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 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.
鈥淥ur 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鈥檛 expect them. That was what motivated me to take a closer look at our killer whale detections.鈥
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.
鈥淚t鈥檚 not necessarily that killer whales haven鈥檛 been reported in these areas before, but that they appear to be remaining in the area for longer periods of time,鈥 said Kimber. 鈥淭his is likely in response to a longer open-water season.鈥
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.
While America's southern border remains a hot button issue on the campaign trail, the result of the U.S. election in November could also impact the northern frontier with Canada, which remains the longest undefended border in the world.
It鈥檚 1998. Google was just born, and dial-up was the primary way to connect to the Internet. New sites were being developed daily on any number of topics, from recipes to shopping. David Yanciw, however, was thinking big - big things, that is.
Canadian musician Jacob Hoggard has been found not guilty of sexually assaulting a young woman in northeastern Ontario eight years ago. The former Hedley frontman had pleaded not guilty to sexual assault.
The Ministry of Labour is investigating a workplace incident that claimed the lives of two people in Georgian Bluffs, south of Owen Sound.
Canadians who are eligible for a GST/HST tax credit can expect their final payment of the year on Friday.
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TikToks of customers stuffing their faces with a US$20 endless shrimp. More than 100 restaurant closures and thousands of layoffs. A revolving door of CEOs. Chapter 11 bankruptcy.
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New data shows the automated speed enforcement camera on King Edward Avenue, between Bolton Street and St. Patrick Street, issued 6,337 speeding tickets in August, the highest number of tickets issued by Ottawa's 40 photo radar cameras.
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After a decade of volunteering for one of North America鈥檚 most punishing ultra marathons, an Ontario man decided to challenge himself by stepping up from the sidelines to become a participant.
The owner of a Gatineau, Que. caf茅 says it's 'silly' that Quebec's language watchdog is telling the business to write its Instagram posts in French.
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Former U.S. president Donald Trump plans to return Saturday to the site where a gunman tried to assassinate him in July, setting aside what are now near-constant worries for his physical safety in order to fulfill a promise 鈥 'really an obligation,' he said recently 鈥 to the people of Butler, Pa.
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A rural Colorado county courthouse beefed up security Friday after threats were made against staff and a judge who sentenced former county clerk Tina Peters to nearly nine years behind bars for her role in a data breach scheme catalyzed by the lie that the 2020 election was stolen from former President Donald Trump.
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The U.S. and British militaries struck more than a dozen Houthi targets in Yemen on Friday, going after weapons systems, bases and other equipment belonging to the Iranian-backed rebels, U.S. officials confirmed.
Prime Minister Justin Trudeau pleaded for peace in the Middle East Saturday, as he decried a civilian death toll he blamed on Hamas, Hezbollah and Israel.
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NDP House leader Peter Julian says there's more his party wants to do in Parliament before the next election, but if the current dysfunction continues it will become a factor in how they vote on a confidence measure.
Bruzzese came down with COVID-19 in February 2023, and received her injection at the end of March. 鈥淏eing able to recognize smells is something we take for granted, until you can鈥檛.鈥
New data raises questions about the drinks people consume and the potential risks associated with them, according to researchers at Galway University in Ireland, in partnership with Hamilton鈥檚 McMaster University.
Convenience store firms that operate thousands of outlets across Canada are taking the federal government to court to overturn regulations that restrict the sale of nicotine pouches to pharmacies.
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Alphabet's Google is testing showing check marks next to certain companies on its search results, a company spokesperson said on Friday, in a move aimed at helping users identify verified sources and steer clear of fake websites.
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The jury tasked with determining if Canadian musician Jacob Hoggard sexually assaulted a young woman in northeastern Ontario eight years ago began deliberating Friday after nearly two weeks of testimony that saw the singer and his accuser give starkly different accounts of what happened.
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Brazil's Supreme Court said on Friday that lawyers representing social media platform X did not pay pending fines to the right bank, postponing its decision on whether to allow the tech firm to resume services in Brazil.
Convenience store firms that operate thousands of outlets across Canada are taking the federal government to court to overturn regulations that restrict the sale of nicotine pouches to pharmacies.
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A group of classic car enthusiasts donated hundreds of blankets to nursing homes in Nova Scotia.
Moving into the second week of October, the eastern half of Canada can expect some brisker fall air to break down from the north
What does New Westminster's t蓹m蓹sew虛tx史 Aquatic and Community Centre have in common with a historic 68,000-seat stadium in Beijing, an NFL stadium and the aquatics venue for the Paris Olympics? They've all been named among the world's most beautiful sports venues for 2024.
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Israel expanded its bombardment in Lebanon on Saturday, hitting Beirut鈥檚 southern suburbs with a dozen airstrikes and striking a Palestinian refugee camp deep in northern Lebanon for the first time.
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It鈥檚 1998. Google was just born, and dial-up was the primary way to connect to the Internet. New sites were being developed daily on any number of topics, from recipes to shopping. David Yanciw, however, was thinking big - big things, that is.
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Bruzzese came down with COVID-19 in February 2023, and received her injection at the end of March. 鈥淏eing able to recognize smells is something we take for granted, until you can鈥檛.鈥
According to the CBRE鈥檚 latest commercial vacancy rate report, London saw a vacancy rate of 31.4 per cent, the highest downtown commercial vacancy rate in Canada.
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A person was airlifted to hospital following a serious crash in Taber, Alta., on Friday morning. Taber RCMP responded to the scene on Highway 864 around 10:30 a.m., for a crash involving an SUV and a semi-truck.
To enhance inclusivity at Lethbridge Polytechnic, the institution has launched a new accessibility micro-credential.
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A soccer game in England on Tuesday night drove a spike in online traffic across the Atlantic to a website launched by the Newfoundland and Labrador government.
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