KOSMOS 2018 Gran Canaria mesocosm study on artificial upwelling: mesozooplankton trophic position and diatom fatty acid markers ...

• Main Authors: Goldenberg, Silvan Urs, Spisla, Carsten, Haussmann, Jaqueline
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: artificial upwelling; carbon dioxide removal; fatty acids; Field experiment; GC2018; KOSMOS; mesocosm experiment; negative emission technology; ocean fertilization; plankton food web; Stable isotope; Trophic marker; Type of study; Event label; Treatment; Mesocosm label; Depth, water, experiment, top/minimum; Depth, water, experiment, bottom/maximum; Number of samples; Copepoda; Copepoda, biomass as nitrogen; Copepoda, δ15N; δ15N; Ratio; all-cis-5,8,11,14,17-Eicosapentaenoic acid; all-cis-4,7,10,13,16,19-Docosahexaenoic acid; Treatment: nitrogen; Mesocosm experiment; Calculated; KOSMOS_2018; DAM CDRmare - Test-ArtUp: Road testing ocean artificial upwelling Test-ArtUp; Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean AQUACOSM; Ocean Artificial Upwelling Ocean-artUp; Research Mission of the German Marine Research Alliance DAM: Marine carbon sinks in decarbonisation pathways CDRmare; Arctic; Copepods
• Online Access: https://dx.doi.org/10.1594/pangaea.963589; https://doi.pangaea.de/10.1594/PANGAEA.963589

Mesozooplankton trophic markers to estimate food web length (δ15N) and dietary contribution of diatoms (fatty acids) during the mesocosm experiment in the Canary Islands in autumn 2018. Depth-integrated (0-14 m) plankton nets were taken and omnivorous copepods >200µm used for trophic marker analysis. For trophic level, copepods were picked in groups into tin capsules and δ15N measured in a mass spectrometer. Particulate organic matter (>0.7µm) δ15N was also measured to calculate an autotroph baseline. The difference between copepod and autotroph δ15N was used as trophic level proxy. Trophic level data represents averages across all samples from day 11 to 38. For fatty acids (FA), copepods were picked in groups and FA composition determined by gas chromatography. Particulate organic matter (>0.7µm) FA were also measured as baseline. The marker 20:5ω3/22:6ω3 was most suitable to track the propagation of diatom productivity up the food web. FA data represents averages across samples taken on day 30 and ...