Eutrophication remains an environmental challenge in lagoons along the Southern Baltic Sea. Floating islands planted with emergent macrophytes are an option to remove nutrients from eutrophicated waters. Furthermore, floating wetlands offer other ecosystem services such as the provision of habitats. Numerous scientific studies have been conducted; however most remain on the laboratory scale. This research explores the challenges associated with installations in coastal environments and focuses on sustainability of the island design, the habitat function as well as nutrient removal. Most floating wetland designs use polyethylene, polypropylene, polyurethane or polyvinyl alcohol foam to ensure the buoyancy. For this study an artificial polymer free island design was developed and tested. The floating constructions in the Darss-Zingst-Bodden-Chain were planted with native macrophytes which have the potential to act as ‘biodiversity-supplements’ to the adjacent coastal wetlands: Bolboschoenus maritimus, Carex acutiformis, Iris pseudacorus, Juncus effesus, Lythrum salicaria, Schoenoplectus lacustris, Typha latifolia. The chosen macrophytes survived fluctuating salinities. After three months the above-ground biomass was harvested and analyzed for the nutrient concentrations. Phosphorus concentrations were highest in L. salicaria and nitrogen in I. pseudacorus. Video monitoring and field observations were applied in order to observe animals. Birds did not use the floating wetlands as breeding grounds, but the grey heron (Ardea cinerea) was a common visitor for foraging. Especially surprising was the large amount of juvenile eels (Anguilla anguilla). A diverse and large root network below the floating islands boosts not only nutrient removal but serves as a shelter and refuge for fish such as the endangered eel.

富营养化仍然是波罗的海南部泻湖中的一个环境挑战。种植有新出现的大型植物的浮岛是从富营养化水域中去除养分的一种选择。此外，浮动湿地还提供其他生态系统服务，例如提供栖息地。已经进行了大量科学研究；然而，大多数仍处于实验室规模。这项研究探讨了与沿海环境中的设施相关的挑战，并重点关注岛屿设计的可持续性、栖息地功能以及养分去除。大多数漂浮湿地设计使用聚乙烯、聚丙烯、聚氨酯或聚乙烯醇泡沫来确保浮力。对于这项研究，开发并测试了一种人造聚合物无岛设计。Bolboschoenus maritimus、Carex acutiformis、Iris pseudacorus、Juncus effesus、Lythrum salicaria、Schoenoplectus lacustris、Typha latifolia。选定的大型植物在盐度波动中幸存下来。三个月后，收获地上生物量并分析养分浓度。L. salicaria 中的磷含量最高，而I. pseudacorus 中的氮含量最高。应用视频监控和现场观察以观察动物。鸟类没有利用漂浮的湿地作为繁殖地，但灰鹭（Ardea cinerea）是觅食的常见访客。尤其令人惊讶的是大量的幼鳗（Anguilla anguilla）。浮岛下方多样化的大型根系网络不仅可以促进营养物质的去除，还可以为濒临灭绝的鳗鱼等鱼类提供庇护所。