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Eleutherodactylus juanariveroi

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AMPHIBIA ANURA ELEUTHERODACTYLIDAE

Scientific Name: Eleutherodactylus juanariveroi
Species Authority: Rios-López & Thomas, 2007
Synonym(s):
Eleutherodactylus juanariveroi Rios-López and Thomas, 2007
Taxonomic Notes: Eleutherodactylus juanariveroi can be distinguished from similar species by a combination of morphometrics, body colouration, advertisement call features and habitat association (Rios-López and Thomas, 2007).

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A4ac; B1ab(i,ii,iii)+2ab(i,ii,iii) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Neftali Rios-López
Reviewer(s): Ariadne Angulo and Simon Stuart
Justification:
Listed as Critically Endangered because its Extent of Occurrence is less than 100 km2, its Area of Occupancy is less than 10 km2, all individuals are in a single location, and its distribution is restricted to one wetland system which is currently under threat of being lost due to urban development and contamination of water by nearby landfills.

Geographic Range [top]

Range Description: Eleutherodactylus juanariveroi is only known from the type locality: Sabana Seca, Toa Baja Municipality, in a seasonally flooded herbaceous wetland in the vicinity of the US Naval Security Group Activity Sabana Seca (USNSGASS) and the Caribbean Primate Research Center, Puerto Rico (18 26.127' N, 66 12.092' W, 10-20 m asl)(Rios-López and Thomas 2007).
Countries:
Native:
Puerto Rico (Puerto Rico (main island))
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species appears to be common in the type locality (Rios-López and Thomas 2007). Nonetheless, it is the less abundant species among sympatric Eleutherodactylus (E. brittoni, E. cochranae, E. coqui) (N. Ríos-López pers. comm. 2008).
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: The species inhabits the subtropical moist forest life zone. The type locality consists of a palustrine herbaceous wetland at 17 m asl. The wetland is seasonally flooded with fresh water; the soil consists of swamp and marsh organic deposits. Herbaceous vegetation in this habitat includes the toothed midsorus fern (Blechnum serrulatum), willdenow's maiden fern (Thelypteris interrupta), bulltongue arrowhead (Sagittaria lancifolia), flatsedges (Cyperus sp.), spike rushes (Eleocharis sp.), and vines and grasses. The habitat at the type locality occupies ca 180 ha; the species was not found in other wetland sites in the northern coastal plain. Individuals are active between 1900-2200 hours, while perching, sitting, or calling on herbaceous vegetation, between 0.4 m and 1.2 m above water level. Calling sites for males were found to be between 0.6 and 1.2 m above ground level. Egg clutches vary between 1-5 eggs and are mostly deposited on leaf axils of S. lancifolia. Embryos hatch after approximately 19 days (Rios-López and Thomas 2007; N. Rios-López pers. comm. 2008).

This species is thought to have year-round reproduction given the frequency of juveniles found in any given month. However, most adult activity (including calling males) is greater during the warm and wet months (May to November), and diminishes during the cooler and drier months (particularly between the end of January and end of March). It is expected that recruitment rates reflect this seasonal pattern with a greater amount of clutches being produced during the warm and wet months. The seasonal breeding pattern in this frog is similar to that of other species of the genus in Puerto Rico, such as E. antillensis, E. cochranae, E. coqui, E. cooki, E. gryllus and E. portoricensis. (N. Rios-López pers. comm. 2008).
Systems: Terrestrial

Threats [top]

Major Threat(s): The type locality of Eleutherodactylus juanariveroi has, in the past, experienced little disturbance partly due to restricted access of local people by the US Naval Security Group Activity Sabana Seca (USNSGASS) and the limited development of military installations in this wetland. However, it is now threatened by private and governmental housing, industrial, and recreational projects that are spreading rapidly through the region after the USNSGASS ceased operations in 2005 (Rios-López and Thomas 2007).

Conservation Actions [top]

Conservation Actions: Conservation measures are urgently needed to protect the only wetland system where the species is known to occur, and also the associated limestone hills to the south, which include two watersheds that drains freshwater into this wetland (N. Ríos-López pers. comm. 2008).

Other conservation measures may also include the restoration of wetlands with similar characteristics as those at the type locality, the implementation of ex-situ breeding projects (individuals of this species have been successfully bred in captivity with a relatively simple methodology, N. Ríos-López pers. comm. 2008) and reintroduction of the species (both captive bred and translocated individuals) into these restored wetlands (N. Ríos-López pers. comm. 2008).

Some conservation measures already in place include assigning the species a Critically Endangered (CR) status and the designation of its ecosystem and surroundings as Essential Critical Natural Habitats. This designation, issued by the Departamento de Recursos Naturales y Ambientales (DRNA) of Puerto Rico, provides a legal basis for the regulation and enforcement of the area's conservation. Although this is the first time the DRNA issues this kind of designation, it is being challenged at local courts by a landowner and by the municipal government of Toa Baja. In the meantime, there is still no management plan and no actions have been undertaken to create a Natural Reserve at this site, which limits the protection that this designation can afford (N. Ríos-López pers. comm. 2008).

Bibliography [top]

Carmona, J.L. 2007. Redevelopment of Sabana Seca in DNER's hands. Caribbean Business.

Departamento de Recursos Naturales y Ambientales, Estado Libre Asociado de Puerto Rico. 2007. Designación del coquí llanero Eleutherodactylus juanariveroi Ríos-López y Thomas como especie en peligro crítico de extinción.

Departamento de Recursos Naturales y Ambientales, Estado Libre Asociado de Puerto Rico. 2007. Designación del Hábitat Natural Crítico Esencial del Coquí Llanero Eleutherodactylus juanariveroi Ríos-López y Thomas Una nueva especie para Puerto Rico.

Rios-López, N., and Thomas, R. 2007. A new species of palustrine Eleutherodactylus (Anura: Leptodactylidae) from Puerto Rico. Zootaxa 1512: 51-64.

Rivera Santos, M. 2006. Desalojan 11 familias por contaminación. Available at: http://www.ceducapr.com/. (Accessed: November 29, 2006).

Rivera Santos, M. 2006. Pesquisa de la EPA en humedales. Available at: www.vocero.com/. (Accessed: July 4 2008).


Citation: Neftali Rios-López 2008. Eleutherodactylus juanariveroi. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 23 August 2014.
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