Arctic ringed seals are the smallest and most abundant seal species in the Arctic, and their entire life cycle revolves around sea ice in ways that no other marine mammal quite matches. They dig breathing holes through thick ice with heavy claws, excavate snow caves to birth and nurse their pups, and time their movements to the annual freeze and thaw of the polar ocean. Understanding how ringed seals live, hunt, communicate, and cope with a rapidly warming environment reveals one of the most tightly ice-adapted mammals on Earth.
Snow Lairs and Breeding on the Ice
Ringed seals are unique among seals in their construction of subnivean lairs, chambers hollowed out in the snowdrifts that accumulate above their breathing holes in landfast ice. These lairs serve two critical functions: they insulate newborn pups from air temperatures that can plunge far below freezing, and they conceal mother and pup from surface predators like Arctic foxes and polar bears.1Canadian Journal of Zoology. The breeding habitat of the ringed seal (Phoca hispida). The birth lair and associated structures Not just any stretch of ice will do. Lairs and breathing holes cluster in areas of deep snow near large, thick ice ridges, and only a small fraction of available fast-ice habitat accumulates enough snow for lair construction in any given year.2Canadian Journal of Zoology. Characteristics of ringed seal, Phoca hispida, subnivean structures and breeding habitat and their effects on predation This makes prime breeding habitat a limited resource, and it helps explain why ringed seals defend territories during the breeding season rather than hauling out in large colonies the way many other seal species do.
Pups are born in these lairs between late February and April, depending on the region. They are covered in a white lanugo coat that provides some insulation but is not waterproof, making the lair’s protection from wind and predators essential during the first weeks of life. Nursing mothers invest heavily in their pups. Research on ringed seals around Svalbard found that lactating females spend more than 80 percent of their time in the water foraging, with maximum dive durations reaching over 21 minutes. Producing a single weaned pup costs a mother roughly 1,073 megajoules of net energy, the equivalent of eating about 185 kilograms of polar cod.3NAMMCO Scientific Publications. Status and biology of ringed seals (Phoca hispida) in Svalbard That is a staggering caloric debt to repay through diving under ice in near-freezing water.
What Ringed Seals Eat
Ringed seals are opportunistic predators with a diet that shifts dramatically by season, region, and the age of the seal. A comprehensive analysis of stomach contents from seals collected at eight locations along Alaska’s coast documented striking variation. During winter and early spring, Arctic cod dominated the diet at every location sampled. But in spring and summer, seals in different areas turned to very different prey: saffron cod near the northeastern Bering and southeastern Chukchi seas, shrimp species in the northcentral Bering Sea, hyperiid amphipods in the central Beaufort Sea, and euphausiids near Barrow where the Chukchi and Beaufort seas meet.4Canadian Journal of Fisheries and Aquatic Sciences. Variability in the Diet of Ringed Seals, Phoca hispida, in Alaska The common thread is that ringed seals rely on prey that forms dense aggregations, whether schooling fish or swarming invertebrates, because concentrated prey patches offer the best energy return for the effort of diving.
Studies farther east in the Canadian Arctic’s Amundsen Gulf confirmed similar patterns, with Arctic cod, sand lance, capelin, and hyperiid amphipods frequently found together in seal stomachs.5ARCTIC. Ringed Seal Diet and Body Condition in the Amundsen Gulf region, Eastern Beaufort Sea Age also matters: in certain regions, older seals consumed more saffron cod than younger ones during spring and summer, while Arctic cod consumption during autumn and winter was more evenly distributed across age classes.4Canadian Journal of Fisheries and Aquatic Sciences. Variability in the Diet of Ringed Seals, Phoca hispida, in Alaska Juveniles may lack the diving ability or territorial access to exploit the same prey patches that adults use, pushing them toward smaller invertebrates or less-contested foraging grounds.
Movement and Long-Distance Travel
Ringed seals are often described as relatively sedentary compared to other pinnipeds, and during the ice-covered months from roughly December through May, most individuals do stay close to their breeding territories. But satellite telemetry data tell a more dynamic story once the ice breaks up. Of 27 seals fitted with tags in one study, nine adults traveled more than 400 kilometers from their breeding site, and four of those moved over 1,000 kilometers. All of these long-distance movements happened between April and November, when Arctic sea ice reaches its annual minimum. The seals that traveled extensively moved away from the coast rather than along it, heading into open offshore waters.6PLoS ONE. Combined Genetic and Telemetry Data Reveal High Rates of Gene Flow, Migration, and Long-Distance Dispersal Potential in Arctic Ringed Seals (Pusa hispida)
This capacity for long-range movement helps explain why genetic analyses find high rates of gene flow across the species’ vast circumpolar range. Ringed seals are not a patchwork of isolated populations the way some marine mammals are. Instead, their annual travel during the open-water season keeps distant populations genetically connected. That gene flow has practical conservation implications: it means that a decline in one area can potentially be offset by immigration from another, but it also means that large-scale habitat loss across multiple regions could erode the species’ genetic resilience in ways that localized protections cannot address.
Staying Alive on the Ice Surface
When ringed seals haul out on the ice to rest, bask, or molt, they are exposed to polar bears, their primary predator. Research near Churchill, Manitoba, compared how ringed seals and harbour seals handle predation risk during spring, when polar bears actively hunt on the sea ice. Ringed seals lifted their heads to scan for threats about 75 percent more often than harbour seals sharing the same area, averaging roughly 36 head lifts per 15-minute observation period compared to about 20 for harbour seals. Interestingly, the duration of each head lift was similar between the species, around three minutes total scanning time per session.7FACETS. Divergent vigilance strategies in sympatric seals facing shared predation risk
The difference likely reflects ringed seals’ evolutionary history as the polar bear’s primary prey. Harbour seals are relative newcomers to many Arctic areas and evolved under different predation pressures. Ringed seals’ hyper-vigilant scanning strategy, checking frequently in short bursts rather than staring for long periods, fits with their solitary ice-dwelling lifestyle. They cannot rely on the safety of numbers the way gregarious species do, so each individual must be its own early warning system. Combined with the concealment offered by snow lairs during the breeding season, this constant alertness is central to how ringed seals coexist with one of the world’s most efficient predators.
Vocalizations and Courtship
Ringed seals are not silent animals, though their underwater vocal behavior has been less studied than that of more conspicuously vocal species. Observations of captive ringed seals identified distinct call types tied to specific social contexts. Long snorts were produced exclusively by an adult male during the breeding season as part of courtship behavior directed at an adult female, suggesting this call type functions as a sexual advertisement. Knocks, on the other hand, were produced by all individuals but most frequently by the adult male, and were often linked to aggressive encounters. The male’s knocks appeared during both territorial aggression and courtship, serving a dual role as both a threat signal and a mating display.8Polar Biology. Underwater vocalizations and associated behavior in captive ringed seals
In the wild, these calls likely carry through the water beneath the ice during the late winter breeding season, when adult males produce a strong, musky odor detectable by hunters and probably perceptible to other seals at a distance. Inuit hunters in Arctic Bay reported that this mustelid-like scent persisted from December through late May or early June, with males referred to as “tiggak” during this period.9Polar Research. Inuit spring hunting techniques and local knowledge of the ringed seal in Arctic Bay (Ikpiarjuk), Nunavut The combination of scent marking, underwater vocalizations, and territorial patrolling suggests a multi-modal signaling system during the breeding season that researchers are still piecing together.
Whiskers Built for Dark Water
Ringed seals spend much of their foraging time in near-total darkness beneath sea ice, and their whiskers are remarkably adapted for this challenge. Anatomical studies of ringed seal vibrissae found that the nerve supply to a single whisker is more than ten times greater than what is typical in terrestrial mammals. Several structural features set these whiskers apart: an upper cavernous sinus, specialized elasticity in the connective tissue anchoring the hair root, and a densely innervated ring sinus area where sensory elements sit along the outer root sheath, functioning almost like a sensory epithelium.10Journal of Zoology. Diving in darkness: whiskers as sense organs of the ringed seal (Phoca hispida saimensis)
In practical terms, this means a ringed seal can detect the hydrodynamic wake left by a passing fish or the pressure wave of a swimming amphipod swarm in complete darkness. Vision is useful near the surface and in summer when some light penetrates the ice, but during the polar night and under thick snow-covered ice, whiskers become the primary hunting tool. This helps explain how ringed seals maintain their body condition through the dark winter months when visual predation would be nearly impossible.
The Annual Molt and Basking Season
After the breeding season ends and pups are weaned, ringed seals enter an annual molt that typically runs from late spring into summer. During this period, they replace their fur and the outer layer of skin, a process that requires good blood flow to the skin surface and is therefore most efficient when the seal is warm and dry. Seals shift their hauling-out behavior accordingly, spending more time on the ice during daylight hours to take advantage of solar warmth. Research on a freshwater subspecies, the Saimaa ringed seal, confirmed that concentrating haul-out time during the hours of peak solar energy is an adaptive strategy during molting, an energetically demanding process.11Wiley Online Library. Seasonal changes in diel haul‐out patterns of a lacustrine ringed seal (Pusa hispida saimensis)
The molt creates a period of vulnerability. Seals haul out in larger numbers and for longer stretches than at any other time of year, making them more visible to predators and more accessible to hunters. Historically, this was the primary season for Inuit seal harvesting. The seals’ need to be on the ice surface for physiological reasons essentially overrides their usual caution, and groups of basking seals can sometimes be spotted from considerable distances across the flat ice.
Subspecies and Landlocked Populations
The ringed seal’s range extends across the entire Arctic Ocean and into several subarctic seas, but some of the most unusual populations are small groups that became isolated in freshwater lakes when glaciers retreated after the last ice age. The Saimaa ringed seal in Finland, the Ladoga ringed seal in Russia, and the Baltic ringed seal in the brackish Baltic Sea all descend from populations that were cut off from the Arctic thousands of years ago. Genetic research supports classifying each of these as distinct taxa, with separate evolutionary trajectories and conservation needs.12PubMed Central. Complex Origins and History of the Relict Fennoscandian Ringed Seals
The Saimaa ringed seal is one of the world’s most endangered seals, with a population numbering only in the hundreds, confined to a single Finnish lake. Its situation illustrates how isolation eliminates the buffering effect of gene flow that Arctic populations enjoy. Every threat, from climate-driven loss of snow cover on the lake ice to bycatch in fishing nets, hits a population with no possibility of reinforcement from elsewhere. The Ladoga and Baltic populations face their own pressures from pollution, shipping traffic, and mild winters that fail to produce sufficient ice for pupping. These landlocked ringed seals offer a stark preview of what could happen to Arctic populations if sea ice declines continue.
Contaminants That Accumulate in Arctic Food Webs
Despite the Arctic’s remoteness, ringed seals carry measurable burdens of pollutants that originate thousands of kilometers away and reach polar waters via atmospheric and oceanic transport. A study of hunted ringed seals from Baffin Island found that young-of-the-year seals, the age class most commonly harvested and consumed by Inuit communities, had lower levels of cadmium, total mercury, and methylmercury in muscle and liver than juveniles and adults. Selenium and mercury were highly correlated in the liver, consistent with the formation of inert selenium-mercury granules that can partially detoxify mercury. Levels of PCBs and flame retardants in blubber were comparable to those measured elsewhere in the Canadian Arctic.13PubMed. Non-essential trace elements, methylmercury, and organic contaminants in hunted ringed seals (Pusa hispida) from Baffin Island, Nunavut, Canada
For Indigenous communities that rely on ringed seal as a traditional food, the age-related contaminant pattern matters. Harvesting younger seals reduces dietary exposure to mercury and persistent organic pollutants compared to consuming older animals, which have had more years to accumulate these substances. Across a broader geographic scale, research spanning a latitudinal gradient in the eastern Canadian Arctic found that ringed seals generally feed more on pelagic prey and carry higher total mercury levels than the larger, bottom-feeding bearded seals in the same regions. A latitudinal pattern also emerged: seals at lower latitudes had lower mercury and fed more pelagically than those at higher latitudes. In years with longer open-water periods, both species shifted toward more pelagic prey, suggesting that climate change is reshaping not just what ringed seals eat but how much mercury they accumulate.13PubMed. Non-essential trace elements, methylmercury, and organic contaminants in hunted ringed seals (Pusa hispida) from Baffin Island, Nunavut, Canada
New Neighbors and New Diseases
As the Arctic warms, temperate marine mammal species are expanding northward into areas that ringed seals have long occupied with few competitors. Harbour seals, for instance, are now regularly found in fjords around Svalbard that were previously too ice-covered for them. This overlap brings more than competition for food and resting spots. Research in Kongsfjorden, Svalbard, found that the arrival of harbour seals poses a real risk of introducing pathogens to which Arctic-endemic seals have no prior immune exposure. The introduction of new viruses or bacteria through range-expanding temperate species could have severe consequences for immunologically naive ringed seal populations.14Marine Mammal Science. Sharing Is Caring?—Pathogens and Pathogen‐Specific Antibodies in Arctic Endemic Seal Species and the Newly Sympatric Harbor Seals in Kongsfjorden, Svalbard
Phocine distemper virus, which devastated harbour seal populations in European waters during outbreaks in 1988 and 2002, is one candidate pathogen of concern. Ringed seals have limited exposure history with this virus, and an introduction into a dense hauling-out group during the molt season could spread rapidly. The disease risk compounds other climate-related stresses: if warming simultaneously degrades breeding habitat, reduces prey availability, and introduces novel pathogens, ringed seal populations face pressure from multiple directions at once.
Inuit Knowledge and the Seal’s Cultural Role
For Inuit communities across the Canadian Arctic, the ringed seal is not just one animal among many. Hunter surveys in Arctic Bay, Nunavut, identified it as the single most important animal used by the community.9Polar Research. Inuit spring hunting techniques and local knowledge of the ringed seal in Arctic Bay (Ikpiarjuk), Nunavut Seal meat and blubber remain dietary staples, the skins are used for clothing and crafts, and the hunt itself carries deep cultural significance. Inuit ecological knowledge also contributes observations that complement scientific research. Hunters in Arctic Bay reported noticing size differences among seals in different regions of the pack ice, the timing and duration of the male odor season, and the occurrence of males near pup lairs, a behavior that researchers have rarely documented directly. Hunters also reported increasing frequencies of liver abnormalities in their catches, a troubling observation that could relate to contaminant exposure or parasitic infection.9Polar Research. Inuit spring hunting techniques and local knowledge of the ringed seal in Arctic Bay (Ikpiarjuk), Nunavut
The integration of Indigenous knowledge with scientific monitoring is particularly valuable for ringed seals because so much of their life happens out of researchers’ reach, inside snow lairs, beneath thick ice, in remote areas far from research stations. Hunters who have pursued seals for decades can detect shifts in behavior, body condition, and distribution years before a satellite-tracking study or population survey might pick them up. Throughout the Arctic, sustainable harvest management now increasingly attempts to incorporate these observations, though challenges remain in reconciling traditional knowledge systems with the quantitative frameworks that wildlife management agencies rely on.15Ecosphere. Harvest sustainability assessments need rethinking under climate change: A ringed seal case study from Svalbard, Norway
How Warming Reshapes the Entire System
Nearly every aspect of ringed seal life described above connects back to ice, and the ongoing decline in Arctic sea ice extent and thickness has cascading consequences. Thinner ice produces shallower snowdrifts, which means fewer suitable sites for lair construction. Earlier spring breakup exposes pups before they are fully weaned or have shed their lanugo, increasing mortality from hypothermia and predation. Reduced ice coverage in summer forces seals into different foraging habitats, potentially pushing them toward different prey assemblages with different contaminant profiles.
Harvest sustainability assessments, which once operated under relatively stable assumptions about population size and reproductive output, now face the challenge of accounting for an environment that is changing faster than the species can adapt. As one study framed it, assessments of ice-affiliated marine mammals as subsistence resources need rethinking in light of the detrimental effects that sea ice decline is having on their habitats.15Ecosphere. Harvest sustainability assessments need rethinking under climate change: A ringed seal case study from Svalbard, Norway For a species whose evolutionary success has been built entirely on mastering life at the ice-ocean interface, the pace of Arctic warming represents an unprecedented test of adaptability. Whether the ringed seal’s capacity for long-distance movement, dietary flexibility, and high reproductive potential can compensate for the loss of the frozen platform on which everything else depends remains one of the central questions in Arctic marine ecology.