This dataset shows the hourly sound pressure magnitude data measured underwater throughout the 18 months of experiment (11th of May 2023 – 31st of August 2024) in Helgoland (Margate) for different frequencies (10 Hz, 20 Hz, 30 Hz, 40 Hz, 50 Hz, 60 Hz, 70 Hz, 80 Hz, 90 Hz, 100 Hz, 200 Hz, 300Hz, 400 Hz, 500 Hz, 600 Hz, and 700 Hz) recorded by the HFNI valvometer. The mean sound pressure magnitude is also presented. Missing data corresponds to the stop of recording of the valvometer.
This dataset shows the hourly valve behavioral data of the 16 oysters Ostrea edulis throughout the 18 months of the experiment (11th of May 2023 - 31st of August 2024) in Helgoland (Margate) as well as the temperature recorded by the HFNI valvometer. The oyster valve behavior is characterized by 3 parameters: the Valve Opening Amplitude (VOA, the percentage of the valve opening relative to maximum opening), the Valve Opening Duration (VOD, the percentage of time that an oyster spends with its valves open), and the VOA/VOD. The data are presented for each oyster and as a group average. Missing data corresponds to the death of the oyster number 7 or to the stop of recording due to electrical failure on the oyster's valvometer electrodes.
Once widespread across European coasts, the native flat oyster Ostrea edulis has now disappeared from most of its historical range and is officially recognized as threatened. As a key ecological engineer, this species supports biodiversity by filtering water, stabilizing sediments, and providing complex reef habitats. Understanding and evaluating its behavior and biological rhythms in a natural environment before reintroduction, and how it responds to natural geophysical cycles, is essential to support effective restoration strategies. However, current knowledge on O. edulis remains limited, with most studies focusing primarily on reproduction under aquaculture or laboratory conditions. To help fill this gap, we conducted a 18-month in situ study to assess the valve behavior of Ostrea edulis in the field. The experiment took place at the Margate site (54.19°, 7.88°) near the island of Helgoland (Germany) from the 11th of March 2023 to the 31st of August 2024. The experimental setup consisted of 16 oysters disposed on individual cages in a customized oyster basket placed on a lander, a metallic structure immersed at 10m depth. Their valve behavior was continuously measured during 18 months using a High-Frequency Non-Invasive (HFNI) valvometer biosensor (Tran et al. 2023; Le Moal et al. 2023 for further details). Briefly, a pair of lightweight electrodes (<100 mg) was glued on each half-shell of each oyster and was linked to the HFNI valvometer by a flexible wire, allowing undisturbed oyster valve movement. An electromagnetic field was generated between the electrodes, allowing the measurement of the distance between each oyster's valve in continuous mode. In addition to the oyster behavior, environmental parameters were continuously measured underwater by the HFNI valvometer biosensor during the experiment, such as temperature and sound pressure magnitude. This compilation of datasets gives an overview of environmental parameters and behavioral data collected during this experiment.
Das Ziel der Kompensationsmaßnahme ist die Neuanlage von Austernbänken der Europäischen Auster Ostrea edulis zur Etablierung einer sich dauerhaft selbst erhaltenden Population - hier im Naturschutz- und FFH-Gebiet „Borkum Riffgrund“ in der deutschen Ausschließlichen Wirtschaftszone (AWZ) der Nordsee. Dazu wird in einem ersten Schritt eine Steinunterlage ausgebracht, auf der im zweiten Schritt Saataustern angesiedelt werden. Das Maßnahmenblatt gibt einen naturschutzfachlichen Rahmen für Planung und Durchführung der Kompensationsmaßnahme vor und wird bei Bedarf aktualisiert.
Das Ziel der Kompensationsmaßnahme ist die Neuanlage von Austernbänken der Europäischen Auster Ostrea edulis zur Etablierung einer sich dauerhaft selbst erhaltenden Population - hier im Naturschutz- und FFH-Gebiet „Borkum Riffgrund“ in der deutschen Ausschließlichen Wirtschaftszone (AWZ) der Nordsee. Dazu wird in einem ersten Schritt eine Steinunterlage ausgebracht, auf der im zweiten Schritt Saataustern angesiedelt werden.
In Europa gibt es keine Zuchtanlage, die schwerpunktmäßig heimische Austern produziert. Genau hier setzt das Bundesprogramm-Projekt an. Im Projekt soll auf Helgoland eine Zuchtanlage für die Europäische Auster aufgebaut werden. Diese Anlage wird benötigt, um in großem Maßstab junge Austern („Saataustern“) für eine spätere Wiederansiedlung in der deutschen Nordsee zu produzieren.
The testing and development project RESTORE, supported by the BfN with BMUV funding, is investigating methods for the restoration of the European oyster population in the German North Sea.
The presented data shows the results of suitability analyses to assess potential restoration grounds for ostrea edulis in the German Bight's marine protected areas (MPA) Borkum Reef Ground and Sylt Outer Reef. We made use of existing marine data from various sources and applied a spatial multicriteria decision analysis (MCDA). Spatial input variables are scored uniformly in order to express their respective ability to improve restoration preconditions. They are summed in a linear combination using expert's judgements founded weights using the analytical hierarchy process (AHP) algorithm. Datasets which describe circumstances to prevent a successful restoration are subtracted from the resulting suitable area. The dataset presented here includes the resulting raster datasets as described in out publication. Detailed metadata on the original raw data (not included here) are listed in Table 1 of the publication. The Analysis was performed in 2021 and modified in 2022.
The dataset includes oyster size and weight measurements used for calculating weight-to-weight transformation factors for oyster total, shell and soft tissue wet weight to dry weight (n = 30), developing a set of allometric and random forest models to estimate oyster total (n = 1241), shell (n = 240) and soft tissue (n = 120) wet weights. For the random forest models, the additional variables location and type (if oysters were single or clustered) were also considered. The size variables were shell Height (H, umbo hinge to longest edge), Length (L, longest distance across the valve) and Width (Wi, maximum distance between external surfaces of the umbo), these were all measured in mm to the closest 0.01 mm using a digital caliper. Oysters were collected and measured at the Nature conservation area Helgoländer Felssockel, Natura 2000 site Borkum Reef Ground, and offshore wind farm Meerwind Süd I Ost. The allometric models and transformation factors allow for the reuse of data, as well as estimation of further ecological parameters and indices. Furthermore, these models and transformations could greatly enhance the outcome of monitoring efforts by restoration programs.
Das Faltblatt zur Wiederansiedlung der Europäischen Auster erklärt, warum Europäische Austern ökologisch wichtig und im Fokus von Naturschutzmaßnahmen sind. Leicht verständliche Informationen zur Biologie der Europäischen Auster, Karten zur historischen Verbreitung und Wiederansiedlung sowie Fotos von Austern und Forschenden geben anschauliche Einblicke in aktuelle Aktivitäten zur Wiederansiedlung.
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