Limnetica 37

We report the widespread occurrence of Trachemys scripta at Ria Formosa Natural Park, in sympatric conditions with native populations of Emys orbicularis and Mauremys leprosa, and the first confirmed case of successful reproduction in Portugal. The continuous naturalization reports of this invasive species, whose distribution has expanded worldwide in the last decades, confirm the need to implement urgent management measures for nature conservation, especially given the vulnerability of Emys orbicularis populations.