Desert rain frog

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Desert rain frog
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Anura
Family: Brevicipitidae
Genus: Breviceps
Species:
B. macrops
Binomial name
Breviceps macrops
Boulenger, 1907
Breviceps macrops map-fr.svg

The desert rain frog, web-footed rain frog, or Boulenger's short-headed frog (Breviceps macrops) is a species of frog in the family Brevicipitidae. It is found in Namibia and South Africa. [1] [2] [3] Its natural habitat is the narrow strip of sandy shores between the sea and the sand dunes. [4] This area is characteristic of loose sand and continuous strong winds, with approximately 60mm of annual precipitation and no surface water. [5] It is threatened by habitat loss by such factors as mining and tourism. [4]

Contents

Description

The desert rain frog is a plump species with bulging eyes, a short snout, short limbs, spade-like feet, and webbed toes. On the underside, it has a transparent area of skin through which its internal organs can be seen. It can be between 4 and 6 centimetres (1.6 and 2.4 in) long. Its color is yellowish-brown, and sand often adheres to its skin. [3] Sand sticks to the frogs entire body excluding the mouth and nose and can likely be attributed to a type of sticky secretion as removal of sand from the frog is difficult. [6]

Unlike most other species of frogs, it develops directly from the egg into adults without passing through the tadpole stage. It has a stout body, with small legs, which makes it unable to hop or leap – instead, it walks around on the sand. Unusually for a frog, it does not require water in its habitat to survive. It however also does not have any apparent adaption specifically to prevent water loss. [7] Its eyes are comparatively large and bulging. The lifespan ranges between 4 and 14 years.

Habitat

The desert rain frog is mostly found on a small strip of land about 10 kilometres (6.2 mi) wide along the coast of Namibia and South Africa below the Congo basin. [8] The small area of sand dunes often gets a lot of fog, which supplies moisture in an otherwise arid and dry region. Small amounts of rainfall occur in the regions winter months of June and July. [9]

The habitat of desert rain frogs is limited to a narrow strip of land along the western coast of southern Africa, specifically in South Africa and Namibia. This area is characterized by sandy shores and sand dunes, and it is one of the few places in the world where these frogs can be found. The climate in this region is dry and arid, with very little rainfall, and the frogs are adapted to living in these conditions. They are able to survive in areas with very little water by burrowing underground and waiting out dry periods, and they are also able to absorb water through their skin. The desert rain frog's habitat is characterized by xerophytic vegetation, which is adapted to living in dry environments, and in the spring, the area blooms with a variety of flowering plants. Fog is also an important part of the desert rain frog's habitat, as it provides some moisture in an otherwise dry region. [10]

Reproduction

During the breeding season, which occurs between June and October, male desert rain frogs emerge from their burrows at night and call out to females using a distinctive squeaking sound. When a female hears a male's call and is interested in mating, she will approach him and the two will mate underground. After mating, the female will lay a clutch of eggs, which can range in size from 12 to 40 eggs. Desert rain frogs are terrestrial breeders meaning that the eggs develop in a burrow and one of the adult frogs remains in the area of the nest. [4] The eggs hatch into froglets, which do not go through a free-living tadpole stage like many other frog species. Instead, the froglets emerge fully formed from the eggs and are able to move and hunt for insects on their own. [11]

Behavior

The desert rain frog is nocturnal, spending the day in a burrow which is dug to a depth of 10 to 20 centimetres (3.9 to 7.9 in) where the sand is moist. It emerges on both foggy and clear nights and wanders about over the surface of the dunes. Its footprints are distinctive and are often found around patches of dung where it is presumed to feed on moths, beetles, and insect larvae. It is also known to eat beetles and ants. [6] It digs its way into the sand in the morning and its presence in a locality can be deduced from the little pile of loose sand dislodged by its burrowing activities. [12] Breeding is by direct development of eggs laid in its burrow, there is no aquatic tadpole stage. It produces a high-pitched squeaking sound when threatened. The male's croaking is also distinctly high-pitched.

They are docile when being interacted with by researchers and due to overlap of movement between individuals it is suggested that they are territorial with individuals of the same species. [13]

Status

The frog's total habitat range is smaller than 2,000 square kilometres (770 sq mi) and is fragmented. The number of individual frogs was previously decreasing but it is now unknown whether the population is decreasing or not. [1] It is threatened by habitat loss caused by opencast diamond mining and road construction, as well as increased human settlement. Fortunately, opencast diamond mining has recently ceased in south Africa. Attempts to restore the frogs' habitat by mining companies could mean that the frog is no longer threatened. However, no evidence has indicated that the frogs have actually recolonized their restored habitat. [1]

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References

  1. 1 2 3 4 IUCN SSC Amphibian Specialist Group.; South African Frog Re-assessment Group; et al. (SA-FRoG) (2017). "Breviceps macrops". IUCN Red List of Threatened Species . 2017: e.T3070A2794989. doi: 10.2305/IUCN.UK.2017-2.RLTS.T3070A2794989.en . Retrieved 16 November 2021.
  2. ↑ Frost, Darrel R. (2019). "Breviceps macrops Boulenger, 1907". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 9 March 2019.
  3. 1 2 Castillo, Nery (2011-06-23). "Breviceps macrops". AmphibiaWeb. Retrieved 2012-10-20.
  4. 1 2 3 Channing, Alan; Wahlberg, Kirsty (October 2011). "Distribution and conservation status of the desert rain frogBreviceps macrops". African Journal of Herpetology. 60 (2): 101–112. doi:10.1080/21564574.2011.608383. ISSN   2156-4574. S2CID   84377960.
  5. ↑ Carruthers, V. C.; Passmore, N. I. (June 1978). "A Note on Breviceps macrops Boulenger". The Journal of the Herpetological Association of Africa. 18 (1): 13–15. doi:10.1080/04416651.1978.9650950. ISSN   0441-6651.
  6. 1 2 Channing, Alan; Van Wyk, Andre; Baard, E. H.W.; Haagner, G. V.; Carpenter, G.; Haagner, G. V.; Els, R. A.; Haagner, G. V.; Haagner, G. V.; Branch, W. R.; Porter, B. W.; Patterson, M.; Haagner, Gerald (November 1987). "Life History Notes". The Journal of the Herpetological Association of Africa. 33 (1): 33–38. doi:10.1080/04416651.1987.9650177. ISSN   0441-6651.
  7. ↑ Channing, Alan; Van Wyk, Andre; Baard, E. H.W.; Haagner, G. V.; Carpenter, G.; Haagner, G. V.; Els, R. A.; Haagner, G. V.; Haagner, G. V.; Branch, W. R.; Porter, B. W.; Patterson, M.; Haagner, Gerald (November 1987). "Life History Notes". The Journal of the Herpetological Association of Africa. 33 (1): 33–38. doi:10.1080/04416651.1987.9650177. ISSN   0441-6651.
  8. ↑ Nielsen, Stuart V.; Daniels, Savel R.; Conradie, Werner; Heinicke, Matthew P.; Noonan, Brice P. (September 2018). "Multilocus phylogenetics in a widespread African anuran lineage (Brevicipitidae: Breviceps ) reveals patterns of diversity reflecting geoclimatic change". Journal of Biogeography. 45 (9): 2067–2079. doi:10.1111/jbi.13394. hdl: 2027.42/145569 . ISSN   0305-0270.
  9. ↑ Channing, A. (March 1988). "Opportunistic Sesonal Breeding by Frogs in Namaqualand". The Journal of the Herpetological Association of Africa. 35 (1): 19–24. doi:10.1080/04416651.1988.9650203. ISSN   0441-6651.
  10. ↑ "Desert Rain Frog". A–Z Animals.
  11. ↑ "Frog of the Week: Desert Rain Frog (Breviceps macrops)". Gone Froggin. 23 February 2016.
  12. ↑ Carruthers, V. C. & Passmore, N. I. (1978). "A note on Breviceps macrops Boulenger". Journal of the Herpetological Association of Africa . 18 (1): 13–15. doi:10.1080/04416651.1978.9650950.
  13. ↑ Channing, Alan (October 5, 2010). "Threatened amphibians in the Succulent Karoo Hotspot: An integrated approach to their conservation" (PDF).
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