API src

Found 6 results.

Other language confidence: 0.9145324111572516

Monitoring data (hard substrate, soft bottom) of the offshore wind farm alpha ventus (German Bight, North Sea)

Alpha ventus was the first German offshore wind farm build in the German exclusive economic zone in 2008/2009. The data are part of the mandatory monitoring programme of the German Standard Investigation of the Impacts of Offshore Wind Turbines on the Marine Environment (latest version: StUK 4, published by BSH 2014). Makrozoobenthos was collected in the offshore wind farm alpha ventus at four wind turbines at different depth (epifouling communities), distance-dependent to the turbines in the soft bottom, as well as randomly within the soft bottom of the offshore wind farm area and in a comparable reference area nearby. Samples were taken by scrape samples with scuba divers to analyse the epifaunal communities and with van-Veen grabs to analyse the infauna. Soft-bottom samples in the wind farm and reference area were collected in spring and autumn from 2008-2012 before, during and after construction (until three years) of the wind farm. After construction of the turbines, epifaunal community was evaluated for recording successional stages of growth on the wind turbines in different depth to cover the vertical zonation along the turbines (at 1, 5 and 10 m depth). Further, soft-bottom samples were collected distance dependent to the turbines 100, 200 and 400 m apart from the turbines. Biodiversity data of species include abundance (count data) and biomass (wet mass, g) per sample. Data were sampled on behalf of the DOTI GmbH & Co. KG in the framework of the mandatory monitoring and collected and quality controlled by the Federal Martime and Hydrographic Agency (BSH) in cooperation with AWI. Thus, we would like to thank the DOTI GmbH, particularly Magdalena Buchholz on behalf of the DOTI GmbH, as well as the BSH, in particular Dr. Maria Boethling, who kindly provided the data for scientific independent research analysis and publication.

Hardsubstrate data of offshore wind farms (DanTysk, Sandbank, Horns Rev) in the North Sea

Makrozoobenthic communties were collected at multiple at different depth of wind turbines. Samples were taken by scraping the organisms from the turbines into a net (scrape samples) by scuba divers to analyse the epifaunal communities. Samples were collected in three different wind farms: DanTysk (sampled in 2018, 2019) and Sandbank (2019) in the German exclusive economic zone (EEZ) and Horns Rev (2003-2005) in the Danish EEZ. Epifaunal community was evaluated for recording successional stages of growth on the wind turbines in different depth to cover the vertical zonation along the turbines. The data are part of the Danish monitoring data on offshore wind farms and the German Standard Investigation of the Impacts of Offshore Wind Turbines on the Marine Environment (StUK 4, published by BSH 2014). Data for each campaign comprise different turbines in the wind farms sampled by scuba divers using scrape samples. Biodiversity data of species include abundance (count data) and biomass (wet mass, g) per sample. Data were collected on behalf of Vattenfall in the framework of the mandatory monitoring. Thus we would like to thank Vattenfall who kindly provided the data for scientific independent research analysis and publication.

Small-scale study on benthic communities in the Sylt Outer Reef (German Bight, North Sea), 2006-2007

Makrozoobenthos of soft-bottom benthic communiy was collected by van-Veen grabs and beam trawls to sample the infauna and epifauna. Further, the data contains a few hauls with otter trawls to sample the demersal fish fauna. Sediment data are included to specify the soft-bottom habitat. Samples were collected in autumn 2006 and spring 2007. Benthic data were collected in the North Sea, German Bight in the area of the Sylt outer reef. Based on sediment maps and multibeam echo sounder images, 15 stations of different sediments were defined. The sediment distribution in the study area is very heterogeneous even at small scales, with fine sand sections alternating with coarse sand or gravel as well as individual large stones. This mosaic of different habitats causes different bottom fauna communities. Data for the two sampling campaigns comprise different stations in these differing sediment mosaic. Biodiversity data of species include abundance (count data) and biomass (wet mass, g) per sample.

Response of benthic communities to trawling cessation in the German Bight (North Sea, 2003-2004)

Makrozoobenthos of soft-bottom benthic communiy was collected by van-Veen grabs and beam trawls to sample the infauna and epifauna. Samples were collected between 2003 and 2004 in spring, summer and autumn each year. Benthic data were collected in the North Sea, German Bight off the East Frisian Coast. Benthic community was evaluated for potential changes after cessation of bottom trawling. In July 2003, the research platform FINO 1 was built as a pilot project for future offshore wind farms. The platform is located at 28 m water depth in the German Bight, 45 km off the Island Borkum. The surroundings of the platform (500 m radius) are closed for all shipping activities (except scientific activities) and are thus protected from trawling activities. Two zones beyond the 500 m radius, 9 km apart from the protected area in north-western and eastern direction were chosen as reference sites. Sampling follwed a BACI-design (before-after-control-impact), i.e. comparing the protected area to the further trawled areas. In both areas, protected and trawled area, sampling of the benthic community was carried out with “RV Heincke” during 2 periods. The first sampling period, defined as “pre-closure”, includes two sampling campaigns: one campaign 3 months before and one campaign 2 weeks after fishery closure of protected area (March/April and July/August 2003). “Post-closure” sampling was also carried out in two campaigns: one campaign in July/August and one campaign in September/October 2004, i.e. 12-14 months after fishery closure of protected area. Data for each campaign comprise different stations in the area, sampled by grab samples (infauna) and beam trawl samples (epifauna). Biodiversity data of species include abundance (count data) and biomass (wet mass, g) per sample, as well as sediment grain sizes, organic carbon, total carbon, nitrogen and sulfur content as accompanying environmental data.

Panel comparison observed in marinas in the north-eastern Baltic Sea

In the present study, we collected data on biofouling in 17 marinas along the Baltic Sea coast during three consecutive boating seasons (May-October 2014, 2015 and 2016). In this context, we compared different monitoring strategies and developed a fouling index (FI) to characterise marinas according to the recorded biofouling abundance and type (defined according to the hardness and strength of attachment to the substrate). Lower FI values, i.e. softer and/or less abundant biofouling, were consistently observed in marinas in the north-eastern Baltic Sea. The decrease in FI from the south-western to the north-eastern Baltic Sea was partially explained by the concomitant decrease in salinity. Nevertheless, most of the observed changes in biofouling seemed to be determined by local factors and inter-annual variability, which emphasizes the necessity for systematic monitoring of biofouling by end-users and/or authorities for the effective implementation of non-toxic antifouling alternatives in marinas.

Biofouling abundance and type observed in marinas in the north-eastern Baltic Sea

In the present study, we collected data on biofouling in 17 marinas along the Baltic Sea coast during three consecutive boating seasons (May-October 2014, 2015 and 2016). In this context, we compared different monitoring strategies and developed a fouling index (FI) to characterise marinas according to the recorded biofouling abundance and type (defined according to the hardness and strength of attachment to the substrate). Lower FI values, i.e. softer and/or less abundant biofouling, were consistently observed in marinas in the north-eastern Baltic Sea. The decrease in FI from the south-western to the north-eastern Baltic Sea was partially explained by the concomitant decrease in salinity. Nevertheless, most of the observed changes in biofouling seemed to be determined by local factors and inter-annual variability, which emphasizes the necessity for systematic monitoring of biofouling by end-users and/or authorities for the effective implementation of non-toxic antifouling alternatives in marinas.

1