Pedra Branca Skink
| Pedra Branca Cool-skink or Pedra Branca Skink | |
|---|---|
| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Family: | Scincidae |
| Genus: | Niveoscincus |
| Species: | N. palfreymani |
| Binomial name | |
| Niveoscincus palfreymani (Rawlinson, 1974) | |
| Synonyms | |
|
Pseudemoia palfreymani | |
The Pedra Branca Cool-skink, Pedra Branca Skink, or Red-throated Skink (Niveoscincus palfreymani) is a species of skink in the Scincidae family. It is endemic to Australia, and is restricted to the windswept Pedra Branca, an island off southern Tasmania of only 2.5 ha, where it is dependent on the seabird colonies.[1] [2] [3] It is the only lizard species found on the island.[4]
Description
Adults have a head and body length of 6-10 cm. Adults weigh about 14 grams, while pregnant females can weigh up to 22 grams. Adults are a glossy charcoal colour while juveniles are more lightly coloured.[4]
Biology
The Pedra Branca skinks feed on small invertebrates such as insects, spiders and isopods. They have also been observed to feed on fish scraps dropped or regurgitated by the seabirds on the island as well as seabird eggs. However, these foods are only available to the skinks on a seasonal basis.[3]
There are six separate colonies of skinks on the island with a total population that fluctuates between 250 and 600 lizards, depending on food availability. The skinks are preyed upon by Silver Gulls. The movement of Silver Gull colonies into areas where the skinks are living has recently lead to the decline of some skink colonies.[3]
The skinks live in crevices in the rocks, which provide protection from wind, salt spray and waves. Adult skinks defend their burrows against intrusion by other skinks. However, they are only active when air temperatures are above 15 deg C.[3]
Pedra Branca skinks are a long-lived species. They do not mature until they are about 6-8 years of age. They can live at least ten years, possibly up to 15 years.[3]
Like most endemic Tasmanian skinks, the Pedra Branca skink bears live young.[3]
Status
This species is considered to be vulnerable[2] due to the restricted range and multiple threats including seabird predation, fluctuations in the food supply, climate change and the threat of invasion by introduced predators such as rats.
References
- ↑ Australasian Reptile & Amphibian Specialist Group 1996.Niveoscincus palfreymani
- ↑ 2.0 2.1 2006 IUCN Red List of Threatened Species Downloaded on 20 July 2007
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 TPWS: Wildlife of Tasmania - Pedra Branca Skink
- ↑ 4.0 4.1 "Pedra Branca Skink". Parks and Wildlife Service Tasmania. Retrieved 4 February 2014.
External links
- http://www.parks.tas.gov.au/indeX.aspX?base=5400 photo of Pedra Branca skink