Amphibians and Reptiles of Seychelles
The Seychelles islands support a remarkable range of amphibians and reptiles found no-where else in the world. NPTS works actively to conserve these species through research, monitoring and habitat management. The data collected by NPTS is published in scientific papers and contributed to the Global Amphibian Assessment and the Global Reptile Assessment.
6 species of caecilian are known from the islands. These legless burrowing amphibians are very poorly known and the NPTS is researching their current status and ecology. We are developing a monitoring programme for all Seychelles caecilians.
Grandisonia alternans, Grandisonia brevis, Grandisonia larvata, Grandisonia sechellensis, Hypogeophis rostratus, Praslinia cooperi
6 species of frogs have been identified in Seychelles. These comprise the Mascarene frog Ptychadena mascariensis (probably introduced), the Seychelles tree frog (Tachycnemis seychellensis) and four species of the endemic frog family Sooglossidae. NPTS carries out research into the status of all these species, with a particular interest in Sooglossidae. Our interest in this group has led to the description of a new species Sooglossus pipilodryas, in addition to Sooglossus gardineri, Sooglossus sechellensis and Sooglossus (Nesomantis) thomasseti. We have collaborated on research into their acoustic biology, reproduction and evolution. Since 1997 we have been developing monitoring methods for these elusive frogs, results of this were published in 2007.
Current research on the Sooglossidae relates to status and adaptability to climate change, evolution, speciation, parental care in frogs and the evolution of terrestriality
NPTS is working to restore the exceptional chelonian fauna of the islands through protecting of turtle nesting beaches on Silhouette island, captive breeding and reintroduction of Seychelles terrapins and Seychelles giant tortoises. Seychelles is exceptional in supporting 9 species (including 5 endemic species and 2 endemic subspecies) in a small geographical area: two of the seven sea turtle species (green turtle Chelonia mydas and hawksbill turtle Eretmochelys imbricata), three terrapins (Pelusios subniger parietalis, Pelusios castanoides intergularis and the extinct Pelusios seychellensis) and four tortoises (Aldabra giant tortoise Dipsochelys dussumieri, Seychelles giant tortoise Dipsochelys hololissa, Arnold's tortoise Dipsochelys arnoldi and the extinct Daudin's tortoise Dipsochelys daudinii).
The 20 species of lizard include the geckos Phelsuma sundbergi, Phelsuma astriata, Phelsuma laticauda, Phelsuma abbotti, Urocotyledon inexpectata, Ailuronyx seychellensis, Ailuronyx trachygaster, Ailuronyx tachyscopaeus, Hemidactylus mercatorius, Hemidactylus frenatus, Hemidactylus brooki, Gehyra mutilata and Lepidodactylus lugubris, the skinks Trachylepis sechellensis, Trachylepis wrightii, Pamelascincus gardineri, Janetascincus braueri, Janetascincus veseyfitzgeraldi and Cryptoblepharus boutonii, and the girdled lizard Zonosaurus madagascariensis insulans. All these species are being monitored by NPTS and we are investigating their ecology and evolutionary relationships.
One of the most interesting of the Seychelles geckos is Ailuronxy trachygaster, the giant bronze gecko. This has been an enigma since 1851 when it was described from Madagascar. Despite much interest in this large (30cm), heavily built gecko no-one has been able to find living animals anywhere on Madagascar. It is related to two smaller species found in the Seychelles islands and for many years it was suspected that the 1851 specimen had originally come from Seychelles and had been incorrectly labelled. In the 1990s exceptionally large geckos were spotted in the Vallee de Mai on Praslin island and after much careful research were identified as the long-lost giant bronze gecko. It has since been found on Silhouette island as well and is estimated to number about 3,400 individuals. With this very restricted range it is Vulnerable to any further habitat deterioration or range contraction.
There is one species of chameleon Calumma tigris, focus of special research by NPTS. Although it is found on three islands its populations are at low density and just 2,000 individuals are thought to exist. As with most island species it is threatened by invasive plants which degrade the primary forests. These continue to spread at an ever increasing pace on many islands, accordingly it is considered to be Endangered. This species does not bury its eggs in soil but lays them in the axils of pineapple plants, an introduced species. Where it bred before the pineapples invaded remains a mystery. More and more island species are being forced into depending on introduced species as their natural associations are lost.
Three species of land snake are resident breeders: the introduced flowerpot snake Rhamphotyphlops braminus, and the two endemic species of house snake Lycodon geometricus and wolf snake Lycognathophis sechellensis. The sea-snake Pelamis platurus has been observed in Seychelles waters but is not resident. The status of the terrestrial species is being monitored, the endemic species are considered to be Endangered.