Overview

Comprehensive Description

Description

M ca. 23 mm. Dorsally two distinct unconnected and discontinuous pairs of dorsolateral ridges. No continuous white stripe along the upper lip.

Variation: G. decaryi as currently defined is a complex of various new, undescribed species.

Taken with permission from Glaw and Vences (2007).

  • Glaw, F. and Cadle, J. (2008). Gephyromantis decaryi. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 14 April 2009.
  • Glaw, F., and Vences, M. (2007). Field Guide to the Amphibians and Reptiles of Madagascar. Third Edition. Vences and Glaw Verlag, Köln.
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Distribution

Range Description

This species is known from many localities in south-eastern Madagascar from Ranomafana south to Midongy-du-Sud, from 700-1,050m asl.
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Distribution and Habitat

Midongy du Sud, Vevembe, Vohiparara, Vondrozo. It occurs between 700-1050m asl in primary and secondary rainforest and sometimes in disturbed habitats (Glaw and Cadle 2008).

  • Glaw, F. and Cadle, J. (2008). Gephyromantis decaryi. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 14 April 2009.
  • Glaw, F., and Vences, M. (2007). Field Guide to the Amphibians and Reptiles of Madagascar. Third Edition. Vences and Glaw Verlag, Köln.
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Ecology

Habitat

Madagascar Subhumid Forests Habitat

The Lac Alaotra bamboo lemur (Hapalemur griseus aloatrensis) is strictly endemic to the Madagascar subhumid forests ecoregion. This ecoregion, coveris most of the Central Highlands of Madagascar, and boasts a considerable number of endemic species, found chiefly in the relict forest patches and also in some wetland areas. The rainfall here is approximately 1500 mm per year, although it may amount to as much as 2000 mm in the Sambirano area in the northwest and as little as 600 mm in the southwest.

The underlying geology of the ecoregion is mainly ancient Precambrian basement rocks that have been deformed and uplifted over millions of years. There are a few areas of more recent lava flows, and some alluvial deposits associated with wetlands. Vast grasslands now cover much of the central highlands at elevations ranging from 1000 to 1500 metres. The majority of this upland area was formerly forested, and native peoples have affected the fauna and flora through massive deforestation.

Many mammalian taxa are endemic to this ecoregion, including a number of lemurs and numerous shrews, tenrecs and rodents. A far larger number of species are near endemic, with the majority of these shared with the lowland forests to the east. At least 45 species of mammals are found only in the subhumid forest ecoregion and the lowland forest ecoregion of Madagascar and these include, for example, two species of bamboo lemurs (Hapalemur aureus and H. simus).

Of the endemic and near-endemic mammal species in the ecoregion, 12 species listed are on the IUCN Red List; nine species are considered vulnerable; two are endangered and one (the Alaotran gentle lemur) is critical. In the Analavelona forest a species of small mammal was recently discovered, Microgale nasoloi, that is only known from this site and the nearby Zombitse-Vohibasia Forest, the latter being classified in the Madagascar succulent woodlands ecoregion. In addition to the large number of mammalian endemics, there are many special status mammals in the ecoregion, including the Vulnerable Aquatic tenrec (Limnogale mergulus); the Near Threatened Aye aye (Daubentonia madagascariensis);

Two endemic bird species are found in the wetlands of this ecoregion, and others are confined to the subhumid forests or shared with other Madagascar ecoregions. In the wetlands, both the Alaotra little grebe (Tachybaptus rufolavatus) and the Madagascar pochard (Aythya innotata), are considered critically endangered and may be extinct. In the forests the endemic species include, for example, a new genus and species only named a few years ago called the cryptic warbler (Cryptosylvicola randrianasoloi), the yellow-browed oxylabes (Crossleyia xanthophrys), and the brown emutail (Dromaeocercus brunneus). Several other species of birds found here are limited to marshland habitats on Madagascar, including the slender-billed flufftail (Sarothrura watersi), Madagascar snipe (Gallinago macrodactyla), and Madagascar rail (Rallus madagascariensis). Further, Appert’s greenbul (Xanthomixis apperti), an endemic species with a very limited geographical distribution, is abundant on the upper reaches of the Analavelona Massif. More than 20 other bird species that occur in the subhumid forests of this ecoregion are shared only with the eastern lowland forests ecoregion.

The Madagascar subhumid forests hold more than twenty strictly endemic amphibians. Several groups of amphibians include more than one endemic species, such as the microhylids Rhombophryne testudo, Scaphiophryne goettliebi, the mantellids Vulnerable Elegant Madagascar frog (Spinomantis elegans); Mantella crocea, M. cowani, M. eiselti, Mantidactylus domerguei, and the Near Threatened Decary's Madagascar frog (Gephiyromantis decaryi); and the rhacophorids Boophis laurenti and B. microtympanum. Other notable amphibian endemics include:the Benavony stump-toed frog (Stumpffia gimmeli)/

There are a number of special status amphibians in the ecoregion including the Near Threatened Ambohimitombo bright-eyed frog (Boophis majori); the Vulnerable Andoany stump-toed frog (Stumpffia pygmaea); the Endangered Andringitra Madagascar Frog (Mantidactylus madecassus); and the Near Threatened Betsileo Bright-eyed Frog (Boophis rhodoscelis).

There are at least 25 strictly endemic reptiles in this ecoregion. These numbers include historically described species as well as newly identified taxa. Numerous speciess of chameleon and dwarf chameleon only occur in this ecoregion, including Calumma oshaughnessyi ambreensis, C. tsaratananensis, Furcifer petteri, Brookesia ambreesis, B. antakarana, B. lineata, and B. lolontany in the northern and northwestern portion; and C. fallax, F. campani, and F. minor in the central and southern portions. Otpher lizard species endemic to the ecoregion include the skinks Mabuya grnadidieri, M. madagascariensis, M. nancycoutouae, Amphiglossus meva, and Androngo crenni; the geckos Lygodactylus blanciL. decaryi and Phelsuma klemmeri, and the Plated lizard Zonosaurus ornatus. There are also a few endemic species of snakes including Pseudoxyrhopus ankafinensis, Liopholidophis grandidieri, and L. sexlineatus.


  • Du Puy, D.J. and Moat, J. 1996. A refined classification of the primary vegetation of Madagascar based on the underlying geology: using GIS to map its distribution and to assess its conservation status. In W.R. Lourenço (editor). Biogéographie de Madagascar, pp. 205-218, + 3 maps. Editions de l’ORSTOM, Paris. ISBN: 2709913240
  • World Wildlife Fund and C.MIchael Hogan/. 2015. Madagascar subhumid forests. Encyclopedia of Earth. National Council for Science and Environment. Washington DC
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Habitat and Ecology

Habitat and Ecology
It inhabits primary and secondary rainforest, and is sometimes found in quite disturbed habitats. Breeding takes place by direct development, and away from water.

Systems
  • Terrestrial
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
NT
Near Threatened

Red List Criteria

Version
3.1

Year Assessed
2008

Assessor/s
Glaw, F. & Cadle, J.

Reviewer/s
Stuart, S.N., Chanson, J.S. & Cox, N.A.

Contributor/s

Justification
Listed as Near Threatened because its Extent of Occurrence is probably not much greater than 20,000 km2, and the extent and quality of its habitat are probably declining, thus making the species close to qualifying for Vulnerable.
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Population

Population
It is a locally common species.

Population Trend
Decreasing
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Life History, Abundance, Activity, and Special Behaviors

Habits: Similar to G. boulengeri. Often heard also from secondary vegetation far from any forest, e.g., in the village of Vondrozo.

Calls: A relatively slow series of 40-50 unharmonious notes.

Breeding takes place by direct development (Glaw and Cadle 2008).

  • Glaw, F. and Cadle, J. (2008). Gephyromantis decaryi. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 14 April 2009.
  • Glaw, F., and Vences, M. (2007). Field Guide to the Amphibians and Reptiles of Madagascar. Third Edition. Vences and Glaw Verlag, Köln.
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Threats

Major Threats
This species is threatened by the loss and degradation of its forest habitat due to subsistence agriculture, timber extraction, charcoal manufacture, invasive spread of eucalyptus, livestock grazing and expanding human settlements.
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Life History, Abundance, Activity, and Special Behaviors

This species is threatened by the loss and degradation of its forest habitat due to subsistence agriculture, timber extraction, charcoal manufacture, invasive spread of eucalyptus, livestock grazing and expanding human settlements. It occurs in Parc National de Ranomafana, the Réserve Spéciale du Pic Ivohibe, and Parc National de Midongy-du-Sud (Glaw and Cadle 2008).

  • Glaw, F. and Cadle, J. (2008). Gephyromantis decaryi. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 14 April 2009.
  • Glaw, F., and Vences, M. (2007). Field Guide to the Amphibians and Reptiles of Madagascar. Third Edition. Vences and Glaw Verlag, Köln.
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Management

Conservation Actions

Conservation Actions
It occurs in Parc National de Ranomafana, the Réserve Spéciale du Pic Ivohibe, and Parc National de Midongy-du-Sud.
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Wikipedia

Mantidactylus decaryi

Mantidactylus decaryi is a species of frog in the Mantellidae family. It is endemic to Madagascar. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, and heavily degraded former forest. It is threatened by habitat loss.

Source[edit]

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