KOSMOS mesocosm experiment Gran Canaria 2019 on testing the effect of nutrient composition (Si:N) during artificial upwelling: mesozooplankton trophic level and fish biomass and feeding ...

• Main Authors: Goldenberg, Silvan Urs, Spisla, Carsten
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: artificial upwelling; carbon dioxide removal; diatoms; Field experiment; food production; GC2019; KOSMOS; mesocosm experiment; negative emission technology; ocean fertilization; plankton food web; small pelagic fish; trophic transfer; Type of study; Event label; Treatment; Mesocosm label; DATE/TIME; Day of experiment; Depth, water, experiment, top/minimum; Depth, water, experiment, bottom/maximum; Sample type; Number of samples; Copepoda; Copepoda, biomass as nitrogen; Copepoda, δ15N; δ15N; δ15N, particulate organic matter; Number of copepoda, per fish stomach; Copepoda, biomass as carbon, per fish stomach; Atherina presbyter, juvenile, wet mass; Atherina presbyter, juvenile, standard length; Atherina presbyter, juvenile; Atherina presbyter, larvae, wet mass; Atherina presbyter, larvae, standard length; Atherina presbyter, larvae; Mesocosm experiment; Calculated; KOSMOS_2019; 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.963467; https://doi.pangaea.de/10.1594/PANGAEA.963467

Mesozooplankton trophic position (via copepod δ15N) to approximate food web length as well as fish production (via biomass increase) and feeding rate (via stomach content) during the mesocosm experiment in the Canary Islands in autumn 2019. Copepods >200µm were sampled depth-integrated (0-2.5m) on day 13. At this time, copepods represented the top of the food web as fish were not yet present. Individuals 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. A small pelagic fish (silverside, Atherina presbyter) was introduced to the mesocosms on day 15. On day 18, for a subset of fish, stomachs content was assessed to estimate feeding success. On day 21, all fish were sampled for biomass and abundance. The upwelling treatment started on day 6. Methodological details in Goldenberg et al. ...