Vitamin D deficiencies have long been a concern in high latitudes because sunlight — which stimulates its production in the body — is scarce in winter months.

An enzyme protects squirrels during and after hibernation, and something similar could help people whose hearts shut down, a new study finds.

Air emissions from Prudhoe Bay-area oil fields can have a big influence on the particles in the air in Utqiaġvik, the town formerly known as Barrow.

Interior Alaska’s hot and dry summer of 2013, coupled with an invasion of insect pests, has taken a steep toll on the region’s birch trees, experts say.

Arctic sea ice last month reached its greatest extent for the season, and it was the lowest in the satellite record. Now researchers say that ice is also younger and thinner than it once was.

The animals didn't necessarily become sick, researchers said, but were encountering the new pathogens much more frequently.

Disaster funds are reserved for single events, and storms that collectively cause much damage aren't often individually large enough to count as disasters.

Elodea, a fast-growing leafy plant, is now in a roadside ditch at the marsh, and a response plan is in the works.

A decades-long decline in salmon in the Yukon River has reached a crisis this year, forcing harvest closures and prompting emergency shipments of salmon from other regions of Alaska to river residents who are otherwise facing food shortages.

The 2007 fire was probably the first for that area in 6,500 years, according to scientific evidence examined later, Higuera said. But the wait for the next big burn won't be nearly as long, according to the evidence gathered in the study.

When 200 million metric tons of rock tumbled down a remote Southeast Alaska mountain in October, nobody was around to see it. But thanks to a beefed-up seismic network and a new system that can distinguish landslides from earthquakes, scientists knew it had happened.

Every year since 2015, the Bering Sea has melted out earlier than in every year before 2015. If heat is killing animals, scientists have yet to pin down exactly how it is doing so.

Clams collected in late August had concentrations of saxitoxin considered dangerous for human consumption. The samples were collected in August about 70 miles north of St. Lawrence Island and about 50 miles north of Cape Lisburne, much further north than previously documented.

Following another year of stark climate impacts in the Arctic, scientists warned Tuesday of a new scourge hitting the region: marine trash. With the region warming twice as fast as the rest of the world, sea ice that has long blanketed the Arctic Ocean is disappearing, opening new routes to shipping.

The booming Bristol Bay salmon run has broken the record set just last year, while on the Yukon River, Chinook are too scarce to harvest.

Smoke from wildfires in Alaska could cause very unhealthy air quality conditions and low visibility over the weekend in Anchorage, the state's largest city, officials said.

A new report identifies climate change as one of the challenges facing transportation in Alaska's most famous national park.

In New England where ticks have decimated moose, the average tick load is 40,000, and some have been found with 90,000.

Climate-induced habitat changes on Alaska's North Slope such as coastal erosion and permafrost thaw have produced more food for migrating brant, a study says.

A parasite-riddled seal afraid of the water is the first Alaska marine mammal rescued in 2017. The seal will not be returned to the wild if it continues to survive rehabilitation at the Alaska SeaLife Center in Seward.