Southern Utah's potholes host a surprising secret: aquatic 'time travelers'

Tadpole shrimp swim in a seasonal pond at The Wave, Ariz. Fairy shrimp and triops, a type of tadpole shrimp, are just two animals that might be spotted in ephemeral ponds.

Tadpole shrimp swim in a seasonal pond at The Wave, Ariz. Fairy shrimp and triops, a type of tadpole shrimp, are just two animals that might be spotted in ephemeral ponds. (Dorreen Dickinson, St. George News)


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ST. GEORGE — "Life finds a way," Dr. Ian Malcolm argued in "Jurassic Park," and so it holds true for the aquatic creatures living in southern Utah's seasonal pools.

Throughout the region, hikers may see depressions or water pockets in sandstone called potholes, such as those in Zion National Park or Snow Canyon's petrified sand dunes. Snow Canyon State Park lead ranger Josey Gardner said visitors should not walk in them even when dry to avoid crushing eggs as they seasonally fill with water and spring to life.

Fairy shrimp and triops, a type of tadpole shrimp, are just two animals that might be spotted in ephemeral ponds, Gardner told St. George News.

"They're just waiting for water in order to come back to life," she said.

These small, ancient-looking creatures are branchiopods, a class of crustaceans that also includes brine shrimp, water fleas and clam shrimp.

A swarm of fairy shrimp was found in deep tire tracks near Duck Creek, where they laid eggs. In Arizona, Dorreen Dickinson said she found triops swimming in a small pothole while hiking at The Wave.

Read the full article at St. George News.

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