Pond slider
Trachemys scripta
The pond slider is a medium-sized freshwater turtle native to North America that has been introduced globally via the pet trade. It prefers still or slow-moving waters with soft bottoms and plenty of basking sites. It is characterized by colorful stripes on the head, neck, and limbs, and a flattened carapace that is bright green in juveniles. In Europe, it is classified as an invasive species that can displace native species.
Details
Identification
Streamlined carapace; yellow, orange, or red temporal stripes (depending on subspecies); yellow longitudinal stripes on neck and legs; plastron often with dark spots.
Social behavior
Forms groups when basking in exposed locations (log-sharing), otherwise largely solitary and competitive when food is scarce.
Diet
Omnivorous generalist; juveniles are predominantly carnivorous (insects, larvae, small fish), while adults increasingly prefer plant-based food (aquatic plants, algae).
Hunting strategy
Active underwater searching and ambush hunting for small vertebrates and invertebrates.
Spawning substrate
Sunny areas with little vegetation and diggable, sandy-loamy soil.
Overwintering
Hibernation (brumation) at the bottom of water bodies in mud or in burrows near the shore.
Ecology
Ecological role
Predator and consumer in the aquatic food web; in invasive ranges, a strong competitor to the European pond turtle for basking sites and food.
Natural predators
Raccoons, foxes, herons, and large predatory fish (especially for juveniles and eggs).
Competitor species
Emys orbicularis (European pond turtle).
Ecosystem service
Scavenging in water bodies and seed dispersal of aquatic plants.
Threats
Habitat loss in its native range; however, globally stable and widely distributed due to introduction.
Scientific profile
Profile
Distinguishing features
Characteristic post-orbital stripes (red or yellow); long, robust tail; males with extremely elongated claws on the forefeet; slightly serrated posterior margin of the carapace.
Habitat
Prefers stagnant or slow-moving freshwater habitats with soft substrates, abundant aquatic vegetation, and numerous basking sites. Also common in anthropogenic waters such as park ponds.
Diet
Omnivorous; juveniles are predominantly carnivorous (insects, crustaceans, tadpoles, small fish), while adults increasingly consume plant matter (aquatic plants, algae).
Role in food web
Invasive species in Europe; competes with the native Emys orbicularis for basking sites and food; can pressure local amphibian populations through predation.
Protection & threats
Main threats
Habitat loss in its native range; classified as an invasive alien species in Europe (EU Regulation 1143/2014), leading to trade and breeding bans to prevent further releases.
Population trend
Stable to increasing (widely distributed as an invasive species due to illegal releases in Europe).
Conservation measures
Management measures for population reduction in Europe; removal from the wild; information campaigns against the release of pets.