One may have encountered Red-eared Sliders in park ponds or reservoirs in Hong Kong. Did you know that this species is not native to this region? As a matter of fact, they originate from the US and Mexico. So how come such an exotic species ends up as one of the most widely distributed species in Hong Kong?
A juvenile Red-eared Slider (Trachemys scripta elegans) was found in a natural stream in Tai O during our ecological survey. As its name suggests, the "red ear" markings just behind its eyes and the yellow stripes around its neck make them hugely distinguishable. (Note: turtles do not have visible outer ears!)
This cute little reptile, a very popular pet, is commonly available in the pet stores along Tung Choi Street (also known as the "Goldfish Street"). Individual Red-eared Sliders may have been introduced into the wild because of their escape, owners' abandonment or practices of mercy release.
Red-eared Sliders are omnivorous, consuming plants and small animals such as crickets, fish, tadpoles and aquatic invertebrates. With their powerful adaptability, they serve as strong competitors against native turtle species. Given comparable ecological requirements, they compete with the native Reeves' Turtles (Mauremys reevesii), which were once abundant and widespread throughout Hong Kong. Such an intense competition has led to a gradual decline in the population of Reeves' Turtles in Hong Kong in recent years. Apart from the competition for both food and habitats, the turtles raised in captivity may have contracted diseases in the first place and then spread them to feral turtles upon release, thereby posing potentially serious harm to the populations of native species.
The above issues are not unique to Red-eared Sliders. Introducing exotic species to the wild may pose significant threats to the local ecosystem. Keeping small animals does not mean that the impacts to be caused will be relatively limited. Bear in mind that we have to think twice before making decisions to keep pets. It is imperative not to abandon them in an arbitrary manner, or such an act will harm other animals and even the entire ecosystem on Earth.