Background Articles

Beavers were not previously recognized as an Arctic species, and their engineering in the tundra is considered negligible. Recent findings suggest that beavers have moved into Arctic tundra regions and are controlling surface water dynamics, which strongly influence permafrost and landscape stability. Here we use 70 years of satellite images and aerial photography to show the scale and magnitude of northwestward beaver expansion in Alaska, indicated by the construction of over 10,000 beaver ponds in the Arctic tundra. The number of beaver ponds doubled in most areas between ~ 2003 and ~ 2017. Earlier stages of beaver engineering are evident in ~ 1980 imagery, and there is no evidence of beaver engineering in ~ 1952 imagery, consistent with observations from Indigenous communities describing the influx of beavers over the period. Rapidly expanding beaver engineering has created a tundra disturbance regime that appears to be thawing permafrost and exacerbating the effects of climate change.

While the risk to human health is low, Gerlach has said that avian influenza could pose a threat to not only the state’s domestic birds but also wild birds, including geese, shore birds, vultures and eagles. There’s no treatment for birds that are infected, and the mortality rate for poultry and raptors like hawks, eagles or owls is especially high. Possible signs of infection includes the “sudden death of multiple birds in the flock, nasal discharge, sneezing, and coughing, or respiratory distress."

"Our hunters have a vast knowledge on a healthy bird. They know what a healthy bird looks like. If a goose has the symptoms of avian flu … people shouldn't eat it," said George Diamond of Cree Public Health.

News of avian flu outbreaks in dozens of states in the lower 48 have wildlife managers and bird hunters on edge as the spring migration gets underway in Alaska.

Zoos across North America are moving their birds indoors and away from people and wildlife as they try to protect them from the highly contagious and potentially deadly avian influenza. Penguins may be the only birds visitors to many zoos can see right now, because they already are kept inside and usually protected behind glass in their exhibits, making it harder for the bird flu to reach them.

Copper River Seafoods is ending its run in the old Snug Harbor Seafood plant, leaving one major salmon processor in the area.

On Thursday, for the first time, the sheen was reported in Krestof Sound, an area where Pacific herring are known to spawn in the spring.

Ten years ago, Mike Gibeau, then the carnivore biologist for Banff National Park, identified a problem: collisions between grizzly bears and trains were increasingly prevalent. Between 2000 and 2010, ten grizzly bears there were struck and killed by trains and several more unconfirmed strikes were reported.

Hotter weather and less rain drove the three-year drought.

Researchers documented the formation of new, irregularly shaped, steep-sided depressions. The largest was an oval-shaped depression 28 meters (92 feet) deep, 225 meters (738 feet) long, and 95 meters (312 feet) wide. The research team attributes these changes to intermittent seafloor collapse due to the gradual warming of the permafrost sediment frozen beneath the Arctic Shelf since the end of the last ice age.

High water temperatures were measured at Chilkat Lake weir in Alaska, raising concerns for the salmon population, although no harm to the fish has been reported so far.

Behavioral Health: More than two-thirds of Americans are anxious about climate change. They feel grief, anger and hopelessness. We spoke to people about the invisible scars of this growing crisis.

ConocoPhillips' massive Willow project would emit 284 million metric tons of carbon dioxide over its 30-year lifetime.

With marine heat waves helping to wipe out some of Alaska’s storied salmon runs in recent years, officials have resorted to sending emergency food shipments to affected communities while scientists warn that the industry’s days of traditional harvests may be numbered. Salmon all but disappeared from the 2,000-mile (3,200-kilometer) Yukon River run last year.

Just two days after temperatures dipped below -5 degrees Fahrenheit in Hooper Bay, they shot up above freezing, and it started to rain. That caused the water level in the lagoon to rise, and water started to flow through the crack, eroding the lagoon wall.

They have so far identified fewer than 100 hares in the Nome area, fewer than 20 in Ekuk near Bristol Bay and about 10 in the Kotzebue area. Alaska hares are distinct from snowshoe hares mainly because of their size. Jackrabbits are two to three times bigger than the snowshoe, according to Barger.

Bohemian waxwings are a wintertime fixture in Anchorage, darting in large flocks from one berry-filled tree to another.

By Seth Borenstein | The Associated Press FILE - A kayaker paddles in Lake Oroville as water levels remain low due to continuing drought conditions in

The dam altered the subsistence gathering patterns of the Tagish Kwan, the Daḵká Kwa’an and the Kwanlin Dün people. Residences, cabins and fish camps along the Whitehorse rapids were dismantled, gatherings at M’Clintock stopped, and many people dispersed to Fish Lake and Whitehorse.

Warm temperatures, melting sea ice, ocean debris and permafrost degradation dominated discussion of the 2021 NOAA Arctic Report Card.