Invasive species expansion in Spain and the EU

A study led by Ismael Soto of the Doñana Biological Station (CSIC) has analyzed the evolution of 39 species listed in the European catalogue of special concern. Using over 151,000 biodiversity records, the research published in Ecological Informatics reveals that many invasive species continue to expand across the Iberian Peninsula.

Key findings indicate that 24 species surpassed their inflection point in 2024, while 11 have reached a saturation phase, significantly limiting eradication possibilities. The tree of heaven (Ailanthus altissima) is noted for its massive footprint, occupying an estimated 150,000 square kilometers, which accounts for nearly one-third of the Peninsula.

Other widespread species mentioned include the red swamp crayfish (Procambarus clarkii) and the mosquitofish (Gambusia holbrooki). Researchers noted that while monitoring and eradication programs exist, challenges regarding time, personnel, and funding necessitate strict prioritization of interventions.