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Bering Sea heat wave cited as trigger for nosedive in Yukon River chinook salmon

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Bering Sea heat wave cited as trigger for nosedive in Yukon River chinook salmon


Spawning chinook, or king, salmon. (Ryan Hagerty / U.S. Fish and Wildlife Service)

The intense marine heat wave conditions that began roiling the Bering Sea in about 2016 resulted in the lowest winter sea ice extent measured in 150 years, widespread bird and marine mammal die-offs, a drastic shift in fish populations and a crash of snow crab stocks.

Now new research is tying the marine heat wave to the recent collapse of Yukon River chinook salmon.

A study published in April, written by scientists at the National Oceanic and Atmospheric Administration’s Alaska Fisheries Science Center and University of Alaska Fairbanks, showed the correlation between the extreme heat wave conditions and the nosedive in Yukon River chinook stocks. The heat wave was accompanied by a dramatic increase in deaths of older juvenile and adult chinook that, had they survived, would have returned from the ocean to freshwater spawning grounds, the study found.

The study was published in the journal Ecological Applications.

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The Yukon River’s runs of chinook, also called king salmon, have been in a long-term decline since their past heyday, when they numbered in the hundreds of thousands and the river was one of the biggest sources of that salmon species.

The sharp downturn in recent years resulted in a 2022 return that was the lowest on record. Widespread fishery closures have been in effect for years along the Yukon River system in both Alaska and Canada.

The study evaluated four general reasons for the sharp decline: poor juvenile “recruitment” into the ocean, which refers to the successful migration of surviving juvenile fish from freshwater; deaths of fish in the marine environment at the start of their migration back to freshwater; harvests that target the salmon; and bycatch, the unintentional harvest of salmon by commercial fishing vessels targeting other species, such as pollock.

Poor juvenile recruitment emerged as an important factor, which was to be expected, the study said.

“Not surprisingly, we found evidence to suggest that impacts operating in the early life stages have likely contributed to declines in run sizes over the past two decades, which is consistent with previous research,” NOAA Fisheries researcher Lukas DeFilippo, the lead author, said in a statement.

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Mortality of post-juvenile Yukon River chinook salmon increased dramatically as Bering Sea temperatures did. Panel A shows the number of days characterized by marine heat wave conditions for the Northern and Southeastern Bering Sea and the annual average sea surface temperature from 2003 to 2023. Panel B shows estimates of post-juvenile natural mortality with dashed vertical red lines marking the 2016-2020 heat wave period. (Graph provided by NOAA Fisheries)

But the information about spiking mortality among adults and older juveniles was new, the NOAA scientists said. That new trend represents “an apparent shift in the critical life history stages and processes” for Yukon River chinook, and a potential bottleneck limiting population recovery, the study said.

Exactly how the heat wave conditions caused deaths of salmon at sea is yet to be determined, the study said. It listed several factors that could have worked in combination, including lack of suitable prey, infections by the parasite Ichthyophonus and other diseases, as well as increased energy demands brought on by warmer temperatures.

Harvests, either intentional or as bycatch, did not emerge as important factors in the recent Yukon chinook declines, the study found.

The study contained some warnings.

Even though the marine heat wave conditions have eased, the abundance of prey that salmon need in the ocean has not returned to normal, it noted. And mortality rates in those later life stages continue to be higher than they were prior to the latest heat wave.

And the heat problems for older salmon are likely to become more common in years to come, the study said.

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“Given that marine heatwaves are expected to become more frequent and severe with continued warming . . . similar rises in mortality—and concomitant limitation of productivity and recovery potential—as described here could become increasingly common in the future,” the study said.

An earlier study by NOAA Fisheries and the Alaska Department of Fish and Game tied successive heatwaves in both the Bering Sea and Gulf of Alaska to sharp declines in chum salmon stocks. That 2023 study also pointed to higher mortality out in the ocean.

Originally published by the Alaska Beacon, an independent, nonpartisan news organization that covers Alaska state government.





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No credible threat found after Alaska Airlines flight reports

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No credible threat found after Alaska Airlines flight reports



An Alaska Airlines flight preparing to depart Miami International Airport for Seattle reported a disturbance involving threats from customers Sunday evening, according to air traffic control audio. Miami-Dade Sheriff’s Office Airport District deputies responded to one of the gates at Miami International Airport.

 Out of an abundance of caution, passengers were temporarily deplaned while deputies investigated the incident.

The investigation determined there was no credible threat, according to Miami-Dade Sheriff’s Office.

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The two individuals involved were rebooked on another flight. The aircraft was cleared, passengers were permitted to reboard, and the flight continued without further incident.

The incident happened aboard Alaska Airlines Flight 305.

In audio of communications between the aircraft and ground control, a pilot can be heard telling controllers that the plane had stopped and its parking brake had been set because of a “customer disturbance.”

“We have a customer disturbance on board right now with threats coming from customers,” the pilot said in the recording. “We want to go into a lockdown protocol.”

The pilot also told controllers the aircraft’s engine was being shut down.

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A post from ATCapp, an air traffic control tracking service that published audio of the incident, reported that multiple passengers had allegedly threatened flight attendants and that the aircraft was returning to the gate to meet law enforcement. 

CBS News Miami has not independently confirmed the circumstances surrounding the reported threats.

This is a developing story. Check back for updates. 



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In Alaska’s crowded race for governor, candidates struggle to stand out as primary nears

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In Alaska’s crowded race for governor, candidates struggle to stand out as primary nears


Nine candidates for governor are introduced at the start of a forum hosted by the Soldotna Chamber of Commerce on Thursday, Aug. 6, at the Soldotna Sports Complex. (Marc Lester / ADN)

SOLDOTNA — In a crowded field of 17 candidates, how are Alaska voters going to pick their favorite in the governor’s race primary?

It’s a question confronting not only voters but also the candidates themselves, as they scramble for enough support to make the top four and advance to the November general election.

“I’ve never encountered anything like this where there are this many people, and quite frankly, many of us have similar ideas. So when you think about what’s the distinction, not only is the public having difficulty breaking through — so are the candidates,” said former state lawmaker Lesil McGuire, one of a dozen Republicans in the race.

Under Alaska’s open primary system, all candidates appear on the same ballot this month. The top four vote-getters, regardless of party, will advance to the general election. With days remaining until the Aug. 18 primary day, candidates are zigzagging across the state and spending hundreds of thousands of dollars in an effort to secure a spot.

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Getting their names out there was the goal for nine candidates who trekked to Soldotna on Thursday evening — 12 days before the primary — to participate in a forum dubbed “Narrowing the Field.”

Audience members listen to the first round of the forum hosted by the Soldotna Chamber of Commerce on Thursday, Aug. 6, at the Soldotna Sports Complex. (Marc Lester / ADN)

Some in the audience of roughly 150 were not shy about declaring their support for one candidate or another with shirts, buttons or hats. Others said they came that evening because they could not make up their minds.

Barbara Blakeley, from Sterling, said at the beginning of the event that she supports former Anchorage Mayor Dave Bronson, but is also considering voting for former state Sen. Shelley Hughes, podiatrist Matt Heilala or former Revenue Commissioner Adam Crum. Asked at the event’s conclusion whether the forum helped her decide, she exclaimed “no” with mock frustration.

“It just made me like them all more,” Blakeley said.

Tiffany and Jacob Holt, Soldotna residents, said they came to the event with an open mind and an interest in hearing directly from the candidates themselves.

“The political ads are doing nothing for me,” said Jacob Holt.

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Tiffany Holt and Nettie Keller, both of Soldotna, prepare to drop their votes in a bucket after the first round of the forum hosted by the Soldotna Chamber of Commerce. (Marc Lester / ADN)

After the forum ended, they said they were still undecided.

Republicans, Democrats and independents are competing not just against candidates from their own party, but against the entire field. That creates unusual incentives: Candidates have reason to distinguish themselves, but also to avoid alienating voters who might otherwise support them as a second choice in November.

The crowded field also makes money less useful as a way to distinguish one candidate from another. Numerous candidates are well-funded and have the capacity to draw on their own wealth — or Outside donors — to match their opponents’ spending.

“You’d normally have a lot of candidates, but you don’t have 12 active campaigns with people actively working. Normally you get a handful of four or five viable — at most — but on this one you’ve got a broad range of people either with financial support or with name recognition, and we’re all really trying,” said Crum, another Republican in contention.

Current Gov. Mike Dunleavy is termed out from seeking reelection after eight years in office, leaving the race wide open and with no clear front-runner. The parties themselves have done little to narrow the field so far.

“Had we been down to four Republicans in this race … we’d be in far better shape,” said Bronson, who entered the race last year, adding that he wished the Alaska Republican Party “had come in and got all these lesser candidates that were polling low single digits out.”

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Candidates for governor, from left, Dave Bronson, Edna DeVries and Lesil McGuire talk as participants in the Soldotna forum assemble. (Marc Lester / ADN)

Without such consolidation, Bronson and other Republicans risk splitting the vote in the pick-one primary among candidates with overlapping bases of support.

Recent polling has shown several of the leading candidates separated by only a few percentage points, creating the possibility of an upset in the final days as voters make up their minds. Alaska has seen its share of razor-thin elections, including races decided by a dozen votes or fewer.

Without a clear front-runner, “name recognition is big,” said Bronson. “People have just not been paying attention. We go and talk to these groups and they go, ‘You’re running for what, again?’”

Lynn and Jack Hinds discuss their options after the Soldotna gubernatorial candidate forum’s first round. (Marc Lester / ADN)

The Democrats

The race for governor includes two Democrats — former state lawmakers Tom Begich, who represented downtown Anchorage in the Senate, and Jonathan Kreiss-Tomkins, who represented Sitka and other Southeast communities in the House.

That creates an unusual possibility: Democrats could conceivably put two candidates into the four-way general election, even as Republicans divide their votes among a dozen candidates.

On topics ranging from education funding to taxation, their views are largely aligned. Both say they plan to increase funding for public schools, protect Medicaid access and update Alaska’s oil and gas taxes.

Their biggest differences are less about policy than about political profile and strategy. Begich, 65, was the first Democrat in the field and has polled consistently ahead, in large part thanks to his membership in a well-known Alaska political family. His campaign is funded primarily by two wealthy Alaska donors.

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“Tom’s name ID is like, 95%,” said Kreiss-Tomkins. “He’s had the best name ID of any candidate the entire time, I think, which is a reason why he’s led in so many polls for so long.”

Tom Begich listens as his running mate, Julia Hnilicka, responds to a question during the Commonwealth North Gubernatorial Candidate Meet & Greet event at Wildbirch Hotel in Anchorage on July 20. (Marc Lester / ADN)
Jonathan Kreiss-Tomkins answers a question at his table during the Commonwealth North Gubernatorial Candidate Meet & Greet event at Wildbirch Hotel in Anchorage on July 20. (Marc Lester / ADN)

Kreiss-Tomkins, 37, is counting on his relative youth, along with ads cut by high-powered political consultants in Alaska and the Lower 48, to make the case that he is more likely to become the state’s first Democratic governor since the end of Tony Knowles’ tenure more than two decades ago. Knowles himself has endorsed Kreiss-Tomkins.

Kreiss-Tomkins’ campaign is funded primarily by contributions from Outside, including sizable sums from employees of a California AI company — drawing criticism and scrutiny from left-leaning voters, which could prove pivotal in a primary that tends to draw a more partisan electorate.

But things can change dramatically in the final days before the primary, as candidates spend their cash reserves on advertising, said Kreiss-Tomkins, the top fundraiser in the field.

“I think there’s going to be a lot of dynamism in these final couple of weeks because other candidates, myself included, are getting better known, and that’s kind of when the race really happens,” he said.

Some Democratic voters have said they would like to see just one of the two Democrats advance to the general election. With the GOP votes spread thin, it is not out of the question that both Begich and Kreiss-Tomkins could be one of the top four finishers, giving Alaskans two Democratic options in the general election. Neither candidate has publicly committed to dropping out in such a scenario — a move that would elevate the fifth-place finisher onto the ballot.

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Republican candidate Shelley Hughes talks with people after the conclusion of the gubernatorial candidate forum in Soldotna on Thursday, Aug. 6. (Marc Lester / ADN)

The Republicans

On the Republican side, several polls have shown that Bronson and Anchorage businesswoman Bernadette Wilson are leading the field. But they are far from the only candidates who can appeal to Republican voters.

“I don’t know of any real difference between Shelley and I or Treg or even Bernadette,” said Bronson, referring to former state Sen. Shelley Hughes, former Attorney General Treg Taylor and Wilson. The GOP field also includes Crum, Matanuska-Susitna Borough Mayor Edna DeVries and former Labor Commissioner and state legislator Click Bishop, who is supported by labor organizations across the state.

Bernadette Wilson responds to a question during the Commonwealth North Gubernatorial Candidate Meet & Greet event at Wildbirch Hotel in Anchorage on July 20. (Marc Lester / ADN)
Click Bishop listens during the Commonwealth North Gubernatorial Candidate Meet & Greet event at Wildbirch Hotel in Anchorage on July 20. (Marc Lester / ADN)

Several Republicans have emphasized their support for President Donald Trump and his efforts to boost natural resource development in Alaska. But with multiple candidates making similar appeals to conservative voters, even strong Republican credentials may not be enough to distinguish one candidate from another.

The candidates have largely refrained from publicly criticizing one another over ideology or style. That has led to a series of forums and debates in which candidates are far more likely to explain why they agree with one another than lob attacks.

“One of the best parts is the civil discourse that we have, which I think has been uplifting, as opposed to the tearing down,” Crum said.

Matt Heilala talks with fellow candidates for governor before a forum hosted by the Soldotna Chamber of Commerce starts Thursday, Aug. 6. (Marc Lester / ADN)
Joe and Billie Hardy listen to candidate responses at the Soldotna forum. (Marc Lester / ADN)

The approach contrasts with the 2022 U.S. House race, when two Republicans — former Gov. Sarah Palin and Nick Begich — spent much of the campaign attacking each other, helping Democrat Mary Peltola emerge victorious.

Hoping to consolidate the GOP vote, Wilson promised nearly a year ago that she would drop out of the race after the primary if she is not the top Republican vote-getter. She urged other Republicans to make similar commitments. But at the Soldotna forum Thursday, numerous Republican candidates refused to do so.

“With this system, it actually does make more sense for more conservatives to stay in it because you actually work together,” Crum said.

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Candidates are informed which five advanced to the second half of the gubernatorial forum in Soldotna. (Marc Lester / ADN)

The independents

The only candidate in the governor’s race who has previously held the job is Bill Walker, who held the post between 2014 and 2018. He was the last independent to serve as governor of any state.

Walker entered the race as a last-minute decision, mere hours before the deadline. He said that the other candidates were not spending enough time discussing the types of unpopular topics he wanted to hear about, like the need to change the Permanent Fund dividend structure and overhaul the state’s revenue system.

The results of the primary will “depend on who shows up,” Walker said.

Bill Walker, former Alaska governor, talks outside the Soldotna Sports Complex before the forum starts. (Marc Lester / ADN)

Nearly two-thirds of Alaska’s registered voters are nonpartisan or undeclared, up from just over 52% a decade ago. That represents a potentially large pool of voters for independent candidates — but only if they turn out.

At the Soldotna forum, where many audience members were registered Republicans, Walker received little attention.

“The partisan people — they’re used to showing up at a primary,” said Walker. “In an open primary, we’ll see if the nonpartisans show up. That can make all the difference in the world.”

Meda DeWitt answers a question in the Soldotna forum’s first round. (Marc Lester / ADN)

Meda DeWitt, another independent in the race who many know for her role leading a 2019 effort to recall Dunleavy, said she’s been left out of polling and counted out of discussions despite the appeal of her nonpartisan approach. That has made gauging her own standing “like reading tea leaves,” she said.

The partisan candidates “have to sort themselves out,” DeWitt told the Soldotna audience during the forum. As an independent, she said she can get crossover support from voters who would otherwise pick either a Republican or a Democrat.

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At the conclusion of the forum, audience members voted on their favorite candidate of the evening.

Jill Schaefer, a Soldotna Chamber board member, helps collect votes at the end of the candidate forum. (Marc Lester / ADN)
Adam Crum pumps his fist after his name was announced as the candidate with the most votes at the conclusion of the Soldotna forum. (Marc Lester / ADN)

Nick Sorrell, a KSRM radio host who helped organize the event, said that out of 126 votes tallied, Crum won with 46 votes, Hughes came in second with 31 votes and Bronson came in third with 24 votes.

The result was hardly a scientific measure of the statewide race. But for Crum, it offered a glimpse of the strategy required to survive a primary where the goal is not necessarily to pull ahead — just to finish fourth or better.

“It’s a weird strategy. This is a math thing,” he said.





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Opinion: Alaska owes its firefighters more than an impossible burden of proof

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Opinion: Alaska owes its firefighters more than an impossible burden of proof


Anchorage firefighters respond to a fire in a large commercial building in the area of 501 West Potter Drive on March 1, 2025. (Marc Lester / ADN)

For decades, firefighters across Alaska have run toward danger to protect the rest of us. Somewhere along the way, many of them were exposed to a danger nobody warned them about: aqueous film-forming foam, or AFFF.

This foam has been the standard tool for putting out flammable liquid fires — the kind found at airports, fuel depots and military installations across the state. It also contains PFAS, the so-called “forever chemicals” that have been associated with an increased risk of several cancers, including testicular, kidney, thyroid and liver cancer, along with reproductive and developmental issues and immune system dysfunction. Firefighters who go on to develop a PFAS-related cancer now face a second fight: a legal one that requires documentation nobody ever told them to keep.

Alaska is home to 155 fire departments and several military installations, such as Joint Base Elmendorf-Richardson, Eielson Air Force Base and Fort Wainwright. The Alaska Department of Environmental Conservation has identified PFAS contamination above cleanup levels tied to AFFF releases at locations throughout Alaska — firefighter training sites, foam storage tanks and transport lines, accident and emergency response sites and facilities such as aircraft hangars equipped with AFFF suppression systems.

For a retired Alaska firefighter facing a new cancer diagnosis, the last thing on their mind is likely whether they kept the right paperwork decades ago. Yet that paperwork is exactly what the legal system now asks them to produce if they want to seek compensation for their illness.

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The nationwide AFFF multidistrict litigation, MDL 2873, centralized in South Carolina federal court, is among the largest product liability proceedings in the country, with roughly 15,000 pending claims and nearly 20,000 filed since the litigation began — some of them likely filed by Alaskans. Despite those numbers, filing a claim is far harder than it sounds because the process demands proof of exactly how, when, where and why AFFF exposure occurred. That means gathering deployment and procurement records tied to AFFF use — records many firefighters were never given access to in the first place.

The burden of proving exposure falls on the individual, even though some of the records now being requested were never logged to begin with. Nobody tracked AFFF exposure carefully because nobody knew at the time that it would ever need to be proven.

The records that do exist were never built with this purpose in mind. Incident reports focused on operational details — what happened at a call, not what a firefighter was exposed to while fighting it. Medical records rarely captured AFFF exposure history because screening for it was never part of routine care. Cancer diagnosis registries document the disease itself, not the years of foam exposure that may have led to it.

None of this means the door is closed. Alaska firefighters may still be able to reconstruct a history of AFFF exposure well after the fact. That record-building typically starts with employment history, training records, incident reports and union records, paired with detailed medical documentation of the diagnosis itself. Piece by piece, those materials can rebuild what was never written down as “exposure” at the time it happened.

Firefighters who spent careers protecting Alaska communities and who developed cancer in the process deserve support and a fair shot at that record — not a second, quieter fight against a filing cabinet.

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Jordan Cade is an environmental injury attorney working with the Environmental Litigation Group P.C., an Alabama-based firm. He has extensive experience helping firefighters file toxic-exposure claims.

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The Anchorage Daily News welcomes a broad range of viewpoints. To submit a piece for consideration, email commentary(at)adn.com. Send submissions shorter than 200 words to letters@adn.com or click here to submit via any web browser. Read our full guidelines for letters and commentaries here.





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