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  • 1
    Publication Date: 2019-02-01
    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.
    Type: Article , PeerReviewed
    Format: text
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  • 2
    Publication Date: 2019-09-23
    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.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
    Format: text
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  • 3
    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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  • 4
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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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  • 5
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    PANGAEA
    In:  Supplement to: Löder, Martin G J; Kraberg, Alexandra Claudia; Aberle, Nicole; Peters, Silvia; Wiltshire, Karen Helen (2010): Dinoflagellates and ciliates at Helgoland Roads, North Sea. Helgoland Marine Research, 13 pp, https://doi.org/10.1007/s10152-010-0242-z
    Publication Date: 2024-01-25
    Description: A monitoring programme for microzooplankton was started at the long-term sampling station ''Kabeltonne'' at Helgoland Roads (54°11.30' N; 7°54.00' E) in January 2007 in order to provide more detailed knowledge on microzooplankton occurrence, composition and seasonality patterns at this site and to complement the existing plankton data series. Ciliate and dinoflagellate cell concentration and carbon biomass were recorded on a weekly basis. Heterotrophic dinoflagellates were considerably more important in terms of biomass than ciliates, especially during the summer months. However, in early spring, ciliates were the major group of microzooplankton grazers as they responded more quickly to phytoplankton food availability. Mixotrophic dinoflagellates played a secondary role in terms of biomass when compared to heterotrophic species; nevertheless, they made up an intense late summer bloom in 2007. The photosynthetic ciliate Myrionecta rubra bloomed at the end of the sampling period. Due to its high biomass when compared to crustacean plankton especially during the spring bloom, microzooplankton should be regarded as the more important phytoplankton grazer group at Helgoland Roads. Based on these results, analyses of biotic and abiotic factors driving microzooplankton composition and abundance are necessary for a full understanding of this important component of the plankton.
    Keywords: BAH; German Bight, North Sea; HelgolandRoads_dinoflagellates_and_ciliates; Kabeltonne; LTER_Benthos; Macrobenthic long-term series in the German Bight; MON; Monitoring; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland)
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 6
    Publication Date: 2024-01-25
    Keywords: Acineta sp., biomass as carbon; Akashiwo sanguinea, biomass as carbon; Amphidinium cf. sphenoides, biomass as carbon; Amphidinium crassum, biomass as carbon; Askenasia regina, biomass as carbon; Askenasia sp., biomass as carbon; BAH; Balanion comatum, biomass as carbon, fractionated; Ceratium furca, biomass as carbon; Ceratium fusus, biomass as carbon; Ceratium horridum, biomass as carbon; Ceratium lineatum, biomass as carbon; Cyclotrichium sp., biomass as carbon; Cyrtostrombidium sp., biomass as carbon, fractionated; DATE/TIME; DEPTH, water; Didinium gargantua, biomass as carbon; Dinophysis sp., biomass as carbon; Diplopsalis cf. lenticula, biomass as carbon; Euplotes sp., biomass as carbon; Eutintinnus sp., biomass as carbon, fractionated; Favella ehrenbergii, biomass as carbon; German Bight, North Sea; Gonyaulax cf. spinifera, biomass as carbon; Gymnodinium chlorophorum, biomass as carbon; Gymnodinium sp., biomass as carbon, fractionated; Gyrodinium, biomass as carbon, fractionated; Gyrodinium calyptoglyphe, biomass as carbon; Gyrodinium sp., biomass as carbon, fractionated; HelgolandRoads_dinoflagellates_and_ciliates; Heterocapsa cf. niei, biomass as carbon; Heterocapsa cf. rotundata, biomass as carbon; Kabeltonne; Katodinium glaucum, biomass as carbon; Katodinium sp., biomass as carbon, fractionated; Laboea strobila, biomass as carbon; Leegaardiella cf. ovalis, biomass as carbon; Leegaardiella cf. sol, biomass as carbon; Lohmanniella oviformis, biomass as carbon; LTER_Benthos; Macrobenthic long-term series in the German Bight; Mesodinium pulex, biomass as carbon; Mesodinium sp., biomass as carbon, fractionated; Mesoporos sp., biomass as carbon; MON; Monitoring; Myrionecta rubra, biomass as carbon, fractionated; Nematodinium sp., biomass as carbon; Noctiluca scintillans, biomass as carbon; Peridiniella cf. danica, biomass as carbon; Polykrikos kofoidii, biomass as carbon; Prorocentrum balticum, biomass as carbon; Prorocentrum micans, biomass as carbon; Prorocentrum triestinum, biomass as carbon; Protoperidinium bipes, biomass as carbon; Protoperidinium brevipes, biomass as carbon; Protoperidinium cf. claudicans, biomass as carbon; Protoperidinium cf. conicum, biomass as carbon; Protoperidinium cf. divergens, biomass as carbon; Protoperidinium cf. leonis, biomass as carbon; Protoperidinium cf. minutum group, biomass as carbon; Protoperidinium cf. obtusum, biomass as carbon; Protoperidinium cf. pyriforme group, biomass as carbon; Protoperidinium cf. subinerme, biomass as carbon; Protoperidinium denticulatum, biomass as carbon; Protoperidinium depressum, biomass as carbon; Protoperidinium excentricum, biomass as carbon; Protoperidinium ovatum, biomass as carbon; Protoperidinium pellucidum, biomass as carbon; Protoperidinium pentagonum, biomass as carbon; Protoperidinium sp., biomass as carbon, fractionated; Protoperidinium thorianum, biomass as carbon; Pyrophacus horologium, biomass as carbon; Rimostrombidium sp., biomass as carbon; Salpingella sp., biomass as carbon; Scrippsiella, biomass as carbon; Scuticociliates, biomass as carbon, fractionated; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Spathidium sp., biomass as carbon; Spatulodinium pseudonoctiluca, biomass as carbon; Stenosemella sp., biomass as carbon; Strobilidium cf. neptunii, biomass as carbon; Strobilidium cf. sphaericum, biomass as carbon; Strobilidium cf. spiralis, biomass as carbon; Strobilidium sp., biomass as carbon, fractionated; Strombidinopsis sp., biomass as carbon, fractionated; Strombidium, biomass as carbon, fractionated; Strombidium capitatum, biomass as carbon; Strombidium cf. acutum, biomass as carbon; Strombidium cf. conicum, biomass as carbon; Strombidium cf. emergens, biomass as carbon; Strombidium cf. epidemum, biomass as carbon, fractionated; Strombidium cf. lynni, biomass as carbon; Strombidium cf. tressum, biomass as carbon; Strombidium sp., biomass as carbon, fractionated; Tiarina fusus, biomass as carbon; Tintinnidium cf. balechi, biomass as carbon; Tintinnid sp., biomass as carbon, fractionated; Tintinnopsis cf. radix, biomass as carbon; Tintinnopsis sp., biomass as carbon; Tontonia gracillima, biomass as carbon; Torodinium robustum, biomass as carbon, fractionated; Vorticella sp., biomass as carbon; Warnowia sp., biomass as carbon
    Type: Dataset
    Format: text/tab-separated-values, 3172 data points
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  • 7
    Publication Date: 2024-01-25
    Keywords: Acineta sp.; Akashiwo sanguinea; Amphidinium cf. sphenoides; Amphidinium crassum; Askenasia regina; Askenasia sp.; BAH; Balanion comatum, fractionated; Ceratium furca; Ceratium fusus; Ceratium horridum; Ceratium lineatum; Cyclotrichium sp.; Cyrtostrombidium sp., fractionated; DATE/TIME; DEPTH, water; Didinium gargantua; Dinophysis sp.; Diplopsalis cf. lenticula; Euplotes sp.; Eutintinnus sp., fractionated; Favella ehrenbergii; German Bight, North Sea; Gonyaulax cf. spinifera; Gymnodinium chlorophorum; Gymnodinium sp., fractionated; Gyrodinium, fractionated; Gyrodinium calyptoglyphe; Gyrodinium sp., fractionated; HelgolandRoads_dinoflagellates_and_ciliates; Heterocapsa cf. niei; Heterocapsa cf. rotundata; Kabeltonne; Katodinium glaucum; Katodinium sp., fractionated; Laboea strobila; Leegaardiella cf. ovalis; Leegaardiella cf. sol; Lohmanniella oviformis; LTER_Benthos; Macrobenthic long-term series in the German Bight; Mesodinium pulex; Mesodinium sp., fractionated; Mesoporos sp.; MON; Monitoring; Myrionecta rubra, fractionated; Nematodinium sp.; Noctiluca scintillans; Peridiniella cf. danica; Polykrikos kofoidii; Prorocentrum balticum; Prorocentrum micans; Prorocentrum triestinum; Protoperidinium bipes; Protoperidinium brevipes; Protoperidinium cf. claudicans; Protoperidinium cf. conicum; Protoperidinium cf. divergens; Protoperidinium cf. leonis; Protoperidinium cf. minutum group; Protoperidinium cf. obtusum; Protoperidinium cf. pyriforme group; Protoperidinium cf. subinerme; Protoperidinium denticulatum; Protoperidinium depressum; Protoperidinium excentricum; Protoperidinium ovatum; Protoperidinium pellucidum; Protoperidinium pentagonum; Protoperidinium sp., fractionated; Protoperidinium thorianum; Pyrophacus horologium; Quantitative phytoplankton method (Utermöhl, 1958); Rimostrombidium sp.; Salpingella sp.; Scrippsiella; Scuticociliates, fractionated; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Spathidium sp.; Spatulodinium pseudonoctiluca; Stenosemella sp.; Strobilidium cf. neptunii; Strobilidium cf. sphaericum; Strobilidium cf. spiralis; Strobilidium sp., fractionated; Strombidinopsis sp., fractionated; Strombidium, fractionated; Strombidium capitatum; Strombidium cf. acutum; Strombidium cf. conicum; Strombidium cf. emergens; Strombidium cf. epidemum, fractionated; Strombidium cf. lynni; Strombidium cf. tressum; Strombidium sp., fractionated; Tiarina fusus; Tintinnidium cf. balechi; Tintinnid sp., fractionated; Tintinnopsis cf. radix; Tintinnopsis sp.; Tontonia gracillima; Torodinium robustum, fractionated; Vorticella sp.; Warnowia sp.
    Type: Dataset
    Format: text/tab-separated-values, 5978 data points
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  • 8
    Publication Date: 2024-01-25
    Keywords: BAH; Concentration per cell; German Bight, North Sea; HelgolandRoads_site; Kabeltonne; LTER_Benthos; Macrobenthic long-term series in the German Bight; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Species
    Type: Dataset
    Format: text/tab-separated-values, 244 data points
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  • 9
    Publication Date: 2024-01-25
    Keywords: Acineta sp.; Akashiwo sanguinea; Amphidinium cf. sphenoides; Amphidinium crassum; Askenasia regina; Askenasia sp.; BAH; Balanion comatum, fractionated; Ceratium furca; Ceratium fusus; Ceratium horridum; Ceratium lineatum; Cyclotrichium sp.; Cyrtostrombidium sp., fractionated; DATE/TIME; DEPTH, water; Didinium gargantua; Dinophysis sp.; Diplopsalis cf. lenticula; Euplotes sp.; Eutintinnus sp., fractionated; Favella ehrenbergii; German Bight, North Sea; Gonyaulax cf. spinifera; Gymnodinium chlorophorum; Gymnodinium sp., fractionated; Gyrodinium, fractionated; Gyrodinium calyptoglyphe; Gyrodinium sp., fractionated; HelgolandRoads_dinoflagellates_and_ciliates; Heterocapsa cf. niei; Heterocapsa cf. rotundata; Kabeltonne; Katodinium glaucum; Katodinium sp., fractionated; Laboea strobila; Leegaardiella cf. ovalis; Leegaardiella cf. sol; Lohmanniella oviformis; LTER_Benthos; Macrobenthic long-term series in the German Bight; Mesodinium pulex; Mesodinium sp., fractionated; Mesoporos sp.; MON; Monitoring; Myrionecta rubra, fractionated; Nematodinium sp.; Noctiluca scintillans; Peridiniella cf. danica; Polykrikos kofoidii; Prorocentrum balticum; Prorocentrum micans; Prorocentrum triestinum; Protoperidinium bipes; Protoperidinium brevipes; Protoperidinium cf. claudicans; Protoperidinium cf. conicum; Protoperidinium cf. divergens; Protoperidinium cf. leonis; Protoperidinium cf. minutum group; Protoperidinium cf. obtusum; Protoperidinium cf. pyriforme group; Protoperidinium cf. subinerme; Protoperidinium denticulatum; Protoperidinium depressum; Protoperidinium excentricum; Protoperidinium ovatum; Protoperidinium pellucidum; Protoperidinium pentagonum; Protoperidinium sp., fractionated; Protoperidinium thorianum; Pyrophacus horologium; Quantitative phytoplankton method (Utermöhl, 1958); Rimostrombidium sp.; Salpingella sp.; Scrippsiella; Scuticociliates, fractionated; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Spathidium sp.; Spatulodinium pseudonoctiluca; Stenosemella sp.; Strobilidium cf. neptunii; Strobilidium cf. sphaericum; Strobilidium cf. spiralis; Strobilidium sp., fractionated; Strombidinopsis sp., fractionated; Strombidium, fractionated; Strombidium capitatum; Strombidium cf. acutum; Strombidium cf. conicum; Strombidium cf. emergens; Strombidium cf. epidemum, fractionated; Strombidium cf. lynni; Strombidium cf. tressum; Strombidium sp., fractionated; Tiarina fusus; Tintinnidium cf. balechi; Tintinnid sp., fractionated; Tintinnopsis cf. radix; Tintinnopsis sp.; Tontonia gracillima; Torodinium robustum, fractionated; Vorticella sp.; Warnowia sp.
    Type: Dataset
    Format: text/tab-separated-values, 3172 data points
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  • 10
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    Unknown
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2024-01-12
    Keywords: Baltic and North Sea; Calculated; Course; CT; DATE/TIME; HE409; HE409-track; Heincke; LATITUDE; LONGITUDE; Speed; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 4030 data points
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