The objective of artificial seagrass is the development of suitable conditions for the restoration and growth of natural seagrass. Therefore, we will investigate the current circumstances at selected field sites. This work package aims to determine the hydrodynamic and ecological characteristics that favour and support the growth of Zostera marina as well as their natural variation.

Suitability of a site for seagrass growth depends on hydrodynamic (water depth, tidal variation, wave forcing), abiotic (nutrient budget, light availability, salinity), biotic (interactions with co-occurring species) and geomorphic (sediment composition, slope) conditions. A systematic literature review will provide first information of the range and knowledge gaps regarding these conditions followed by the investigation of transects through seagrass meadows at various stages of the annual cycle.

These field measurements will provide the basis for developing a predictive model of spatial distribution patterns of seagrass in the Baltic Sea of Schleswig-Holstein, Germany. Laboratory studies under controlled conditions enable us to evaluate threshold conditions for maximum wave energy and minimum light levels for seagrass growth. A mesocosm experiment with natural seagrass conducted at the lab facility of the Dutch partner will investigate further stressors. The shoot morphology of Zostera marina will be examined concerning its form and oscillation.

Thus, a near-natural appearance and behaviour of artificial seagrass will secure the high value of nature protection and tourism in the relevant shallow water areas.