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  • 2020-2024  (3)
  • 1985-1989  (2)
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  • 1
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource (76 Seiten = 4 MB) , Illustration, Graphen, Karte
    Edition: 2020
    Language: German
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  • 2
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    In:  (Diploma thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 63 pp
    Publication Date: 2020-12-10
    Type: Thesis , NonPeerReviewed
    Format: text
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  • 3
    Publication Date: 2024-02-07
    Description: Artificial upwelling brings nutrient-rich deep water to the sun-lit surface to boost fisheries or carbon sequestration. Deep water sources under consideration range widely in inorganic silicon (Si) relative to nitrogen (N). Yet, little is known about how such differences in nutrient composition may influence the effectiveness of the fertilization. Si is essential primarily for diatoms that may increase food web and export efficiency via their large size and ballasting mineral shells, respectively. With a month-long mesocosm study in the subtropical North Atlantic, we tested the biological response to artificial upwelling with varying Si:N ratios (0.07-1.33). Community biomass increased 10-fold across all mesocosms, indicating that basic bloom dynamics were upheld despite the wide range in nutrient composition. Key properties of these blooms, however, were influenced by Si. Photosynthetic capacity and nutrient-use efficiency doubled from Si-poor to Si-rich upwelling, leading to C:N ratios as high as 17, well beyond Redfield. Si-rich upwelling also resulted in 6-fold higher diatom abundance and mineralized Si and a corresponding shift from smaller towards larger phytoplankton. The pronounced change in both plankton quantity (biomass) and quality (C:N ratio, size and mineral ballast) for trophic transfer and export underlines the pivotal role of Si in shaping the response of oligotrophic regions to upwelled nutrients. Our findings indicate a benefit of active Si management during artificial upwelling with the potential to optimize fisheries production and CO2 removal.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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  • 4
    Publication Date: 2023-12-27
    Description: Microzooplankton (microZP, protists) and mesozooplankton (mesoZP, metazoans) abundances and biomass as well as presence of domoic acid (DA, phycotoxin) during the mesocosm experiment in the Canary Islands in autumn 2019. Depth-integrated (0-2.5m) water samples were taken over the course of 33 days, in 2-day intervals for microZP and mesoZP and 4-day intervals for DA. MicroZP was assessed by Utermöhl light microscopy and its biomass estimated using biovolume to carbon conversion factors from the literature. MesoZP samples were split into three size fractions (55-200, 200-500 and 〉500 µm), preserved with 70% ethanol and assessed under a stereo microscope. For biomass, mesoZP were measured in an element analyser. MesoZP data is provided for copepods only (dominant group) and all metazoan zooplankton combined (mainly copepods and appendicularians). For DA, particulate matter was filtered (〉0.7µm) and analysed via liquid chromatography and tandem mass spectrometry. The upwelling treatment started on day 6. Methodological details in Goldenberg et al. (doi:10.3389/fmars.2022.1015188) and Goldenberg et al. (under review).
    Keywords: AQUACOSM; artificial upwelling; Canarias Sea; carbon dioxide removal; CDRmare; Ciliates, heterotrophic; Ciliates, heterotrophic, biomass as carbon; Copepoda; Copepoda, biomass as carbon; Copepoda, nauplii; DAM CDRmare - Test-ArtUp: Road testing ocean artificial upwelling; DATE/TIME; Day of experiment; Depth, water, experiment, bottom/maximum; Depth, water, experiment, top/minimum; diatoms; Dinoflagellates; Dinoflagellates, biomass as carbon; Domoic acid; Domoic acid per unit mass particulate organic carbon; Event label; Field experiment; GC2019; KOSMOS; KOSMOS_2019; KOSMOS_2019_Mesocosm-M1; KOSMOS_2019_Mesocosm-M2; KOSMOS_2019_Mesocosm-M3; KOSMOS_2019_Mesocosm-M4; KOSMOS_2019_Mesocosm-M5; KOSMOS_2019_Mesocosm-M6; KOSMOS_2019_Mesocosm-M7; KOSMOS_2019_Mesocosm-M8; KOSMOS Gran Canaria; MESO; mesocosm experiment; Mesocosm experiment; Mesocosm label; Mesozooplankton; Mesozooplankton, biomass as carbon; negative emission technology; Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean; Ocean Artificial Upwelling; Ocean-artUp; ocean fertilization; Phase description; plankton food web; Protista, heterotrophic; Protista, heterotrophic, biomass as carbon; Research Mission of the German Marine Research Alliance (DAM): Marine carbon sinks in decarbonisation pathways; Size fraction 〉 500 µm; Size fraction 〉 55 µm; Size fraction 200-500 µm; Size fraction 55-200 µm; Test-ArtUp; Treatment; trophic transfer; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 4332 data points
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  • 5
    Publication Date: 2024-01-29
    Description: Abundance and biovolume data of the community of larger phytoplankton from the mesocosm experiment conducted in the Canary Islands in autumn 2019. Depth-integrated (0-2.5m) water samples were taken in 2-days intervals over the course of 33 days and autotrophic taxa assessed to the lowest taxonomic level possible using Utermöhl microscopy. Only taxa larger than approx. 〉5 µm could be considered with this method. Biovolume was calculated based on geometrical measurements (dominant taxa) or the literature (rare taxa). Carbon biomass estimates were purposefully not provided, as the standard literature conversion factors from biovolume to carbon biomass did not apply to many of our samples, likely due to low carbon density within cells. Predominantly mixotrophic or heterotrophic taxa are not provided in this dataset. The upwelling treatment started on day 6. Methodological details in Goldenberg et al. (doi:10.3389/fmars.2022.1015188).
    Keywords: Amphora sp.; Amphora sp., biovolume; AQUACOSM; artificial upwelling; Calculated; Canarias Sea; carbon dioxide removal; CDRmare; Cerataulina pelagica; Cerataulina pelagica, biovolume; Chaetoceros cf. aequatorialis; Chaetoceros cf. aequatorialis, biovolume; Chaetoceros cf. compressus; Chaetoceros cf. compressus, biovolume; Chaetoceros cf. curvisetus; Chaetoceros cf. curvisetus, biovolume; Chaetoceros cf. lauderi; Chaetoceros cf. lauderi, biovolume; Chaetoceros cf. lorenzianus; Chaetoceros cf. lorenzianus, biovolume; Chaetoceros cf. tenuissimus; Chaetoceros cf. tenuissimus, biovolume; Chaetoceros decipiens; Chaetoceros decipiens, biovolume; Chaetoceros densus; Chaetoceros densus, biovolume; Chrysochromulina sp.; Chrysochromulina sp., biovolume; Climacodium cf. frauenfeldianum; Climacodium cf. frauenfeldianum, biovolume; Coccolithophoridae, biovolume; Coccolithophoridae, total; Coscinodiscus cf. pavillardii; Coscinodiscus cf. pavillardii, biovolume; Coscinodiscus sp.; Coscinodiscus sp., biovolume; Cylindrotheca closterium; Cylindrotheca closterium, biovolume; Cylindrotheca sp.; Cylindrotheca sp., biovolume; Dactyliosolen cf. blavyanus; Dactyliosolen cf. blavyanus, biovolume; Dactyliosolen cf. fragilissimus; Dactyliosolen cf. fragilissimus, biovolume; DAM CDRmare - Test-ArtUp: Road testing ocean artificial upwelling; DATE/TIME; Day of experiment; diatoms; Diatoms; Diatoms, biovolume; Dictyocha fibula; Dictyocha fibula, biovolume; Diploneis sp.; Diploneis sp., biovolume; Event label; Flagellates; Flagellates, biovolume; Flagellates indeterminata, oval; Flagellates indeterminata, oval, biovolume; GC2019; Guinardia delicatula; Guinardia delicatula, biovolume; Guinardia striata; Guinardia striata, biovolume; Hemiaulus cf. sinensis; Hemiaulus cf. sinensis, biovolume; KOSMOS; KOSMOS_2019; KOSMOS_2019_Mesocosm-M1; KOSMOS_2019_Mesocosm-M2; KOSMOS_2019_Mesocosm-M3; KOSMOS_2019_Mesocosm-M4; KOSMOS_2019_Mesocosm-M5; KOSMOS_2019_Mesocosm-M6; KOSMOS_2019_Mesocosm-M7; KOSMOS_2019_Mesocosm-M8; KOSMOS Gran Canaria; Leptocylindrus danicus; Leptocylindrus danicus, biovolume; Leptocylindrus minimus; Leptocylindrus minimus, biovolume; Licmophora sp.; Licmophora sp., biovolume; MESO; Mesocosm experiment; Mesocosm label; Microscopy; Minutocellus polymorphus; Minutocellus polymorphus, biovolume; negative emission technology; Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean; Nitzschia cf. acicularis; Nitzschia cf. acicularis, biovolume; Number of taxa; Ocean Artificial Upwelling; Ocean-artUp; ocean fertilization; Phaeocystis cf. globosa; Phaeocystis cf. globosa, biovolume; Phaeocystis sp.; Phaeocystis sp., biovolume; Phase description; Phytoplankton, biovolume; Phytoplankton, total; Pielou evenness index; plankton community; Pleurosigma sp.; Pleurosigma sp., biovolume; Proboscia sp.; Proboscia sp., biovolume; Pseudo-nitzschia delicatissima; Pseudo-nitzschia delicatissima, biovolume; Pseudo-nitzschia pungens; Pseudo-nitzschia pungens, biovolume; Pseudo-nitzschia sp.; Pseudo-nitzschia sp., biovolume; Pseudo-nitzschia subcurvata; Pseudo-nitzschia subcurvata, biovolume; Research Mission of the German Marine Research Alliance (DAM): Marine carbon sinks in decarbonisation pathways; Rhizosolenia cf. imbricata; Rhizosolenia cf. imbricata, biovolume; Rhizosolenia cf. setigera; Rhizosolenia cf. setigera, biovolume; Rhizosolenia sp.; Rhizosolenia sp., biovolume; Shannon Diversity Index; Si:N; silicic acid; Skeletonema sp.; Skeletonema sp., biovolume; Striatella cf. unipunctata; Striatella cf. unipunctata, biovolume; Sum; Test-ArtUp; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 14416 data points
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