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KOSMOS 2023 Helgoland mesocosm study on ocean alkalinity enhancement: phytoplankton and microzooplankton abundance and biomass data

This dataset contains species-resolved phytoplankton and microzooplankton abundance and biomass data from the KOSMOS 2023 Helgoland mesocosm experiment conducted in the coastal waters off Helgoland Island in the North Sea, Germany. The experiment investigated the effects of Ocean Alkalinity Enhancement (OAE) on plankton communities during the development of a natural spring bloom. Six mesocosms (~6 m³) were subjected to an immediate dilution OAE scenario, establishing an alkalinity enhancement gradient ranging from ΔTA 0 to 1250 µmol kg⁻¹ in increments of 250 µmol kg⁻¹ through calcium-based alkalinity addition. The dataset includes taxonomically resolved phytoplankton and microzooplankton abundance (cells mL⁻¹), carbon biomass (µg C L⁻¹), functional group classifications, and World Register of Marine Species (WoRMS) taxonomic identifiers. Associated carbonate chemistry measurements, including total alkalinity (TA), dissolved inorganic carbon (DIC), pH, fugacity of carbon dioxide (fCO₂), salinity, temperature, and calculated ΔTA values are provided for each sampling event.

Ecosystem metrics: nutrients measured in two AWISOM mesocosm experiments in 2017

In this dataset, we measured nutrients (PO4, NOs, NH4, chlorophyll-a) in response to increased temperature and fish thermal plasticity. Measured weekly (between 19.05.2017 - 18.08.2017) from water samples taken within each mesocosm at the AWISOM mesocosm facility of the Wadden Sea Station Sylt. Nutrient levels were analyzed with an AutoAnalyzer3 (SEAL Analytical, Norderstedt, Germany). Chlorophyll-a was measured using a bbe AlgaeLabAnalyser (bbe Moldaenke, Schwentinental, Germany)

Ecosystem metrics: nutrients measured in two AWISOM mesocosm experiments in 2019

In this dataset, we measured nutrients (PO4, NOs, NH4, chlorophyll-a) in response to increased temperature and fish thermal plasticity. Measured weekly (between 06.06.2019 - 26.08.2019) from water samples taken within each mesocosm at the AWISOM mesocosm facility of the Wadden Sea Station Sylt. Nutrient levels were analyzed with an AutoAnalyzer3 (SEAL Analytical, Norderstedt, Germany). Chlorophyll-a was measured using a bbe AlgaeLabAnalyser (bbe Moldaenke, Schwentinental, Germany).

Ecosystem metrics: Epiphyte biomass accumulation measured in two AWISOM mesocosm experiments in 2017

In this dataset, we measured epiphyte biomass accumulation in response to increased temperature and fish thermal plasticity measured as total accumulated weight (ash free dry mass) over the course of the mesocosm experiment conducted in 2017 at the AWISOM mesocosm facility of the Wadden Sea Station Sylt.

Ecosystem metrics: epiphyte biomass measured in two AWISOM mesocosm experiments in 2019

In this dataset, we measured epiphyte biomass accumulation in response to increased temperature and fish thermal plasticity measured as total accumulated weight (ash free dry mass) over the course of the mesocosm experiment conducted in 2019 at the AWISOM mesocosm facility of the Wadden Sea Station Sylt.

Ecosystem metrics: Copepod abundance measured in two AWISOM mesocosm experiments in 2017

In this dataset, we measured copepod abundance in response to increased temperature and fish thermal plasticity estimated as the total number of copepods (count) identified throughout the mesocosm experiment conducted in 2017 at the AWISOM mesocosm facility of the Wadden Sea Station Sylt.

Ecosystem metrics: copepod abundance measured in two AWISOM mesocosm experiments in 2019

In this dataset, we measured copepod abundance in response to increased temperature and fish thermal plasticity estimated as the total number of copepods (count) identified throughout the mesocosm experiment conducted in 2019 at the AWISOM mesocosm facility of the Wadden Sea Station Sylt.

Ecosystem metrics: oyster growth measured in two AWISOM mesocosm experiments in 2019

In this dataset, we measured oyster growth in response to increased temperature and fish thermal plasticity measured as final - initial weight (wet weight) of individuals in a mesocosm experiment conducted in 2019 at the AWISOM mesocosm facility of the Wadden Sea Station Sylt.

Ecosystem metrics: oyster growth measured in two AWISOM mesocosm experiments in 2017

In this dataset, we measured oyster growth in response to increased temperature and fish thermal plasticity measured as final - initial weight (wet weight) of individuals in a mesocosm experiment conducted in 2017 at the AWISOM mesocosm facility of the Wadden Sea Station Sylt.

Ecosystem metrics: mussel growth measured in two AWISOM mesocosm experiments in 2019

In this dataset, we measured mussel growth in response to increased temperature and fish thermal plasticity measured as final - initial weight (wet weight) of individuals in a mesocosm experiment conducted in 2019 at the AWISOM mesocosm facility of the Wadden Sea Station Sylt.

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