Walruses are not extinct. Both the Atlantic walrus and the much larger Pacific walrus population survive today across the Arctic, though they have disappeared entirely from parts of their former range due to centuries of commercial hunting. The species faces a genuinely uncertain future, however, because the sea ice it depends on is shrinking fast, and a suite of newer threats from toxic algal blooms to industrial shipping are compounding the pressure. Understanding where walruses stand requires looking at what nearly wiped them out, what brought some populations back, and what could push them toward real danger in the decades ahead.
Two Subspecies Across Two Oceans
The walrus, Odobenus rosmarus, is the sole surviving member of a once-diverse family of pinnipeds that evolved prominent tusks, enormous body size, and a specialized suction-feeding technique over millions of years.1Academic Press. The surprising evolutionary heritage of the Atlantic walrus as chronicled by the fossil record Today, most researchers recognize two subspecies: the Pacific walrus (Odobenus rosmarus divergens), found in the Bering, Chukchi, and Laptev Seas, and the Atlantic walrus (Odobenus rosmarus rosmarus), scattered in smaller groups from eastern Canada through Greenland, Svalbard, and Russia’s western Arctic.2Encyclopedia of Marine Mammals. Walrus: Odobenus rosmarus A third subspecies, the Laptev Sea walrus, was once listed in some classification schemes, but molecular and morphometric analysis has shown that these animals cluster genetically with Pacific walruses and are better treated as the westernmost population of O. r. divergens rather than a separate subspecies.3Zoologica Scripta. The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited
The Pacific walrus is by far the more numerous of the two subspecies. Estimates have fluctuated over the decades, but the population is generally described in the low hundreds of thousands. Atlantic walrus numbers are far smaller and fragmented across at least eight recognized management stocks, some of which contain only a few hundred animals. The International Union for Conservation of Nature (IUCN) lists the species overall as Vulnerable, a category meaning it faces a high risk of extinction in the wild if current trends continue. That is a long way from extinct, but it is also a long way from safe.
Centuries of Hunting Nearly Did the Job
If walruses ever came close to extinction, it was during the commercial hunting era. In the waters around Svalbard alone, thousands of Atlantic walruses were killed during the seventeenth, eighteenth, and nineteenth centuries, alongside tens of thousands of bowhead whales. The slaughter was so thorough that walruses were effectively eliminated from parts of the archipelago, and the removal of so many large consumers freed up enormous quantities of shellfish and plankton for other species.4Environment and History. Three Centuries of Whaling and Walrus Hunting in Svalbard and its Impact on the Arctic Ecosystem The Pacific walrus suffered a parallel collapse in the late nineteenth and early twentieth centuries. Commercial ivory and hide harvests, peaking between roughly 1880 and the 1950s, may have cut the population by half to three-quarters of its historical size.5Journal of Mammalogy. Spatial genetic structure and asymmetrical gene flow within the Pacific walrus
One of the starkest examples of local extinction comes from Iceland. Radiocarbon-dated walrus remains show an almost continuous presence on the island for about 7,500 years, mostly concentrated along the western coast. These Icelandic walruses carried eight unique mitochondrial DNA haplotypes found in no living walrus population, representing a genetically distinct lineage within the Atlantic subspecies. Norse settlers arrived around the ninth century, and the Icelandic walrus disappeared sometime between the eleventh and twelfth centuries, with the latest dated specimens falling in the range of 1213 to 1330 AD.6PubMed Central. Fast Track Disappearance of Icelandic Walruses Coincided with Norse Settlement That genetic lineage is gone forever. The story is a reminder that “not extinct” at the species level can still mean permanent losses at finer scales.
Genetic Resilience Despite the Bottleneck
Given how steeply walrus numbers dropped during commercial hunting, you might expect the survivors to carry the scars in their DNA, the way cheetahs or northern elephant seals show dramatically low genetic diversity after their own population crashes. The evidence in walruses tells a more reassuring story, at least on the Pacific side. Despite the prolonged exploitation between 1880 and the 1950s, researchers found no clear genetic signature of a bottleneck in either microsatellite or mitochondrial DNA diversity in Pacific walruses. The decline apparently never compressed the effective breeding population below the threshold where genetic diversity starts to erode rapidly.5Journal of Mammalogy. Spatial genetic structure and asymmetrical gene flow within the Pacific walrus
A separate study comparing ancient and modern Pacific walrus samples confirmed that genetic diversity declined only slightly across the bottleneck period, less than expected given the scale of the harvest. Pacific walruses also carry significantly higher nucleotide and haplotype diversity than Atlantic walruses, consistent with a much larger effective population size in the Pacific.7Scientific Reports. Ancient DNA indicates a century of overhunting did not reduce genetic diversity in Pacific Walruses (Odobenus rosmarus divergens) The Atlantic walrus, with its smaller, more fragmented populations, has less genetic cushion to absorb future shocks. That asymmetry matters when evaluating which stocks face the greatest long-term risk.
Why Sea Ice Loss Is the Central Threat
Commercial hunting has been regulated or banned for decades, and subsistence harvests by Indigenous communities are managed at sustainable levels. The threat that dominates modern conservation discussions is the loss of Arctic sea ice. Walruses use sea ice as a floating platform for resting between foraging dives, nursing calves, and avoiding predators. When ice disappears from the shallow continental shelves where walruses feed, the animals are forced onto land-based haulouts instead. From shore, they have to travel farther to reach their food, burning more energy on each round trip. They also face greater risks of predation and, critically, of stampede-related deaths when thousands of animals crowd together on a beach and a disturbance triggers a panicked rush to the water.8bioRxiv. Assessing the Population Consequences of Disturbance and Climate Change for the Pacific Walrus
Behavioral data underscores just how much ice matters to a walrus’s energy budget. When only sea ice is available as a resting platform, which typically happens during summer and early autumn over the continental shelf, walruses spend the most time foraging and the greatest proportion of their time in the water is devoted to actual feeding rather than traveling. That arrangement appears to be the most energy-efficient lifestyle. When only land is available, which tends to happen in late autumn after ice retreats beyond the shelf edge, walruses spend less total time in the water and less of that time foraging.9Journal of Mammalogy. Walrus haul-out and in water activity levels relative to sea ice availability in the Chukchi Sea In other words, ice-free conditions do not just inconvenience walruses. They fundamentally alter the animals’ ability to feed efficiently.
Interestingly, the two subspecies may not be equally vulnerable to warming. Atlantic walruses, while generally smaller in number, appear to be less negatively affected by warming and declining sea ice than their Pacific counterparts, and possibly less affected than other ice-associated seals. Researchers have suggested that some Atlantic populations could persist into the future, particularly in areas where human disturbance is low and suitable shoreline haulouts are close enough to feeding grounds to keep energy costs manageable.10Academic Press. The future of Atlantic walrus in a rapidly warming Arctic That is cautiously optimistic, but it hinges on conditions staying favorable in those specific refugia.
Toxic Blooms and Acidifying Seas
Climate change is not just melting ice. It is reshaping the Arctic food web in ways that create novel hazards. One of the more alarming developments involves harmful algal blooms. The dinoflagellate Alexandrium catenella, which produces paralytic shellfish toxins, has become more active in the Alaskan Arctic as ocean temperatures rise. Walruses ingest these toxins through their prey, primarily clams and other bivalves that filter the algae from the water. In surveys conducted in 2019 and 2022, the estimated toxin doses from walrus prey exceeded moderate health-risk thresholds in roughly two-thirds to nearly nine-tenths of cases. Ledyard Bay in the northeastern Chukchi Sea was identified as a particular hotspot because it combined high toxin concentrations with proximity to the Point Lay haulout, where large numbers of walruses gather on shore.11PubMed Central. Walruses are potentially exposed to paralytic shellfish toxin concentrations that impact their health during Alexandrium blooms in the Alaskan Arctic
The long-term effects on walrus health are not fully understood yet, but paralytic shellfish toxins can cause neurological impairment, and even sublethal exposure could affect a walrus’s ability to dive, forage, or nurse its calf. This is a threat that essentially did not exist a few decades ago, because the Arctic was too cold to support large Alexandrium blooms.
Separately, the prey base itself may be at risk. Bivalve molluscs are central to walrus diets, and they are also sensitive to ocean acidification. As Arctic waters absorb more carbon dioxide and pH drops, some regions may become undersaturated with respect to aragonite, the form of calcium carbonate that many bivalve species use to build their shells. If the clams and mussels that walruses rely on become less abundant or slower-growing, the animals will face yet another pressure on top of the energy costs of losing sea ice.12Journal of Shellfish Research. The Case of the ‘Missing’ Arctic Bivalves and The Walrus: The Biggest [Overlooked] Clam Fishery on the Planet
Industrial Activity and Human Disturbance
The Arctic is opening for business as ice retreats. Shipping routes that were once impassable are becoming viable for longer seasons. Offshore oil and gas exploration is expanding into walrus habitat. Mining interests are eyeing newly accessible coastal areas. All of this brings noise, vessel traffic, and the risk of oil spills into waters walruses use for feeding and transit.
Managing these impacts is harder than it sounds. The level of protection walrus habitat actually receives depends almost entirely on the rigor of environmental impact assessments, and basic information about walrus numbers and population structure is often lacking in the areas where development is being proposed. Cumulative impacts from multiple overlapping industrial activities are recognized in environmental legislation but remain difficult to evaluate in practice. Enforcement depends on industry compliance and the capacity of management authorities to monitor it.13NAMMCO Scientific Publications. Management of Atlantic walrus (Odobenus rosmarus rosmarus) in the arctic Atlantic
Even relatively benign human activities can cause problems. Tourism in the Arctic has surged in recent years, and walrus haulouts are a major draw. Drones, increasingly popular for both tourism and wildlife photography, can disturb hauled-out walruses. Research in Svalbard found that walruses responded to drone approaches at distances under 50 meters, a range easily breached by casual recreational flyers who may not realize how close is too close.14Marine Mammal Science. Drones and marine mammals in Svalbard, Norway Disturbance at a haulout packed with thousands of animals can trigger stampedes. When animals weighing over a ton rush toward the water in a panic, calves and juveniles are crushed. These events have killed hundreds of walruses at a time.
What Walruses Do for the Arctic Seafloor
Walrus conservation is not just about preserving a charismatic species. These animals reshape the environment they live in. When a walrus feeds, it roots through sediment to extract buried clams, creating long furrows on the seafloor that average about 47 meters long, 0.4 meters wide, and 0.1 meters deep. These feeding excavations have been documented over more than 6,600 square kilometers of the Bering Sea shelf.15Journal of Sedimentary Research. Gray whale and walrus feeding excavation on the Bering Shelf, Alaska
The cumulative effect of all this digging is substantial. Walrus bioturbation, the disturbance and mixing of sediment by biological activity, magnifies the flow of nutrients from sediment pore water into the water column by roughly two orders of magnitude over wide areas. That nutrient release supports the productivity of the broader benthic and pelagic food web. The walrus is, in effect, one of the Arctic’s major ecosystem engineers, turning over sediment at a scale comparable to gray whale feeding in the same region.16Journal of Experimental Marine Biology and Ecology. Pacific walrus: Benthic bioturbator of Beringia Losing walruses would not just mean losing walruses. It would mean losing a process that structures Arctic seafloor communities.
Counting Walruses from Space
One of the persistent frustrations of walrus conservation is that the animals are extremely difficult to count. They live in remote, icy, often fog-shrouded waters. Aerial surveys are expensive, weather-dependent, and logistically punishing. You cannot manage a population whose size you do not know, and for several walrus stocks, the data are genuinely sparse.
Satellite imagery is beginning to change that. Very high-resolution commercial satellites can now resolve individual large animals on land, and researchers have been validating satellite-based counts against conventional aerial survey data for Atlantic walrus haulouts. The technology offers the potential to monitor remote haulouts across huge areas without sending aircraft, reducing both cost and disturbance to the animals themselves.17Remote Sensing Applications: Society and Environment. Validation of satellite imagery for quantitative population assessment and monitoring of Atlantic walrus Current work is exploring machine learning models for automated detection of walruses in satellite images, with expert manual review to maintain accuracy and quantify uncertainty.18ICES Journal of Marine Science. A roadmap towards monitoring walruses from space
The practical payoff could be significant. If satellite monitoring becomes routine, it would give managers near-real-time information on which haulouts are occupied, how many animals are present, and how populations respond to changes in ice conditions or human activity. For some of the smallest Atlantic walrus stocks, where current population estimates carry enormous uncertainty, even rough satellite counts would be a major improvement over what exists now. The technology is not quite operational yet, but the trajectory is promising and could reshape Arctic wildlife management within the next decade.
What the Walrus’s Future Actually Depends On
The honest assessment from researchers who study walruses is that the species will probably survive into the foreseeable future, but with significant caveats. Atlantic walruses may find workable refugia in places where terrestrial haulouts sit close to productive feeding grounds and human disturbance stays low.10Academic Press. The future of Atlantic walrus in a rapidly warming Arctic Pacific walruses face a harder road because the Bering and Chukchi continental shelves, their primary feeding habitat, are experiencing some of the most dramatic sea ice losses anywhere in the Arctic. The question is not whether walruses will endure this century. It is whether individual populations, especially the smaller Atlantic stocks, will retain enough numbers and genetic diversity to remain viable, and whether the ecosystem services walruses provide will persist at meaningful scales.
Walruses have survived ice ages, interglacials, and the evolution and extinction of every other member of their family. Their lineage is old and has weathered enormous environmental swings. But the current rate of Arctic warming is unlike anything in walrus evolutionary history, and it is compounded by industrial encroachment, algal toxins, acidifying waters, and growing human presence in previously inaccessible habitat. Survival as a species seems likely. Survival of every population, in every part of the current range, at ecologically meaningful densities, is a much harder bet to make.