Living Laboratory: Studying Life’s Origins in Cuatro Ciénegas

This desert oasis isn’t a mirage.
It’s a living laboratory for studying life’s origins—a unique environment that research spearheaded by Rice scientists may help protect.

By Deborah J. Ausman
Photography: Tommy LaVergne

The desert seems lifeless and still. In the midday heat, there are no birds, or rodents, or even an irritating fly to keep you company as you trudge across the crunchy white sand and awkward tufts of short, hard grasses. Shielding your eyes from the sun’s glare, you scan the dry landscape and whistle appreciatively at the lake-size mirage reflected at the base of the powder-white gypsum hills in the distance. Marveling at the physical laws responsible for this illusion, you hike on—until, with a squish, you find yourself ankle-deep in mud.

In Cuatro Ciénegas, a valley nestled among five 10,000-foot peaks in Mexico’s Chihuahuan desert, the mirages are real. Water abounds—this lake is one of 450 desert springs, or pozas, scattered about the 200-acre region and supplied with clear, 90° F water by way of an underground complex of interconnected geothermal ducts. Life flourishes here. Cuatro Ciénegas is home to 70 species of plants and animals that can be found nowhere else on Earth, including box turtles that spend their lives in the water rather than on land, several species of tropical-looking fish, and white curlicue snails no larger than a pinhead.

Even that crunchy white sand is more than it seems. Probe beneath the surface, and you’ll find a thin stripe of green running through the soil. The “sand” is fossilized cyanobacteria, and the descendants of the dead microbes form that stripe. The cyanobacteria are everywhere in Cuatro Ciénegas, though the extent of their industry is most apparent in the pozas, where hordes of living cyanobacteria join together in coral-like structures called stromatolites to form yawning caves and treacherous shelves.

Cuatro Ciénegas has been compared to the Galapagos Islands, except that its endemic species are separated from the rest of the world by mountains and a sea of sand rather than water. Yet for all of its geological and biological wonders, the biggest marvel for Cuatro Ciénegas may be its continued existence. The Mexican government declared the area protected more than a decade ago, but enforcement is lax. The scenery is marred by litter left by tourists and blown from an uncovered dump, and the region’s resources—from the gypsum to the mesquite to the water itself—are poached by the economically depressed community.

Science may be Cuatro Ciénegas’s salvation. Researchers worldwide, such as Rice biologist and statistician Janet Siefert, are finding the region a unique outdoor laboratory for biological and geological studies. Their visits offer the community a new potential income source. More importantly, researchers like Siefert are turning into the region’s most vocal advocates. By preserving Cuatro Ciénegas for today’s scientific experiments, Siefert and her colleagues may ultimately be ensuring that the region remains pristine for generations to come.

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