Wikipedia
Eleutherodactylus
Eleutherodactylus is a genus of frogs in the Eleutherodactylidae family.[1] Many of the 185 species of the genus are commonly known as "rain frogs" or "robber frogs", due to their sharp, high-pitched, insect-like calls.[2]
The best-known species is the Common Coquí (Eleutherodactylus coqui), which is both a national symbol of Puerto Rico and a notorious invasive species in Hawaii. Two Eleutherodactylus species, E. limbatus and E. iberia, belong to the smallest known frogs, measuring only 8½ mm in length.[3] and thus less than 1 mm more than Paedophryne amauensis (around 7.7 mm).[4]
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Etymology
The name "Eleutherodactylus" is derived from the Greek words for free-toed. Most species are small, slender, and cryptically colored, with 3–5 free toes. A few, such as the Web-footed Coquí (Eleutherodactylus karlschmidti) of Puerto Rico, do have completely webbed feet.
Distribution and habitat
Species of Eleutherodactylus are found throughout the Neotropics, including the southern United States, Mexico, Central America, and the Caribbean. Additionally, the Common Coquí (E. coqui) has been introduced to several islands in the Hawaiian archipelago, as well as elsewhere in the Pacific.[5]
They can be terrestrial, arboreal, or aquatic, typically living in forests or riparian areas, and feeding primarily upon arthropods. Many Eleutherodactylus species have highly restricted ranges and are found on only one island or in one or a few localities. Even some of these restricted species can occur at very high densities.
Reproduction and development
All species of Eleutherodactylus are characterized by direct development, in which eggs hatch directly into small frogs, completely bypassing the tadpole stage. This adaptation may be largely responsible for their ecological and evolutionary success. Most species of Eleutherodactylus are characterized by parental behaviors, such as egg-guarding by either the male or female parent. In some cases, even young froglets are attended by parents. Another extinct Puerto Rican species, the Golden coquí (Eleutherodactylus jasperi), gave birth to live young. Many species (for example, Cook's Robber Frog, (E. cooki)), also of Puerto Rico, exhibit sexual dimorphism in size and color.
Phylogenetics
The basis of forming this genus has been morphological, but sequence comparisons of protein-encoding DNA, mitochondrial DNA, and ribosomal RNA have shown that geographic range is a much more consistent predictor of cladistics for this group of frogs. The climbing habits of many species have evolved independently. All true members of the genus have been clustered into subgenera, but many less-related species require more genetic data before they are to be officially classified elsewhere. The theory that the Eleutherodactyline colonization of Central America and the Caribbean from their origins in South America occurred during the Cretaceous has fallen out of favor. The fossil record combined with molecular clock analyses indicate that the subgenera were probably founded by small groups of individuals by flotsam dispersal during the Eocene or Oligocene epochs. Land bridges would have been limited to facilitating dispersal between West Indian islands, however, the Oligocene division of Hispaniola and Cuba resulted in further speciation. The distribution of the subgenus Syrrhopus is most likely due to a secondary dispersal to Central America from the Greater Antilles during the Miocene. The formation of the Panama Isthmus during the Pliocene has caused some intercontinental distribution among the clades, although only twenty "South American frogs" have ever made it northwards after the original colonization.[6] Sensu stricto, however, it should exclude clades with distributions south of the Panama Canal.[6]
Species
West Indian (Subgenus Eleutherodactylus)
West Indian (Subgenus Euhyas)
Hispaniolan (subgenus Pelorius)
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North/Central American and Cuban (subgenus Syrrhopus)
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Central American clade (genus/subgenus Craugastor)
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Undefined clade
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References
- ^ Hedges, S. B., W. E. Duellman, and M. P. Heinicke . 2008. New World direct-developing frogs (Anura: Terrarana): molecular phylogeny, classification, biogeography, and conservation. Zootaxa 1737: 1-182.
- ^ "Amphibian Species of the World". http://research.amnh.org/vz/herpetology/amphibia/?action=references&id=8839. Retrieved 2011-11-23.
- ^ The Center for Reptile and Amphibian Research: Interesting Facts About Amphibians
- ^ Rittmeyer, E. N.; Allison, A.; Gründler, M. C.; Thompson, D. K.; Austin, C. C. (2012). Etges, William J.. ed. "Ecological Guild Evolution and the Discovery of the World's Smallest Vertebrate". PLoS ONE 7: e29797. doi:10.1371/journal.pone.0029797.
- ^ > "Eleutherodactylus coqui (amphibian) at the Global Invasive Species Database". http://www.issg.org/database/species/ecology.asp?si=105&fr=1&sts>. Retrieved 2007-06-06.
- ^ a b Heinicke, M.P., W.E. Duellman & S.B. Hedges (2007). "Major Caribbean and Central American frog faunas originated by ancient oceanic dispersal". Proc. Nat. Acad. Sci. 104 (24): 10092–7. doi:10.1073/pnas.0611051104. PMC 1891260. PMID 17548823. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1891260.
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Coquí
Coquí is the common name for several species of small frogs endemic to the island of Puerto Rico, onomatopoeically named for the loud sound males of two species make at night, the common coqui and the mountain coqui. The coquí is one of the most common frogs in the island of Puerto Rico. Many different species of small frogs create the family of the coquí.
More than 16 different species live in the island, 13 of which occur in the Caribbean National Forest. Other species of this genus can be found around the world: in Central and South America; and the Caribbean.
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Taxonomy
Coquís belong to the Eleutherodactylus genus which in Greek means free toes. Eleutherodactylus contains over 700 different species that occur in the southern United States, Central America, South America, and the Caribbean.
Seventeen described species of coquís inhabit Puerto Rico. In 2007 a new species, the Coquí Llanero, was officially named Eleutherodactylus juanariveroi.[1]
Role in the Ecosystem
The coqui has essentially become the species which controls the population of herbivorous insects.
Population Decline
The decline of the coqui population has increased since the introduction in some manner of the Batrachochytrium dendrobatidis [2]. This fungus has been extremely effective against amphibians because it can cause skin infection. The coquis found in El Yunque are resistant to the B. dendrobatidis fungus at the expense of their size, which reduces the aptitude to survive in the wilderness (Burrowes, Longo and Rodriguez 2007). It was also seen that individuals that carry this fungus are more susceptible to frequent places were the B. dendrobatidis fungus is concentrated. Although the fungus frequents humid environments a higher rate of infection was seen in drier climates because coquis tend to cluster in humid areas within this drier climate (Burrowes, Longo and Rodriguez 2007).
Geographic distribution
The current record from the USGS[3] establishes that it has been identified in: Puerto Rico, Hawaii, St. Croix, St. John and St. Thomas, U.S. Virgin Islands, Dominican Republic, Vieques, and Florida.
At one point Louisiana was identified as another location but according to the USGS the Louisiana record was erroneous and was based on two pet coquis, both males, kept in a greenhouse for 2–3 years until killed off by a winter freeze [5].
Coquis have become established in Hawaii, where they are considered an invasive species. Coqui population density in Hawaii can reach 20,000 animals per acre and affects 50,000 acres (20,000 ha). Eradication campaigns are underway on Hawaiʻi and Maui.[4][5][6] Some groups favor its adoption.[7]
Eradication techniques include hand capture and spraying with a 12% solution of citric acid along with a certification program for nurseries to prevent them from acting as centers of contagion.[4]
See also
- Common Coquí
- Fauna of Puerto Rico
- List of amphibians and reptiles of Puerto Rico
- Coqui Francolin, also onomatopoeically named
References
- ^ Rios-López, N. and R. Thomas. 2007. A new species of palustrine Eleutherodactylus (Anura: Leptodactylidae) from Puerto Rico. Zootaxa 1512: 51–64
- ^ Burrowes, Patricia A. and Ana V. Longo. Persistence with Chytridiomycosis Does Not Assure Survival of Direct-developing Frogs. EcoHealth June 2010: p.185-195. ProQuest. Web. 5 June 2011.
- ^ [1]
- ^ a b Shafer, Jacob (November 18, 2010). "On the Front Lines of the Coqui Battle With Maui Invasive Species Committee". http://www.mauitime.com/Articles-i-2010-11-18-75172.113117-On-the-Front-Lines-of-the-Coqui-Battle-With-Maui-Invasive-Species-Committee.html. Retrieved November, 2010.
- ^ [2]
- ^ [3]
- ^ [4]
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