March 18, 2006
Ice worms: They’re real, and they’re hotPosted
Ben Lee is stalking a creature most people think is a myth — if they’ve heard of it at all.
“I don’t know what we’ll see,” he warned, loading an ice ax and snow shovel into his backpack. “Nobody knows what ice worms do in winter.”
Lee, a senior at the University of Puget Sound, has come to Mount Rainier to find out.
Thriving in conditions that would turn most living things to Popsicles, these inch-long earthworm cousins inhabit glaciers and snowfields in the coastal ranges of Alaska, British Columbia, Washington and Oregon. They move through seemingly solid ice with ease and are at their liveliest near the freezing point of water. Warm them up slightly and they dissolve into goo.
Their life cycle remains a mystery.
But ice worms are beginning to yield their secrets to a few hardy scientists who see broad applications from understanding one of the planet’s oddest inhabitants.
NASA anted up $200,000 last year to explore the worms’ cold tolerance and what it might say about the possibility of life on Jupiter’s icy moons and other planets. That work could also improve cold storage of organs and tissues for transplantation.
As glaciers shrink in the face of global warming, interest is growing in ice worms and other animals whose habitat could melt away within the next 50 years. National Geographic funded one of the first field surveys to focus on ice-worm ecosystems.
“They’re kind of hot right now,” Lee said as he and roommate Dave Eiriksson strapped on their gear and headed up the slopes above Paradise.
The rare sunny day was perfect for “worming,” as the 23-year-old Lee calls it.
The men followed a snowshoe trail that wound steeply through stands of subalpine fir half-buried in pillowy drifts. More than 600 inches of snow fall here in an average year, and it’s hard to imagine anything without fur could survive.
“People don’t believe me when I tell them I’m studying ice worms,” said Lee, tall and lanky with curly hair and an infectious enthusiasm. “The words just don’t go together.”
A COLD-LOVING Minnesotan, Lee picked ice worms for his undergraduate biology thesis because they’re weird, haven’t been studied much and provide an excuse to get out in the mountains. He spent last summer gathering specimens from glaciers across the Olympic range.
In warmer weather, the black worms are hard to miss. As the sun sets, they swarm to the surface to feed on algae, pollen and other digestible debris.
“In some places, they’re so thick you can’t step without killing tons of them,” Lee said.
Before dawn, the worms retreat back into the ice. Their species name, solifugus, means sun-avoiding.
In winter, when algae can’t grow and snow blankets the surface, Lee suspects the worms simply stay deep inside the ice, perhaps in a dormant state.
His plan is to root them out.
“That’s where we’re headed,” he said after an hour’s uphill trudge, much of it following steps kicked into the snow by previous hikers. He pointed to a bowl below McClure Rocks at an elevation of about 7,000 feet.
It’s not a glacier, but the depression is filled with snow year-round and worms are regularly spotted there in the summer.
Kicking up knee-deep powder, Lee plunged down the incline.
On the floor of the basin, he grabbed his snow shovel, held it out like a divining rod and made beeping sounds as he tried to figure out where to dig.
“We’re flying by the seat of our pants,” he said cheerfully.
ICE WORMS WERE FIRST described in 1887 on the Muir Glacier in Alaska. Famed Seattle photographer Asahel Curtis took pictures of worms on Mount Olympus in 1907 and dubbed them “snow eels.”
But fiction, rather than fact, informed Yukon bard Robert Service, who made several references to ice worms in his poems and novels. He was probably inspired by journalist Elmer “Stroller” White, who, during the Klondike Gold Rush of the 1890s published tall tales in the Dawson City, Yukon, newspaper, describing 4-foot-long wigglers that came out of their lairs and chirped like birds when the mercury dropped below minus 74 Fahrenheit.
In “The Ballad of the Ice Worm Cocktail,” published in 1940, Service took up the theme and recounted the comeuppance of a boastful British nimrod who gagged when challenged to down a drink containing a “bilious blue” worm. It was really a piece of painted spaghetti, the poem reveals at the end. Bars in Alaska used to re-create the stunt for their customers.
While Service’s work survived, ice-worm studies languished for decades.
“A hundred years of research adds up to about this much paper,” Lee said, holding his thumb and index finger less than an inch apart.
Searching the Internet, he connected with biologists Dan Shain and Paula Hartzell, who between them probably account for the bulk of the world’s ice-worm expertise.
Shain’s first exposure came during a 1995 fishing trip to Alaska, when he saw a cartoon worm on a cafe placemat. He thought it was a joke until he saw the real thing on display at the Portage Glacier visitor center outside Anchorage.
A professor at Rutgers University in Camden, N.J., Shain has wrangled money from National Geographic and NASA for his studies on ice-worm physiology.
Hartzell, who worked with Shain, has surveyed more than 80 glaciers and is writing a book on the peculiar community of snow fleas, nematodes and spiders that dwell on the ice. As the largest invertebrate, ice worms dominate this frozen world.
“IT SUCKS TO DIG,” Eiriksson observed, panting. He was standing in the bottom of a seven-foot pit, shoveling snow while Lee took a break and gulped down a muffin.
In summer, Hartzell has found worms in blue ice more than six feet below the surface. Lee peered into a crevasse in Olympic National Park and spotted a worm 10 feet down, poking its head out of a sheer ice face.
Hartzell has seen them with their tails anchored in ice and their heads waving in meltwater streams.
She’s convinced they travel through tiny fissures in the ice, but other scientists have suggested the worms secrete a substance that melts a path, like a warm knife through butter.
Polar bears weather the cold with thick insulation and the ability to generate their own heat. Antarctic cod have blood laced with antifreeze. Ice worms don’t have any of these defenses.
Instead, they have the remarkable ability to boost their cells’ energy production when the temperature drops, Shain discovered. “It’s equivalent to putting more gasoline in your tank,” he said.
The worms also possess cell membranes and enzymes that function and stay flexible in temperatures where most animals’ cellular processes creak to a halt.
The downside is extreme sensitivity to heat. At about 40 degrees F, the worms’ membranes melt and their enzymes go haywire.
Shain’s NASA project focuses on a key enzyme that regulates the worms’ energy cycle.
Organs harvested for transplant deteriorate as the cells’ energy stores are depleted, he explained. Unraveling the ice worms’ metabolism may lead to drugs or chemical solutions that could keep organs alive longer.
It’s more of a longshot, but Shain thinks the worms might also hold clues to suspended animation, or cryonics — the freezing of people or organs. In his laboratory refrigerator, worms have lived up to two years with no apparent source of food.
BLUE SHADOW ENGULFED the basin at Mount Rainier where Lee and Eiriksson continued to toil in their wormless hole, now nearly 10 feet deep. A raven perched on a rock and cocked its head to survey the scene.
During warmer weather, when the worms are easier to find, Lee scooped up hundreds from pools of glacial meltwater, packed them in a cooler with snow and FedEx’d them to New Jersey for Shain’s enzyme studies.
For his own project, the UPS student is analyzing DNA from the Olympic worms, to see how they’re related to other populations.
Hartzell found northern worms are so different from their southern relatives as to almost be separate species. She also found tiny, remnant populations where receding glaciers have stranded colonies.
That doesn’t bode well for ice worms’ future.
Rising global temperatures are melting glaciers across the globe, and few are vanishing faster than those along the coast of North America.
“When those glaciers are gone, the ice worms are going to be gone,” Hartzell said.
BUT NOT YET.
“I found one!” Lee shouted from the bottom of the now-12-foot hole. “I think I see another one,” he said, kneeling to paw through the snow.
Using his ice ax for a step, he heaved himself to the surface.
“I can’t believe it,” he said, grinning. “The elusive ice worm.”
In each hand was a chunk of snow and what looked like a dark thread. The shorter of the two worms corkscrewed slowly, then froze — literally.
When Lee touched the tiny spiral, it snapped.
Even ice worms have their limits. Inside the insulating snow, temperatures remain near freezing. But the air temperature had dropped to about 20 F — below the ice-worm survival point.
“Oh well,” Lee said. “It’s still pretty exciting.”
Only two other researchers are known to have found wintering ice worms, both in Alaska late last year.
Now that scientists know they can unearth the worms in winter if they’re willing to dig deep enough, studies can begin to tease out the metabolic tricks that allow the creatures to endure months of entombment under the snow.
For Lee, it’s back to the lab, where he will continue sorting through his DNA results.
He’ll also devote time to another goal: memorizing Service’s 140-line ballad, with its fanciful description of ice worms on the Mountain of Blue Snow:
“Yet all is clear as you draw near — for coyly peeking out
Are hosts and hosts of tiny worms, each indigo of snout
And as no nourishment they find, to keep themselves alive
They masticate each other’s tails, till just the Tough survive.”
Sandi Doughton: 206-464-2491 or email@example.com
Copyright © 2006 The Seattle Times Company