Trachemys scripta elegans (red-eared slider)
- Summary of Invasiveness
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Distribution Table
- Habitat List
- Biology and Ecology
- Means of Movement and Dispersal
- Pathway Causes
- Impact Summary
- Threatened Species
- Risk and Impact Factors
- Uses List
- Similarities to Other Species/Conditions
- Prevention and Control
- Principal Source
- Distribution Maps
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PicturesTop of page
IdentityTop of page
Preferred Scientific Name
- Trachemys scripta elegans Seidel 2002
Preferred Common Name
- red-eared slider
Other Scientific Names
- Chrysemys scripta (Boulenger 1889)
- Chrysemys scripta var. elegans Boulenger 1889
- Emys elegans Wied 1839
- Emys holbrooki Gray 1844
- Emys sanguinolenta Gray 1855
- Pseudemys scripta (Jordan 1899)
- Pseudemys scripta elegans Stebbins 1985
- Testudo scripta Schoepff, 1792
- Trachemys lineata Gray 1873
International Common Names
- English: slider
- French: tortue à tempe rouge; tortue de Floride
- Russian: Krasnoukhaya cherepakha
Local Common Names
- Bahamas: red-eared slider terrapin
- Denmark: Nordamerikansk terrapin; rødøret terrapin
- Finland: punakorvakilpikonna
- Germany: Buchstaben-Schmuckschildkröte; Rotwangen-Schmuckschildkroete; Rotwangen-Schmuckschildkröte
- Latvia: sarkanausu brunurupucis
- Lithuania: raudonausis vežlys; raudonskruostis vežlys
- Norway: rødøreterrapin
- Poland: zólw czerwonolicy; zólw czerwonouchy; zólw ozdobny
- Spain: punakõrv-ilukilpkonn
- Sweden: rödörad vattensköldpadda
Summary of InvasivenessTop of page
The red-eared slider (Trachemys scripta elegans) has been the most popular turtle in the pet trade with more than 52 million individuals exported from the United States to foreign markets between 1989 and 1997. Despite the vast worldwide occurrence of T. s. elegans, little is known of their impact on native ecosystems - clearly research and education on the dangers of releasing pet turtles into the wild are needed. Their omnivorous diet and ability to adapt to various habitats, gives them great potential for impacting indigenous habitats. This species has been nominated as among 100 of the "World's Worst" invaders.
Taxonomic TreeTop of page
- Domain: Eukaryota
- Kingdom: Metazoa
- Phylum: Chordata
- Subphylum: Vertebrata
- Class: Reptilia
- Order: Testudines
- Family: Emydidae
- Genus: Trachemys
- Species: Trachemys scripta elegans
Notes on Taxonomy and NomenclatureTop of page
The red-eared slider is a subspecies of pond slider (Trachemys scripta). Previously T. scripta was considered a widely distributed New World species consisting of 13 to 19 subspecies, however, today the Latin American taxa are included in other species and T. scripta only consists of the three North American subspecies, i.e. the red-eared slider (T. s. elegans), the yellow-bellied slider (T. s. scripta), and the Cumberland slider (T. s. troostii) (Bringsøe 2001a, Seidel 2002, in Bringsøe 2006).
DescriptionTop of page
Adult: The red-eared slider (Trachemys scripta elegans) is a medium-sized freshwater turtle (carapace length: 125 to 289 mm; Somma & Fuller 2009; 150 - 350 mm; Obst 1983) It is characterised by prominent yellow to red patches (typically red) on each side of the head (Scalera 2006). Carapace and skin are olive to brown with yellow stripes or spots; males are usually smaller than females and have a long, thick tail (Scalera 2006).
Eggs: The eggs are ovoid in shape, 31 to 43 millimetres long, 19 to 26 millimetres wide and weigh 6.1 to 15.4 grams (Bringsøe 2006).
DistributionTop of page
Native Range: The pond slider (Trachemys scripta) is present in eastern USA and adjacent areas of Mexico. It ranges from Virginia south-westward through to Florida, Alabama, Mississippi, Louisiana and Texas to Mexico. To the north, the distribution of T. scripta reaches through Kentucky and Tennessee to Ohio, Indiana, Illinois and Iowa, and west to Kansas, Oklahoma and New Mexico. The red-eared slider (T. scripta elegans) dominates within this species and has a western and central range. It occupies the Mississippi Valley from Illinois via parts of eastern New Mexico in the west to the Gulf of Mexico. T. scripta scripta has an eastern range and occurs from south-eastern Virginia to northern Florida. T. s. scripta overlaps with T. s. elegans in Alabama (and adjacent areas) and forms a zone of intergradation. T. scripta troostii has a small distribution and is found in the upper portions of the Cumberland and Tennessee rivers, from south-eastern Kentucky and south-western Virginia through Tennessee to north-eastern Alabama. (Native range description taken from Bringsøe 2006).
Known Introduced Range: The release of pond sliders has occurred in Europe (Warwick 1991, in Cadi et al. 2004), Africa (Newberry 1984, in Cadi et al. 2004), South America (Girondot Pers. Obs., in Cadi et al. 2004) and Asia (Warwick 1991, Moll 1995, Chen and Lue 1998, in Cadi et al. 2004). Pondslider generally have a scattered distribution in the North European and Baltic region, with occurrences in or near urban areas (Bringsøe 2006). T. s. elegans is found in Europe, South East and Far East Asia, the Caribbean, Israel, Bahrain, Mariana Islands, Guam and South Africa. In Europe, it occurs in several countries, but apparently breeds only in a few (e.g. Spain, Italy, and France) (DASIE, 2012).
Distribution TableTop of page
The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.
|Continent/Country/Region||Distribution||Last Reported||Origin||First Reported||Invasive||Reference||Notes|
|-Hong Kong||Present||Introduced||ISSG, 2011|
|-Ryukyu Archipelago||Present||Introduced||Invasive||ISSG, 2011|
|Korea, DPR||Present||Introduced||ISSG, 2011|
|Korea, Republic of||Present||Introduced||1970s||Invasive||ISSG, 2011|
|Sri Lanka||Present||Introduced||ISSG, 2011|
|South Africa||Present||Introduced||Invasive||ISSG, 2011|
|-Canary Islands||Present||Introduced||ISSG, 2011|
|Bermuda||Restricted distribution||Introduced||1950s||Invasive||ISSG, 2011|
|-British Columbia||Present||Introduced||Invasive||ISSG, 2011|
|Mexico||Present||CAB ABSTRACTS Data Mining 2001|
|-Georgia||Present||CAB ABSTRACTS Data Mining 2001|
Central America and Caribbean
|British Virgin Islands||Present||Introduced||ISSG, 2011|
|Cayman Islands||Present||Introduced||ISSG, 2011|
|Costa Rica||Present||Introduced||ISSG, 2011|
|Dominican Republic||Present||Introduced||ISSG, 2011|
|Puerto Rico||Present||Introduced||Invasive||ISSG, 2011|
|Saint Lucia||Present||Introduced||Invasive||Krauss, 2012||Escaped/released from captivity; likely to impact aquatic ecosystems, e.g. through predation|
|Trinidad and Tobago||Present||Introduced||ISSG, 2011|
|Austria||Restricted distribution||Introduced||Invasive||ISSG, 2011|
|Czech Republic||Present||Introduced||1960s||ISSG, 2011|
|-Balearic Islands||Present||Introduced||ISSG, 2011|
|UK||Present||Present based on regional distribution.|
|-England and Wales||Present||Introduced||Invasive||ISSG, 2011|
|Australia||Present||Introduced||1960s onwards||Invasive||ISSG, 2011|
|-New South Wales||Present||Introduced||Invasive||ISSG, 2011|
|French Polynesia||Present||Introduced||ISSG, 2011|
|Micronesia, Federated states of||Present||Introduced||ISSG, 2011|
|New Caledonia||Present||Introduced||ISSG, 2011|
|New Zealand||Present||Introduced||ISSG, 2011|
|Northern Mariana Islands||Present||Introduced||ISSG, 2011|
HabitatTop of page
Within their natural range pond sliders (Trachemys scripta) live in a wide variety of freshwater habitats including rivers, ditches, swamps, lakes and ponds (Bringsøe 2006). They prefer large quiet water bodies with soft bottoms, an abundance of aquatic plants and suitable basking sites (Carr 1952, Ernst et al. 1994, Bringsøe 2001b, in Bringsøe 2006). Although they prefer quiet waters, red-eared sliders (Trachemys scripta elegans) are highly adaptable and can tolerate anything from brackish waters, to manmade canals, and city park ponds (Ernst et al. 1994, Cox et al. 1998, Salzberg 2000, in Somma & Fuller 2009). Small pond sliders usually limit their activity to areas of heavy floating vegetation. It is thought that pond sliders do not feed or grow beyond a temperature range of 10°C to 37°C (Ramsay et al. 2007).
In Europe, T. s. elegans is generally released in freshwater areas that are frequented by humans, such as public ponds which are considered of low biological value (e.g. Kordges 1990, Thiesmeier & Kordges 1990 1991, in Bringsøe 2006). Natural habitats close to urban areas are also used for releases (Bringsøe 2006). Natural reproduction of the red-eared slider in Europe under Mediterranean climate conditions has been reported (Luiselli et al. 1997, Martinez-Silvestre et al. 1997, Cadi et al. 2003, in Cadi & Joly 2003). The occurrence of T. s. elegans in a tropical urban polluted river in Brazil supports evidence of its capacity to use anthropogenic environments. Polluted rivers can offer a high amount of organic residues and food items, which can represent an advantage for such a generalist freshwater turtle species (Moll 1980, Lindeman 1996, Souza & Abe 2000, in Ferronato et al. 2009).
Habitat ListTop of page
|Lakes||Present, no further details|
|Rivers / streams||Present, no further details|
|Riverbanks||Present, no further details|
|Wetlands||Present, no further details|
Biology and EcologyTop of page
The red-eared slider (Trachemys scripta elegans) is an opportunistic omnivore subsisting on a wide variety of plants and animals (Ernst et al. 1994, in Bringsøe 2006) including filamentous algae, macrophytes, snails, Diptera (larvae and pupae), terrestrial insects, crustaceans and small vertebrates (Chen & Lue 1998, Prévot-Julliard et al. 2007, in Ferronato et al. 2009). Juveniles are mainly carnivorous and as they grow older they become more herbivorous (Bringsøe 2006). Prévot-Julliard et al. (2007) found a decrease of invertebrate consumption with age of the turtle. Carr (2008) observed specimens of red-eared slider consuming grass blades (southern watergrass and teal lovegrass). Adult T. s. elegans will still opportunistically eat aquatic invertebrates (especially insects and molluscs), fish, frog eggs, tadpoles and aquatic snakes (Ernst et al. 1994, Brown et al. 1995, in Somma & Fuller 2009). T. s. elegans in seminatural basins in Milan (northern Italy) selected insects (40%) over most other food items (Agosta & Parolini 1999).
In northern Taiwan all feral T. s. elegans sampled were found to have ingested animal materials (mostly snails, fish, adult and larval flies and unidentifiable terrestrial insects) and 76.5% were found to have ingested plant materials (Chen & Lue 1998, in Outerbridge 2008). Conversely, Outerbridge (2008) found that only 77.8% of feral red-eared sliders examined in Bermuda had ingested animal materials whereas 86.1% had ingested plant materials. Most of the vegetative matter consisted of leaves, stalks, roots, seeds and flowers; however, filamentous and blue-green algae were also occasionally ingested. Nearly half of the animal material ingested comprised aquatic and terrestrial insects. Small fish, freshwater snails and bird remains occurred less frequently in the samples (Outerbridge 2008).
Prévot-Julliard et al. (2007) found fish remains in the stomachs of red-eared sliders. The size of fish scales found (some up to 12 mm in diameter) indicates that the scales would have belonged to fish of around 20cm (J.Y. Sire, Pers. Comm., in Prévot-Julliard et al. 2007). As it is unlikely that a slider turtle would be rapid enough to catch a 20 cm fish, perhaps the turtle acted as a necrophagous species, as other species of freshwater turtles do (Spencer et al. 1998, in Prévot-Julliard et al. 2007).
Prévot-Julliard et al. (2007) found four individuals which had ingested terrestrial ants, and the stomach of one turtle was full of them. Although terrestrial activity is known for this species (Bennett et al. 1970, Gibbons 1970, in Prévot-Julliard et al. 2007), only a few reports are available for terrestrial foraging (Cagle 1944, Chen & Lue 1998, in Prévot-Julliard et al. 2007). The terrestrial activity of T. s. elegans is a key component for the colonisation of new habitat (Parker 1990, in Prévot-Julliard et al. 2007) making further investigation into this aspect of the turtle’s behaviour warranted.
Sexual maturity is reached in the third to fourth year (Obst 1983, Pupins Unpub. Data, in Pupins 2007). Pond sliders exhibit complex courtship behaviour in the water. The female usually excavates a nest on the shore of a freshwater body or on beaches in places such as Costa Rica (Bringsøe 2006; Scalera 2006). Females may move as far as 1.6 kilometres to find a suitable nest site; the jug-shaped nest is generally up to 12 centimetres deep (Bringsøe 2006). Depending on body size and other factors, up to six clutches a year containing up to 30 eggs may be laid; mean values of natural populations are around 6 to 11 eggs per clutch (Bringsøe 2006; Scalera 2006). Mean annual fecundity for T. s. elegans in Illinois and Louisiana is close to the 30 eggs per year (estimated by Cagle 1950 and Thomhill 1982, in Tucker 2001). Mean annual fecundity estimates for T. s. scripta from South Carolina seem exceedingly low in comparison (Tucker 2001). Incubation of pond slider eggs takes 59 to 112 days (Scalera 2006). Hatching times of T. s elegans are weather dependent: temperatures between 22°C to 30°C for 55 to 80 days are preferred (Pendlebury 2006, in Pupins 2007). Hatching of eggs requires 50 to 60 days at 26 °C. Longevity of pond sliders is approximately 20 years in the wild and 40 years in captivity.
In its introduced range in Europe, egg deposition has been observed in Spain (de Roa and Roig, 1997; Martinez-Silvestre, 1997; Bertolero and Canicio, 2000; Capalleras and Carretero, 2000, in Cadi et al. 2004), and near Paris, France (Moran Pers. Comm., in Cadi et al. 2004). However, sex determination of the Trachemys embryos is temperature-dependent, with cooler incubation temperatures producing only males, and warmer incubation temperatures only females (Ewert et al. 199, in Cadi et al. 2004). Therefore, incubation temperature could be a limiting factor for the invasion of this species in parts of Europe, if hatchlings of only one sex are produced in the wild (Cadi et al. 2004). A strong bias towards female red-eared sliders has been detected in capture sampling in France. This may reflect a potential strong female bias amongst imported juveniles: incubating eggs at high temperature is favoured by pet traders because it leads to rapid hatching; however it tends to produce females. (Godfrey et al. 2003, in Prévot-Julliard et al. 2007).
Red-eared sliders can live for about 40 years (Scalera 2006). Therefore, even if reproduction may not occur in the introduced range, they remain there for many years.
Means of Movement and DispersalTop of page
Introduction pathways to new locations
Pet/aquarium trade: Since the 1970s, massive numbers of young pond sliders have been generated on turtle farms in the USA for the pet trade. The most commonly exported subspecies is the red-eared slider T. s. elegans, with more than 52 million individuals being produced for foreign markets between 1989 and 1997 (Telecky 2001, in Cadi et al. 2004). As pond sliders are often sold as small hatchlings (three to four centimetres carapace length), unsuspecting owners are rarely prepared to continue maintaining them in captivity when the turtles reach adulthood (up to 30 centimetres carapace length) (Cadi et al. 2004). Often, larger turtles are released by their owners;this has led to the introduction of many red-eared slider turtles into natural ecosystems (Cadi et al. 2004). This interest in pet turtles may have reached a peak during the Teenage Mutant Ninja Turtle television cartoon craze of the late 1980s and early 1990s (Somma & Fuller 2009).
Local dispersal methods
Intentional release: As red-eared sliders reach adulthood, many are released by their owners into natural ecosystems (Cadi et al. 2004).
Natural dispersal (local): Red-eared sliders may disperse up to 2 km to lay eggs (Gibbons et al. 1983, in O'Keeffe 2009).
Pathway CausesTop of page
Impact SummaryTop of page
ImpactTop of page
For a detailed account of the environmental impacts of red-eared sliders Trachemys scripta elegans please read: Trachemys scripta elegans (red-eared slider) Impacts Information. T. s. elegans has been the most popular turtle in the pet trade with more than 52 million individuals exported from the United States between 1989 and 1997 (Telecky 2001, in Bunnell 2005). Red-eared slider turtles became very popular because of their small size, their simple husbandry requirements and their reasonably low price (Teillac-Deschamps et al. 2008). Unsuspecting turtle owners were rarely prepared to maintain large adults (up to 30 cm carapace length) for a significant length of time (up to 50 years) in captivity (Teillac-Deschamps et al. 2008). Larger adult turtles were released by their owners to ponds in many places and because of this, red-eared sliders now occur in freshwater ecosystems in many developed countries with high densities in urban wetlands (de Roa & Roig 1997, Luiselli et al. 1997, Arvy & Servan 1998, Chen & Lue 1998, Lever 2003, Martinez-Silvestre et al. 2003, in Teillac-Deschamps et al. 2008).
Competition: The competitive advantages of the slider over native freshwater turtle species may include lower age at maturity, higher fecundity, and larger adult body size (Arvy & Servan 1998, in Cadi & Joly 2003). Red-eared sliders may compete for food, egg-laying sites, or basking places (Bury & Wolfheim 1973, Bury et al. 1979, Rovero et al. 1999, Lindeman 1999, in Cadi & Joly 2003). The red-eared slider has also been considered occasionally aggressive towards other individuals (Cadi & Joly 2003) and more recently, aggressive interactions with the Spanish terrapin (Mauremys leprosa) have been demonstrated (Polo-Caiva et al., 2011).
In a study by Cadi and Joly (2003), the endangered (now listed by IUCN as Near-Threatned) European pond turtle (Emys orbicularis galloitalica) was shown to shift basking activity towards places considered to be of lower quality, when in competition with the red-eared slider, which was able to occupy the better basking sites. A study by Polo-Cavia (2010a) suggested that an endangered turtle species, the native Spanish terrapin (Mauremys leprosa) was displaced from basking sites when competing with introduced T. s. elegans. Polo-Cavia et al. suggest that the red-eared terrapin’s competitive advantage might derive from its large body size, or behavioural adaptions related to high levels of interspecific competition in its native range. The decreased basking activity of native M. leprosa that results from competition with T. s. elegans may lead to ineffective thermoregulation and therefore, a loss in the efficiency of physiological functions, such as digestion or locomotor performance. This in turn could favour expansion of invasive T. s. elegans. Other studies have also shown red-eared sliders to compete with indigenous species for food and basking sites (Frank & McCoy 1995, Williams 1999, Salzberg 2000, in Somma & Fuller 2009).
Red-eared sliders probably compete directly for food with native freshwater turtles. Indeed, both native and invasive freshwater turtles are predators of amphibian tadpoles. Polo-Cavia (2010b) showed that tadpoles exhibited innate anti-predator behaviour in response to chemical cues from native freshwater species but that there was no such response to equivalent chemical cues of the red-eared sliders. This may allow red-eared sliders to more easily exploit their prey and hence outcompete native species.
Threat to Endangered Species: Competitive interactions between T. s. elegans and the European pond turtle (Emys orbicularis) and the Spanish terrapin (Mauremys leprosa) are of particular concern. In Washington (USA) they are a potential threat to the Pacific pond turtle (Clemmys marmorata), a declining species endemic to the Pacific states (Brown et al. 1995, Williams 1999, in Somma & Fuller 2009).
Disease Transmission: Continuous releasing of exotic pet turtles in natural ecosystems increases the risk of parasite transmission to native species, and highlights the impending need for regulation of pet turtle trade in Europe (Hidalgo-Vila et al. 2008); the red-eared slider is known to carry nematodes (Hidalgo-Vila et al. 2008).
Predation: Turtles introduced near Paris were revealed to have consumed aquatic plants and animals (mostly arthropods and molluscs, Prévot-Julliard et al. 2007, in Teillac-Deschamps et al. 2008).
Human Health: Reptiles, including turtles, are well-recognised reservoirs for Salmonella, and are a source of human salmonellosis (Nagano et al. 2006).
Ecosystem Change: The impacts of T. s. elegans on natural habitats and ecosystems are unknown; should the red-eared slider be released in natural habitats with high ecological value, it would be relevant to monitor any consequences on native fauna and flora, including invertebrates, amphibians, native turtles and nesting birds (Bringsøe 2006).
Threatened SpeciesTop of page
|Threatened Species||Conservation Status||Where Threatened||Mechanism||References||Notes|
|Emys orbicularis||No Details|
Risk and Impact FactorsTop of page Invasiveness
- Is a habitat generalist
- Capable of securing and ingesting a wide range of food
- Negatively impacts human health
- Threat to/ loss of endangered species
- Competition - monopolizing resources
- Pest and disease transmission
- Highly likely to be transported internationally deliberately
Uses ListTop of page
- Pet/aquarium trade
- Ritual uses
Similarities to Other Species/ConditionsTop of page
Besides its distinctive red flashes the red-eared slider (like all turtles exotic to Australia) can also be identified by the way it retracts its head straight back into the shell; in comparison, all native Australian turtles wrap their heads around to the side of their shell (NRM&W).
Prevention and ControlTop of page
Preventative measures: With effect from 22 December 1997 the EU banned the import of the subspecies T. scripta elegans via the Protection of Species of Wild Fauna and Flora by Regulating Trade (Bringsøe 1998, 2001b, Bringsøe 2006). Although it is no longer allowed to import the red-eared slider within the EU, it is still legal to keep and distribute them within many EU countries.
After the legislation was passed the red-eared slider was semi-replaced in the market by other North American turtles which fetch higher prices and are imported in lower quantities (Adrados et al. 2002, in Bringsøe 2006). This may change if American turtle farmers manage to improve breeding success of these species in turtle farms. Unfortunately some of the species replacing the red-eared slider in the market are substantially better adapted to cold climates (such as Nova Scotia and Siberia, respectively) and probably represent a higher ecological risk; they are cryptic species and are significantly more carnivorous than the red-eared slider (P.P. van Dijk Pers. Comm. 2006).
In Australia, the red-eared slider is present in isolated populations but risk assessment by the Department of Agriculture & Food, Western Australia (DAFWA) indicates that populations could establish further and become widespread (National Animal Pest Alert, 2009). The Risk Assessment for the pond slider (Trachemys scripta), produced an establishment risk rank of EXTREME.
Physical: Red-eared sliders can be captured by hand or through various trapping devices. Please visit Fyke Net for Turtles for information about turtle nets. Floating boards used by sliders as basking sites seem very effective when equipped with baited cages on top (Scalera, 2006). Sniffer dogs can be used to detect and remove both turtles and their eggs; eggs can also be found and removed by following females at nesting areas (Scalera, 2006).
In parts of Asia animals are released into the wild as a part of a traditional Buddhist mercy ceremony to increase good karma, honour Buddha and repent for ones sins. The Ministry of the Environment (Republic of Korea) advised that people should consider taking care of injured birds and animals and then set them free for a more environmentally-friendly symbolic act.
Knowledge and Research: The ecological effects of introductions of T. s. elegans have been poorly documented (Platt & Fontenot 1992, in Ramsay et al. 2007). Competition of T. s. elegans with the 'Lower Risk/Near Threatened (NT)' indigenous European pond turtle (seeEmys orbicularis in the IUCN Red List of Threatened Species) has been studied in France (see Cadi & Joly 2003). A French management project for the red-eared slider was initiated by the laboratory “Ecologie, Systématique and Evolution” (CNRS-University Paris-Sud) (Cadi et al. 2008).
BibliographyTop of page
Citations from GISD
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ReferencesTop of page
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ContributorsTop of page
- Reviewed by: Paul Pendelbury, REPTRANS UK
- Last Modified: Wednesday, May 26, 2010
Distribution MapsTop of page
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