Turtles for Sale: Species Prevalence in the Pet Trade in Poland and Potential Introduction Risks

The popularity of exotic animals, including turtles, kept as pets, has grown steadily in recent decades. Limited awareness of the biological and ecological requirements of these species, combined with insufficient regulation in the pet trade, has contributed to frequent cases of release into the wild. Consequently, the risk of the introduction of non-native turtle species has increased; while not all introduced species establish viable populations or compete with native fauna, some compete for habitat and food resources, transmit pathogens and parasites, or disrupt ecosystem functioning. This study assessed the availability and prevalence of problematic turtle species in the Polish pet trade. Data were collected in 2024 from three main distribution channels: zoological fairs, pet shops, and online platforms, resulting in 1001 recorded observations. A total of 15 freshwater and 11 terrestrial turtle species were identified. The most frequently offered were members of the genus Pseudemys (49.5%) and Mauremys reevesii (13.84%)-both potentially invasive taxa already recorded in natural environments of several European countries. Additionally, species prohibited from trade in Poland, such as the pond slider Trachemys scripta and the false map turtle Graptemys pseudogeographica, were found among online listings, constituting a total of 3.03% of all observations. These results highlight a significant risk of further introduction of alien turtles into Poland's natural environments, posing a serious threat to biodiversity, including the endangered native European pond turtle Emys orbicularis. Urgent public education and additional legal regulations are needed for the pet trade to prevent the further spread of invasive turtle species in Poland and across Europe.