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  • PANGAEA  (82)
  • Bundesamt für Naturschutz  (3)
  • Wiley  (3)
  • American Society of Limnology and Oceanography  (1)
Document type
Keywords
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Years
  • 1
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    Macroalgae may mitigate ocean acidification effects on mussel calcification by increasing pH and its fluctuations (2018)
    ASLO (Association for the Sciences of Limnology and Oceanography) | Wiley
    In:  Limnology and Oceanography, 63 (1). pp. 3-21.
    Details
    Publication Date: 2021-02-08
    Description: Ocean acidification (OA) is generally assumed to negatively impact calcification rates of marine organisms. At a local scale however, biological activity of macrophytes may generate pH fluctuations with rates of change that are orders of magnitude larger than the long-term trend predicted for the open ocean. These fluctuations may in turn impact benthic calcifiers in the vicinity. Combining laboratory, mesocosm and field studies, such interactions between OA, the brown alga Fucus vesiculosus, the sea grass Zostera marina and the blue mussel Mytilus edulis were investigated at spatial scales from decimetres to 100s of meters in the western Baltic. Macrophytes increased the overall mean pH of the habitat by up to 0.3 units relative to macrophyte-free, but otherwise similar, habitats and imposed diurnal pH fluctuations with amplitudes ranging from 0.3 to more than 1 pH unit. These amplitudes and their impact on mussel calcification tended to increase with increasing macrophyte biomass to bulk water ratio. At the laboratory and mesocosm scales, biogenic pH fluctuations allowed mussels to maintain calcification even under acidified conditions by shifting most of their calcification activity into the daytime when biogenic fluctuations caused by macrophyte activity offered temporal refuge from OA stress. In natural habitats with a low biomass to water body ratio, the impact of biogenic pH fluctuations on mean calcification rates of M. edulis was less pronounced. Thus, in dense algae or seagrass habitats, macrophytes may mitigate OA impact on mussel calcification by raising mean pH and providing temporal refuge from acidification stress.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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    DOI: 10.1002/lno.10608
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Steckbriefe der Lebensraumtypen / Biotope ("Ästuarien", "Küstenlagunen", "Flache große Meeresarme und -buchten (Flachwasserzonen)", "Vegetationsfreies Schlick-, Sand- und Mischwatt", "Sandbänke mit nur schwacher ständiger Überspülung", "Riffe", "Seegraswiesen", "Makrophytenbestände", "Miesmuschelbänke", "Seefedern und Grabende Megafauna", "Sabellaria-Riffe", "Schillgründe", "Kiesgründe mit Ophelia-Arten" und "Küstenfernes Tiefenwasser unterhalb der Halokline") (2012)
    Bundesamt für Naturschutz
    In:  In: Bedrohte Biodiversität in der deutschen Nord- und Ostsee - Empfindlichkeiten gegenüber anthropogenen Nutzungen und den Effekten des Klimawandels. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Bundesamt für Naturschutz, Bonn-Bad Godesberg, Germany, pp. 43-221. ISBN 978-3-7843-4016-6
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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    OceanRep: Book chapter
  • 3
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    Grundlagen und Erläuterungen für den Gebrauch der Steckbriefe (2012)
    Bundesamt für Naturschutz
    In:  In: Bedrohte Biodiversität in der deutschen Nord- und Ostsee: Empfindlichkeiten gegenüber anthropogenen Nutzungen und den Effekten des Klimawandels. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Bundesamt für Naturschutz, Bonn, Germany, pp. 27-41. ISBN 978-3-7843-4016-6
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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    OceanRep: Book chapter
  • 4
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    Artensteckbriefe Wirbellose ("Nordische Pupurschnecke", "Europäische Auster" und "Islandmuschel") (2012)
    Bundesamt für Naturschutz
    In:  In: Bedrohte Biodiversität in der deutschen Nord- und Ostsee - Empfindlichkeiten gegenüber anthropogenen Nutzungen und den Effekten des Klimawandels. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Bundesamt für Naturschutz, Bonn-Bad Godesberg, Germany, pp. 223-263. ISBN 978-3-7843-4016-6
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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    OceanRep: Book chapter
  • 5
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    Long-term culture system for deep-sea mussels Gigantidas childressi (2024)
    ASLO (Association for the Sciences of Limnology and Oceanography) | Wiley
    Details
    Publication Date: 2024-06-24
    Description: The simulation of deep-sea conditions in laboratories is technically challenging but necessary for experiments that aim at a deeper understanding of physiological mechanisms or host-symbiont interactions of deep-sea organisms. In a proof-of-concept study, we designed a recirculating system for long-term culture (〉2 yr) of deep-sea mussels Gigantidas childressi (previously Bathymodiolus childressi). Mussels were automatically (and safely) supplied with a maximum stable level of ~60 μmol L−1 methane in seawater using a novel methane–air mixing system. Experimental animals also received daily doses of live microalgae. Condition indices of cultured G. childressi remained high over the years, and low shell growth rates could be detected, too, which is indicative of positive energy budgets. Using stable isotope data, we demonstrate that G. childressi in our culture system gained energy, both, from the digestion of methane-oxidizing endosymbionts and from digesting particulate food (microalgae). Limitations of the system, as well as opportunities for future experimental approaches involving deep-sea mussels, are discussed.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Season affects strength and direction of the interactive impacts of ocean warming and biotic stress in a coastal seaweed ecosystem (2020)
    ASLO (Association for the Sciences of Limnology and Oceanography) | Wiley
    Details
    Publication Date: 2023-02-08
    Description: The plea for using more “realistic,” community‐level, investigations to assess the ecological impacts of global change has recently intensified. Such experiments are typically more complex, longer, more expensive, and harder to interpret than simple organism‐level benchtop experiments. Are they worth the extra effort? Using outdoor mesocosms, we investigated the effects of ocean warming (OW) and acidification (OA), their combination (OAW), and their natural fluctuations on coastal communities of the western Baltic Sea during all four seasons. These communities are dominated by the perennial and canopy‐forming macrophyte Fucus vesiculosus—an important ecosystem engineer Baltic‐wide. We, additionally, assessed the direct response of organisms to temperature and pH in benchtop experiments, and examined how well organism‐level responses can predict community‐level responses to the dominant driver, OW. OW affected the mesocosm communities substantially stronger than acidification. OW provoked structural and functional shifts in the community that differed in strength and direction among seasons. The organism‐level response to OW matched well the community‐level response of a given species only under warm and cold thermal stress, that is, in summer and winter. In other seasons, shifts in biotic interactions masked the direct OW effects. The combination of direct OW effects and OW‐driven shifts of biotic interactions is likely to jeopardize the future of the habitat‐forming macroalga F. vesiculosus in the Baltic Sea. Furthermore, we conclude that seasonal mesocosm experiments are essential for our understanding of global change impact because they take into account the important fluctuations of abiotic and biotic pressures.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    A new mesocosm system to study the effects of environmental variability on marine species and communities (2019)
    American Society of Limnology and Oceanography
    In:  Limnology and Oceanography: Methods, 17 (2). pp. 145-162.
    Details
    Publication Date: 2022-01-31
    Description: Climate change will shift mean environmental conditions and also increase the frequency and intensity of extreme events, exerting additional stress on ecosystems. While field observations on extremes are emerging, experimental evidence of their biological consequences is rare. Here, we introduce a mesocosm system that was developed to study the effects of environmental variability of multiple drivers (temperature, salinity, pH, light) on single species and communities at various temporal scales (diurnal - seasonal): the Kiel Indoor Benthocosms (KIBs). Both, real-time offsets from field measurements or various dynamic regimes of environmental scenarios, can be implemented, including sinusoidal curve functions at any chosen amplitude or frequency, stochastic regimes matching in situ dynamics of previous years and modeled extreme events. With temperature as the driver in focus, we highlight the strengths and discuss limitations of the system. In addition, we examined the effects of different sinusoidal temperature fluctuation frequencies on mytilid mussel performance. High-frequency fluctuations around a warming mean (+2°C warming, ± 2°C fluctuations, wavelength = 1.5 d) increased mussel growth as did a constant warming of 2°C. Fluctuations at a lower frequency (+2 and ± 2°C, wavelength = 4.5 d), however, reduced the mussels’ growth. This shows that environmental fluctuations, and importantly their associated characteristics (such as frequency), can mediate the strength of global change impacts on a key marine species. The here presented mesocosm system can help to overcome a major short-coming of marine experimental ecology and will provide more robust data for the prediction of shifts in ecosystem structure and services in a changing and fluctuating world.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/lom3.10306
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Supplement to: Kiel fjord carbonate chemistry data between 2015 (February) and 2016 (January) (2017)
    PANGAEA
    In:  EPIC3Bremerhaven, PANGAEA
    Details
    Publication Date: 2017-07-03
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: image/png
    Format: application/pdf
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    PAPER (OA)
  • 9
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    Kiel fjord carbonate chemistry data from discrete water samples in 2015 (2017)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: This dataset is part of a dataset collection. Please read the documentation in Kiel fjord carbonate chemistry data between 2015 (February) and 2016 (January) doi:10.1594/PANGAEA.876551 for details on sampling, measurement and data processing.
    Keywords: Alkalinity, total; Carbon, inorganic, dissolved; Carbon dioxide, partial pressure; CO2S; CO2 Sensor; DATE/TIME; DEPTH, water; interpolated; Kiel Fjord; Kiel-Fjord_GEOMAR; pH; Phosphate; Salinity; Silicate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 232 data points
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    DATA PANGAEA
  • 10
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    Continuous water temperature, salinity, oxygen and pH data in front of GEOMAR Pier, Kiel, Germany (2014-2019) (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-17
    Description: 2014-2019: Since September 2014, temperature, salinity, pH (only 2014-2015) and oxygen data were additionally logged in 10-minutes intervals at the GEOMAR pier (54°19'48.8N 10°08'59.6E) (AANDERAA oxygen sensor 3835 & SEABIRD SBE 37-SI MicroCAT CT(D)). The sensor system is mounted to a floating platform so that a continuous depth of 1 m is guaranteed at every time point. Oxygen data were corrected for salinity, temperature and depth following the manual for Aanderaa Optodes using the salinity and temperature measurements from the SEABIRD SBE 37-SI MicroCAT CT(D) sensor. pH was also corrected for salinity, temperature and depth following Martz et al. (2010). After cleaning and other re-boots of the sensor package, temperature, salinity and oxygen data tend to deviate from true values. Hence, 60 minutes of data after any re-boot (after sensor servicing with re-deployment, data download or power failure) were deleted. Furthermore, salinity data lower than 8 and pH data lower than 5 and larger than 10 were removed from the data set as these values were identified as outliers. On May 22nd 2018 as well as on May 26th (22:00) til 27th (15:00) 2019 oxygen data were identified as outliers and removed from the data set. The logged oxygen data were plotted against titration data (doi:10.1594/PANGAEA.930974) to check for drifts in the optode's data. But no drift pattern could be detected and the fit of the regression was very good R2adj. = 0.673, p 〈 0.001)
    Keywords: Corrected; CTD, Sea-Bird, SBE 37-SI MicroCAT; DATE/TIME; DEPTH, water; Kiel-Fjord_GEOMAR-Pier; Monitoring station; MONS; Number; Oxygen; Oxygen, dissolved; Oxygen optode, Aanderaa type 3835; Oxygen saturation; pH; Salinity; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1621988 data points
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    DATA PANGAEA
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