Melted sea ice in the Arctic Ocean has paved the way for killer whales to spend more time in these waters, but researchers worry that this could threaten species of prey in these areas, potentially throwing the ecosystem off balance.
Researchers from the University of Washington tracked the movement of aquatic species off the western and northern coasts of Alaska using underwater microphones between 2012 and 2019. They presented their findings at a conference held by the Acoustical Society of America on Thursday.
The researchers hadn't initially intended to focus on killer whales, but were surprised when they noticed that more and more orcas were moving into these waters.
“Our work mostly centres on examining the migration patterns of species through the Bering, Chukchi and Beaufort seas, based on acoustic presence or absence," lead author Brynn Kimber said in a news release.
"But when looking for other species, like beluga whales, I noticed more and more killer whales in areas where I didn’t expect them. That was what motivated me to take a closer look at our killer whale detections.”
Killer whales had normally stayed away from these waters to avoid ice entrapment -- which occurs when ice blocks the whales from coming up to the surface to breathe -- but the effects of climate change are causing the sea to be ice-free for longer periods.
“It’s not necessarily that killer whales haven’t been reported in these areas before, but that they appear to be remaining in the area for longer periods of time,” said Kimber. “This is likely in response to a longer open-water season.”
Kimber added that the September sea ice in the Arctic Ocean has declined at an average rate of 13 per cent per decade since the 1980s.
Several species of prey, such as the endangered bowhead whale, have taken advantage of the sea ice to avoid predation by killer whales, but the declining sea ice has offered the orcas a new abundant source of food, which could put these species of prey at risk.
"These results speak to a changing Arctic, both in terms of the presence of killer whales themselves and in terms of the impact that increased killer whale predation could have on Arctic food webs," the authors wrote.
Without having seen it, former Bank of Canada governor David Dodge believes that Tuesday's 2024 federal budget from Deputy Prime Minister and Finance Minister Chrystia Freeland is 'likely to be the worst budget' in decades.
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A controversial former school trustee from B.C.'s Fraser Valley who described a political rival as a "strip-tease artist" during an election campaign has been ordered to pay her $45,000 for defamation.
Michael Gordon Jackson, the man on trial after being charged with contravention of a custody order for allegedly abducting his daughter in late 2021 to prevent her from getting a COVID-19 vaccine, called himself to the stand Monday.
Following the Iranian missile and drone strikes against Israel over the weekend, Canada should take the threat of Iran and potential escalation of the conflict seriously, one global affairs analyst says.
A couple who owned a Colorado funeral home where authorities last year discovered 190 decaying bodies were indicted on federal charges that they misspent nearly US$900,000 in pandemic relief funds on vacations, cosmetic surgery, jewelry and other personal expenses, according to court documents unsealed Monday.
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The historic hush-money trial of Donald Trump got underway Monday with the arduous process of selecting a jury to hear the case charging the former U.S. president with falsifying business records in order to stifle stories about his sex life.
The U.S. Supreme Court on Monday let a Republican-backed law in Idaho that criminalizes gender-affirming care for transgender minors broadly take effect after a federal judge blocked it as unconstitutional.
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Deputy Prime Minister and Finance Minister Chrystia Freeland will be presenting the 2024 federal budget on Tuesday, revealing how the federal Liberal government intends to balance the nearly $40 billion in pre-announced new spending with her vow to remain fiscally prudent.
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It’s common knowledge that exercise is good for your mental health and your heart health — and now a new study suggests that all three are working together.
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NASA confirmed Monday that a mystery object that crashed through the roof of a Florida home last month was a chunk of space junk from equipment discarded at the International Space Station.
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Dyson Knight may look like an average college student, but since 2004, he’s actually been a member of the internationally acclaimed Baha Men.
Canadian singer Grimes apologized to fans on Saturday after her Coachella set earlier that evening was beset by technical issues that caused her to scream into the microphone in frustration.
A movie weapons supervisor was sentenced to 18 months in prison in the fatal shooting of a cinematographer by Alec Baldwin on the set of 'Rust.'
A Vancouver woman whose company duped investors by promising big returns on real-estate deals that would house the homeless has been ordered to pay nearly $626,000 after the British Columbia Securities Commission deemed the operation a Ponzi scheme.
The U.S. Department of Justice is preparing to file an antitrust lawsuit against Live Nation as soon as next month, the Wall Street Journal reported on Monday, citing people familiar with the matter.
Apple's smartphone sales tumbled 10 per cent last quarter, according to market research firm IDC, as sales in China fell sharply.
A high score on a Foo Fighters pinball machine has Edmonton player Dave Formenti on a high.
Celebrity food critic Keith Lee said he was blown away by Toronto, handing a rich ranking to its culinary creators, as the first international stop of his latest food tour.
Even as the cost of living goes up, there are still ways to save some cash when out shopping or using credit cards.
After four years at the University of Connecticut, Edwards was selected sixth overall by the Washington Mystics in the WNBA draft Monday night.
The Indiana Fever selected sharpshooter Caitlin Clark with the first pick of the WNBA Draft on Monday.
The NBA broke all-time regular-season records for total attendance, average attendance and sellouts for the second straight year in 2023-24.
Tesla will lay off more than 10 per cent of its global workforce, an internal memo seen by Reuters on Monday shows, as it grapples with falling sales amid an intensifying price war for electric vehicles.
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While many people choose to keep their medical appointments private, four longtime friends decided to undergo vasectomies as a group in B.C.'s Lower Mainland.
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If you’ve ever felt the allure of Hollywood and wanted to be in a big-budget movie your time to shine is now.
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Michael Gordon Jackson, the man on trial after being charged with contravention of a custody order for allegedly abducting his daughter in late 2021 to prevent her from getting a COVID-19 vaccine, called himself to the stand Monday.
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Cambridge resident Samantha Falkiner explains why something felt "off" about the men who approached her and her neighbours on Friday.
Police are searching a residence just east of downtown Guelph after a man went to hospital with injuries from a homemade explosive device.
Wellington County OPP is currently investigating a double fatal collision near Drayton.
Friends are raising money for the grieving family of a 16-year-old Saskatoon boy who was killed in a high-speed crash that injured two other teens on Sunday morning.
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The Thunder Bay police chief is acknowledging some residents' eroding trust in the service as his predecessor and other high-ranking members of the force face criminal charges.
A motion going to city council Tuesday could be the first step in approving a pilot project that would approve bus passes for students in grade nine at Clarke Road Secondary school.
Multiple warnings have been issued about the dangers of coyotes and potential wild dogs following a weekend attack that left one person seriously injured.
When Westdell Development acquired White Oaks Mall last year, President Iyman Meddoui said they always had the vision of adding additional commercial and residential components.
It's been more than two years since Jim Lynne died in a crash along Mosley Street in Wasaga Beach.
A street sign in Barrie, renamed to honour 11-year-old Chase McEachern's legacy after he died in 2006, has gone missing again from an alleyway at the heart of the city's waterfront.
The residents of Kashechewan First Nation are in a race against time, preparing for a mass evacuation as the relentless threat of flooding from the Albany River looms closer.
Windsor police are looking for a woman after a parcel was taken from a home in the 400 block of Chilver Road.
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A new ranking by food delivery platform Uber Eats puts Windsor among the top cities in the province for ordering cannabis.
The family of a Victoria, B.C., woman who was seriously injured in an accident in Thailand is pleading for help as medical bills pile up.
A Vancouver woman whose company duped investors by promising big returns on real-estate deals that would house the homeless has been ordered to pay nearly $626,000 after the British Columbia Securities Commission deemed the operation a Ponzi scheme.
The HMCS Max Bernays made its way into its new home at CFB Esquimalt on Monday after a long journey from Halifax.
British Columbia is planning to add 240 new units to its complex-care housing program, providing homes for people with mental-health and addictions challenges that overlap with other serious conditions.
More than 80 residents from a low-income apartment building in Kelowna, B.C., have learned they won't be able to return to their homes for at least another two weeks.
Mounties are investigating a reported "road rage" incident in Kelowna, B.C., that left two men injured last week.
Lethbridge West MLA Shannon Phillips is calling on the province to reinstate funding for the Lethbridge Elder Abuse Response Network.
If you’re planning to head to the coulees this weekend to enjoy the nice weather, don’t forget to look down.
With the weather starting to feel like spring is really here, more kids will likely be outside enjoying the sunshine and warm temperatures, which organizers of the Slow Your Roll campaign say is a perfect time to re-launch the campaign.
The City of Sault Ste. Marie is expecting a busy summer at the Downtown Plaza. City officials say the plaza is coming off a successful first winter season, which saw large crowds gathering at the outdoor rink.
The Soo Greyhounds are the talk of the town, as their second-round matchup in the OHL playoffs touches down in the Sault.
Thunder Bay Police Service held a news conference Monday afternoon to discuss the misconduct investigation that led to criminal charges being laid against the city's former police chief.
A pricing agreement has been reached between crab fishers and seafood processors that will allow for Newfoundland and Labrador's annual crab fishery to get started.
Longliners across Newfoundland and Labrador are tied up once again, as a new protest by the province's fish harvesters threatens to derail the crab fishery for a second straight year.
A unique photo exhibit is putting cameras into the hands of survivors of domestic and sexual violence in Newfoundland and Labrador.
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