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Assessment Results

© 2011 Devin Edmonds (1 of 10 )

AmphibiaWeb species account

IUCN Red List assessment

Conservation Needs Assessment

Gephyromantis corvus   
Assessed for:  Madagascar   on: 24 Jul 2015   by: Angelica Crottini  
Assessment Status: Completed  
Order:   Anura     Family:   Mantellidae

IUCN Global Red List:   Endangered (EN)   
IUCN National Red List:   (not assessed)   
Distribution:     Madagascar  
Evolutionary Distinctiveness score:   23.82865132 
Recommended Conservation Actions:   In Situ Conservation  , In Situ Research  , Ex Situ Research  , Conservation Education   
Additional Comments:   This species appears to be restricted ONLY to Isalo. However, the species seems to be abundant there and not suffering from habitat alteration. CATEGORISATION CHANGED FROM LC to ENDANGERED. G. corvus has tadpoles that exhibit carnivory and emit click vocalisations. Especially the latter feature appears to be unique to this species (or shared by a few species). Still a matter of debate. 

Question #Short NameQuestion TextResponseComments
1 Extinction risk Current IUCN Red List category. [Data obtained from the IUCN Red List.] Endangered (EN) yes, the species was LC but is now listed as EN as it seems to be restricted ONLY to Isalo. A population of G. sp. aff. corvus from Makay is known but no genetic data are currently available.
2 Possibly extinct Is there a strong possibility that this species might be extinct in the wild? No / unlikely
3 Phylogenetic significance The taxon’s Evolutionary Distinctiveness (ED) score, as generated by the ZSL EDGE program. (These data are not editable by Assessors). ED value < 20
4 Protected habitat Is a population of at least 50% of the individuals of the taxon included within a reliably protected area or areas? Yes / probably This species is occurring at Isalo National Park where it is locally abundant. The natuarl habitat of the species is providing natural protection to the species.
5 Habitat for reintroduction Does enough suitable habitat exist, either within or outside of currently protected areas that is suitable for potential reintroduction or translocation? Yes / probably This species seems to inhabit shallow (younger) canyons in Isalo National park. All shallow canyons of this sandstone massif are potentially suitable for reintroduction
6 Previous reintroductions Have reintroduction or translocation attempts been made in the past for this species? No
7 Threat mitigation Are the threats facing the taxon, including any new and emerging threats not considered in the IUCN Red List, potentially reversible? Threats are likely to be reversible in time frame to prevent further decline / extinction
8 Over-collection from the wild Is the taxon suffering from unsustainable collection within its natural range, either for food, for the pet trade or for any other reason, which threatens the species’ continued persistence in the wild? No / unlikely
9 Population recovery Is the known population of this species in the wild large enough to recover naturally, without ex situ intervention if threats are mitigated? Yes / probably Where the species is present (shallow canyon) it seems to be quite abundant
10 Biological distinctiveness Does the taxon exhibit, for example, a distinctive reproductive mode, behaviour, aspect of morphology or physiology, within the Order to which it belongs (e.g. Anura, Passeriformes etc.)? Aspect of biology shared with < 6 other species This is a rock-dwelling (rupiculous) species adapted to inhabit the canyons of this sandstone massif. Tadpoles of this taxon are known to produce "click" sounds being a unique characteristic for Madagascar. This habit is know from a few other neotropical frog species.
11 Cultural/socio-economic importance Does the taxon have a special human cultural value (e.g. as a national or regional symbol, in a historic context, featuring in traditional stories) or economic value (e.g. food, traditional medicine, tourism) within its natural range or in a wider global context? No
12 Scientific importance Is the species vital to current or planned research other than species-specific ecology/biology/conservation? (e.g. human medicine, climate change, environmental pollutants and conservation science), within the Order to which it belongs (e.g. Anura, Passeriformes etc.)? No research dependent on this species
13 Ex situ research Does conserving this species (or closely related species) in situ depend upon research that can be most easily carried out ex situ? No The natural habitat of this species is providing natural protection to this taxon. However, it is possible that reproducing the reproductive needs for this (and all other Phylacomantis species) ex-situ might be quite difficult.
14 Husbandry analog Do the biological and ecological attributes of this species make it suitable for developing husbandry regimes for more threatened related species? i.e. could this species be used in captivity to help to develop husbandry and breeding protocols which could be used for a similar, but more endangered species at a later stage? Yes In comparaison to the other arid adapted Phylacomentis species, G. corvus is the more abundant, therefore it might be the best candidate if there will be need to develop an ex-situ strategy for the other arid adapted Phylacomentis.
15 Captive breeding Has this species been successfully bred and/or maintained in captivity? Not held in captivity to date
16 Educational potential Is the species especially diurnal/active/colourful and therefore suited to be an educational ambassador for conservation of this group of species? No None of the Phylacomantis species seems to be suited for an ambassadorial role.
17 Mandate Is there an existing conservation mandate recommending the ex situ conservation of this taxon? No
18 Range State approval Would a proposed ex situ initiative for this species be supported (and approved) by the range State (either within the range State or out-of-country ex situ)? Yes / probably
19 Founder specimens Are sufficient animals of the taxon available or potentially available (from wild or captive sources) to initiate the specified ex situ program? Yes / probably This taxon seems to be the most abuntant of the arid-adapted Phylacomantis species.
20 Taxonomic status Has a complete taxonomic analysis of the species in the wild been carried out, to fully understand the functional unit you wish to conserve (i.e. have species limits been determined)? No There is a chance that a taxonomic revision of the Phylacomantis subgenus will take palce in the near future. The confusion is however only limited to the identification of the true corvus.