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• W4387431611 endingPage "108521" @default.
• W4387431611 startingPage "108521" @default.
• W4387431611 abstract "Sand nourishment is a widespread management strategy to protect sandy coasts against coastal erosion. Nourishments can impact the benthic fauna directly by burial and indirectly by changing environmental conditions such as bottom shear stress and/or sediment composition (grain size distribution). The macrobenthic community in soft-bottom environments is often strongly correlated with sediment composition, however, because of the strong correlation with other environmental conditions, it is difficult to determine the direct effects of sediment composition on the macrobenthic community from field observations. Nourishments can temporarily break this correlation allowing to study the relation between sediment composition and macrobenthos community more or less independent from other environmental factors. In 2017, a shoreface nourishment was constructed at the Holland coast near Callantsoog at a water depth of about 10 m. Because the influence of waves is limited at this depth, the nourishment is not very mobile. Sediment composition and macrobenthos was monitored at the nourished site and two reference locations before (2015 and 2016), and four years after (2021) nourishment. In 2021, the sediment composition at the nourished site was much coarser (330 ± 59 μm) than in the years before nourishment (195 ± 34 μm), while the sediment composition at the reference locations remained comparable between the years. The average number of taxa per sample at the nourishment decreased from 14.1 before nourishment to 3.0 taxa in 2021. Also the average total density at the nourishment location decreased from 12731 ind.m−2 before nourishment to 320 ind.m−2 in 2021. While before nourishment, the composition of the macrobenthic community at the nourished site was comparable to the southern reference location, in 2021 the macrobenthic community was more comparable to the community at the coarser sediments of the northern reference. Clearly, four years after the nourishment, the macrobenthic community has not recovered due to the presence of coarser sediments at het nourished site. Logistic regressions show that most of the dominant species have a negative relation with median grain size, but some species are more sensitive to changes in sediment composition than others. The sensitivity of the macrobenthos to sediment composition illustrates the importance of using sediments of similar grain size as in the placement area, especially for nourishments in the shoreface." @default.
• W4387431611 created "2023-10-08" @default.
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• W4387431611 date "2023-10-01" @default.
• W4387431611 modified "2023-10-18" @default.
• W4387431611 title "Changed sediment composition prevents recovery of macrobenthic community four years after a shoreface nourishment at the Holland coast" @default.
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• W4387431611 doi "https://doi.org/10.1016/j.ecss.2023.108521" @default.
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