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St. Anthony Sand Dunes

Ecology

Skeletons of once-buried plants scattered around the dunes attest to the difficulty of life in active sand dunes.  When you also consider the hot, dry summers, the cold, snowy winters and that only 13.4 inches of precipitation falls on the dunes each year, the challenges that the St. Anthony Sand Dunes present to life become clear.

In spite of the conditions, plants and animals do live in and around the dunes. The first plants to invade the open sands are grasses like sand wildrye and scurfpea. After about 30 years, those pioneer plants have stabilized the sand sufficiently for rubber rabbitbrush and bitterbrush to begin their invasion. It can take as long as 700-900 years for the final, climax community of bitterbrush and chokecherry to become fully established.

Although you might expect the dunes to be inhospitable for animals, visitors will usually find the dunes crisscrossed with the tracks of small rodents, birds, and insects. In addition, many hooved animals migrate long distances to overwinter in and around the dunes, including pronghorn antelope, mule deer, elk and moose. In fact, the St. Anthony Sand Dunes hosts the largest desert wintering moose population in North America.

These dunes are such a unique environment that several plants and animals live only at St. Anthony Sand Dunes. The sand evening-primrose is found nowhere else, and its relative the pale evening-primrose occurs in a special pubescent, or hairy form, that is known to grow only in these dunes. In addition, the St. Anthony Sand Dunes boasts the largest and most viable population of a rare tiger beetle known from only two other locations, both in southern Idaho.


St. Anthony Sand Dunes (credit: DuneRatt LLC)