Alaska
Q&A: What’s in the Water of Alaska’s Rusting Rivers, and What’s Climate Change Got to Do With it? – Inside Climate News
From our collaborating partner “Living on Earth,” public radio’s environmental news magazine, an interview by managing producer Jenni Doering with Jon O’Donnell, ecologist for the Arctic Inventory and Monitoring Network at the National Park Service.
The rapid climate change happening to our planet is often invisible.
Think of rising carbon dioxide levels in the atmosphere, or heat waves across the globe.
But in the far north of Alaska some changes are impossible not to see.
That’s because dozens of crystal-clear streams in the Brooks Range are turning a cloudy orange.
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A 2024 paper published in the Nature journal Communications: Earth and Environment connects the change to rapidly thawing permafrost that appears to be releasing metals like iron into these streams.
Lead author Jon O’Donnell is an ecologist for the Arctic Inventory and Monitoring Network at the National Park Service. This interview has been edited for length and clarity.
JENNI DOERING: So when did you first notice that the streams in Alaska’s Brooks Range looked rusty? And what was your reaction?

JON O’DONNELL: So we were monitoring a site in Kobach Valley National Park, on the Akillik River. And we had been collecting samples there, water samples and biological samples, like fish and bugs. That was in 2017. And when we went back in August of 2018, for a site visit, we noticed that the stream had turned orange. And this was surprising to us. And so you know, we were accessing this site in a small helicopter. And you know, my initial thoughts were, this is kind of an important thing to document. But I kind of thought it was maybe just anomalous, or a case study, where you know, this might just be a one-off thing, but it’d be a good story. So we should do a good job, collect all the samples that we need to collect. So we grabbed water samples, and we collected fish and bugs. And then, when we went back out in 2019, we were flying around the region, and we noticed that there were more streams than we had previously noticed, had turned orange. And that was kind of when I started to think that this might be a bigger issue than this anomalous one stream in Kobach valley, that it may be a bigger issue. And at that point, we started trying to compile observations from across the Brooks Range.
DOERING: So you mentioned that you did some water sampling. And you were finding these minerals in the water samples. What kinds of minerals have you been collecting?
O’DONNELL: Yeah, so we collect water samples from these orange streams, and then nearby clear water streams. And we measure the same suite of chemicals on all of them. So the orange in the stream, that is a reflection of iron. And so those are iron particulates, it makes the stream very turbid or filled with particles. And then those particles often get deposited on the stream bed, and so they blanket the rocks and the sediments in the bottom of the stream. But in addition to the iron, we see that these orange streams are more acidic, so they have a lower pH than, than clear water streams. And there’s a whole range of trace metals that are potentially toxic, both in terms of drinking water and for life that are living in these streams. And so examples of those trace metals that we’ve seen are like zinc and copper and arsenic and cadmium and a range of others that are elevated in concentration in the orange streams.
DOERING: So what do you think is going on here? What do we know about what might be causing this change in the streams and rivers?
O’DONNELL: All of our observations point towards climate and permafrost thaw as a driver of this change. The reasons for that are one, the timing. So we’ve documented over 70 streams and rivers that have changed in the very recent past here, so in the last 10, 10- 5 years. And this is a period of time where the climate has warmed dramatically in the Arctic. There’s also evidence that in these specific watersheds, the climate has warmed past the point where permafrost can stay cold and stay frozen. And so we know that permafrost is thawing in this region. And when permafrost thaws, that changes the hydrology of these watersheds. So you can imagine these mineral deposits being contained in what is essentially a freezer. And as the permafrost thaws, that’s kind of like shifting them to a refrigerator. And so now things can melt, ice can melt, water can flow. And so what we’re seeing is that we think groundwater is flowing through these soils and mineral deposits, where permafrost has thawed. And that is creating this chemical reaction that’s releasing all these metals and acid into the streams.
DOERING: Why are these metals and chemicals concerning? What effects could they have on wildlife and people in the area?
O’DONNELL: Right now we’re working to try to determine if these concentrations of metals have exceeded EPA, Environmental Protection Agency, thresholds for both aquatic life and for drinking water. And so we don’t have a definitive answer on that yet. At the concentrations, we know that this would affect taste of drinking water, so it might be more metallic. But one of our concerns is that these metals will be accumulated from the base of the foodweb through like algae and macroinvertebrates or bugs that live in the bed of the stream, up into fish, you know, similar to what people have shown with like mercury that can bio accumulate and magnify within a food web, and then it gets into fish and then into people if they eat the fish. So we’re concerned because these metals can be toxic both to the aquatic life, but into the people that might rely on the fish as part of their diet. And the stream where we were monitoring, and it changed from clear water to orange, when we first went there, and when it was a clear water stream, it had a really healthy fish population. So lots of small Dolly Varden. And these little resident fish, called slimy sculpin, there was just a lot of them. When we went back after the stream changed color, and it had turned orange, there were no fish. All the fish were gone. We did the exact same protocol for sampling, and the fish had disappeared. And the macroinvertebrate insects, the bugs that reside in the bed of the stream, their numbers declined dramatically with this change. So our thought probably is that the fish migrated out of this river to a better habitat. But there’s also a chance that they were impacted by this bio accumulation of metals up through the food web. And so this was just one instance, where we’ve measured this, we’re continuing our work now to try to figure out really, how are these fish being affected, but our initial thought is that the fish just left, the stream turned orange, and it was not a good habitat for them anymore.
DOERING: It’s amazing how rapidly these changes seem to have happened. I mean, it’s, you know, one year to the next, you notice these really rapid, significant changes, which is rare often when we’re studying what’s happening with climate change. How extensive is this issue in Alaska and beyond?
O’DONNELL: These observations that we have sort of span from the lower Noatak River Basin, in the West, all the way to the Arctic National Wildlife Refuge in the east. So it’s a you know, over 1000 kilometers. We’ve also been getting reports of observations from other areas in Alaska. So the North Slope, north of the Brooks Range, the Yukon River Basin to the south. So these are all watersheds and regions that are in permafrost zones. And so it’s possible that permafrost thaw is driving these observations elsewhere. There is some evidence in the literature for this kind of thing to be happening in non-permafrost regions, such as in the Alps, and in the Andes, in South America, where you have mountain glaciers, and when these glaciers melt, you expose minerals and rocks. And so similar process, except in these other regions, we’re talking about glaciers melting, as opposed to permafrost thawing.
DOERING: You know, this era that we’re living in is often called the Anthropocene, the age that’s shaped by humans. And it sounds like in this case, we’re changing geological processes. I mean, climate change is changing so many different geological processes, but it’s even changing the way that minerals are coming out of the soil.
O’DONNELL: Yeah, and I would say that the Arctic, because it’s so remote, and because of some of the unique features of the Arctic, it’s changing at a faster pace than other regions, like temperate and tropical regions and the globe as a whole. You know, I think the latest evidence shows that the Arctic is warming about four times faster than the Earth as a whole. And because of that, and because of the permafrost, and because of how much carbon and other things are stored in the soils up here, there’s potential for really rapid change, and really dramatic alteration of ecosystems up here that you don’t necessarily see in other parts of the planet. And so yes, the fact that there are these anthropogenic warming effects that are driving climate change in the Arctic and permafrost thaw, and ultimately, this release of mineral compounds, trace metals into streams, that’s a really unique set of factors that we wouldn’t necessarily have foreseen when thinking about climate change in the Arctic.
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DOERING: Jon, what is it like to be studying this and seeing these changes as a scientist?
O’DONNELL: Yeah, so I’ve been working in Alaska now for over 20 years. And I view my job as an ecologist, is basically to document the changes that are occurring. And I’ve worked on a number of different types of studies related to wildfire, permafrost thaw and carbon cycling, things like that in the Arctic. This is by far the most surprising set of observations that I’ve been a part of in my time up here. And I think that it is shocking in terms of how fast it’s happening and the spatial scale at which it’s happening. As somebody who has documented these changes for over 20 years, I’ve become somewhat used to or maybe desensitized from some of the more dramatic things going on. When I sent this paper to my parents who live on the east coast in Philadelphia, they responded by saying that they were depressed and saddened by what they were seeing. And because I’m so used to just functioning as a scientist, I maybe separate my emotional responses from some of these dramatic things that are happening up here. But talking to the public and talking to my family and friends, I’ve kind of been forced to realize that there’s this emotional response that people have to wilderness and to nature, and to places like national parks that people love to go and visit, and when they see them undergoing this sort of change, it’s upsetting.
Alaska
Former Alaska corrections officer sentenced to 150 years in prison for killing wife and teen daughter
A former Alaska corrections officer who pleaded guilty to the 2022 killings of his wife and daughter earlier this year was sentenced this week to 150 years in prison.
Anchorage Superior Court Judge Josie Garton on Tuesday sentenced Jalonni Blackshear to consecutive 75-year sentences for first- and second-degree murder in the 2022 killings of his wife, Raechyl Blackshear, and their 14-year-old daughter, Jayla, according to filings in the case.
The sentence came after Blackshear pleaded guilty to the charges in late January. Blackshear, in a plea agreement affidavit, said that he shot and killed his wife and daughter in their Scenic Foothills neighborhood home on April 4, 2022, amid a police investigation into suspicions that Blackshear had sexually abused his daughter.
The plea agreement called for a 150-year sentence, according to a May 11 sentencing memorandum signed by Assistant District Attorney Rachel Gernat.

Nearly a dozen other charges, including murder, sexual abuse of a minor and incest, were dismissed as part of the plea agreement with prosecutors, according to the memorandum.
Blackshear had a history of abusing and terrorizing his family, Gernat said in the memo. He shot his family members in the head to avoid prosecution on sexual abuse charges after he failed to coerce his daughter to recant statements given to Anchorage police about being sexually assaulted in late March of that year, she wrote.
In his plea agreement affidavit, Blackshear admitted that the murders were unprovoked and that he was likely to face charges for sexually abusing his daughter.
The mother and daughter were last seen on April 3, 2022, after Blackshear convinced his wife to take their daughter to Anchorage police to try to get her to retract her sexual assault allegations, prosecutors said.
Blackshear quit his job and fled Alaska several days later after he was charged with sexually abusing his daughter. Prosecutors said he used the mother and daughter’s phones to impersonate them in an effort to convince others they were alive.
Raechyl and Jayla Blackshear were found dead in the family home days later after Raechyl Blackshear missed a medical appointment, according to police. Tracking data from their phones led to Blackshear’s arrest in New York weeks later, according to prosecutors.
Blackshear was jailed at the Mat-Su Pretrial facility as of Thursday afternoon.
Alaska
Tomorrow Alaska Burns $190 Million Of Taxpayer Money To Drag Oil Companies Into The Arctic Refuge
There’s a place in the far northeast corner of Alaska that almost no American has ever seen and almost every American would tell you to protect. In June the sun never sets. The light is low and golden for twenty hours and soft and golden for the other four. The tundra goes electric green with cottongrass and dwarf willow and Arctic poppy. The Porcupine River runs cold and clear off the Brooks Range. And 143,000 caribou fan out across the coastal plain to give birth to their calves. They’ve been doing this for thousands of years. The herd walks 1,500 miles from interior Alaska and the Canadian Yukon to the same patch of tundra, every spring, to deliver the next generation onto the same ground their grandmothers were born on.
Right now, this week, the herd is on the plain. The calves are being born. Polar bear mothers, the sea ice failing them, have moved their dens onshore. Snow geese feed in the wetlands. Musk oxen, brought back from extinction in the 1930s, move in slow shaggy ranks across the high ground. More than two hundred bird species nest here every summer. Some flew in from Argentina. Some flew in from New Zealand. Some flew in from the edge of Antarctica. The Gwich’in people, who’ve shared this country with the Porcupine herd for thousands of years, call this place Iizhik Gwats’an Gwandaii Goodlit. The Sacred Place Where Life Begins.
Tomorrow morning at 10 a.m. Alaska time, in an office building in downtown Anchorage, the Bureau of Land Management will open sealed bids on the right to drill it. The only confirmed bidder is the State of Alaska itself, putting up $190 million in taxpayer money to drag oil companies into a refuge they’ve already refused to drill twice.
The only entity that has confirmed it will bid tomorrow is the Alaska Industrial Development and Export Authority. AIDEA is a state-owned Alaska corporation. Its money is Alaska taxpayer money. Three weeks ago, AIDEA’s board voted 6-1 to authorize $190 million for tomorrow’s bidding and the seismic exploration that would follow if it wins anything. That’s on top of the roughly $12 million in Alaska public money AIDEA already spent in 2021 buying refuge leases that have, five years later, produced zero barrels of oil, zero dollars in revenue, and a pile of pending litigation. AIDEA’s existing leases were canceled by the Biden administration, reinstated by a federal judge, and tied up in court ever since.
Let me explain what’s happening here, because the official press releases will not.
AIDEA wants the drilling. The Alaska political establishment has wanted the drilling for fifty years. Two prior federal lease sales on this same land asked whether private industry actually wanted to drill it, and private industry said no. The 2021 sale drew almost no major oil company bids. The 2025 sale drew zero bids of any kind. None. Exxon sat out. So did Chevron. So did Shell and ConocoPhillips. Every one of the six largest American banks refuses to finance Arctic Refuge drilling. Every major oil company has, on the record, in repeated lease sales, walked away.
So the Alaska political class is using state public money to bring the drillers in. AIDEA director Randy Ruaro told the Anchorage Daily News in May, “We’re absolutely interested.” His board voted to spend $190 million the next week. The lone no vote came from Andrew Guy, president of the Indigenous-owned Calista Corp., who said the agency hadn’t explained what the $190 million was actually for. The board went ahead anyway.
AIDEA’s bid serves a single purpose. The state’s development bank locks up acreage tomorrow so that an oil major can take a sublease later, when political weather changes or new federal infrastructure makes the project feasible. Call it what it is. A $190 million Alaska taxpayer downpayment on the destruction of the most pristine wildlife refuge in the country. Alaska is paying nearly a quarter of a billion dollars to make sure the drilling pipeline stays alive when the actual market has rejected it twice.
The Trump administration will call the result a successful sale tomorrow afternoon. The Alaska delegation will call it industry vindication. Alaska taxpayers will eat the $190 million. The federal government will pocket the bid money. The polar bears and the caribou will be one auction closer to gone.
When Congress opened the refuge to drilling in the 2017 Tax Cuts and Jobs Act, the Congressional Budget Office estimated the two mandated lease sales would generate $1.82 billion over ten years. Pro-drilling members of Congress sold the program as a $1 billion offset against the bill’s $1.9 trillion price tag. The actual federal take from the 2021 sale was $8.2 million. The take from the 2025 sale was zero.
When Congress passed the One Big Beautiful Bill Act last summer and mandated four more sales, CBO revised the revenue estimate down to $452 million across the entire ten-year window. Taxpayers for Common Sense, the nonpartisan watchdog that’s tracked this program for a decade, calls even that estimate wildly inflated. Their projection based on twenty years of actual North Slope bidding data is $3 to $30 million in total federal revenue across all four sales combined.
To translate that, 2017 voters were told the program would pay for itself. The actual pace at which the program is paying for itself is roughly the cost of an elevator retrofit on a single Senate office building. We’ve written before about the lie behind ‘unused’ public land and the math that doesn’t add up on public lands logging. This is the same con, run on the same talking points, for the same beneficiaries. The pattern repeats. The federal government promises billions in extractive revenue. Actual revenue arrives in the low millions. The land is ruined regardless.
The reason the math doesn’t work is structural. There are no roads on the coastal plain. The Trans-Alaska Pipeline stops a hundred and twenty miles to the west at Prudhoe Bay. The airstrips, the housing, the processing capacity that any commercial operation would require, all of it would have to be built from scratch, in a place where winter lasts nine months and the working window for surface infrastructure is measured in weeks. A new field in the Refuge would take seven to ten years to develop before the first barrel reached a refinery. Whatever crisis the Trump administration cites tomorrow to justify the sale will be eight years in the rearview by the time any oil moves.
Goldman Sachs ran these numbers in 2017 and called Arctic exploration economically unjustifiable. The market agreed twice. Tomorrow, Alaska public money will try to override the market.
The man running tomorrow’s sale is Doug Burgum, the former North Dakota governor that Trump confirmed as Interior Secretary in January 2025 with a mandate to maximize fossil fuel extraction from federal lands. Burgum’s previous job was running the third-largest oil-producing state in the country. The Associated Press, citing state records, reported that his administration coordinated with oil industry lobbyists on regulatory strategy while his own family was leasing land to oil companies.
In October 2025, Burgum reopened the entire 1.56-million-acre coastal plain to leasing. In December 2025, Trump signed six Congressional Review Act resolutions overturning BLM management plans that had protected the coastal plain along with five other major federal land units. The CRA carries a permanent bar against the agency issuing comparable protections without new congressional action. The same Interior Department also opened the entire Gulf of Mexico oil and gas program by convening the God Squad for the first time in thirty years to exempt the program from the Endangered Species Act. Over the heads of fifty-one Rice’s whales. Tomorrow’s auction is one move in a campaign.
The Gwich’in Steering Committee was unequivocal. “Secretary Burgum’s intentions to pilfer sacred land in the Arctic Refuge to the highest bidder flies in the face of the rights of the Gwich’in as Indigenous people and, quite frankly, in the face of common sense.” On April 28, Steering Committee Executive Director Kristen Moreland sent letters to eight major oil company executives formally requesting they decline to bid tomorrow. The day after, 13 conservation organizations sent a parallel letter to 11 oil executives reminding them of the reputational risk of bidding. As of this writing, none of those companies has publicly confirmed they will. None has publicly confirmed they won’t.
Look at the numbers, then think about what they mean.
The Porcupine caribou herd has dropped from 218,000 animals in 2017 to 143,000 in the most recent 2026 survey. A thirty-five percent decline in nine years. The coastal plain is their calving ground. The geographic reason there’s still a Porcupine herd at all.
The Southern Beaufort Sea polar bear population, the bears that den on the coastal plain, has dropped to a draft 2025 estimate of 819 bears. The 1980s estimate was upwards of 1,500. They’ve been listed as threatened under the Endangered Species Act since 2008, the law Doug Burgum’s Interior Department is currently dismantling through regulation. Three-quarters of the coastal plain is now their primary denning habitat, because sea ice denning is no longer viable. The mothers dig their dens in snowdrifts behind the dunes. They give birth in those dens in winter. The cubs are smaller than a softball when they’re born and weigh roughly a pound. They cannot be moved.
Seismic exploration uses 90,000-pound thumper trucks that pound the tundra in winter to map subsurface geology. The forward-looking infrared technology the oil industry uses to locate polar bear dens before driving over them has been documented missing more than half of known dens in field-tested conditions. When the technology misses a den, the truck drives over it. When the mother bear flees her den early, the cubs die.
Read that again. The technology misses more than half the time. When it misses, the cubs die. Tomorrow morning, Alaska is committing $190 million of public money to bring that equipment into the highest-density polar bear denning habitat in the United States. The hunters and anglers who love the Refuge know this as well as the scientists do. The same audience who saw the 1.4 million acres of the Dalton Corridor transferred to Alaska last month, severing the wildlife corridor between Gates of the Arctic, the Arctic Refuge, and two adjacent refuges. The same audience who watched 58 million acres of national forest get opened to industrial logging in March. The pattern is the pattern. The country we hand to our kids will have less of this in it every year we tolerate this.
Two full ANWR lease sales under the original 2017 Tax Cuts and Jobs Act mandate happened. Both flopped. CBO cut its revenue forecast in half. The banks won’t finance. The majors won’t bid. The Indigenous nation whose existence depends on the caribou opposes it. The polar bears are at a fraction of their historical numbers. The hunters and anglers who rely on those public lands are watching the access disappear. And the State of Alaska is throwing a quarter of a billion dollars in public money at the problem tomorrow to keep the political show alive.
Ninety-nine percent of one million public comments on the original program opposed drilling. Two-thirds of registered voters consistently oppose drilling in polling. The United Nations Committee on the Elimination of Racial Discrimination has sounded alarms three times about the human rights violations entailed in opening the calving grounds without Gwich’in consent. Multiple federal lawsuits are pending against the 2025 Record of Decision under the APA, the Wilderness Act, ANILCA, the Refuge Act, NEPA, the ESA, and the underlying statutory authorities. The Center for Biological Diversity and Defenders of Wildlife have served notice of intent to sue under the Endangered Species Act over polar bear impacts. The administration is conducting the sale anyway.
It’s a familiar pattern from this Interior Department. Move fast. Transfer the asset. Generate facts on the ground. Let the courts try to unwind them later. Once a lease sells, it encumbers the land for years. Active leases generate environmental reviews and seismic permits and road petitions and infrastructure proposals and an institutional momentum the courts struggle to undo even after they rule the underlying decisions unlawful. That’s the point of holding the sale anyway.
We Will Never Forgive or Forget Those Who Sell Our Public Lands is the name of a piece we ran last summer. It feels more applicable every week. Tomorrow morning, the State of Alaska is adding a $190 million line item to that ledger.
The U.S. House and Senate hold the keys here. The OBBBA mandate that compels tomorrow’s sale was written by Congress and signed by the president, and only Congress can rescind it. Find out how your senators and representative voted on every public lands measure of 2025 and 2026 in the Congressional Public Lands Scorecard. Call them. Tell them you want HR 3067, the Arctic Refuge Protection Act, advanced. Tell them you want the OBBBA Arctic Refuge mandate repealed. Tell them you noticed.
Tell them you noticed that the only confirmed bidder is using public money to bring oil companies to a place those companies don’t want to be.
Tell them you noticed the math has never worked.
Tell them you noticed what they’re selling, and you know we don’t get this one back.
Raise some hell,
Will
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Alaska
First Alaska mule deer harvest follows years of fleeting appearances in the state
When Westin Nelson of Skagway became the first Alaska hunter on record to harvest a mule deer, he may have been doing the state a favor.
Mule deer, better known as inhabitants of the Rocky Mountain and Great Plains regions, have been expanding their range northward, including into Alaska. As they do so, they are expanding the risks of parasites and some contagious diseases.
The most concerning issue is the winter tick, or Dermacentor albipictus. It has yet to be documented in Alaska, but it has wiped out much of the moose population in New England and started causing problems for moose populations as far north as Canada’s Yukon and Northwest Territories.
In recent years, nearly half of the mule deer examined in the Whitehorse area were found to be tick-infested, said Dr. Kimberlee Beckmen, the Alaska Department of Fish and Game’s wildlife biologist. That is ominous for Alaska, she said.
“All it takes is one mule deer with one female tick on it to come into Alaska, and that would completely devastate our moose population,” Beckmen said.
Mule deer have been well-established in the Yukon Territory since at least the 1980s, and in Alaska, people have been spotting them on sometimes fleeting occasions for a little over a decade.
Most sightings have been in the northern part of the Southeast Panhandle, but some were as far north as Interior Alaska. Three mule deer were reported in 2013 near Delta Junction, one was photographed near the Fort Knox mine outside of Fairbanks in 2016 and one was struck by a vehicle and killed in North Pole in 2017, according to the Department of Fish and Game.
Though they are related to the Sitka black-tailed deer that live in territory stretching from the British Columbia rainforest to the Kodiak Archipelago, mule deer are different from their Alaska cousins.
The contrast is striking, said Nelson, the Skagway hunter.
“These deer are big, maybe twice the size of Sitka black-tailed deer,” he said. “Mule deer have enormous ears. They have ears like a mule.”
Adult Sitka black-tailed deer generally weigh 80 to 120 pounds, according to the Department of Fish and Game, while adult mule deer often weigh more than 200 pounds.
Nelson said he has seen mule deer occasionally in the Skagway area over the past few years. He had a light-hearted competition with a friend about who would be the first to hunt one. It was not until April when circumstances came together to result in a successful hunt — right in that friend’s yard.
“I just happened to kind of get lucky,” Nelson said.
The rules for hunting mule deer in Alaska, where the species is non-native and considered “deleterious,” are liberal. There are no seasonal restrictions and no bag limits. Even though it took until this year for Nelson to become the first hunter on record to harvest a mule deer in Alaska, state officials first authorized mule deer hunting in 2019.
The caveat for mule deer hunters is that the Department of Fish and Game wants them to submit tissue samples for testing. That is to screen for signs of tick infestations and for numerous problems like brain worm, also known as “moose sickness,” chronic wasting disease, different types of hemorrhagic diseases, bluetongue, worm infestation and other diseases or parasites.
Nelson provided abundant samples to the department: the hide, head and neck, liver, heart, lungs, spleen, lower colon and two lower legs with the hooves attached, according to officials with the Department of Fish and Game.
Importantly, Beckmen with the department said, there were no signs of hair loss or breakage in the hide, indicating that any tick infestation during the past winter was unlikely.
Nelson said he has been reading up on mule deer and the state’s concerns about ticks and other dangers. But he downplayed any contributions he might have made to state wildlife safety. “I wouldn’t say I’m super-noble or anything. I just wanted to get one,” he said.
Climate change, along with factors like road-building and agricultural development, have allowed mule deer to thrive in new territory even as some habitat is lost to development, according to the Department of Fish and Game.
Climate change is also helping spread the winter tick northward and westward.
The ticks do not travel on their own. Rather, they grow from eggs that are laid on the ground in the spring that grow into larvae that climb up plants in packs to latch onto passing hosts in the fall, a process known as “questing.” If they stay attached all winter, they develop into adults that repeat the cycle by dropping from their hosts in spring to lay eggs. Shorter winters and later snowfalls are increasing opportunities for successful questing by the ticks, scientists say.
In New England, moose have been found with tens of thousands of winter ticks embedded in their skin. The blood loss they cause can be fatal, especially to young moose. In Maine, for example, biologists in 2022 found that 86% of the moose calves they had collared died from tick infestations. In New Hampshire, the moose population now is only about half of what it was in the 1990s, according to state biologists there.
While mule deer can become infested with winter ticks, they also are able to get rid of them fairly effectively through self-grooming.
Moose lack those grooming skills. That results in moose rubbing and scratching off so much of their hair that they are called “ghost moose” because their bald spots make them look white.
Mule deer are not the only species expanding their range to Alaska.
Another such species is the mountain lion, also known as cougar. The Alaska Board of Game early this year approved a first hunting and trapping season for mountain lions. It is set to start on Aug. 1 in parts of Southeast Alaska.
Originally published by the Alaska Beacon, an independent, nonpartisan news organization that covers Alaska state government.
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