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Mytilus edulis and Magallana gigas growth rates from a three-month mesocosm experiment, Sylt, 2023

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.

Physiological responses of Mytilus edulis and Magallana gigas from a three-month mesocosm experiment, Sylt, 2023

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.

High-Resolution Orthomosaics and Digital Elevation Models of Biogenic Structures in the German Wadden Sea

This dataset contains high-resolution (5 cm/pixel) orthomosaics and digital elevation models (DEMs) from unoccupied aerial vehicle (UAV) surveys of biogenic structures in the German Wadden Sea. Two Pacific oyster reefs (Kaiserbalje, Nordland) and one blue mussel bed (Nordstrand) were monitored between 2020 and 2022. The data, processed via structure from motion (SfM) and georeferenced, are provided as raster files (*.tiff), ready for GIS analysis. The Random Forest (RF) classification shapefiles support the mapping of biogenic structures. This dataset facilitates research on biogenic structure growth, sediment dynamics, and geomorphological processes in intertidal environments

Physiological data of Pacific oyster Crassostrea (Magallana) gigas after exposure to intermittent hypoxia and the combination with (fluctuating) elevated temperature

Organisms in intertidal zones experience fluctuations in environmental stressors such as hypoxia and temperature. These stressors and their fluctuations often appear in combination. Combination of stressors can have different effects compared to single stressors. In this study, we investigate the physiological effects of intermittent hypoxia in combination with different temperature regimes on the Pacific Oyster Crassostrea (Magallana) gigas. The oysters were exposed to hypoxic cycles (12h hypoxia by emersion/12h submersion) at normal (15°C), elevated (30°C) or fluctuating (15°C submersion/30°C emersion) temperature for 10 days. After the last submersion phase, the gills and digestive gland were sampled. We measured markers for bioenergetics and redox-balance in the gills and digestive gland using colorimetric methods as well as a set of metabolites (predominantly amino acids, osmolytes, anaerobic end products and energetic metabolites) in the gills using LC-MS/MS. Oysters kept submerged for up to 10 days were used as controls.

Number of consumed Mytilus edulis in a feeding experiment with Hemigrapsus takanoi and Carcinus maenas

Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.

Number of consumed Gammarus locusta in a feeding experiment with Hemigrapsus takanoi and Carcinus maenas

Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.

Counts of amphipods, Fucus and Asian shore crabs at two sampling locations in the northern Wadden Sea

Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.

Number of consumed Mytilus edulis in a feeding experiment with Hemigrapsus takanoi

Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.

Densities of blue mussels recruits in a predation experiment with native and non-native shore crabs

Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.

Density development of Carcinus maenas and Hemigrapsus takanoi between 2017-2020 in the Northfrisian Wadden Sea

Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.

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