The Underwater Visual Census (UVC) transects were carried out by scientific divers during the Heincke HE601 cruise focusing on developing and testing monitoring techniques at the Borkum Reef Ground and Sylt Outer Reef Marine Protected Areas. The UVC transects consisted of 1x1m sampling regions. To define these regions, divers used a 1m-long PVC pipe. At each sampling region, the diver spent approximately 1 minute counting and identifying, to the lowest taxonomic level possible, as many organisms as possible. The UVC transect provide insights into the general composition of key species, higher systematic groups and ecological guilds. Files included correspond to the observed organisms at each sampling region. Precise geographical coordinates for start/end of the transect, as well as that for individual sampling regions is unavailable.
The Underwater Visual Census (UVC) transect was carried out by scientific divers during the RESTORE expedition on board the ship Arctic Ocean during September 2021, focusing on the monitoring oyster pilot reefs and the ecology of benthic assemblages in the Borkum Reef Ground marine protected area. Due to logistic problems, only one of the two planned transects was done. The UVC transect consisted of seven 1x1m sampling regions. To define these regions, divers used a 1m-long PVC pipe. At each sampling region, the diver spent approximately 1 minute counting and identifying, to the lowest taxonomic level possible, as many organisms as possible. The UVC transect provide insights into the general composition of key species, higher systematic groups and ecological guilds. Files included correspond to the UVC video, as well as the abundance of organisms at each sampling region. Precise geographical coordinates for start/end of the transect, as well as that for individual sampling regions is unavailable.
The Underwater Visual Census (UVC) transects were carried out by scientific divers during the Heincke HE601 cruise focusing on developing and testing monitoring techniques at the Borkum Reef Ground and Sylt Outer Reef Marine Protected Areas. The UVC transects consisted of 1x1m sampling regions. To define these regions, divers used a 1m-long PVC pipe. At each sampling region, the diver spent approximately 1 minute counting and identifying, to the lowest taxonomic level possible, as many organisms as possible. The UVC transect provide insights into the general composition of key species, higher systematic groups and ecological guilds. Files included correspond to the observed organisms at each sampling region. Precise geographical coordinates for start/end of the transect, as well as that for individual sampling regions is unavailable.
The Underwater Visual Census (UVC) transects were carried out by scientific divers during the Heincke HE601 cruise focusing on developing and testing monitoring techniques at the Borkum Reef Ground and Sylt Outer Reef Marine Protected Areas. The UVC transects consisted of 1x1m sampling regions. To define these regions, divers used a 1m-long PVC pipe. At each sampling region, the diver spent approximately 1 minute counting and identifying, to the lowest taxonomic level possible, as many organisms as possible. The UVC transect provide insights into the general composition of key species, higher systematic groups and ecological guilds. Files included correspond to the observed organisms at each sampling region. Precise geographical coordinates for start/end of the transect, as well as that for individual sampling regions is unavailable.
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.
Imagery transects with a camera attached to a frame design for taking pictures in a 50 x 50 cm area. Seabed images transects were carried out by scientific divers during the RESTORE expedition on board the ship Arctic Ocean during September 2021, focusing on the monitoring of two pilot reefs (east and west) and the ecology of benthic assemblages in the Borkum Reef Ground marine protected area. The camera used was a Cannon EOS M6 camera, the pictures were taken perpendicularly to the seabed. The transects were done along a preset track across the reefs, number of pictures per transect varied based on diving time, with a minimum of 10 images per transect. Due to logistic problems, two transects were done for the east reef, and one for the west reef. The seabed images provide insights into the general composition of key species, higher systematic groups and ecological guilds. The images also contain valuable information on how benthic species are associated to each other. Dataset includes individual images, and metadata of each image including diving depth, date/time, and corresponding diver. Detailed geographical coordinates of individual images are unavailable.
The Underwater Visual Census (UVC) transect was carried out by scientific divers during the RESTORE expedition on board the ship Arctic Ocean during September 2021, focusing on the monitoring oyster pilot reefs and the ecology of benthic assemblages in the Borkum Reef Ground marine protected area. Due to logistic problems, only one of the two planned transects was done. The UVC transect consisted of seven 1x1m sampling regions. To define these regions, divers used a 1m-long PVC pipe. At each sampling region, the diver spent approximately 1 minute counting and identifying, to the lowest taxonomic level possible, as many organisms as possible. The UVC transect provide insights into the general composition of key species, higher systematic groups and ecological guilds. Files included correspond to the UVC video, as well as the abundance of organisms at each sampling region. Precise geographical coordinates for start/end of the transect, as well as that for individual sampling regions is unavailable.
The Underwater Visual Census (UVC) transect was carried out by scientific divers during the RESTORE expedition on board the ship Arctic Ocean during September 2021, focusing on the monitoring oyster pilot reefs and the ecology of benthic assemblages in the Borkum Reef Ground marine protected area. Due to logistic problems, only one of the two planned transects was done. The UVC transect consisted of seven 1x1m sampling regions. To define these regions, divers used a 1m-long PVC pipe. At each sampling region, the diver spent approximately 1 minute counting and identifying, to the lowest taxonomic level possible, as many organisms as possible. The UVC transect provide insights into the general composition of key species, higher systematic groups and ecological guilds. Files included correspond to the UVC video, as well as the abundance of organisms at each sampling region. Precise geographical coordinates for start/end of the transect, as well as that for individual sampling regions is unavailable.
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.
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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