美国《国家地理》每日一图 ：2014年8月

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Achilles Tang
Photograph by Brian Skerry, National Geographic

In other places around the world, coral has been decimated by bleaching and disease, but the southern Line Islands’ reefs retain their resilience. Scientists believe the key to coral health is intact ecosystems, where all the native species—including planktivores such as the vividly marked Achilles tang seen here—play their part.

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Winter Wilderness
Photograph by Michael Melford, National Geographic

Snow clings to aspens near Taos, New Mexico, in the Sangre de Cristo Mountains. A proposal to protect 45,000 acres here in the Carson National Forest is one of some 30 wilderness bills before the U.S. Congress.

Since President Lyndon Johnson signed the Wilderness Act in 1964, the number of wilderness areas has increased to more than 750.

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Worth His Salt
Photograph by Viet Thanh Nguyen, National Geographic Your Shot

A salt worker labors at a salt field in the Dien Chau district of Vietnam's Nghe An Province. The district's salt workers sell their product year-round at roadside markets.

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Spider Hole
Photograph by Fay Stout, National Geographic Your Shot

"The Dallas Arboretum in Dallas, Texas, is my 'happy place' to spend time photographing the flowers and garden critters," writes Your Shot member Fay Stout. "I was fascinated by the webs covered with water droplets on a low hedge in the Women's Garden but didn't immediately see the tiny spiders that were crawling out of the holes in the webs' centers. When I looked more closely, I saw them and tried to capture one with my macro lens."

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Tree of Life
Photograph by Jeff Nelson, National Geographic Your Shot

Tourists flock to a lone tree along the path of Hadrian’s Wall in northern England. Built between 122 A.D. and 128 A.D., the wall spans a 73-mile neck of land between the Tyne and the Solway Firth—a solid northern boundary for the entire Roman Empire. It’s often considered the most important relic of Roman rule in Britain.

"I wanted to get the photo without people, but that wasn't possible," says photographer Jeff Nelson. "In the end, I feel they give the photo better perspective."

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A Devilish Display
Photograph by Anibal Trejo, National Geographic Your Shot

Firecrackers douse raucous revelers in a steady stream of sparks during a celebration of Correfoc, or “fire runs,” in Sant Quintí de Mediona, Spain. A Catalan tradition, the festival features groups of participants known as "devils" running wild among the narrow streets, igniting fireworks along the way.

“The shooting conditions are really dangerous for the photographer,” writes Your Shot photographer Anibal Trejo. “I had to protect myself to avoid burnings, dressing up with long sleeves, protective glasses, a hat, handkerchief, and even gloves.”

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Gila Wilderness
Photograph by Michael Melford, National Geographic

This rugged wilderness was the precursor to the 1964 Wilderness Act. Forty years before the act was signed by President Lyndon Johnson, 755,000 acres in New Mexico’s Gila National Forest, including the Middle Fork of the Gila River, became the world’s first designated wilderness.

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Hoop Dreams
Photograph by Aizuddin Saad, National Geographic Your Shot

A performer with Switzerland’s Swiss Dream Circus nimbly twirls hula hoops around her arms and legs. “In Malaysia, it’s really hard to see a circus show … without animals involved,” writes Your Shot member Aizuddin Saad. “When I heard that a group of circus performers was doing a show in Kuala Lumpur, I took a chance to document circus life.”

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On the Rocks
Photograph by Matthieu Paley, National Geographic

Greenland's Inuit survived for generations eating almost nothing but meat in a landscape too harsh for most plants. Today markets offer more variety, but a taste for meat persists.

The 64 residents of the remote east Greenland village of Isortoq, pictured here, still hunt and fish but combine traditional Inuit foods with purchases from the supermarket, the large red building in the foreground. A favorite dish: seal dipped in ketchup and mayonnaise.

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Under the Hill
Photograph by Richard Barnes, National Geographic

The successors of Roman Emperor Nero largely buried his legacy from view. Beneath the Oppian Hill (at left) the remains of the palace—the Domus Aurea, or Golden House—built by and for Nero are closed to the public. By contrast, the Colosseum receives more than 10,000 visitors a day.

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Tip of the Iguana
Photograph by Lorenzo Mittiga, National Geographic Your Shot

Not quite as threatening as some sea monsters, a spiny-backed iguana floats by photographer Lorenzo Mittiga in the Bonaire Caves of the Dutch Caribbean.

"There I was, fully equipped with my camera, its underwater housing, and a wide-angle lens, preparing for the final setting of the sun, when a friend interrupted my solitude," writes Mittiga, a member of our Your Shot community. “He had dived into the water above my head and was swimming around the entrance of the cave, as if to say 'hello' to me.”

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Sacred Land
Photograph by Michael Melford, National Geographic

Patos Island, one of Washington's San Juan Islands, is part of a thousand-acre national monument created last year by President Barack Obama. Wilderness, a higher form of land protection, covers 350 acres of the San Juans.