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This dataset contains individual-level growth rate measurements of the blue mussel Mytilus edulis and the Pacific oyster Magallana gigas, collected during a controlled mesocosm experiment in Sylt, Germany (coordinates are included in the dataset). Data were collected over a three-month period, from 29 March 2023 to 26 June 2023. Twelve mesocosms were used: six maintained at ambient temperature and six maintained at +3 °C above ambient. A randomized experimental design was used: six mesocosms contained only M. edulis, while the remaining six contained both species. Observations include shell length and daily shell-length growth rates, total wet weight (including shell) and daily growth rates based on weight. Each mussel was labeled and categorized by size class. Measurements were obtained using digital calipers (The Noble Finn, Model 150 mm) and laboratory balances (Type 00AC, Sartorius AG Göttingen, Germany), as well as handheld multiparameter instruments for water temperature. The dataset provides reproducible, traceable individual-level responses of M. edulis and M. gigas under controlled warming, supporting studies on physiological responses of coastal bivalves to temperature changes.
This dataset comprises abiotic parameters measured during a mesocosm experiment using the AWI Sylt Outdoor Mesocosm (AWISOM) facility conducted on the island of Sylt, Germany, in 2023. The experiment spanned approximately three months, beginning on 16 March 2023. A total of 12 mesocosms were deployed, with six mesocosms assigned to each of two temperature treatments: in situ ambient, and ambient +3.0 °C. Water samples were collected from each mesocosm at a depth of 0.1 m on 103 discrete sampling days. The sampling frequency varied by parameter, with some variables measured daily and others once or several times per week. Recorded parameters include water temperature, dissolved oxygen, pH (HBS scale), conductivity, chlorophyll a, total alkalinity, and concentrations of dissolved inorganic nutrients (phosphate, nitrate, nitrite, ammonium, and silicate). Measurements were carried out using multiparameter probes and laboratory methods. The dataset provides a multi-parameter time series from a controlled coastal mesocosm experiment designed to investigate the effects of warming on musselbank communities in the Wadden Sea.
This dataset contains biogeochemical variables measured during the same mesocosm experiment at Sea Surface Facility (SURF) in Wilhelmshaven, Germany (53.5148° N, 8.1461° E) in 2023. Variables include surfactants and nutrient concentrations, chlorophyll a, pigments, particulate and dissolved organic carbon and nitrogen, and several other biogeochemical parameters. These data complement the daily averaged physical parameters (PANGAEA DOI: https://doi.pangaea.de/10.1594/PANGAEA.983975) and together support the assessment of ecosystem and biogeochemical dynamics associated with the experiment, as described in the related publication Bibi et al., 2025.
The file contains data from the Marine Carbon System. It gathered parameters from the inorganic carbon and incorporate the organic alkalinity as a main contributor to the sea surface microlayer (SML) compared to the Underlaying Water (ULW). Data was collected during Mesocosm Study from 18-May to 17-July 2024 in the Sea sURface Facility (SURF), Institute for Chemistry and Biology of the Marine Environment, Wilhelmshaven, Germany. Discrete samples to measure Dissolved Inorganic Carbon (DIC), Total Alkalinity (TA) and Organic Alkalinity (OA) were collected. For SML data, DIC, TA and OA was collected every third day following the glass‑plate technique (Harvey and Burzell, 1972). The ULW data, DIC, TA and OA were collected every day using a suction system to collect the sample from 0.4 m depth. Discrete samples were transported to the laboratory for further analysis; DIC was determined coulometrically (CM5017, UIC, IL, USA), and TA concentration was directly measured by high-precision closed-cell potentiometric titration (916 Ti-Touch, Metrohm, Switzerland). OA concentration was determined directly after TA was measured, using the same sample (from which all carbonate species had been purged), denoted as back titration. The dataset includes quality flags 0-4 with flags 1 and 2 are ready for use. See metadata for more information.
The data presented herein originates from a mesocosm study conducted as part of the BMBF CDRmare, Retake project (grant agreement no. 03F0895A), aimed at investigating the ecological ramifications of ocean alkalinity enhancement (OAE). Twelve mesocosms were deployed in Helgoland South Harbor, Germany, and systematically sampled using integrated water samplers over the period spanning from March 12th to April 20th, 2023. Six alkalinity levels under two dilution scenarios were established to differentiate between localized and uniform OAE additions. Alkalinity was increased stepwise to ΔTAmax = 1250 μmol kg-1 (250 μmol TA kg-1 increments) using sodium hydroxide (NaOH) with calcium chloride (CaCl2) to simulate cation release during calcium-based mineral dissolution, causing strong carbonate chemistry perturbations (e.g., pHT > 9.25). The dataset encompasses a spectrum of sediment trap particle flux data, water column biogeochemistry including pigment variables, inorganic nutrients, carbonate chemistry parameters. The study and data set offer insights into impacts of alkalinity enhancement on marine ecosystems and their associated biogeochemistry.
We conducted a mesocosm study to investigate ecosystem responses to ocean alkalinity enhancement (OAE) in the temperate waters of the German North Sea on Helgoland in spring 2023. We simulated non-CO2-equilibrated OAE via calcium hydroxide through the addition of calcium chloride and sodium hydroxide. Twelve 6 m³ mesocosms were used to simulate two scenarios: in six mesocosms we established a gradient of added alkalinity from 0 to 1250 µmol/kg in increments of 250 µmol/kg, simulating immediate (imm) dilution of alkalised waters. For the second set of six mesocosms, alkalinity was added only to the top 1 m of each mesocosm, doubling the target added alkalinity. The top layer was mixed with the untreated bottom layer after 48 hours, simulating delayed dilution of alkalised waters (del) and ultimately leading to the same alkalinity gradient as the immediate dilution treatment. This data contains water column biogeochemical variables, including dissolved inorganic nutrient concentrations (µmol/L), chlorophyll a concentrations (µg/L) and suspended particulate matter (biogenic silica, particulate organic carbon, nitrogen and phosphate; µmol/L). Nutrients, particulate organic phosphate and biogenic silica were measured spectrophotometrically (Unicam UV 300, Thermo Spectronic, USA). High-performance liquid chromatography (Thermo Scientific HPLC Ultimate 3000) was performed for chlorophyll a determination and particulate organic carbon and nitrogen were measured using an elemental analyser (Flash EA, Thermo Fisher).
This dataset contains plant growth and biomass measurements collected during a controlled mesocosm experiment conducted at the AWI Sylt Outdoor Mesocosm facility, Wadden Sea Station Sylt, Germany, between June and September 2025. The experiment investigated the effects of sediment grain size, microtopography and climate warming on the salt marsh pioneer Salicornia. Plants were grown in PVC tubes filled with sandy, mixed or muddy sediments and exposed to four different climate treatments (ambient, warming, warming-drought, heatwave-drought). Climate treatments were implemented through active control of the water temperature. Experimental microtopographies simulated small-scale elevation differences. Plant height was measured repeatedly to quantify growth dynamics. Above ground biomass was measured at the end of the experiment. The experiment was conducted under controlled mesocosm conditions to quantify the relative importance of sediment properties, topographic variation and warming for pioneer marsh vegetation performance.
This dataset contains continuous water temperature measurements collected during a controlled mesocosm experiment conducted at the AWI Sylt Outdoor Mesocosm facility, Wadden Sea Station Sylt, Germany, between June and September 2025. The experiment investigated the effects of sediment grain size, microtopography and climate warming on the salt marsh pioneer Salicornia. Plants were grown in PVC tubes filled with sandy, mixed or muddy sediments and exposed to four different climate treatments (ambient, warming, warming-drought, heatwave-drought). Climate treatments were implemented through active control of the water temperature. Experimental microtopographies simulated small-scale elevation differences. The experiment was conducted under controlled mesocosm conditions to quantify the relative importance of sediment properties, topographic variation and warming for pioneer marsh vegetation performance.
This dataset contains continuous air temperature and relative humidity measurements collected during a controlled mesocosm experiment conducted at the AWI Sylt Outdoor Mesocosm facility, Wadden Sea Station Sylt, Germany, between June and September 2025. The experiment investigated the effects of sediment grain size, microtopography and climate warming on the salt marsh pioneer Salicornia. Plants were grown in PVC tubes filled with sandy, mixed or muddy sediments and exposed to four different climate treatments (ambient, warming, warming-drought, heatwave-drought). Climate treatments were implemented through active control of the water temperature. Air temperature was not directly manipulated but responded indirectly to the imposed water temperature treatments and ambient atmospheric conditions. Experimental microtopographies simulated small-scale elevation differences. The experiment was conducted under controlled mesocosm conditions to quantify the relative importance of sediment properties, topographic variation and warming for pioneer marsh vegetation performance.
This dataset reports physiological measurements of two bivalve species, Mytilus edulis (blue mussel) and Magallana gigas (Pacific oyster), obtained during a three-month mesocosm experiment conducted in Sylt, Germany, in 2023. Physiological data were collected between 27 April 2023 and 25 June 2023.Twelve mesocosms were used to investigate the effects of temperature on individual-level physiological traits, with treatments including ambient temperature and ambient +3°C. Parameters measured include clearance rate, ingestion rate, and respiration rate. Environmental variables such as water temperature, depth, and sampling time were recorded for each measurement. Individual bivalves were labeled for tracking, and species identification followed WoRMS taxonomy. Measurements were performed using handheld multiparameter instruments and laboratory analyses. The dataset provides high-resolution, individual-based physiological responses of bivalves to moderate warming, supporting research on temperature-dependent feeding, metabolic processes, and energy flux in coastal ecosystems.
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