Alaska
Strategic Sex: Alaska’s Beluga Whales Swap Mates for Survival
An aerial view of a large aggregation of adult beluga whales in a bay during the summer in the High Arctic. (Photo credit: Greg O’Corry-Crowe and Cortney Watt, Arctic Whale Research Program – FAU/DFO)
Study Snapshot: In the icy waters of Alaska’s Bristol Bay, beluga whales survive through a surprising strategy: mating with multiple partners over several years. Researchers from FAU Harbor Branch, the Alaska Department of Fish and Game, and the North Slope Department of Wildlife Management used long-term genetic analysis and behavioral observations to show that both males and females share reproductive opportunities, creating numerous half-siblings and maintaining genetic diversity in this small, isolated population.
This polygynandrous system helps buffer the population against genetic drift, the random loss of genes in small groups. By spreading reproduction across many individuals over a long reproductive lifespan, belugas reduce inbreeding and preserve long-term resilience, highlighting the critical role of both male strategies and female mate choice in shaping the next generation.
In the icy waters of Alaska’s Bristol Bay, a new study reveals how a small population of beluga whales (Delphinapterus leucas) survive the long haul through a surprising strategy: they mate with multiple partners over several years. The combination of long-term genetics, observation and careful analysis is starting to reveal some of the most intimate insights into one of the Arctic’s most elusive whales.
Beluga whales live in a world that’s difficult for scientists to observe, so surprisingly little is known about how they choose mates, compete for partners, or raise their young in the wild.
Researchers from Florida Atlantic University’s Harbor Branch Oceanographic Institute in collaboration with the Alaska Department of Fish and Game, and the North Slope Borough Department of Wildlife Management in Alaska, are the first to uncover how wild beluga whales mate, who fathers which calves, and how these reproductive strategies influence genetic diversity and inbreeding.
Over 13 years, researchers collected genetic samples from 623 beluga whales in Bristol Bay, while also observing their social groupings and ages. This population is composed of about 2,000 whales and is largely isolated, with little or no mixing with other populations, offering a unique opportunity to study them as a distinct population.
Because belugas are long-lived, researchers focused on short-term mating strategies – what happens in a single breeding season or across a few years – rather than an entire lifetime. They wanted to determine if beluga whales in Bristol Bay were polygynous, where one male mates with multiple females; polyandrous, where one female mates with multiple males; or possibly polygynandrous, where both males and females have multiple mates.
Published in Frontiers in Marine Science, the study reveals that this beluga whale population engages in highly strategic mating – a polygynandrous system. Both males and females mate with multiple partners over several years. Variance in reproductive success among individuals is moderate rather than being dominated by just a few individuals. This “mate switching” results in many half-siblings and few full-siblings and may reduce the risk of inbreeding and help maintain genetic diversity despite the population’s small size and isolation.
“What makes this study so thrilling is that it upends our long-standing assumptions about this Arctic species,” said Greg O’Corry-Crowe, Ph.D., senior author, a research professor of Wildlife Evolution and Behavior at FAU Harbor Branch and a National Geographic Explorer. “Because males are much larger than females and appear to spend little time associating with mothers and calves, scientists believed belugas were likely to be highly polygynous, where males spend a lot of time competing for mates and only a few dominant males fathering most of the calves. Our findings tell a very different story. In the short term, males are only moderately polygynous. One explanation we think lies in their incredible longevity – belugas can live perhaps 100 years or more. Rather than competing intensely in a single season, males appear to play the long game, spreading their reproductive efforts over many years. It appears to be a ‘take your time, there’s plenty of fish in the sea’ strategy.”
Meanwhile, findings from the study show that females have their own equally fascinating reproductive strategy. Rather than sticking with a single partner, they frequently switch mates from one breeding season to the next. This behavior may serve as a form of risk management, allowing females to avoid pairing with low-quality males and increasing the likelihood of producing healthy, genetically diverse offspring.
“It’s a striking reminder that female choice can be just as influential in shaping reproductive success as the often-highlighted battles of male-male competition,” said O’Corry-Crowe. “Such strategies highlight the subtle, yet powerful ways in which females exert control over the next generation, shaping the evolutionary trajectory of the species.”
Interestingly, researchers did not find any differences between older and younger adults in terms of how many had young calves in the population at any one time, for either males or females. However, older mothers had more surviving calves than younger ones, suggesting experience, body condition, and mate choice boost reproductive success. Most adults – male and female – had only a few offspring at a time, reflecting slow female reproduction, and the fact that males father only a small number of calves each year.
The study underscores the importance of considering mating systems in conservation, especially for small or isolated populations. In polygynandrous systems, mate choice, partner switching, and shared reproductive opportunities spread genes more evenly, maintaining genetic diversity, limiting inbreeding, and offsetting the deleterious impacts of small effective population size. This helps buffer against genetic drift, which can otherwise erode diversity when only a few individuals reproduce.
“Understanding these dynamics matters for conservation. If only a few males father most calves, the effective population size becomes much smaller than the number of whales actually present,” said O’Corry-Crowe. “This loss of genetic diversity increases the risk of inbreeding and reduces the population’s ability to adapt to environmental change. Frequent mate switching combined with low reproductive ‘skew’ and possibly the active avoidance of mating with close relatives, may be effective strategies to maintaining the genetic health of relatively small populations.”
Much of the motivation for this study came from the Indigenous communities of Bristol Bay who worked with the team of scientists to conduct the research and to meld scientific research with Indigenous knowledge as a means to protect and co-manage beluga whales in a changing Arctic and sub-arctic. Their partnership was invaluable to the success of the project.
“We cannot afford to be complacent. Small populations still face the dangers of genetic erosion. But we can be optimistic that beluga whale mating strategies provide evidence of nature’s resilience and offers hope for those working to save and recover small populations of any species,” said O’Corry-Crowe.
Study co-authors are Lori Quakenbush, Alaska Department of Fish and Game, Arctic Marine Mammal Program; Tatiana Ferrer, coordinator of research programs, FAU Harbor Branch; and John J. Citta, Ph.D., and Anna Bryan, Alaska Department of Fish and Game, Arctic Marine Mammal Program.
This research was supported by the Alaska Beluga Whale Committee, the Alaska Department of Fish and Game, the National Marine Fisheries Service, the North Pacific Research Board, NOAA, and FAU Harbor Branch.
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Beluga whales in the High Arctic during the summer. A group of beluga whale bulls in a bay, followed by two cow-calf pairs in a shallow river estuary. An all-male group of beluga whale bulls swims alongside a female with a young calf, showing the size difference between adult males and females and the cream-gray color of the calf. The video ends with a large aggregation of adult beluga whales in a bay during the summer in the High Arctic. (Video Credit: Greg O’Corry-Crowe and Cortney Watt, Arctic Whale Research Program – FAU/DFO)
A group of beluga whale bulls in a bay during the summer in the High Arctic. (Photo credit: Greg O’Corry-Crowe and Cortney Watt, Arctic Whale Research Program – FAU/DFO)
Two beluga whale cow-calf pairs in a shallow river estuary in the High Arctic. (Photo credit: Greg O’Corry-Crowe and Cortney Watt, Arctic Whale Research Program – FAU/DFO)
-FAU-
Alaska
Opinion: Life lessons learned from mushing and old-time Alaska
This is the beginning of the Iditarod spring, signaled by the burst of sun and what used to be the long wait for dog teams to pass under the arch in Nome, the finish line a thousand miles away from Anchorage. For old-timers, it’s the story of the way Alaska used to be. What once was a 30-day wait has become about 10 days for winners to celebrate and the rest of us to shout, “Well done.”
My story is about family that welcomed immigrants from all over the world to be among the last groups of Indigenous people in the country, a life of taking good care of dog teams, and of parents who taught their children how to live in a wild, rugged frontier.
I came to be in a different age, a time of dog teams that ruled the trails to mining camps and where the salmon ran strongest — before the introduction of the snowmachine that revolutionized rural and Native Alaska.
For the Blatchford family, it is a recognition that some things will always stay the same and everything else changes. All four of my grandparents were noncitizens. My mother Lena’s parents of Elim were Alaska Natives, as was my dad Ernie’s mother, Mae, of Shishmaref. The name Blatchford comes from his father, the Englishman who was born in Cornwall and arrived in Nome during the gold rush. His brother, William, was one of the early immigrants, and by 1899 there was a creek just outside Nome named after him. He discovered gold. My grandfather, Percy, found gold, too, but it was a different kind of wealth, a finding that he had found home and never left.
I was born in Nome, delivered by an Iñupiaq Eskimo midwife in a one-room cabin where the frozen Bering Sea met the treeless tundra’s permafrost. Dad had a dog team. I like to think that the dogs were anxious for me to be born because it was hunting time for Dad to hitch them up and mush out to where the sea mammals, snowshoe hares, ptarmigan and other game thrived in the winter. My earliest memories are of dogs; all of them working as a team to bring home the game so we could have a fine meal cooked by Lena. In the Arctic, dogs were essential for family survival. If you didn’t hunt, you didn’t eat.
There are several memories that remain strong. I suppose I can call them lessons of the Arctic.
The first is to take care of the dogs and treat them well. Dog lovers all over the world know very well that a dog, whatever the breed, is loyal and will die to protect the one who feeds and pets it. If you don’t feed a husky, it won’t pull, and it could mean a long time before the family eats. When a dog team is hungry, it will race back home to be fed a healthy meal. Mother Lena must have been a great cook because Dad said the dog team always raced back to the edge of Nome, where Lena was waiting beside the propane stove. For Mike, Tom and me, our job was to take the rifle, shotgun and .22 into the cabin to be cleaned and oiled. Once that was quickly done, we unhitched the dogs and then fed the team.
All three of us boys had special responsibilities to Tim, Buttons and Girlie. Tim, the lead dog, was brother Mike’s pet; Tom had Buttons, and I had Girlie. We made sure they were healthy and well cared for. Dad would often comment that “Papa,” our grandfather Percy, the Englishman, took good care of his dog teams, being kind to the dogs and feeding them. Dad was the oldest of a large family that lived in Teller and later Nome.
“Papa” Percy was a prospector, fox farmer and a contestant in the All-Alaska Sweepstakes, the dog team race from Nome to the mining camp of Candle, a 400-mile race. He didn’t win, but he finished well, very well. The stories of the Sweepstakes have remained with the family for over a century. At a memorial service in Palmer for “Doc” Blatchford, Aunt Marge, without a question or a prompt, said that Papa took good care of his dogs.
Percy Blatchford was a legend in the Alaska Territory. As a teacher of Alaska newspapers, I would find headlines similar to one in the Fairbanks Daily News-Miner that blazed on the front page: “Blatchford Wins Solomon Derby.” There was even a story in The New York Times.
There’s probably no other sport in Alaska that brought Alaskans together like dog mushing. When old-timers would visit over strong coffee, dogs and dog team racing would come up. In the territory, there were few high schools and fewer gymnasiums, so the only team sport was dog mushing. It was something to talk about that was unique to Alaskans.
I used to travel in rural Alaska quite a bit. In the smaller communities, I would see the teams and would wonder how long they would power the engines that brought the mail and the foodstuffs down and up the trails. When I think of dog teaming, I think of the Iditarod and wonder, and then come to know, what the strength of the story would mean for bringing generations together from Papa Blatchford to his eldest son Ernie and to the fourth generation of Blatchfords in Alaska.
There are times when I think that old-time Alaska is gone. But then my faith and confidence in the old-time spirit are ignited when I see what others in the Lower 48 see. When I was walking in downtown Philadelphia, I looked up and saw on an ancient federal building a stamped concrete sculpture of a dog musher leaning into a blizzard. Such is the way I think of the Iditarod and the lessons I learned growing up with the dog team, preserved in my memories.
Edgar Blatchford is former mayor of Seward, Mile 0 of the Iditarod Trail.
• • •
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Alaska
These lines are adding Alaska cruises. Is your favorite on the list?
New Alaska voyages debut in 2026 as lines like MSC Cruises and Virgin Voyages expand into the booming market.
How to find the best price, perks when booking a cruise
Find the cruise that works for your budget with these tips.
Problem Solved
Travelers will have new ways to see Alaska this year.
A number of cruise lines are launching sailings to the Last Frontier in 2026, from luxury to large family-friendly and adults-only ships. About 65% of people visiting the state during the summer do so by cruise ship, according to Cruise Lines International Association Alaska, and demand is high.
“I think Alaska is always very popular, but we’re seeing that ships are selling out way quicker than they used to,” Joanna Kuther, a travel agent and owner of Port Side Travel Consultants, told USA TODAY.
With new inventory opening up this season, here’s what travelers should know about Alaska cruises.
Which cruise lines are adding Alaska sailings?
- MSC Cruises will launch its first-ever Alaska sailings aboard MSC Poesia on May 11. The ship will be fresh from dry dock to add enhancements, including the line’s luxe ship-within-a-ship concept, the MSC Yacht Club.
- Virgin Voyages’ newest ship, Brilliant Lady, will operate the company’s inaugural Alaska cruises. The adults-only cruise line will set sail there starting on May 21.
- The Ritz-Carlton Yacht Collection will debut its first Alaska cruises this year on its Luminara vessel. The first of those sailings will depart on May 28.
Those join other operators like Holland America Line, Princess Cruises, American Cruise Lines, Norwegian Cruise Line, Royal Caribbean International, Disney Cruise Line, Celebrity Cruises and more.
What are the draws of Alaska cruises?
Glaciers are a major attraction for visitors. “One of the major (draws) is Glacier Bay,” said Kuther. “…And then the other one is definitely the wildlife.”
That includes bears, whales, moose and salmon. In addition to its many natural wonders, the state is also a cultural destination where visitors can learn about its Native peoples.
When is the best time to take an Alaska cruise?
That depends what you’re looking for. The Alaska cruise season generally runs from April through October, and Kuther said visitors will tend to see more wildlife between the end of June through August.
“That’s super peak season,” she said. “That’s also where you’re going to have more families, more crowds.” Some locals have also said those crowds are putting a strain on the very environment tourists are there to see.
Travelers may find less packed ships and ports by visiting earlier or later in the season – and there are other perks. If passengers go in May “it’s still a little bit snowy, so your scenery is going to be really cool,” Kuther said. Travelers visiting in September or October, meanwhile, could have a better shot at seeing the northern lights.
Where do ships usually sail?
The most popular itinerary is the Inside Passage, according to Kuther. That often sails round-trip from Seattle or Vancouver with stops such as Juneau, Skagway and Ketchikan. “People will go back to Alaska and do different routes,” she said. “This is a very good way to start.”
Other options include one-way cruises between Vancouver or Seattle and Anchorage. Travelers can also take cruisetours that combine sailings with land-based exploration, including train rides and tours of Denali National Park and Preserve.
Tips for Alaska cruises
- Book early: Alaska itineraries sell out quickly, and so do shore excursions. Unique offerings like helicopter tours and dog sledding are popular, and there are only so many spots.
- Consider a balcony cabin: This is “almost a must” in Kuther’s opinion. Crew members may make announcements about whales or other sightings near the ship, and guests with their own private viewing spot won’t have to race out on deck.
- Pack carefully: “Packing is an art when it comes to Alaska,” Kuther said. “It really is, because you need so many things.” Her top three picks are bug spray, layers of clothing for the fluctuating temperatures and a waterproof jacket in case of rain.
Nathan Diller is a consumer travel reporter for USA TODAY based in Nashville. You can reach him at ndiller@usatoday.com.
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