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Bolson tortoise

Bolson tortoise
Itzelbolson1small.jpg
Bolson tortoise
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Testudines
Suborder: Cryptodira
Superfamily: Testudinoidea
Family: Testudinidae
Genus: Gopherus
Species: G. flavomarginatus
Binomial name
Gopherus flavomarginatus
Legler, 1959
Synonyms
  • Gopherus flavomarginatus Legler, 1959
  • Gopherus polyphemus flavomarginatus Wermuth & Mertens, 1961
  • Gopherus huecoensis Strain, 1966
  • Gopherus flavomarginata Auffenberg, 1974

The Bolson tortoise (Gopherus flavomarginatus), also called the Mexican giant tortoise or yellow-margined tortoise, is a species of tortoise from North America. Of the four North American tortoise species, it is the largest, having a carapace length of about 46 cm (18 in). It lives in a region of the Chihuahuan Desert known as the Bolsón de Mapimí, which is located in north-central Mexico.

The Bolson tortoise was discovered only in 1959. The legend is that a group of biologists working in the Bolsón de Mapimí were at a ranch and saw chickens eating out of a large tortoise shell. They inquired about the origin of the shell and the locals responded by saying that it was, "la tortuga grande del desierto," the big turtle of the desert.

In 1979 the 340,000 hectare Mapimi Biosphere Reserve was created to protect the Bolson Tortoise and other unique flora and fauna of the Bolsón de Mapimí. Despite this designation, cattle ranching and mining still occur in the Reserve. Whether this is detrimental to the tortoise is not known.

The most recent research, published in 1991 from data collected in 1983, estimates that fewer than 10,000 tortoises remain in the wild. Populations have declined mostly due to overcollecting for food and the pet trade. Incursion of roads, railroads and agricultural development have accelerated the decline of the species in the last 40 years. In the central portion of its range locals are keenly aware of the tortoise’s protected status and aid in its conservation. However, in the northeastern portion of its range, near La Sierra Mojada, populations of the tortoise are low. It is believed that tortoises are still collected and eaten in this area. Additionally, extensive brush clearing operations are being conducted to make way for cattle grazing. In 2008, following the construction of federally subsidized ethanol plants, extensive corn farming operations began within the Mapimi Biosphere Reserve. Farms have been tilled in tortoise habitat, despite its protected status.

In the fall of 2006, 26 Bolson Tortoises were translocated from the Audubon Appleton-Whittell Research Ranch in Elgin, Arizona to Ted Turner’s Armendaris Ranch in south-central New Mexico, a Chihuahuan desert environment within the prehistoric range of this species. These tortoises, known as the Appleton tortoises in commemoration of Ariel Appleton, a champion of Bolson tortoise conservation, were originally brought to Arizona from Durango, Mexico by Dr. David Morafka in 1973. Four tortoises from the Appleton population were established at the Living Desert Museum in Carlsbad, New Mexico. Both locations have active breeding programs in place.


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Wikipedia

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