Excellent Breeding Success for Endangered Bolson Tortoises at New Mexico State Park
Nine Eggs Hatch, Nine Others Expected at Living Desert Zoo and Gardens State Park
CARLSBAD, NM - Less than a year after four endangered Bolson tortoises were brought to Living Desert Zoo and Gardens State Park in Carlsbad, nine eggs have hatched with an additional nine expected to come out of their shells by mid September.
The hatchlings range in weight from 30 to 38 grams (less than a pound), and are the results of 19 eggs laid within two laying periods, three weeks apart. This first group of hatchlings is beginning to feed on native grasses and carrots. Once established and fully adapted to solid food, the hatchlings will be available for public viewing.
“This is an exciting time at Living Desert; to have breeding success like this in our first season with these endangered tortoises is very rewarding for us and our partners at the Turner Endangered Species Fund,” said Park Superintendent Ken Britt. “We encourage people to come and see these special animals and learn about this important conservation effort.”
“We are excited to be collaborating with Living Desert, which has been a top-notch partner in this process,” said Joe Truett, Senior Biologist with Turner Endangered Species Fund who coordinated efforts with New Mexico State Parks. “Of course we are also thrilled about the new hatchlings at both Living Desert and the Ladder Ranch.”
Like Living Desert, the tortoises are also protected and housed in outdoor enclosures for protection at the Ladder Ranch, near Hillsboro and the Armendariz ranch near T or C. Truett says that, with the exception of the Armendariz ranch which is waiting for 15 eggs to incubate naturally outdoors, the tortoise hatchlings were incubated in a carefully controlled environment. The egg incubator mimics the conditions required for birds or reptiles to hatch their eggs, taking into consideration humidity, temperature and the number of times the eggs are turned over.
According to the Turner Fund, hatching the tortoises in an incubator has seemed to be more successful than hatching in the outdoors since the eggs are protected from elements including changing temperatures, depth changes, soil content and predators. The incubation period for most Bolson Tortoises is 75 to 85 days. Generally, female Bolson Tortoises can lay between two to 15 eggs at a time, with only an estimated 3 percent survival rate for the eggs.
The parents of the hatchlings - two male and two female Bolson tortoises - were originally introduced to Living Desert Zoo and Gardens State Park in October 2006 through a cooperative agreement and conservation program with media mogul Ted Turner’s “Turner Endangered Species Fund.” The Fund aims to conserve biodiversity by protecting endangered species and their habitat.
The growing family of tortoises is the only genetically pure Bolson’s on exhibit in an AZA Accredited Zoo in the country. The tortoise, native to the Chihuahuan Desert in Mexico, is listed as an internationally endangered species and is the largest tortoise of North America. The species was first placed on the federal endangered species list in 1979 after it was discovered that they were being hunted for food in the Mexican area of Bolson de Mapimi.
An additional population of breeding pairs is located on Ted Turner’s Armendaris Ranch in Sierra County, New Mexico. The conservation effort includes breeding programs, natural history research at both locations as well as an education program centered at the zoo. Through this cooperative conservation effort it is hoped to educate zoo visitors about the species and eventually see the Bolson Tortoise population increase in the wild.
Living Desert plans to keep the tortoise hatchlings at the park for at least a year, and then release them to the Armendaris Ranch who will eventually relocate them back into the wild.
Accredited by the Association of Zoos and Aquariums (AZA), Living Desert Zoo and Gardens State Park actively participates in species conservation and is dedicated to the plants and animals of Chihuahuan Desert ecosystem. The Bolson Tortoise conservation partnership compliments the zoo’s involvement in the Species Survival Plan for the Mexican Wolf, another federally endangered species.
For more information, contact Living Desert Zoo and Gardens State Park at (505) 887-5516 or www.nmparks.com. For information on the Turner Endangered Species Fund, log onto http://tesf.org/turner/tesf/.
Source: New Mexico State Parks
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