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  • 1
    Publication Date: 2023-07-09
    Description: We conducted a mesocosm experiment with an integrated multiple driver design to assess the impact of future global change scenarios on plankton, a key component of marine food webs. The experimental treatments were based on the RCP 6.0 and 8.5 scenarios developed by the IPCC, which were Extended (ERCP) to integrate the future predicted changing nutrient inputs into coastal waters. The mesocosm experiment was conducted over three weeks in late-summer (August-September) 2018. Seawater containing a natural plankton community was collected from the coastal North Sea. At the onset of the experiment, CO2 saturated seawater was added to the ERCP scenario mesocosms to adjust pCO2 and pH levels for each scenario. To create a realistic environment, we also manipulated the atmospheric pCO2 in the enclosed mesocosm tanks throughout the experiment. Seawater temperature was adjusted daily according to the current North Sea temperature measured at the Helgoland Roads for the Ambient, and 1.5°C and 3.0°C warmer for the ERCP 6.0 and ERCP 8.5 scenarios, respectively. Dissolved nutrient concentrations were determined at the onset of the experiment and adjusted to reach the desired N:P ratios. Samples were taken in an interval of 1-3 days depending on the phytoplankton bloom development, and community composition, except for the large mesozooplankton, was monitored throughout the experiment period.
    Keywords: Acineta sp., biomass as carbon; Alkalinity, total; Asterionellopsis glacialis, biomass as carbon; Bacillaria paxillifer, biomass as carbon; Bacteriastrum hyalinum, biomass as carbon; Bacterioplankton, biomass as carbon; Balanion comatum, biomass as carbon; Bellerochea malleus, biomass as carbon; Carbon, organic, particulate; Cerataulina pelagica, biomass as carbon; Ceratium furca, biomass as carbon; Ceratium fusus, biomass as carbon; Ceratium horridum, biomass as carbon; Ceratium lineatum, biomass as carbon; Ceratium macroceros, biomass as carbon; Ceratium tripos, biomass as carbon; cf. Heterophrys sp., biomass as carbon; Chaetoceros curvisetus, biomass as carbon; Chaetoceros decipiens, biomass as carbon; Chaetoceros densus, biomass as carbon; Chaetoceros didymus, biomass as carbon; Chaetoceros eibenii, biomass as carbon; Chaetoceros socialis, biomass as carbon; Chaetoceros sp., biomass as carbon; Chrysosphaera sp., biomass as carbon; Ciliophora indeterminata, biomass as carbon; Copepoda; Coscinodiscus sp., biomass as carbon; Cylindrotheca closterium, biomass as carbon; Day of experiment; Detonula pumila, biomass as carbon; Diatoms, pennales indeterminata, biomass as carbon; Dinophyceae indeterminata, biomass as carbon; Dinophysis sp., biomass as carbon; Diplopsalis complex, biomass as carbon; Ditylum brightwellii, biomass as carbon; Emiliania huxleyi, biomass as carbon; Eucampia zodiacus, biomass as carbon; Eutintinnus sp., biomass as carbon; Eutreptiella sp., biomass as carbon; Gonyaulax sp., biomass as carbon; Guinardia delicatula, biomass as carbon; Guinardia flaccida, biomass as carbon; Gymnodinium sp., biomass as carbon; Gyrodinium sp., biomass as carbon; Helicostomella subulata, biomass as carbon; Hydrozoa; Katodinium glaucum, biomass as carbon; Laboea strobila, biomass as carbon; Lauderia annulata, biomass as carbon; Leegaardiella sol, biomass as carbon; Leptocylindrus danicus, biomass as carbon; Leptocylindrus minimus, biomass as carbon; Light intensity; Lohmanniella oviformis, biomass as carbon; Melosira moniliformis, biomass as carbon; MESO; Mesocosm experiment; Mesodinium rubrum, biomass as carbon; Mesozooplankton, other groups; Microzooplankton, biomass as carbon; Nitrogen, inorganic, dissolved; Nitrogen, organic, particulate; Noctiluca scintillans; Paralia sulcata, biomass as carbon; Pelagostrobilidium sp., biomass as carbon; Penilia avirostris; pH; Phaeocystis sp., biomass as carbon; Phalacroma rotundatum, biomass as carbon; Phosphorus, inorganic, dissolved; Phosphorus, organic, particulate; Phytoflagellate indeterminata, biomass as carbon; Phytoplankton, biomass as carbon; PlanktoSERV_exp; Pleurosigma/Gyrosigma, biomass as carbon; Proboscia alata, biomass as carbon; Prorocentrum micans, biomass as carbon; Prorocentrum minimum, biomass as carbon; Protoceratium reticulatum, biomass as carbon; Protoperidinium bipes, biomass as carbon; Protoperidinium conicum, biomass as carbon; Protoperidinium ovatum, biomass as carbon; Protoperidinium sp., biomass as carbon; Pseudo-nitzschia delicatissima complex, biomass as carbon; Pseudo-nitzschia seriata complex, biomass as carbon; Pyrophacus horologium, biomass as carbon; Replicate; Rhizosolenia imbricata, biomass as carbon; Rhizosolenia styliformis, biomass as carbon; Salinity; Scrippsiella sp., biomass as carbon; Scuticociliate indeterminata, biomass as carbon; Silica, dissolved; Skeletonema sp., biomass as carbon; Stenosemella sp., biomass as carbon; Strobilidium sp., biomass as carbon; Strombidinopsis sp., biomass as carbon; Strombidium emergens, biomass as carbon; Strombidium sp., biomass as carbon; Temperature, water; Thalassionema nitzschioides, biomass as carbon; Thalassiosira minima, biomass as carbon; Thalassiosira nordenskioeldii, biomass as carbon; Thalassiosira sp., biomass as carbon; Tiarina fusus, biomass as carbon; Tintinnida indeterminata, biomass as carbon; Tintinnopsis sp., biomass as carbon; Tontonia gracillima, biomass as carbon; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 10962 data points
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  • 2
  • 3
    Publication Date: 2023-06-21
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
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    Springer Science and Business Media LLC
    In:  EPIC3Communications Biology, Springer Science and Business Media LLC, 5(1), pp. 179-, ISSN: 2399-3642
    Publication Date: 2023-06-21
    Description: 〈jats:title〉Abstract〈/jats:title〉〈jats:p〉Global change puts coastal marine systems under pressure, affecting community structure and functioning. Here, we conducted a mesocosm experiment with an integrated multiple driver design to assess the impact of future global change scenarios on plankton, a key component of marine food webs. The experimental treatments were based on the RCP 6.0 and 8.5 scenarios developed by the IPCC, which were Extended (ERCP) to integrate the future predicted changing nutrient inputs into coastal waters. We show that simultaneous influence of warming, acidification, and increased N:P ratios alter plankton dynamics, favours smaller phytoplankton species, benefits microzooplankton, and impairs mesozooplankton. We observed that future environmental conditions may lead to the rise of 〈jats:italic〉Emiliania huxleyi〈/jats:italic〉 and demise of 〈jats:italic〉Noctiluca scintillans〈/jats:italic〉, key species for coastal planktonic food webs. In this study, we identified a tipping point between ERCP 6.0 and ERCP 8.5 scenarios, beyond which alterations of food web structure and dynamics are substantial.〈/jats:p〉
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 5
    Publication Date: 2023-06-21
    Description: Phytoplanktonic organisms are particularly sensitive to environmental change, and, as they represent a direct link between abiotic and biotic compartments within the marine food web, changes in the functional structure of phytoplankton communities can result in profound impacts on ecosystem functioning. Using a trait-based approach, we examined changes in the functional structure of the southern North Sea phytoplankton over the past five decades in relation to environmental conditions. We identified a shift in functional structure between 1998 and 2004 which coincides with a pronounced increase in diatom and decrease in dinoflagellate abundances, and we provide a mechanistic explanation for this taxonomic change. Early in the 2000s, the phytoplankton functional structure shifted from slow growing, autumn blooming, mixotrophic organisms, towards earlier blooming and faster-growing microalgae. Warming and decreasing dissolved phosphorus concentrations were linked to this rapid reorganization of the functional structure. We identified a potential link between this shift and dissolved nutrient concentrations, and we hypothesise that organisms blooming early and displaying high growth rates efficiently take up nutrients which then are no longer available to late bloomers. Moreover, we identified that the above-mentioned functional change may have bottom-up consequences, through a food quality-driven negative influence on copepod abundances. Overall, our study highlights that, by altering the phytoplankton functional composition, global and regional changes may have profound long-term impacts on coastal ecosystems, impacting both food-web structure and biogeochemical cycles.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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