Corsican painted frog (Discoglossus montalentii)

Description

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Corsican painted frog fact file

• Description
• Biology
• Range
• Habitat
• Status
• Threats
• Conservation
• Find out more
• Glossary
• References
• Print factsheet

Corsican painted frog description

The Corsican painted frog (Discoglossus montalentii) has a slender body with an acutely rounded snout. Like other painted frog species, the Corsican painted frog has a disc-shaped tongue and round or triangular pupils ^{(4) (5)}. The fingers of this species are short and unwebbed, whereas the toes are long ⁽⁴⁾. The tip of the fourth finger is wider than the base ⁽³⁾.

The skin of the Corsican painted frog is smooth and shiny with a scattering of small warts ⁽⁵⁾. There are two colour pattern varieties of this species. One variety is uniformly plain coloured, either dark brown, dark grey, reddish or red-brown, while the other has dark brown spots ^{(3) (6)}. The belly of the Corsican painted frog is yellowish-white ⁽³⁾. During the breeding season, the male Corsican painted frog has large nuptial pads on the fingers, chin and belly, which are swollen areas that help the male to grip onto the female during amplexus ⁽⁴⁾.

The tadpoles of the Corsican painted frog have tails which are longer than the body and are rounded at the tip. The upperparts of the tadpoles are blackish or dark brown, while the underparts and the muscular section of the tail are usually darkly pigmented ⁽⁷⁾.

The male Corsican painted frog has a call that has been described as a quiet, rolling laugh ⁽⁴⁾. The call of this species is more musical than in other frog species ⁽³⁾, described as a harmonious ⁽⁵⁾ ‘poop…poop…poop’ ⁽³⁾. It is thought that this distinctive call evolved as an adaptation to living in the same area as the closely related Tyrrhenian painted frog (Discoglossus sardus). The evolution of such different calls, or ‘acoustic partitioning’, ensures that the two species do not interbreed by only attracting mates of their own kind ⁽⁵⁾.

Synonyms

Discoglossus montalenti.

Size

Length: 4.5 - 6.5 cm ^{(2) (3)}

Corsican painted frog biology

The Corsican painted frog is generally a nocturnal species, although it is also known to be active during the day ⁽⁴⁾. This species frequently sits in shallow water with its head just above the surface, but the Corsican painted frog is very agile when it needs to be, often leaping between boulders in watercourses ⁽³⁾.

Breeding takes place in shallow water, with the male Corsican painted frog grasping the female around the waist during amplexus. Fertilisation is external, after which the female will lay between 500 and 1,000 eggs in slow-moving streams ⁽⁴⁾, generally under rocks and stones ⁽¹⁾. The tadpoles of the Corsican painted frog develop in these streams for three to eight weeks before undergoing metamorphosis ⁽⁴⁾.

The Corsican painted frog appears to have a mixed feeding strategy, and generally feeds on a variety of very small terrestrial and freshwater invertebrates. Aquatic invertebrates are usually captured from the surface or in shallow water ⁽²⁾, as the disc-shaped tongue is relatively short and cannot be flicked out of the mouth to catch flying insects ⁽⁵⁾.

Corsican painted frog range

The Corsican painted frog is one of just three amphibian species endemic to the island of Corsica, France ⁽²⁾. It is mainly found in the central part of the island, from Corte and Cervione in the north, down to Porto-Vecchio in the south ^{(1) (6) (8)}.

Corsican painted frog habitat

The Corsican painted frog is a mountain-dwelling species ⁽²⁾, which strongly favours areas in high-altitude pristine woods and forests with running waters ^{(1) (2) (3)}. It is particularly associated with the edge of rocky, precipitous streams ^{(1) (4) (8)}.

The Corsican painted frog has been recorded at elevations of between 300 and 1,900 metres above sea level, and it is not found in coastal lowlands ^{(1) (3) (8)}.

Corsican painted frog status

The Corsican painted frog is classified as Near Threatened (NT) on the IUCN Red List ⁽¹⁾.

Corsican painted frog threats

The exact status of the Corsican painted frog is not known ⁽⁶⁾, but it is thought that predation by introduced species is causing a slow decline in population numbers ⁽¹⁾.

Corsican painted frog conservation

The Corsican painted frog is listed on Appendix II of the Bern Convention, which aims to conserve the wild flora and fauna of the European Continent ⁽⁹⁾. This species is also on Annexes II and IV of the EU Habitats Directive, which means that it is in need of strict protection and requires the designation of special areas of conservation to ensure its future survival ⁽¹⁰⁾.

Other measures proposed for the conservation of the Corsican painted frog include further research into assessing its range and population size, as well as the status of its habitat. Identifying, establishing and maintaining new protected areas within suitable habitat would also be beneficial to this species ⁽⁶⁾.

Find out more

Learn more about amphibians:

• IUCN/SSC Amphibian Specialist Group:
  http://www.amphibians.org/
• AmphibianArk:
  http://www.amphibianark.org/
• Gascon, C., Collins, J.P., Moore, R.D., Church, D.R., McKay, J.E. and Mendelson III, J.R. (2005) Amphibian Conservation Action Plan. The World Conservation Union (IUCN), Gland, Switzerland. Available at:
  http://www.amphibianark.org/pdf/ACAP.pdf

Find out more about the habitat of this species:

• ARKive - Mediterranean Basin:
  http://www.arkive.org/eco-regions/mediterranean-basin/

Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

Glossary

Amplexus

The mating position of frogs and toads, in which the male clasps the female around the back or waist.

Endemic

A species or taxonomic group that is only found in one particular country or geographic area.

Fertilisation

The fusion of gametes (male and female reproductive cells) to produce an embryo, which grows into a new individual.

Invertebrates

Animals with no backbone, such as insects, crustaceans, worms, molluscs, spiders, cnidarians (jellyfish, corals, sea anemones) and echinoderms.

Metamorphosis

An abrupt physical change from the larval to the adult form.

Nocturnal

Active at night.

References

1. IUCN Red List (October, 2011)
   http://www.iucnredlist.org/
2. Salvidio, S., Sindaco, R. and Emanueli, L. (1999) Feeding habits of sympatric Discoglossus montalentii, Discoglossus sardus and Euproctus montanus during the breeding season. Herpetological Journal, 9: 163-167.
3. Arnold, E.N. (2002) A Field Guide to the Reptiles and Amphibians of Britain and Europe. HarperCollins Publishers Ltd., London.
4. Halliday, T. and Adler, K. (2002) The New Encyclopedia of Reptiles and Amphibians. Oxford University Press, Oxford.
5. EDGE of Existence - Corsican painted frog (October, 2011)
   http://www.edgeofexistence.org/amphibians/species_info.php?id=1376
6. AmphibiaWeb - Discoglossus montelentii (October, 2011)
   http://amphibiaweb.org/cgi-bin/amphib_query?query_src=aw_search_index&table=amphib&special=one_record&where-genus=Discoglossus&where-species=montalentii
7. Salvidio, S., Sindaco, R., Emanueli, L. and Lanza, B. (1999) The tadpole of the endemic Corsican painted frog Discoglossus montelentii (Anura, Discoglossidae). Italian Journal of Zoology, 66(1): 63-69.
8. Stuart, S.N., Hoffmann, M., Chanson, J.S., Cox, N.A., Berridge, R.J., Ramani, P. and Young, B.E. (Eds.) (2008) Threatened Amphibians of the World. Lynx Edicions, Barcelona, Spain.
9. Council of Europe: Bern Convention (October, 2011)
   http://conventions.coe.int/Treaty/EN/Treaties/Html/104.htm
10. EU Habitats Directive (October, 2011)
    http://www.jncc.gov.uk/page-1374