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  • ASLO (Association for the Sciences of Limnology and Oceanography)  (3)
  • Federal Agency for Nature Conservation  (3)
  • 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
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  • 2
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    Species profiles invertebrates ("Icelandic cyprine", "Dog whelk" and "(Euroean) Flat oyster") (2012)
    Federal Agency for Nature Conservation
    In:  In: Threatened Biodiversity in the German North and Baltic Seas: Sensitivities towards Human Activities and the Effects of Climate Change. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Federal Agency for Nature Conservation, Bonn-Bad Godesberg, Germany, pp. 211-247. ISBN 978-3-7843-4017-3
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    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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  • 3
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    Habitat / Biotope Profiles (2012)
    Federal Agency for Nature Conservation
    In:  In: Threatened Biodiversity in the German North and Baltic Seas: Sensitivities towards Human Activities and the Effects of Climate Change. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Federal Agency for Nature Conservation, Bonn-Bad Godesberg, Germany, pp. 41-210. ISBN 978-3-7843-4017-3
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    Publication Date: 2012-11-27
    Type: Book chapter , NonPeerReviewed
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  • 4
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    Reading guide to the species and habitat profiles (2012)
    Federal Agency for Nature Conservation
    In:  In: Threatened Biodiversity in the German North and Baltic Seas: Sensitivities towards Human Activities and the Effects of Climate Change. , ed. by Narberhaus, I., Krause, J. and Bernitt, U. Naturschutz und Biologische Vielfalt, 116 . Federal Agency for Nature Conservation, Bonn, Germany, pp. 27-41. ISBN 978-3-7843-4017-3
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    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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  • 5
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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
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  • 6
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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
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    Publication Date: 2024-04-19
    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
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