Rewilding the Ina river for a cleaner Baltic Sea

Summary

The Szczecin Lagoon its surroundings is one of the most polluted parts of the Baltic Sea, contributing to the latter’s eutrophication. A number of small rivers in the Oder Basin discharge directly into the lagoon (especially the Gowienica and Ina rivers). This project was part of our partners’ long-term efforts to restore the Ina river system and the Oder Delta.

A planned expansion of the Natura 2000 area at the river could not be achieved. However, partnerships were established with anglers, kayak companies and forestry officials to ensure the sustainable use of river resources and reduce recreational pressure. Resting areas have been set up to channel tourist flows and prevent littering.

The most significant achievements, however, were the practical restoration measures. On a 1-km stretch of the river, three gravel prisms have been constructed to restore the natural morphology of the river. This improves spawning conditions for migrating fish, and it increases the water level, reconnecting the adjacent floodplains with the river and prompting further positive effects on invertebrates, birds and other species. In addition, shadow trees were planted in various sites, improving the conditions for the water crowfoot (Ranunculus fluitans) as an indicator for water quality and ecosystem health.