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The barred wedge-snout ctenotus (Ctenotus schomburgkii) is a species of skink found in Australia.[2]
Description:
A small skink (up to 5cm long), it has distinguishing orange dots along its side and brown and orange stripes on its back.[2]
Distribution:
This species is found in central western New South Wales and Queensland, to South Australia and the southern half of the Northern Territory through to the southern half of Western Australia.[3]
Ecology:
Ctenotus Schomburgkii is an ectotherm. That is, they rely on external heat source from the environment to get what heat they require for their body temperature. They use solar radiation or conduction for their bodies heat source. (Sitting in the sun or deriving heat from a warmed rock for example).[4]
The are very adaptive skinks and relatively unspecialised in dietary requirements so can use various habitats. [5]
C. Schomburgkii occurs in sympatry with other ctenotus lizards,[5,6] all of whom use spinifex grasses under trees. Being so adaptive they have minimal competition from inter or intra specific species.[5]
Spinifex (triodea and plectrachen) is of major importance to C. schomburgkii [6] Termite tunnels have been found in the centre of spinnifex grass tussocks, linking to mounds nearby, so the grasses are excellent for termite eating lizards. In fact flourishing termite populations has been linked to high lizard population directly[7]
Behaviour
C. Schomburgkii has bimodal daily patterns, being active during the day, specifically at the start and end of the day. It forages widely. It has a longer activity time than larger lizards of the same genus.[6]
C. Schomburgkii lives over 5 yrs, females live longer than males and are also larger.[5]
Breeding is over summer (Oct -Feb), they mostly lay clutches of 2 eggs but in some cases 1-3 eggs.[5]
C. Schomburgkii has a home range of 40 - 60 metres. [5]
Diet:
This skink feeds mainly on termites but is considered a generalist insectivore. [5,6]They also are known to eat spiders, crickets, grasshoppers and beetles.[5]
Predators
Varanus gouldi otherwise known as the Sand Goanna, is a large monitor that preys on and digs schomburgkii out of burrows in the sand.
When C. Schomburgkii hides in spinifex tussocks, mammalian and avian predators cannot catch them. These are therefore not considered predators[6] C. Schomburgkii is however payed upon by cats.[8]
Conservation
While ctenotus schomburgkii is listed as least concern, [8] when habitat is fragmented into corridors or patches of habitat the lizard population is affected. Less are found the further one moves away from distinct conservation areas. Direct corridors are not necessarily protective of this and other species. [9]
Climate change is a risk to these species as fecundity is directly affected by temperature. This is more true for ctenosus lizrads than mammals and endotherms. Favoured vegetation growth (rainfall) is also a factor as the spinnifex grasses are used for both food and shelter.[10]
2. Museums Field Guide apps species profiles – vertebrates Accessed through ala.org.au June 2023.
3. https://www.iucnredlist.org/species/109464571/109464580#geographic-range
4. https://biologydictionary.net/ectotherm/
5.Read, J.L. 1998. The ecology of sympatric scincid lizards (Ctenotus) in arid South Australia . Australian Journal of Zoology 46: 617-629.
6.Pianka, E. R. 1969. Sympatry of dessert lizards (ctenotus) in Western Australia. Ecology 50,(6):1012 - 1030
7.Morton, S.R. & James, C. D. 1988 The Diversity and Abundance of Lizards in Arid Australia: A New Hypothesis. The American Naturalist. Vol. 132(2), 237-256.
8. IUCN 2016. The IUCN Red List of Threatened Species. Version 2022-3. http://www.iucnredlist.org.
9. Williams, J.R., Driscoll, D.A. and Bull, C.M. 2012. Roadside connectivity does not increase reptile abundance or richness in a fragmented mallee landscape. Austral Ecology 37: 383-391.
10. Read, J.L., Kovac, K., Brook, B.W. and Fordham, D.A. 2012. Booming during a bust: Asynchronous population responses of arid zone lizards to climatic variables. Acta Oecologica 40: 51-61.
Image: Gavin Goodyear 2015. Some rights reserved (CC-BY-NC)
The barred wedge-snout ctenotus (Ctenotus schomburgkii) is a species of skink found in Australia.
Description:
Cnetonus Schomburgkii A small skink (up to 5cm long), it has distinguishing orange dots along its side and brown and orange stripes on its back.[2]
Distribution:
This species is found in central western New South Wales and Queensland, to South Australia and the southern half of the Northern Territory through to the southern half of Western Australia.[3]
Ecology:
Ctenotus Schomburgkii is an ectotherm. That is, they rely on external heat source from the environment to get what heat they require for their body temperature. They use solar radiation or conduction for their bodies heat source. (Sitting in the sun or deriving heat from a warmed rock for example).[4]
The are very adaptive skinks and relatively unspecialised in dietary requirements so can use various habitats. [5]
C. Schomburgkii occurs in sympatry with other ctenotus lizards,[5,6] all of whom use spinifex grasses under trees. Being so adaptive they have minimal competition from inter or intra specific species.[5]
Spinifex (triodea and plectrachen) is of major importance to C. schomburgkii [6] Termite tunnels have been found in the centre of spinnifex grass tussocks, linking to mounds nearby, so the grasses are excellent for termite eating lizards. In fact flourishing termite populations has been linked to high lizard population directly[7]
Behaviour
C. Schomburgkii has bimodal daily patterns, being active during the day, specifically at the start and end of the day. It forages widely. It has a longer activity time than larger lizards of the same genus.[6]
C. Schomburgkii lives over 5 yrs, females live longer than males and are also larger.[5]
Breeding is over summer (Oct -Feb), they mostly lay clutches of 2 eggs but in some cases 1-3 eggs.[5]
C. Schomburgkii has a home range of 40 - 60 metres. [5]
Diet:
This skink feeds mainly on termites but is considered a generalist insectivore. [5,6]They also are known to eat spiders, crickets, grasshoppers and beetles.[5]
Predators
Varanus gouldi otherwise known as the Sand Goanna, is a large monitor that preys on and digs schomburgkii out of burrows in the sand.
When C. Schomburgkii hides in spinifex tussocks, mammalian and avian predators cannot catch them. These are therefore not considered predators[6] C. Schomburgkii is however payed upon by cats.[8]
Conservation
While ctenotus schomburgkii is listed as least concern, [8] when habitat is fragmented into corridors or patches of habitat the lizard population is affected. Less are found the further one moves away from distinct conservation areas. Direct corridors are not necessarily protective of this and other species. [9]
Climate change is a risk to these species as fecundity is directly affected by temperature. This is more true for ctenosus lizrads than mammals and endotherms. Favoured vegetation growth (rainfall) is also a factor as the spinnifex grasses are used for both food and shelter.[10]
