GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2020-2023  (1)
  • 2015-2019  (4)
Document type
Keywords
Publisher
Years
Year
  • 1
    facet.materialart.
    Unknown
    A 1‐Million‐Year Record of Environmental Change in the Central Mediterranean Sea From Organic Molecular Proxies (2021)
    Wiley-Agu
    Details
    Publication Date: 2021-11-26
    Description: The Mediterranean Sea is particularly sensitive to climate oscillations and represents a key location to study past climatic and oceanographic changes. One valuable source of paleoceanographic information is through molecular biomarkers in deep sea sediments. This approach has been applied in a number of studies in this basin, but only covering the most recent glacial/interglacial cycles. Here we present, for the first time in the Mediterranean Sea, a molecular biomarker record from the Strait of Sicily that covers the last million years until the present, almost continuously. We present data on alkenone derived urn:x-wiley:25724517:media:palo21102:palo21102-math-0001 index sea surface temperatures (SST) and provide insights on the evolution of the phytoplankton community composition and terrestrial inputs through the analysis of the concentrations of alkenones, brassicasterol and long-chain alcohols. The urn:x-wiley:25724517:media:palo21102:palo21102-math-0002-SST record followed a climatic evolution modulated by glacial/interglacial cycles with a marked increase in the 100 kyr-amplitude of the glacial cycles at ∼430 ka, coincident with the Mid-Brunhes transition. In addition, SSTs were consistently higher compared with other records in the western Mediterranean, indicative of the progressive warming that surface waters experience along their transit from the Strait of Gibraltar to the Central Mediterranean. Regarding the concentrations of alkenones and brassicasterol, they displayed distinct alternate peaks, some of them coeval with the deposition of sapropels. This suggests that different environmental and oceanographic conditions characterized each sapropel which, together with changes in terrestrial inputs and the degree of oligotrophy, induced the alternate proliferation of coccolithophores and diatoms.
    Description: Published
    Description: e2021PA004289
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    Copepod vital rates under CO2-induced acidification: a calanoid species and a cyclopoid species under short-term exposures (2015)
    PANGAEA
    In:  Supplement to: Isari, Stamatina; Zervoudaki, Soultana; Saiz, Enric; Pelejero, Carles; Peters, Janna (2015): Copepod vital rates under CO2-induced acidification: a calanoid species and a cyclopoid species under short-term exposures. Journal of Plankton Research, 37(5), 912-922, https://doi.org/10.1093/plankt/fbv057
    Details
    Publication Date: 2024-03-15
    Description: Although copepods have been considered tolerant against the direct influence of the ocean acidification (OA) projected for the end of the century, some recent studies have challenged this view. Here, we have examined the direct impact of short-term exposure to a pCO2/pH level relevant for the year 2100 (pHNBS, control: 8.18, low pH: 7.78), on the physiological performance of two representative marine copepods: the calanoid Acartia grani and the cyclopoid Oithona davisae. Adults of both species, from laboratory cultures, were preconditioned for four consecutive days in algal suspensions (Akashiwo sanguinea) prepared with filtered sea water pre-adjusted to the targeted pH values via CO2 bubbling. We measured the feeding and respiratory activity and reproductive output of those pre-conditioned females. The largely unaffected fatty acid composition of the prey offered between OA treatments and controls supports the absence in the study of indirect OA effects (i.e. changes of food nutritional quality). Our results show no direct effect of acidification on the vital rates examined in either copepod species. Our findings are compared with results from previous short- and long-term manipulative experiments on other copepod species.
    Keywords: Acartia grani; Alkalinity, total; Alkalinity, total, standard deviation; Animalia; Aragonite saturation state; Aragonite saturation state, standard deviation; Arthropoda; Behaviour; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; 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; Clearance rate; Dry air column-averaged mixing ratio of carbon dioxide; Dry air column-averaged mixing ratio of carbon dioxide, standard deviation; Egg production rate per female; Eggs per clutch; Fatty acid composition; Fatty acid content; Fatty acid content, standard deviation; Fatty acids, standard deviation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Group; Ingestion rate per individual; Laboratory experiment; Laboratory strains; Mediterranean Sea; OA-ICC; Ocean Acidification International Coordination Centre; Oithona davisae; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Potentiometric; Potentiometric titration; Registration number of species; Reproduction; Respiration; Respiration rate, oxygen, per individual; Salinity; Single species; Species; Temperature, water; Time in hours; Treatment; Type; Uniform resource locator/link to reference; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 2908 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 3
    facet.materialart.
    Unknown
    Lack of evidence for elevated CO2-induced bottom-up effects on marine copepods: a dinoflagellate-calanoid prey-predator pair (2016)
    PANGAEA
    In:  Supplement to: Isari, Stamatina; Zervoudaki, Soultana; Peters, J; Papantoniou, Georgia; Pelejero, Carles; Saiz, Enric (2015): Lack of evidence for elevated CO2-induced bottom-up effects on marine copepods: a dinoflagellate-calanoid prey-predator pair. ICES Journal of Marine Science, https://doi.org/10.1093/icesjms/fsv078
    Details
    Publication Date: 2024-03-15
    Description: Rising levels of atmospheric CO2 are responsible for a change in the carbonate chemistry of seawater with associated pH drops (acidification) projected to reach 0.4 units from 1950 to 2100. We investigated possible indirect effects of seawater acidification on the feeding, fecundity, and hatching success of the calanoid copepod Acartia grani, mediated by potential CO2-induced changes in the nutritional characteristics of their prey. We used as prey the autotrophic dinoflagellate Heterocapsa sp., cultured at three distinct pH levels (control: 8.17, medium: 7.96, and low: 7.75) by bubbling pure CO2 via a computer automated system. Acartia grani adults collected from a laboratory culture were acclimatized for 3 d at food suspensions of Heterocapsa from each pH treatment (ca. 500 cells/ml; 300 mg C/l). Feeding and egg production rates of the preconditioned females did not differ significantly among the three Heterocapsa diets. Egg hatching success, monitored once per day for the 72 h, did not reveal significant difference among treatments. These results are in agreement with the lack of difference in the cellular stoichiometry (C : N, C : P, and N : P ratios) and fatty acid concentration and composition encountered between the three tested Heterocapsa treatments. Our findings disagree with those of other studies using distinct types of prey, suggesting that this kind of indirect influence of acidification on copepods may be largely associated with interspecific differences among prey items with regard to their sensitivity to elevated CO2 levels.
    Keywords: Acartia grani; Alkalinity, total; Alkalinity, total, standard deviation; Animalia; Aragonite saturation state; Aragonite saturation state, standard deviation; Arthropoda; Behaviour; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Calculated using SWCO2 (Hunter, 2007); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbon/Phosphorus ratio; Carbon/Phosphorus ratio, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon ingestion rate, standard deviation; Carbon ingestion rate per individual; Carbon per cell; Carbon per cell, standard deviation; Cell biovolume; Cell biovolume, standard deviation; Cell density; Cells equivalent spherical diameter; Chromista; Clearance rate; Clearance rate, standard deviation; Dry air column-averaged mixing ratio of carbon dioxide; Dry air column-averaged mixing ratio of carbon dioxide, standard deviation; Egg production rate, standard deviation; Egg production rate per female; Fatty acid content; Fatty acid content, standard deviation; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross growth efficiency; Gross growth efficiency, standard deviation; Group; Growth/Morphology; Heterocapsa sp.; Ingestion rate, standard deviation; Ingestion rate per individual; Laboratory experiment; Laboratory strains; Myzozoa; Nitrogen/Phosphorus ratio; Nitrogen/Phosphorus ratio, standard deviation; Nitrogen ingestion rate, standard deviation; Nitrogen ingestion rate per individual; Nitrogen per cell; Nitrogen per cell, 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); Pelagos; Percentage; Percentage, standard deviation; pH; pH, standard deviation; Phosphorus ingestion rate, standard deviation; Phosphorus ingestion rate per individual; Phosphorus per cell; Phosphorus per cell, standard deviation; Phytoplankton; Potentiometric; Potentiometric titration; Reproduction; Salinity; Single species; Species; Table; Temperature, water; Time in days; Treatment; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 3726 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 4
    facet.materialart.
    Unknown
    Annual response of two Mediterranean azooxanthellate temperate corals to low-pH and high-temperature conditions (2016)
    PANGAEA
    In:  Supplement to: Movilla, Juancho; Calvo, Eva; Coma, Rafel; Serrano, Eduard; Lopez-Sanz, Angel; Pelejero, Carles (2016): Annual response of two Mediterranean azooxanthellate temperate corals to low-pH and high-temperature conditions. Marine Biology, 163(6), https://doi.org/10.1007/s00227-016-2908-9
    Details
    Publication Date: 2024-03-18
    Description: Ocean acidification (OA) and warming related to the anthropogenic increase in atmospheric CO2 have been shown to have detrimental effects on several marine organisms, especially those with calcium carbonate structures such as corals. In this study, we evaluate the response of two Mediterranean shallow-water azooxanthellate corals to the projected pH and seawater temperature (ST) scenarios for the end of this century. The colonial coral Astroides calycularis and the solitary Leptopsammia pruvoti were grown in aquaria over a year under two fixed pH conditions, control (8.05 pHT units) and low (7.72 pHT units), and simulating two annual ST cycles, natural and high (+3 °C). The organic matter (OM), lipid and protein content of the tissue and the skeletal microdensity of A. calycularis were not affected by the stress conditions (low pH, high ST), but the species exhibited a mean 25 % decrease in calcification rate at high-ST conditions at the end of the warm period and a mean 10 % increase in skeletal porosity under the acidified treatment after a full year cycle. Conversely, an absence of effects on calcification and skeletal microdensity of L. pruvoti exposed to low-pH and high-ST treatments contrasted with a significant decrease in the OM, lipid and protein content of the tissue at high-ST conditions and a 13 % mean increase in the skeletal porosity under low-pH conditions following a full year of exposure. This species-specific response suggests that different internal self-regulation strategies for energy reallocation may allow certain shallow-water azooxanthellate corals to cope more successfully than others with global environmental changes.
    Keywords: Alkalinity, total; Alkalinity, total, standard error; Animalia; Aragonite saturation state; Astroides calycularis; Benthic animals; Benthos; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate of calcium carbonate; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cartagena_OA; Cnidaria; Coast and continental shelf; Density; Event label; EXP; Experiment; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; L_Estartit; Laboratory experiment; Leptopsammia pruvoti; Lipids, total; Mediterranean Sea; OA-ICC; Ocean Acidification International Coordination Centre; Organic matter; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard error; Porosity; Potentiometric; Potentiometric titration; Proteins, total; Registration number of species; Salinity; Salinity, standard error; Single species; Species; Temperate; Temperature; Temperature, water; Time in days; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 12233 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 5
    facet.materialart.
    Unknown
    Seawater carbonate chemistry and microbial abundances, bacterial activity and extracellular enzyme activities (2016)
    PANGAEA
    Details
    Publication Date: 2024-03-18
    Description: We investigated the effects of an increase in dissolved CO2 on the microbial communities of the Mediterranean Sea during two mesocosm experiments in two contrasting seasons: winter, at the peak of the annual phytoplankton bloom, and summer, under low nutrient conditions. The experiments included treatments with acidification and nutrient addition, and combinations of the two. We followed the effects of ocean acidification (OA) on the abundance of the main groups of microorganisms (diatoms, dinoflagellates, nanoeukaryotes, picoeukaryotes, cyanobacteria, and heterotrophic bacteria) and on bacterial activity, leucine incorporation, and extracellular enzyme activity. Our results showed a clear stimulation effect of OA on the abundance of small phytoplankton (pico- and nanoeukaryotes), independently of the season and nutrient availability. A large number of the measured variables showed significant positive effects of acidification in summer compared with winter, when the effects were sometimes negative. Effects of OA were more conspicuous when nutrient concentrations were low. Our results therefore suggest that microbial communities in oligotrophic waters are considerably affected by OA, whereas microbes in more productive waters are less affected. The overall enhancing effect of acidification on eukaryotic pico- and nanophytoplankton, in comparison with the non-significant or even negative response to nutrient-rich conditions of larger groups and autotrophic prokaryotes, suggests a shift towards medium-sized producers in a future acidified ocean.
    Keywords: Abundance per volume; Alkalinity, total; alpha-glucosidase activity; Aragonite saturation state; beta-glucosidase activity; Bicarbonate ion; Biomass/Abundance/Elemental composition; Blanes_Bay_Microbial_Observatory; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chitobiase activity; Chlorophyll a; Coast and continental shelf; Community composition and diversity; Containers and aquaria (20-1000 L or 〈 1 m**2); Entire community; EXP; Experiment; Experiment day; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Leucine aminopeptidase activity; Leucine incorporation rate; Macro-nutrients; Mediterranean Sea; OA-ICC; Ocean Acidification International Coordination Centre; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Potentiometric titration; Replicate; Salinity; Spectrophotometric; Temperate; Temperature; Temperature, water; Treatment; Type
    Type: Dataset
    Format: text/tab-separated-values, 3914 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...