Invasive alien species are one of the main global threats to biodiversity, representing the second leading cause of biodiversity loss after habitat destruction. In the marine ecosystems of the western Mediterranean, particularly along the coasts of Occitanie and Catalonia, these species often remain at low densities before becoming invasive and causing significant ecological and socio-economic impacts.
The ALIEN‑OCCICAT project aims to improve early detection, monitoring, and understanding of the dynamics of non-indigenous marine species in this cross-border region. To achieve this, it combines scientific methodologies such as taxonomic monitoring and environmental DNA analysis with active involvement from natural area managers and citizens.
The project fosters a transboundary cooperation network among researchers, public authorities, stakeholders, and citizens to share data, enhance coordination, and overcome fragmentation of existing initiatives.
A key case study is the blue crab (Callinectes sapidus), an invasive species that is already disrupting food webs, traditional fisheries, and ecosystem services. CEAB will also focus on the invasive polychaete Alitta succinea, which in various locations has already begun to displace native species, as well as on the creation of 3D models of some of the target species for scientific and outreach purposes.
By improving knowledge of ecological processes, ALIEN‑OCCICAT seeks to anticipate changes in species status, develop effective management strategies, and raise public awareness about biological invasions.
- Project aligned with EU goals on biodiversity protection and invasive species management.
- Combines research, environmental management, and citizen engagement.
- Strong territorial and applied focus with direct relevance for coastal management.
