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- W2279113089 abstract "To enhance the production of renewable energy in Belgium, offshore wind farms are being constructed on the Thorntonbank and Bligh Bank in the Belgian part of the North Sea (BPNS). Knowledge on the soft-sediment macrobenthos in these offshore areas has increased by carrying out baseline studies (Year-0) at the Thorntonbank and Bligh Bank during respectively, 2005 and 2008 (De Maersschalck et al, 2006; Reubens et al, 2009b). To detect any changes in biotic (macrobenthic density, diversity, biomass and species dominance) and abiotic (median grain size, total organic enrichment and mud content) variables a BACI (Before After Control Impact) strategy is applied. The aim of following monitoring project is to evaluate the Year-2 situation at the Thorntonbank and the Year-1 situation at the Bligh Bank and increase the knowledge on the temporal and spatial variability of the macrobenthos in these areas. Samples at the Bligh Bank and Goote Bank do not show any significant changes in sediment composition in comparison to the baseline study in 2008. Sediments are characterised by medium, coarse sands (250-500μm) with a very low mud content (max. mean of 0.121 ± 0.082 %) and low percentages of total organic matter (0.818 ± 0.053%). The macrobenthic densities are significantly lower than 2008 with a range from 770 to 1060 ind./m². Species richness (N0) illustrated a comparable range to 2008 from 1 to 24 species/m² and broader ranges in biomass (3.48 – 37419.65 mg/m²) were also found for the Bligh Bank and Goote Bank. Nephtys cirrosa is the dominant species at all locations with Bathyporeia guilliamsoniana as a second dominant species on the edge area of the Bligh Bank. Samples taken at the Thorntonbank and Goote Bank do not show any significant changes in sediment composition in comparison to the baseline study in 2005 either. Sediments are characterised by medium, coarse sands (250-500μm) with low percentages of total organic matter (0.818 ± 0.053%) and without the presence of mud at the Thorntonbank. The macrobenthic densities vary from 770 to 1930 ind./m² and are only significantly lower compared to 2005 for the eastern concession area on the Thorntonbank (TBI B). Species richness ranges from 1 to 24 species/m² and biomass from zero to 21690.13 mg/m². All locations are dominated by the polychaete Nephtys cirrosa and also by Spiophanes bombyx at the reference site on the Thorntonbank. Overall, we can conclude that the results for the Year-2 situation at the Thorntonbank and the Year-1 situation at the Bligh Bank, illustrate the natural temporal variability that can appear in macrobenthic communities. In order to detect any (cumulative) impacts of the offshore wind farms, the long term monitoring must therefore be continued over a longer period. A recommendation has been made to reduce the amount of sampling sites for the long-term monitoring campaign in the future and subsequently increase the amount of replicas and the reliability of the results. Furthermore, a targeted monitoring around one turbine on the Thorntonbank will be carried out during 2010 to detect any impacts on the soft sediment macrobenthos due to the increased epifaunal communities colonizing the turbines (Kerckhof et al, 2009)." @default.
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- W2279113089 date "2010-01-01" @default.
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- W2279113089 title "Monitoring the effects of offshore wind farms on the soft substratum macrobenthos: year-1 Bligh Bank and year-2 Thorntonbank" @default.
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