Crude oil and cadmium (Cd) are common pollutants in Ghana's coastal ecosystems, where the cyanobacterial phytoplankton Synechococcus sp. serves as the primary producer and forms the base of the marine food web alongside small grazers. We hypothesized that cadmium and crude oil would disrupt microbial community structure and function, with the strongest effects under combined exposure. This study investigates the toxic effects of Oil (2 mL L−1), Cd (4.4 μg L−1), and their combined impact (Cd + Oil) on functional groups within the coastal microbial community, including Synechococcus sp., heterotrophic bacteria, nanoflagellates, eukaryotic phytoplankton, ciliates, and dinoflagellates, as well as on copepod nauplii and copepodite development during six-day incubations. We observed acute toxic effects on heterotrophic ciliates and dinoflagellates, with >50 % reductions in abundance within 6 h and a marked decrease in diversity. Phytoplankton showed growth within the first 24 h due to nutrient replenishment from the protist decay, however, their growth continued to decline after 24 h, with Synechococcus being particularly sensitive to Cd and less affected by Oil. In contrast, heterotrophic bacteria increased in abundance across all treatments, likely benefiting from organic matter released during phytoplankton decay and their high adaptability. Notably, the bacterial genera Marivivens and Rhodovulum became dominant mainly in the Oil-amended treatments. Overall, the microbial groups exhibited diverse responses to the pollutants, with the combined Cd + Oil treatment exerting the strongest negative effects, while crude oil alone had the least impact. These findings highlight the vulnerability of tropical microbial food webs, typically dominated by Synechococcus and microbial grazers, to combined pollutant stress, with potential cascading effects on higher trophic levels and coastal ecosystem productivity. This highlights the need for comprehensive monitoring and conservation efforts in these globally significant, yet understudied, regions.
Across Europe, countries are joining forces in order to implement European Commission initiatives as the Blue Growth Strategy and the Directive on Maritime Spatial Planning. Collaboration on how to perform stakeholder involvement as well as create cross-border solutions has become a key issue around the European sea basins and holistic spatial planning approaches similar to terrestrial planning practices are now being implemented in the marine environment. Among the sectors in marine governance is the maritime cultural heritage under water as well as in the coastal zone, where the example of the Baltic Sea Region illustrates how this sector has become an inherent part of the new Blue Growth discourse and the MSP-policy development across the region. In order to utilise this potential, support for collaboration and shared understandings within the maritime cultural heritage community of practise is needed. This research has focused on how to develop a spatially enabled digital and collaborative working environment to support the co-creation of new shared spatial planning concepts for maritime cultural heritage. The development of the platform itself has been carried out in a close cooperation with the actual users including cultural heritage experts, public authorities and research institutes in the Baltic Sea Region.