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  • 1
    Online Resource
    Online Resource
    Kiel : Universitätsbibliothek Kiel
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (143 Seiten) , Illustrationen
    DDC: 570
    Language: English
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  • 2
    Publication Date: 2023-02-24
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; Cell, diameter; Cell biovolume; Cell size; Taxon/taxa
    Type: Dataset
    Format: text/tab-separated-values, 620 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Horn, Henriette G; Boersma, Maarten; Garzke, Jessica; Löder, Martin G J; Sommer, Ulrich; Aberle, Nicole (2016): Effects of high CO2 and warming on a Baltic Sea microzooplankton community. ICES Journal of Marine Science, 73, 772-782, https://doi.org/10.1093/icesjms/fsv198
    Publication Date: 2023-02-24
    Description: Global warming and ocean acidification are among the most important stressors for aquatic ecosystems in the future. To investigate their direct and indirect effects on a near-natural plankton community, a multiple-stressor approach is needed. Hence, we set up mesocosms in a full-factorial design to study the effects of both warming and high CO2 on a Baltic Sea autumn plankton community, concentrating on the impacts on microzooplankton (MZP). MZP abundance, biomass, and species composition were analysed over the course of the experiment. We observed that warming led to a reduced time-lag between the phytoplankton bloom and an MZP biomass maximum. MZP showed a significantly higher growth rate and an earlier biomass peak in the warm treatments while the biomass maximum was not affected. Increased pCO2 did not result in any significant effects on MZP biomass, growth rate, or species composition irrespective of the temperature, nor did we observe any significant interactions between CO2 and temperature. We attribute this to the high tolerance of this estuarine plankton community to fluctuations in pCO2, often resulting in CO2 concentrations higher than the predicted end-of-century concentration for open oceans. In contrast, warming can be expected to directly affect MZP and strengthen its coupling with phytoplankton by enhancing its grazing pressure.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
    Publication Date: 2023-02-24
    Description: Aquatic ecosystems face a multitude of environmental stressors, including warming and acidification. While warming is expected to have a pronounced effect on plankton communities, many components of the plankton seem fairly robust towards realistic end-of-century acidification conditions. However, interactions of the two stressors and the inclusion of further factors such as nutrient concentration and trophic interactions are expected to change this outcome. We investigated the effects of warming and high CO2 on a nutrient-deplete late summer plankton community from the Kiel Fjord, Baltic Sea, using a mesocosm setup crossing two temperatures with a gradient of CO2. Phytoplankton and microzooplankton (MZP) growth rates as well as biomass, taxonomic composition, and grazing rates of MZP were analysed. We observed effects of high CO2, warming, and their interactions on all measured parameters. The occurrence and direction of the effects were dependent on the phytoplankton or MZP community composition. In addition, the abundance of small-sized phytoplankton was identified as one of the most important factors in shaping the MZP community composition. Overall, our results indicate that an estuarine MZP community used to strong natural fluctuations in CO2 can still be affected by a moderate increase in CO2 if it occurs in combination with warming and during a nutrient-deplete post-bloom situation. This highlights the importance of including trophic interactions and seasonality aspects when assessing climate change effects on marine zooplankton communities.
    Keywords: Baltic Sea; BIOACID; Biological Impacts of Ocean Acidification; Cell, diameter; Cell, length; Cell biovolume; ciliates; Dinoflagellates; global warming; mesocosm; Ocean acidification; Taxon/taxa
    Type: Dataset
    Format: text/tab-separated-values, 1414 data points
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  • 5
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    PANGAEA
    In:  Supplement to: Langer, Julia A F; Meunier, Cédric Léo; Ecker, Ursula; Horn, Henriette G; Schwenk, Klaus; Boersma, Maarten (2019): Acclimation and adaptation of the coastal calanoid copepod Acartia tonsa to ocean acidification: a long-term laboratory investigation. Marine Ecology Progress Series, 619, 35-51, https://doi.org/10.3354/meps12950
    Publication Date: 2023-06-09
    Description: The ongoing acidification process of the oceans is likely to have consequences for many marine biota. Although evolutionary responses are expected during persisting environmental change, little is known about the adaptability of copepods. Therefore, we set up a 3 ½ years long selection experiment, culturing Acartia tonsa populations in water treated with 200 and 800 µatm pCO2, feeding them with algae grown in f/2 medium under 200 µatm pCO2 and in f/2 N P medium under 800 µatm pCO2. After three reciprocal transplant experiments we measured copepods' developmental rates, carbon to nutrient ratios, egg production and hatching rates. Under high CO2 conditions, stoichiometric discrepancies between the requirements of A. tonsa and its food resulted in a significantly decreased developmental rate independent from the selective history. After one year, these discrepancies appeared alleviated by an optimised homeostasis regulation of the copepods, indicating a high body stoichiometry regulation plasticity. Egg production and hatching success were unaffected by the experimental conditions, however, results indicated a premature hatching of eggs from females with a high CO2 selective history. Over the experimental period we did not detect any beneficial adaptations of the copepods cultured under high CO2 conditions of elevated seawater pCO2 and associated food quality reduction. Towards the end of the experiment, copepods cultured under elevated pCO2 and fed with high CO2 algae, showed an increased body mass and decreased prosome length. Such physiological changes could have profound long term consequences for marine copepods, food web interactions, and ultimately ecosystem structures and functions.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification
    Type: Dataset
    Format: application/zip, 108.3 kBytes
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  • 6
    Publication Date: 2023-07-10
    Description: Aquatic ecosystems face a multitude of environmental stressors, including warming and acidification. While warming is expected to have a pronounced effect on plankton communities, many components of the plankton seem fairly robust towards realistic end-of-century acidification conditions. However, interactions of the two stressors and the inclusion of further factors such as nutrient concentration and trophic interactions are expected to change this outcome. We investigated the effects of warming and high CO2 on a nutrient-deplete late summer plankton community from the Kiel Fjord, Baltic Sea, using a mesocosm setup crossing two temperatures with a gradient of CO2. Phytoplankton and microzooplankton (MZP) growth rates as well as biomass, taxonomic composition, and grazing rates of MZP were analysed. We observed effects of high CO2, warming, and their interactions on all measured parameters. The occurrence and direction of the effects were dependent on the phytoplankton or MZP community composition. In addition, the abundance of small-sized phytoplankton was identified as one of the most important factors in shaping the MZP community composition. Overall, our results indicate that an estuarine MZP community used to strong natural fluctuations in CO2 can still be affected by a moderate increase in CO2 if it occurs in combination with warming and during a nutrient-deplete post-bloom situation. This highlights the importance of including trophic interactions and seasonality aspects when assessing climate change effects on marine zooplankton communities.
    Keywords: Balanion comatum; Baltic Sea; BIOACID; Biological Impacts of Ocean Acidification; ciliates; Ciliates, loricate; Ciliates, other; DATE/TIME; Day of experiment; Dinoflagellates; Dinoflagellates, athecate; Dinoflagellates, thecate; Dinophysis sp.; Euplotes sp.; global warming; Lohmaniella oviformis; mesocosm; Mesocosm label; Myrionecta rubra; Ocean acidification; Prorocentrum micans; Prorocentrum minimum; Strobilidium sp.; Strobilidium spp.; Strombidium sp.; Strombidium spp.; Suctoria; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 1656 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Horn, Henriette G; Sander, Nils; Stuhr, Annegret; Algueró-Muñiz, Maria; Bach, Lennart Thomas; Löder, Martin G J; Boersma, Maarten; Riebesell, Ulf; Aberle, Nicole (2016): Low CO2 Sensitivity of Microzooplankton Communities in the Gullmar Fjord, Skagerrak: Evidence from a Long-Term Mesocosm Study. PLoS ONE, 11(11), e0165800, https://doi.org/10.1371/journal.pone.0165800
    Publication Date: 2024-03-06
    Description: Ocean acidification is considered as a crucial stressor for marine communities. In this study, we tested the effects of the IPCC RPC6.0 end-of-century acidification scenario on a natural plankton community in the Gullmar Fjord, Sweden, during a long-term mesocosm experiment from a spring bloom to a mid-summer situation. The focus of this study was on microzooplankton and its interactions with phytoplankton and mesozooplankton. The microzooplankton community was dominated by ciliates, especially small Strombidium sp., with the exception of the last days when heterotrophic dinoflagellates increased in abundance. We did not observe any effects of high CO2 on the community composition and diversity of microzooplankton. While ciliate abundance, biomass and growth rate were not affected by elevated CO2, we observed a positive effect of elevated CO2 on dinoflagellate abundances. Additionally, growth rates of dinoflagellates were significantly higher in the high CO2 treatments. Given the higher Chlorophyll a content measured under high CO2, our results point at mainly indirect effects of CO2 on microzooplankton caused by changes in phytoplankton standing stocks, in this case most likely an increase in small-sized phytoplankton of 〈8 µm. Overall, the results from the present study covering the most important part of the growing season indicate that coastal microzooplankton communities are rather robust towards realistic acidification scenarios.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
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    PANGAEA
    In:  Supplement to: Algueró-Muñiz, Maria; Horn, Henriette G; Alvarez-Fernandez, Santiago; Spisla, Carsten; Aberle, Nicole; Bach, Lennart Thomas; Guan, WanChun; Achterberg, Eric Pieter; Riebesell, Ulf; Boersma, Maarten (2019): Analyzing the Impacts of Elevated-CO2 Levels on the Development of a Subtropical Zooplankton Community During Oligotrophic Conditions and Simulated Upwelling. Frontiers in Marine Science, 6, https://doi.org/10.3389/fmars.2019.00061
    Publication Date: 2024-03-06
    Description: Ocean acidification (OA) is affecting marine ecosystems through changes in carbonate chemistry that may influence consumers of phytoplankton, often via trophic pathways. Using a mesocosm approach, we investigated OA effects on a subtropical zooplankton community during oligotrophic, bloom, and post-bloom phases under a range of different pCO2 levels (from ∼400 to ∼1480 μatm).
    Keywords: BIOACID; Biological Impacts of Ocean Acidification
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 9
    Publication Date: 2024-03-06
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; Ciliates; DATE/TIME; Day of experiment; Depth, bottom/max; Depth, top/min; Dinoflagellates; Event label; KOSMOS_2014; KOSMOS_2014_Mesocosm-M1; KOSMOS_2014_Mesocosm-M2; KOSMOS_2014_Mesocosm-M3; KOSMOS_2014_Mesocosm-M4; KOSMOS_2014_Mesocosm-M5; KOSMOS_2014_Mesocosm-M6; KOSMOS_2014_Mesocosm-M7; KOSMOS_2014_Mesocosm-M8; KOSMOS_2014_Mesocosm-M9; MESO; Mesocosm experiment; Mesocosm label; Microzooplankton; Subtropical North Atlantic; Treatment: partial pressure of carbon dioxide
    Type: Dataset
    Format: text/tab-separated-values, 570 data points
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  • 10
    Publication Date: 2024-03-06
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; Cell, diameter; Cell, length; Cell biovolume; Gullmar Fjord, Skagerrak, Sweden; KOSMOS_2013_Fjord; KOSMOS 2013; Kristineberg, Sweden; MESO; Mesocosm experiment; Taxon/taxa
    Type: Dataset
    Format: text/tab-separated-values, 1816 data points
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