming to reconstruct past oceanic conditions and understand key biogeochemical element cycles. Calcifying unicellular phytoplankton (coccolithophores) are a major contributor to both carbon and calcium cycling by photosynthesis and the production of calcite (coccoliths) in the euphotic zone, and the subsequent long-term deposition and burial into marine sediments. Here we present data from controlled laboratory experiments on four coccolithophore species and elucidate the relation between the divalent cation (Sr, Mg and Ca) partitioning in coccoliths and cellular physiology (growth, calcification and photosynthesis). Coccolithophores were cultured under different seawater temperature and carbonate chemistry conditions. The partition coefficient of strontium (DSr) was positively correlated with both carbon dioxide (pCO2) and temperature but displayed no coherent relation to particulate organic and inorganic carbon production rates. Furthermore, DSr correlated positively with cellular growth rates when driven by temperature but no correlation was present when changes in growth rates were pCO2-induced. Our results demonstrate the complex interaction between environmental forcing and physiological control on the strontium partitioning in coccolithophore calcite and challenge interpretations of the coccolith Sr / Ca ratio from high-pCO2 environments (e.g. Palaeocene-Eocene thermal maximum). The partition coefficient of magnesium (DMg) displayed species-specific differences and elevated values under nutrient limitation. No conclusive correlation between coccolith DMg and temperature was observed but pCO2 induced a rising trend in coccolith DMg. Interestingly, the best correlation was found between coccolith DMg and chlorophyll a production, suggesting that chlorophyll a and calcite associated Mg originate from the same intracellular pool. These and previous findings indicate that Mg is transported into the cell and to the site of calcification via different pathways than Ca and Sr. Consequently, the coccolith Mg / Ca ratio should be decoupled from the seawater Mg / Ca ratio. This study gives an extended insight into the driving factors influencing the coccolith Mg / Ca ratio and should be considered for future palaeoproxy calibrations.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcidiscus quadriperforatus; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, organic, particulate/Nitrogen, particulate ratio; Carbon, organic, particulate/Nitrogen, particulate ratio, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyll a, production, standard deviation; Chlorophyll a production per cell; Chromista; Coccolithus braarudii; Coulometric titration; Emiliania huxleyi; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gephyrocapsa oceanica; Growth rate; Growth rate, standard deviation; Haptophyta; Iron/Calcium ratio; Irradiance; Laboratory experiment; Laboratory strains; Light:Dark cycle; Magnesium/Calcium ratio; Magnesium/Calcium ratio, standard deviation; Magnesium distribution coefficient; Nitrogen, total, particulate production, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon, production, standard deviation; Particulate inorganic carbon/particulate organic carbon ratio; Particulate inorganic carbon/particulate organic carbon ratio, standard deviation; Particulate inorganic carbon production per cell; Particulate organic carbon, production, standard deviation; Particulate organic carbon production per cell; Pelagos; pH; pH, standard deviation; Phosphorus/Calcium ratio; Phytoplankton; Potentiometric titration; Salinity; Single species; Species; Strontium, partition coefficient; Strontium/Calcium ratio; Strontium/Calcium ratio, standard deviation; Temperature, water; Total particulate nitrogen production per cell
    Type: Dataset
    Format: text/tab-separated-values, 2247 data points
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  • 9
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    Environmental and chemical measurements, and coral calcification rates in Bermuda from 2010 to 2012 (2017)
    PANGAEA
    In:  Supplement to: Courtney, Travis A; Lebrato, Mario; Bates, Nicolas R; Collins, Andrew; de Putron, Samantha J; Garley, Rebecca; Johnson, Rod; Molinero, Juan-Carlos; Noyes, Timothy J; Sabine, Christopher L; Andersson, Andreas J (2017): Environmental controls on modern scleractinian coral and reef-scale calcification. Science Advances, 3(11), e1701356, https://doi.org/10.1126/sciadv.1701356
    Details
    Publication Date: 2024-03-15
    Description: Modern reef-building corals sustain a wide range of ecosystem services because of their ability to build calcium carbonate reef systems. The influence of environmental variables on coral calcification rates has been extensively studied, but our understanding of their relative importance is limited by the absence of in situ observations and the ability to decouple the interactions between different properties. We show that temperature is the primary driver of coral colony (Porites astreoides and Diploria labyrinthiformis) and reef-scale calcification rates over a 2-year monitoring period from the Bermuda coral reef. On the basis of multimodel climate simulations (Coupled Model Intercomparison Project Phase 5) and assuming sufficient coral nutrition, our results suggest that P. astreoides and D. labyrinthiformis coral calcification rates in Bermuda could increase throughout the 21st century as a result of gradual warming predicted under a minimum CO2 emissions pathway [representative concentration pathway (RCP) 2.6] with positive 21st-century calcification rates potentially maintained under a reduced CO2 emissions pathway (RCP 4.5). These results highlight the potential benefits of rapid reductions in global anthropogenic CO2 emissions for 21st-century Bermuda coral reefs and the ecosystem services they provide.
    Keywords: Alkalinity, total; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Brightness; Calcification/Dissolution; Calcification rate; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Cnidaria; Coast and continental shelf; Crescent_Reef; Date; Diploria labyrinthiformis; Entire community; Event label; EXP; Experiment; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Hog_Reef; LATITUDE; LONGITUDE; Month; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Porites astreoides; Rocky-shore community; Salinity; Score on PC1; Single species; Temperate; Temperature, water; Type; Years
    Type: Dataset
    Format: text/tab-separated-values, 2280 data points
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  • 10
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    Sinking speed of Salps (S. thompsoni) (2013)
    PANGAEA
    Details
    Publication Date: 2024-02-17
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; Comment; Distance; Number; Sinking velocity; Time in seconds; Volume
    Type: Dataset
    Format: text/tab-separated-values, 97 data points
    Location Call Number Expected Availability
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