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Traces of some pesticides that were likely never used in Alaska have been showing up in fish tested in the state's national parks, according to a new study. And they appear to be arriving in some roundabout ways.

Yereth Rosen
A species of bird now flying north to summer breeding grounds in the boreal forests of Alaska and Canada has fallen on hard times, and biologists are asking the public to help figure out why.Yereth Rosen
The Southeast Alaska dive team consists of 24 divers, a mix of commercial fisheries area management biologists, assistant area biologists, herring and shellfish research biologists, and a few biologists from other divisions.Scott Walker
Crews from Alaska's coastal Arctic communities have begun the spring hunt. But more new ice than usual in the past few years serves as a reminder to the crews of the dangers involved.Jillian Rogers
The areas coveted as sea routes for commercial shippers seeking to exploit increasingly ice-free Arctic waters are the same areas that are vital to millions of seabirds that flock north each summer to feast under the midnight sun, says a newly published study.Yereth Rosen
The end could be near for the High Frequency Active Auroral Research Program near Glennallen unless the Air Force finds an organization to run the facility. The Geophysical Institute at the University of Alaska Fairbanks hopes to put together a plan to take on the task.Dermot Cole
A few miles from the Arctic Circle on the United States' only Arctic highway, there’s a sloped area notorious for a series of dips and buckles  caused by seasonal thaw and subsurface meltwater. The "frost boils" of Beaver Slide may have met their match.Yereth Rosen
While the Department of Environmental Conservation commissioner says his staff didn't do enough to explain its tough cleanup standard on sulfolane outside the North Pole refinery, the Division of Spill Response and Prevention presented detailed backup material in February.Dermot Cole
As permafrost thaws, it changes the composition of vegetation in the Arctic. This could accelerate global warming, say scientists.Sudeshna Chowdhury
Alaska's polar, brown and black bears are the descendants of common ancestors that first began to split off into different species more than a million years ago, says a new study. Another study suggests one isolated population of brown bears may be more related to polar bears than to other brown bears.Yereth Rosen