Angonoka tortoise

Astrochelys yniphora

The angonoka tortoise is a critically endangered species of tortoise endemic to Madagascar. It is also known as the angonoka, ploughshare tortoise, Madagascar tortoise, or Madagascar angulated tortoise.
Angonoka tortoise at Ankarafantsika Angonoka Tortoise at the Durrel Wildlife Conservation Trust, Ankarafantsika NP, 31.10.2016

 Angonoka Tortoise,Angonoka tortoise,Ankarafantsika,Astrochelys yniphora,Madagascar

Appearance

The carapace is highly domed and light brown in colour with prominent growth rings on each scute. The outer parts of the vertebral are a darker brown. The gular scute of the plastron projects forward between the front legs and curves upward toward the neck.

Males are larger than females, reaching a carapace length up to 17 in . The average length of an adult male angonoka tortoise is 414.8 mm and the average weight is 10.3 kg . Females measure at a 370.1 mm average and weigh 8.8 kg on average.

Distribution

In the wild, this species is only found in Madagascar, where it is endemic to the dry forests in the Baly Bay area of northwestern Madagascar, near the town of Soalala ....hieroglyph snipped... The distribution is 25 to 60 km2 in range around Baly Bay.

The Baly Bay region is made up of savanna, mangrove swamps, and dry deciduous forest. They make use of bamboo-scrub habitat which is made up of different types of shrubs, savanna grasses, bamboo, and open areas with no vegetation. The flora includes shrubbery usually under 2 m in height, such as ''Bauhinia'' and ''Terminalia'' species, and ''Perrierbambus madagascariensis'' bamboo, which forms dense thickets. The elevation of this area is under 50 m above sea level.
The population estimate for the angonoka tortoise in the wild is about 600 individuals, ranging from 440 to 770, but is still decreasing. The tortoise is at an extremely high risk of extinction; it is thought it will become extinct in the wild in the next 10 to 15 years. It can be found in five subpopulations, two east and three west of the Andranomavo River. The two to the east are Beheta and Sada; the three to the west are Ambatomainty, Andrafiafaly, and Betainalika.

Status

This species is one of the rarest land tortoises in the world, classified as Critically Endangered on the IUCN Red List. The principal threats to the species are believed to be fires started to clear land for cattle grazing, and collection for the pet trade. The tortoise has a restricted distribution, likely a result of past collection for food, the expansion of agriculture, and accompanying fires. An additional threat is predation by the bushpig. Fires made to clear land can get out of control, turning into wildfires, which cut back more of the angonoka tortoise's habitat. Following efforts to create firebreaks through controlled fires in savanna fringes by conservation groups, out-of-control fires have decreased, until less than 50 ha of its habitat were burnt in 2004.

The angonoka tortoise is often captured to be sold in the international pet trade. Though some enforcement of restrictions on illegal trade is successful, including the confiscation of the illegally obtained tortoises, they remain in incredibly high demand for the global pet trade. This is a major threat to the tortoises remaining in the wild. Conservationists mark the shells with identifying marks which mars the most attractive feature and make them less desirable to poachers and wealthy collectors. The engraving is a last-ditch effort to protect the animals.

In addition to its Red List listing, the angonoka tortoise is now protected under the national law of Madagascar and listed on CITES Appendix I, commercial trade in wild-caught specimens is illegal . For the conservation of the angonoka tortoise, the Durrell Wildlife Conservation Trust created Project Angonoka in 1986. The Water and Forests Department, the Durrell Trust, and the World Wide Fund for Nature work together on this project. A captive-breeding facility was established for this species in Madagascar in 1986 by the Jersey Wildlife Preservation Trust in collaboration with the Water and Forests Department. In May 1996, 75 tortoises were stolen from the facility. The thieves were never found, but 33 tortoises later appeared for sale in the Netherlands. The project ultimately was a success, achieving 224 captive-bred juveniles out of 17 adults in December 2004. After the 1990s, Project Angonoka started ecological research on the tortoise and the development of conservation plans that involved the communities surrounding the habitat. The work with the community involved local people in making firebreaks, along with the creation of a park proposed by the community to protect the tortoise and the forests. Monitoring of the angonoka tortoise in the global pet trade has continued to be advocated.

In March 2013, smugglers were arrested after carrying a single bag containing 54 angonoka tortoises and 21 radiated tortoises through Suvarnabhumi International Airport in Thailand. The 54 angonoka tortoises might be as much as a tenth of the world's population of the species.

On 20 March 2016, the Custom officials at Mumbai airport seized 146 tortoises from a mishandled baggage of a Nepal citizen. This bag was said to belong to a transit passenger, who arrived from Madagascar and flew to Kathmandu leaving this bag behind. Out of the 146 tortoises, 139 were radiated tortoises and seven were angonoka tortoises , both critically endangered tortoise species of Madagascar. Two radiated tortoises were found dead with broken shell.

On 12 June 2016, it was reported that 6 angonoka tortoises and 72 radiated tortoises had gone missing from a breeding facility in Thailand.

Behavior

The angonoka tortoise has been observed feeding on grasses found in open rocky areas of bamboo scrub. It is also known to eat shrubs, forbs, and herbs. While it has been seen eating dead bamboo leaves, it has never been observed eating living bamboo. As well as these plants, the tortoise has also been seen eating the dried feces of bushpigs and carnivores.

The introduced bushpig is the main predator of the angonoka tortoise; it eats the tortoises' eggs and young.

It is expected to become sexually mature once reaching 15 years old. The tortoise can produce one to six eggs per clutch and up to four clutches every season. The reproductive season is from January 15 to May 30. The angonoka tortoise's reproductive patterns coincide with the seasonal rainfall patterns of the region, with both mating and hatching occurring at the onset of the rainy seasons. With a 71.9% fertility rate and a 54.6% hatching success rate, about 4.3 hatchlings are produced per female tortoise.

In captivity, males must be separated due to aggression towards each other, including ramming, pushing, and overturning with the enlarged gular scute. The aggression is used to establish dominance.

Habitat

In the wild, this species is only found in Madagascar, where it is endemic to the dry forests in the Baly Bay area of northwestern Madagascar, near the town of Soalala ....hieroglyph snipped... The distribution is 25 to 60 km2 in range around Baly Bay.

The Baly Bay region is made up of savanna, mangrove swamps, and dry deciduous forest. They make use of bamboo-scrub habitat which is made up of different types of shrubs, savanna grasses, bamboo, and open areas with no vegetation. The flora includes shrubbery usually under 2 m in height, such as ''Bauhinia'' and ''Terminalia'' species, and ''Perrierbambus madagascariensis'' bamboo, which forms dense thickets. The elevation of this area is under 50 m above sea level.
The angonoka tortoise has been observed feeding on grasses found in open rocky areas of bamboo scrub. It is also known to eat shrubs, forbs, and herbs. While it has been seen eating dead bamboo leaves, it has never been observed eating living bamboo. As well as these plants, the tortoise has also been seen eating the dried feces of bushpigs and carnivores.

The introduced bushpig is the main predator of the angonoka tortoise; it eats the tortoises' eggs and young.

It is expected to become sexually mature once reaching 15 years old. The tortoise can produce one to six eggs per clutch and up to four clutches every season. The reproductive season is from January 15 to May 30. The angonoka tortoise's reproductive patterns coincide with the seasonal rainfall patterns of the region, with both mating and hatching occurring at the onset of the rainy seasons. With a 71.9% fertility rate and a 54.6% hatching success rate, about 4.3 hatchlings are produced per female tortoise.

In captivity, males must be separated due to aggression towards each other, including ramming, pushing, and overturning with the enlarged gular scute. The aggression is used to establish dominance.

References:

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Status: Critically endangered
EX EW CR EN VU NT LC
Taxonomy
KingdomAnimalia
DivisionChordata
ClassReptilia
OrderTestudines
FamilyTestudinidae
GenusAstrochelys
SpeciesA. yniphora
Photographed in
Madagascar