An ice worm on Bering Glacier.

An ice worm on Bering Glacier.

Ice worms: Enigmas of the north

Recent research on the ice worm has shone some light on the tiny creature that appears when the sun sets on warmish glaciers.

Few people have seen ice worms, but they are not mythical. Wispy and less than one inch long, ice worms live on glaciers, wriggling to the surface at night and sometimes lingering in meltwater pools during the day. They seem to be dormant during the winter. No one knows how long they live, or if they might have the ability to resurrect themselves after their bodies dry out.

The worms are both hardy and delicate. They live on ice, but will dissolve in the heat of your palm. Scientists in Washington once estimated there were more ice worms on a glacier there than there are humans on Earth. An ecologist once searched a good portion of the Alaska Range and found none.

That scientist, Roman Dial of Alaska Pacific University, condensed much of what is known about the ice worm in a recent paper.

Ice worms live on glaciers overlooking the Pacific coast from the Kenai Peninsula all the way down to Oregon. There is an unexplained absence of the worms in what seems like suitable habitat on the Juneau Icefield and glaciers near there.

The farthest north ice worms Dial found live in the Chugach Mountains behind Anchorage. After hearing mountaineers’ reports of seeing ice worms in the Alaska Range, Dial visited the reported locations and other likely spots. He squinted at patches of wet snow on the glaciers in similar places he’d seen worms on other glaciers. He and his partners saw no worms on the entire traverse.

Dial and his colleagues figured they found no worms on Alaska Range glaciers because those glaciers and others farther north are too cold. They wrote worms “do not inhabit glaciers with over-winter temperatures below negative 7 degrees C (19.4 degrees F) on the previous summer surface.”

Using tissue samples from a few of the worms Dial and others collected from their survey of 200 glaciers, they found ice worms have been around for at least a couple million years. Way back when, they may have diverged from a freshwater worm and adapted to life on ice.

Their DNA suggests ice worms belong to three groups so unlike the other they might be different species. Northern worms live in the Chugach Mountains. Central worms live in the Glacier Bay Region. Southern worms live in the British Columbia Coast Range, the Cascades of Washington and Oregon and the Olympic Mountains of western Washington. The southern worms are longer than their northern cousins and resemble black hairs.

Using the DNA results, Dial saw an oddity: Chugach-type worms crawling on glaciers near Sitka, Vancouver Island and the Olympic Peninsula of Washington. Since the worms don’t move very fast on their own, Dial and his coauthors figured birds might have spread them.


Migrating rosy finches and snow buntings probably feed on ice worms during late summer and fall after nesting in the alpine. When eating the worms, the birds may walk over the worms’ cocoons, which stick to their feet or bills. When the birds fly south, winds might force them to land on glaciers farther south. In this way, worm larvae might take a fabulous ride from southeast Alaska to Vancouver Island or the Olympic Peninsula.

Dial concludes the paper, published in Arctic, Antarctic, and Alpine Research, with thanks to all the graduate students who helped him during the past decade. One of those was his son. The 27-year-old disappeared while traversing Costa Rica’s Osa Peninsula in July 2014.

“This study is dedicated to the memory of Cody Roman Dial, who helped with fieldwork as a teenager (counting worms on Harding Icefield) and with genetic analysis (writing a paper on ice worms’ biogeography) as a young man.”

Since the late 1970s, the University of Alaska Fairbanks’ Geophysical Insti-tute has provided this column free in cooperation with the UAF research community. Ned Rozell is a science writer for the Geophysical Institute.

More in Neighbors

Fred LaPlante is the pastor at the Juneau Church of the Nazarene. (Photo courtesy of Fred LaPlante)
Living and Growing: Be a blessing

Years ago, I learned a great acronym, B.L.E.S.S. “B” stands for “Begin… Continue reading

Salad ingredients ready to assemble. (Photo by Patty Schied)
Cooking for Pleasure: Mexican corn and bean salad

Several years ago, I ate at a wonderful Mexican restaurant in Los… Continue reading

The interior of the Pipeline Skate Park on Dec. 7, 2023. (Mark Sabbatini / Juneau Empire file photo)
Neighbors briefs

Join interactive design meeting for Jackie Renninger Park on May 21 CBJ… Continue reading

A new online dictionary features Lingít, X̱aad Kíl, Shm’algyack and English. (Mircea Brown / Courtesy of Sealaska Heritage Institute)
Neighbors: Sealaska Heritage Institute debuts multilingual online Alaska Native dictionary with audio

Platform includes resources for Tlingit, Haida and Tsimshian languages.

Brent Merten is the pastor of Christ Lutheran Church in Juneau, a member of the Wisconsin Evangelical Lutheran Synod. (Photo courtesy of Brent Merten)
Living and Growing: Your room is waiting

Thursday, May 9, is a very special day. Although most calendars don’t… Continue reading

(Juneau Empire file photo)
Living and Growing: Twisting Scripture to suit themselves

Ever wonder why so many different people say so many different things… Continue reading

The Ward Lake Recreation Area in the Tongass National Forest. (U.S. Forest Service photo)
Neighbors: Public input sought as Tongass begins revising 25-year-old forest plan

Initial phase focuses on listening, informing, and gathering feedback.

Sister Sadria Akina, Elder Tanner Christensen and Elder Bronson Forsberg, all missionaries with the Church of Jesus Christ of Latter Day Saints, collect litter on April 22, 2023, in the Lemon Creek area. It was their first time partaking in Juneau’s communitywide cleanup. (Ben Hohenstatt / Juneau Empire file photo)
Neighbors briefs

Annual Litter Free citywide cleanup on Saturday Saturday is set for Litter… Continue reading

Tortilla beef casserole ready to serve. (Photo by Patty Schied)
Cooking for Pleasure: Tortilla beef casserole for Cinco de Maya

When my kids were growing up their appetites were insatiable. Every night… Continue reading

An aging outhouse on the pier extending out from the fire station that’s purportedly the only public toilet in Tenakee Springs in August of 2022. (Mark Sabbatini / Juneau Empire file photo)
Gimme a Smile: Is it artificial intelligence or just automatic?

Our nation is obsessed with AI these days. Artificial intelligence is writing… Continue reading

Adam Bauer of the Local Spiritual Assembly of Bahá’ís of Juneau.
Living and Growing: Embracing progress while honoring Our roots

I would like to take a moment to acknowledge that we are… Continue reading

Maj. Gina Halverson is co-leader of The Salvation Army Juneau Corps. (Robert DeBerry/The Salvation Army)
Living and Growing: “Don’t cry because it’s over, smile because it happened.”

Ever have to say goodbye unexpectedly? A car accident, a drug overdose,… Continue reading