Tides play a fundamental role in shaping and maintaining coastal ecosystems, especially in marshes and estuaries. The interrelationship between tidal flows and these natural spaces is key to biodiversity and environmental balance. In the context of the Basque coast, the Provincial Council of Gipuzkoa has launched an ambitious ecological restoration project in Jaizubia, within the Txingudi marshes . The main objective is to recover the natural dynamics of the tides and re-establish the flooding and drainage processes characteristic of these valuable habitats.
Currently, many salt marshes have had their connection to the tides disrupted by artificial infrastructure such as weirs, dikes, and drainage systems, leading to a loss of biodiversity and increased vulnerability to extreme weather events. Restoring the natural flow of the tides not only benefits the environment but also has positive repercussions for climate change adaptation , strengthening the resilience of these areas to sea-level rise and flooding.
Restoration work in Txingudi: progress in coastal ecology
The main actions in this project are focused on removing barriers that impeded the free movement of seawater, such as mudflats, and carrying out a thorough cleanup of waste, some of it hazardous (construction debris, abandoned tanks, and other pollutants). The plan also includes the removal of invasive species, such as bamboo, and the planting of native marsh vegetation to promote ecological recovery.
These actions aim not only to restore tidal dynamics and improve habitats of interest, but also to promote the estuary's ecological connectivity . Thanks to this, organisms that depend on the ebb and flow of the tides will be able to move in and out more easily, fostering the area's biodiversity. To expand your knowledge on this topic, we recommend consulting what storm surges are and their impact.
The project is funded by European funds through the Next Generation EU program, with significant investment in both the work at Jaizubia and future projects planned through the LIFE Wetlands project. This strategy expands the scope of the restoration effort to other wetlands in Gipuzkoa, thus reinforcing the region's commitment to the conservation and sustainable management of its coastal natural resources.
International importance and legal protection of marshes
The Txingudi marshes are included in the Natura 2000 network , forming part of a Special Area of ​​Conservation and a Special Protection Area for Birds. It is the only site of its kind in Gipuzkoa, and its European and international importance is further evidenced by its recognition as a Wetland of International Importance.
In total, more than 250 bird species have been identified in these marshes , including resident, migratory, and wintering birds. The recovery of species like the otter, which returned after decades of absence, is another indicator of the success of the interventions and the capacity of these areas to recover when natural conditions are restored. To better understand how these areas contribute to biodiversity conservation, you can explore the Trafalgar tombolo and its geological history.
Acting on tides and their dynamics means investing in our ecological future and security from growing natural threats, protecting these valuable sites for future generations.
