Concrete is used in marine coastal constructions worldwide. These structures are colonized by specialized hard-bottom biota consisting of macroalgae and benthic macrofauna. As concrete manufacturers face challenges such as limited natural resources and high CO2-emissions, the need for supplementary materials increases. Still, there has been little research on the reaction of species to the differences in concrete composition and what ecological impact these reactions could have. This study addresses the questions (1) if there are differences in settlement communities, depending on differences in concrete constitutes and (2) if so, what are the consequences for the usability of alternative concretes in marine constructions. For the experiment 15 cubes (15 × 15 × 15 cm) made of five different concretes, containing different cements (Portland cement and blast furnace cements) and aggregates (sand, gravel, iron ore and metallurgical slags) were deployed in a natural hard bottom experimental field near Helgoland Island (German Bight) in April 2016. After 12 months, all cubes were examined regarding species composition and coverage, followed by statistical analysis (PERMANOVA, SIMPER, DIVERSE). Results indicate differences in settlement communities for different surface orientation (Top, Front/Back) of the cubes. Significant differences in settlement communities of the Front/Back side were present depending on the used material type. However, the found differences in settlement between the concrete types tested are not sufficiently clear to provide recommendations for their usability in coastal constructions.

混凝土在全世界的海洋沿海建筑中使用。这些结构被由大型藻类和底栖大型动物群组成的专门的硬底生物群落定居。随着混凝土制造商面临自然资源有限和二氧化碳排放量高​​等挑战，对辅助材料的需求增加。但是，关于物种对混凝土成分差异的反应以及这些反应可能产生的生态影响的研究很少。这项研究解决了以下问题：（1）根据混凝土成分的不同，居住社区是否存在差异；（2）如果存在差异，则对替代性混凝土在海洋建筑中的可用性有何影响？对于实验，用五种不同的混凝土制成15个立方体（15×15×15厘米），2016年4月，在Helgoland岛（德国湾）附近的天然硬底实验场中部署了包含不同水泥（波特兰水泥和高炉水泥）和骨料（砂，砾石，铁矿石和冶金炉渣）的水泥。12个月后，所有立方体对物种组成和覆盖率进行了检查，然后进行了统计分析（PERMANOVA，SIMPER，DIVERSE）。结果表明，对于立方体的不同表面方向（顶部，正面/背面），沉降社区的差异。根据所使用的材料类型，正面/背面的沉降社区存在显着差异。但是，所测混凝土类型之间沉降差异的发现还不够清楚，无法为它们在沿海建筑中的可用性提供建议。