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  • Aphanizomenon flos-aquae, biomass as carbon; Aphanizophyll; BIOACID; Biological Impacts of Ocean Acidification; Chaetoceros sp., biomass as carbon; DATE/TIME; Day of experiment; KOSMOS_2012_Tvaerminne; MESO; Mesocosm experiment; Mesocosm label; Nitrogen fixation rate; Phase; Skeletonema marinoi; δ15N  (1)
  • BIOACID; Biological Impacts of Ocean Acidification; KOSMOS_2012_Tvaerminne; MESO; Mesocosm experiment; SOPRAN; Surface Ocean Processes in the Anthropocene  (1)
  • Hochschulschrift  (1)
Document type
Keywords
Publisher
Language
Years
  • 1
    Online Resource
    Online Resource
    Pigmentuntersuchungen am Phytoplankton des Arabischen Meeres mittels der HPLC-Methode (1989)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource (76 Seiten = 4 MB) , Illustration, Graphen, Karte
    Edition: 2020
    URL: https://oceanrep.geomar.de/51284/
    Language: German
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  • 2
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    KOSMOS Finland 2012 mesocosm study: Phytoplankton biomass and pigment concentration, Nitrogen cycle parameters (2018)
    PANGAEA
    In:  Supplement to: Paul, Allanah Joy; Achterberg, Eric Pieter; Bach, Lennart Thomas; Boxhammer, Tim; Czerny, Jan; Haunost, Mathias; Schulz, Kai Georg; Stuhr, Annegret; Riebesell, Ulf (2016): No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community. Biogeosciences, 13(13), 3901-3913, https://doi.org/10.5194/bg-13-3901-2016
    Details
    Publication Date: 2024-03-06
    Description: Nitrogen fixation by filamentous cyanobacteria supplies significant amounts of new nitrogen (N) to the Baltic Sea. This balances N loss processes such as denitrification and anammox, and forms an important N source supporting primary and secondary production in N-limited post-spring bloom plankton communities. Laboratory studies suggest that filamentous diazotrophic cyanobacteria growth and N2-fixation rates are sensitive to ocean acidification, with potential implications for new N supply to the Baltic Sea. In this study, our aim was to assess the effect of ocean acidification on diazotroph growth and activity as well as the contribution of diazotrophically fixed N to N supply in a natural plankton assemblage. We enclosed a natural plankton community in a summer season in the Baltic Sea near the entrance to the Gulf of Finland in six large-scale mesocosms (volume ∼ 55m3) and manipulated fCO2 over a range relevant for projected ocean acidification by the end of this century (average treatment fCO2: 365–1231µatm).
    Keywords: Aphanizomenon flos-aquae, biomass as carbon; Aphanizophyll; BIOACID; Biological Impacts of Ocean Acidification; Chaetoceros sp., biomass as carbon; DATE/TIME; Day of experiment; KOSMOS_2012_Tvaerminne; MESO; Mesocosm experiment; Mesocosm label; Nitrogen fixation rate; Phase; Skeletonema marinoi; δ15N
    Type: Dataset
    Format: text/tab-separated-values, 1870 data points
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    DATA PANGAEA
  • 3
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    Negligible effects of ocean acidification on Eurytemora affinis (2016)
    PANGAEA
    In:  Supplement to: Almén, Anna-Karin; Vehmaa, Anu; Brutemark, Andreas; Bach, Lennart Thomas; Lischka, Silke; Stuhr, Annegret; Furuhagen, Sara; Paul, Allanah Joy; Bermúdez Monsalve, Rafael; Riebesell, Ulf; Engström-Öst, Jonna (2016): Negligible effects of ocean acidification on Eurytemora affinis (Copepoda) offspring production. Biogeosciences, 13(4), 1037-1048, https://doi.org/10.5194/bg-13-1037-2016
    Details
    Publication Date: 2024-03-06
    Description: Ocean acidification is caused by increasing amounts of carbon dioxide dissolving in the oceans leading to lower seawater pH. We studied the effects of lowered pH on the calanoid copepod Eurytemora affinis during a mesocosm experiment conducted in a coastal area of the Baltic Sea. We measured copepod reproductive success as a function of pH, chlorophyll a concentration, diatom and dinoflagellate biomass, carbon to nitrogen (C : N) ratio of suspended particulate organic matter, as well as copepod fatty acid composition. The laboratory-based experiment was repeated four times during 4 consecutive weeks, with water and copepods sampled from pelagic mesocosms enriched with different CO2 concentrations. In addition, oxygen radical absorbance capacity (ORAC) of animals from the mesocosms was measured weekly to test whether the copepod's defence against oxidative stress was affected by pH. We found no effect of pH on offspring production. Phytoplankton biomass, as indicated by chlorophyll a concentration and dinoflagellate biomass, had a positive effect. The concentration of polyunsaturated fatty acids in the females was reflected in the eggs and had a positive effect on offspring production whereas monounsaturated fatty acids of the females were reflected in their eggs but had no significant effect. ORAC was not affected by pH. From these experiments we conclude that E. affinis seems robust against direct exposure to ocean acidification on a physiological level, for the variables covered in the study. E. affinis may not have faced acute pH stress in the treatments as the species naturally face large pH fluctuations.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; KOSMOS_2012_Tvaerminne; MESO; Mesocosm experiment; SOPRAN; Surface Ocean Processes in the Anthropocene
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
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