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Litoria raniformis 

Scope: Global
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Hylidae

Scientific Name: Litoria raniformis
Species Authority: (Keferstein, 1867)
Common Name(s):
English Green and Gold Frog, Growling Grass Frog, Southern Bell Frog, Warty Bell Frog
Taxonomic Source(s): Frost, D.R. 2014. Amphibian Species of the World: an Online Reference. Version 6 (27 January 2014). New York, USA. Available at: http://research.amnh.org/herpetology/amphibia/index.html. (Accessed: 27 January 2014).

Assessment Information [top]

Red List Category & Criteria: Endangered A2ae ver 3.1
Year Published: 2016
Date Assessed: 2004-04-30
Annotations:
Needs updating
Assessor(s): Hero, J., Gillespie, G., Lemckert, F., Littlejohn, M., Robertson, P., Brereton, R. & Brown, P.
Reviewer(s): Stuart, S.N., Chanson, J.S. & Cox, N.A.
Justification:
Listed as Endangered because of a drastic population decline estimated to be more than 50% over the last ten years, in part due to chytridiomycosis.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species was formerly distributed across a large area of south-east Australia, including Tasmania, from zero to 1,300 m asl (Osborne et al. 1996). In New South Wales and the Australia Capital Territory its range was centred on the Murray and Murrumbidgee River valleys and their tributaries. It occurred throughout the Southern Tablelands and was also recorded on the Central Tablelands as far north as Bathurst (Ehmann and White 1997). It was widespread across Victoria, absent only from the west desert regions and the east alpine regions (Littlejohn 1963, 1982; Hero et al. 1991). In South Australia the species is known to occur along the lower Murray River valley, the lower south-east to near Keith, and a small introduced population, in the Adelaide Hills (Tyler 1978). In Tasmania, the species occurred broadly across the north and east of the island and on the Bass Strait Island (Brook 1979), and in pockets in the south of the state. This species has also been introduced to New Zealand, where it is widespread across North and South Islands and on Great Barrier and Stewart Islands.
Countries occurrence:
Native:
Australia
Introduced:
New Zealand
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It was once a common species, but serious declines have occurred in sections of the range (Mahony 1999). Ehmann and White (1997) noted that in New South Wales the species had disappeared from sites in the central and southern highlands. It is currently widespread throughout the Murray River valley but has disappeared from a number of sites along the Murrumbidgee River (Mahony 1999) and there are no recent records from the Monaro District near the Victorian border (G. Gillespie pers. comm.). It persists in isolated populations in the greater Melbourne area, and isolated populations are known from a few sites in central Victoria and Gippsland. A similar decline has been noted in Tasmania, and it is now almost absent from the midlands of Tasmania. In New Zealand, where the species is introduced, there are many thousands, although local declines due to chytridiomycosis and/or introduced Gambusia fish have been observed.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is usually found in association with dams, ponds and marshes, either amongst sedges and other semi-aquatic vegetation, or sheltering under logs and rocks up to 1,300 m asl (Gillespie et al. 1995). It appears to be associated with permanent waterbodies though it is unclear whether, like Litoria aurea, the species also utilizes ephemeral pools (Mahony 1999). It occurs both in woodland and areas of improved pasture (Gillespie et al. 1995). Little is known about the biology of this species; however, it is likely to be similar to that of L. aurea (Gillespie et al. 1995). Males call from August to April (Hero et al. 1991). The species breeds in permanent ponds or swamps, usually with extensive areas of sedges and rushes from which adults call (Gillespie et al. 1995). About 1,700 eggs are laid in a loose clump (Hero et al. 1991, Hero and Warrell unpubl.). The larvae are free swimming and develop over summer and autumn (Gillespie et al. 1995). Metamorphosis takes place between late summer and autumn, although larvae may overwinter and metamorphose the following season (Gillespie et al. 1995).
Systems:Terrestrial; Freshwater

Use and Trade [top]

Use and Trade: This species is mainly collected as a byproduct of another farming industry.

Threats [top]

Major Threat(s): The cause(s) of the apparent declines observed in populations of all taxa within the L. aurea complex are unclear (Gillespie et al. 1995). Investigations of disappearances among the group have primarily focused on L. aurea and L. castanea and two major directions in research have been pursued: the role of increased ultraviolet radiation; and the impact of the introduced fish, Gambusia (Mahony 1999). As for L. aurea, L. raniformis has disappeared from sites where Gambusia is present (Mahony 1999, W. Osborne pers. comm.). The dates of introduction of Gambusia to many regions are not well documented and this lack of information has hampered research into declines (Mahony 1999). Introduced Gambusia fish are also a threat to the introduced populations in New Zealand. It is also possible that disease, such as a viral infection or chytrid fungus, may have contributed to the decline of some species (W. Osborne pers. comm.). Chytrid fungus was detected in this species in Mount Compass, South Australia, but was first identified in New Zealand from populations of this species in Christchurch. The drainage of wetlands in Tasmania is a particular threat.

Conservation Actions [top]

Conservation Actions: This species is protected by state legislation. As an introduced species in New Zealand it has the potential to spread chytrid to areas inhabited by native frogs. Its range includes several protected areas. In Tasmanian legislation the species is listed as "Vulnerable". Werribee Open Range Zoo is supporting ongoing field monitoring of a naturally occurring population, in conjunction with the Victorian Department of Sustainability and Environment. Melbourne Zoo also maintains a breeding population in captivity.

Citation: Hero, J., Gillespie, G., Lemckert, F., Littlejohn, M., Robertson, P., Brereton, R. & Brown, P. 2016. Litoria raniformis. The IUCN Red List of Threatened Species 2016: e.T12152A86177064. . Downloaded on 29 September 2016.
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