Photographs - Paul Nicklen | Cristina Mittermeier | Keith Ladzinski
As the Antarctic Peninsula heats up, the rules of life there are being ripped apart. Alarmed scientists aren’t sure what all the change means for the future.
Shane Moore, Andy Mann, Jeff Patterson/RVRD
Dion Poncet came of age in a place almost no one calls home.
He was born on a sailboat in Leith Harbour, an abandoned whaling station on South Georgia island. His father, a French adventurer, had met his mother, an Australian zoologist, on a jetty in Tasmania while sailing his boat around the world. The couple started a family in the South Atlantic. For years they traversed the west coast of the Antarctic Peninsula, surveying wildlife in uncharted bays—seals, flowering plants, seabirds—with three boys in tow. Dion was the first.
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| Click here to see a detailed map of the Antarctic Peninsula and of how climate change is affecting its ice cover. |
On a frigid evening nearly 30 years later, Poncet and I stood in the wheelhouse of his 87-foot boat, the Hans Hansson, scanning the ice for Adélie penguins. At 39, Poncet is blond, block-jawed, and quiet, with enormous hands. He has spent much of his adult life ferrying scientists and other visitors in charter boats through the waters around South Georgia and Antarctica from his base in the Falklands. Along with a team of photographers led by Paul Nicklen, I had joined him for a voyage along the west coast of the Antarctic Peninsula. We wanted to see how things were changing in a region he’d known his whole life.
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| Adélie penguins slip and slide on ice; behind them, on Paulet Island,
thousands more line the rocky, guano-streaked slopes. Adélie colonies
along the peninsula’s western shores have collapsed as waters have
warmed. But here on the peninsula’s northeast tip, winds and ocean
currents keep waters a little cooler, and Adélies are thriving. Paul Nicklen LARGE IMAGE |
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A damp Adélie fledgling struggles to shake the moisture from its muddy
down. Warming has increased precipitation so much along the western
Antarctic Peninsula that many penguin chicks— whose moisture-repelling
feathers haven’t yet come in— get soaked and then freeze to death in
polar winds. Cristina Mittermeier LARGE IMAGE |
| On a morning when five leopard seals could be seen circling nearby,
these chinstrap, gentoo, and Adélie penguins raced ashore, stumbling
and bumping into one another on their way back to their respective
colonies. Keith Ladzinski LARGE IMAGE |
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He grew up in Antarctica. Now he's leaving. Dion Poncet was born on a sailboat in Antarctica. Now his home is disappearing right in front of his eyes.
Here at the bottom of the world, a place all but free of human settlement, humanity is scrambling one of the ocean’s richest wildernesses. Fossil-fuel burning thousands of miles away is heating up the western peninsula faster than almost anywhere else. (Only the Arctic compares.) The warming is yanking apart the gears of a complex ecological machine, changing what animals eat, where they rest, how they raise their young, even how they interact. At the same time, the shrimplike krill upon which almost all animals here depend for food are being swept up by trawlers from distant nations. They’re being processed into dietary supplements and pharmaceuticals, and fed to salmon in Norwegian fjords and to tropical fish in aquariums.
So much here is changing so fast that scientists can’t
predict where it’s all headed. “Something dramatic is under way,” says
Heather Lynch, a penguin biologist at Stony Brook University. “It should
bother us that we don’t really know what’s going on.”
What we can see is troubling enough. On the western peninsula, Adélie penguin populations have collapsed, some by 90 percent or more. Records of great hordes of the birds in one bay date back to 1904; today in that spot “there are only about six nests left,” Poncet says. That day in the wheelhouse, when Poncet and I spotted our first massive colony, we had left the west for the peninsula’s northeast tip.
What we can see is troubling enough. On the western peninsula, Adélie penguin populations have collapsed, some by 90 percent or more. Records of great hordes of the birds in one bay date back to 1904; today in that spot “there are only about six nests left,” Poncet says. That day in the wheelhouse, when Poncet and I spotted our first massive colony, we had left the west for the peninsula’s northeast tip.
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| Sea-worn stones form a path to beached and broken sea ice. Ice is
central to life along the 800-mile Antarctic Peninsula, which juts up
toward South America, but warming air and water are melting it on land
and sea. Keith Ladzinski LARGE IMAGE |
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Ice here takes endless forms, from squared-off tabular bergs the size of
small towns, to pinnacles and wedges with shooting spires and sloped
sides. But it's melting fast. Paul Nicklen LARGE IMAGE LARGE IMAGE |
| Warm water and warm air sculpted this iceberg. As its base melted, says glaciologist Richard Alley, plumes of fresh meltwater flowed up its flanks, pulling in warm seawater that carved deep grooves. As the top melted, the iceberg became lighter and the grooves rose out of the water. Paul Nicklen LARGE IMAGE |
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On tiny Paulet Island, thousands of penguins were perched
in rows up a rocky slope, evenly spaced, like an audience at an opera
house. We could see some wandering the remains of an old stone hut built
in 1903 by shipwrecked Swedish explorers, who survived a long Antarctic
winter by eating penguins. On an iceberg off our starboard beam, a
noisy cluster of penguins slipped and knocked about like wobbly bowling
pins. When I saw one glissade down polished ice, its flippers pulled
back in a skier’s tuck, then tumble into a trio of fellow birds, I
laughed out loud. Poncet just nodded.
Antarctica is not all death and chaos: Millions of Adélies still thrive around the continent, performing their unintentional comedy. But the western peninsula’s transformation is profound, and few have seen more of it unfold than Poncet. The world he once knew is unraveling. He speaks of the loss like a farm kid who has watched suburbia gobble the family homestead.
“All the things you used to experience, the places I went when I was a child—I took it for granted then,” Poncet says. “Now you realize it’s not ever going to be possible again.”
Much of Antarctica is a vast plateau, a high desolate desert of blowing snow where temperatures can plunge to minus 140°F. Poncet’s Antarctica isn’t like that at all.
The Antarctic Peninsula is longer than Italy and curls north toward the temperate zone. Its climate—for Antarctica—has always been mild. Summer temperatures often rise above freezing. Isolated patches of vegetation dot exposed granite and basalt. Adélie penguins live all along the coast of Antarctica, but the peninsula also supports species the harsh mainland can’t: fur seals, elephant seals, gentoo and chinstrap penguins. Petrels and sheathbills flit about the skies. All this life relies on the sea.
Antarctica is not all death and chaos: Millions of Adélies still thrive around the continent, performing their unintentional comedy. But the western peninsula’s transformation is profound, and few have seen more of it unfold than Poncet. The world he once knew is unraveling. He speaks of the loss like a farm kid who has watched suburbia gobble the family homestead.
“All the things you used to experience, the places I went when I was a child—I took it for granted then,” Poncet says. “Now you realize it’s not ever going to be possible again.”
Much of Antarctica is a vast plateau, a high desolate desert of blowing snow where temperatures can plunge to minus 140°F. Poncet’s Antarctica isn’t like that at all.
The Antarctic Peninsula is longer than Italy and curls north toward the temperate zone. Its climate—for Antarctica—has always been mild. Summer temperatures often rise above freezing. Isolated patches of vegetation dot exposed granite and basalt. Adélie penguins live all along the coast of Antarctica, but the peninsula also supports species the harsh mainland can’t: fur seals, elephant seals, gentoo and chinstrap penguins. Petrels and sheathbills flit about the skies. All this life relies on the sea.
On the rugged peninsula, Antarctica’s stillness is
punctuated by squawking and chattering and concentrated motion. It’s a
place of bizarre angles: Blue-white glaciers flow to the ocean and calve
into icebergs that assume every form imaginable. Bergs the size of
small towns reach into the clouds. Even dozens of miles away, you hear
them crack and explode like cannons.
It looks like wilderness, and it is, but it is not untouched. People began altering life in this region decades before anyone had even seen Antarctica. Not long after Capt. James Cook first cut through Antarctic waters in the 1770s, hunters started slaughtering fur seals by the millions, mostly for hats and coats. They also killed elephant seals for oil, to be used in paint and soap. The first to set foot on the continent were probably Connecticut seal hunters who came ashore briefly on the western peninsula in 1821.
In time whalers began harpooning sei whales, blues, fins, and humpbacks. They stripped baleen, or whalebone, from their mouths to make whips, umbrella ribs, corsets, and carriage springs and used the whale oil for heat, lamps, and margarine. In the early 20th century South Georgia became a whaling mecca. Leith Harbour was the last of its stations to close, in 1966.
See Antarctica like never before. The southernmost continent is otherworldly, beautiful, and dangerous. Hear National Geographic photographer Cristina Mittermeier describe her experience there.
The balmier water pulled from the deep even affects ice
on land, by attacking glaciers where they meet the sea as floating
shelves. At least 596 of the western peninsula’s 674 glaciers are in
retreat, according to a British survey. Elsewhere in Antarctica, far
larger ice shelves are thawing and crumbling, threatening a rapid rise
in global sea levels. On the east coast of the peninsula itself, ice has
been failing spectacularly too—a Delaware-size piece broke off the
Larsen C Ice Shelf just last year. But the east coast can still be five
degrees Fahrenheit cooler than the west. Prevailing winds often push sea
ice from the west around the tip of the peninsula to the east, where a
gyre traps it against land.
It looks like wilderness, and it is, but it is not untouched. People began altering life in this region decades before anyone had even seen Antarctica. Not long after Capt. James Cook first cut through Antarctic waters in the 1770s, hunters started slaughtering fur seals by the millions, mostly for hats and coats. They also killed elephant seals for oil, to be used in paint and soap. The first to set foot on the continent were probably Connecticut seal hunters who came ashore briefly on the western peninsula in 1821.
In time whalers began harpooning sei whales, blues, fins, and humpbacks. They stripped baleen, or whalebone, from their mouths to make whips, umbrella ribs, corsets, and carriage springs and used the whale oil for heat, lamps, and margarine. In the early 20th century South Georgia became a whaling mecca. Leith Harbour was the last of its stations to close, in 1966.
See Antarctica like never before. The southernmost continent is otherworldly, beautiful, and dangerous. Hear National Geographic photographer Cristina Mittermeier describe her experience there.
Climate change has since left an unmistakable mark.
Winter air on the western peninsula has warmed more than 10 degrees
Fahrenheit since the 1950s. Winds drive changes in ocean circulation
that bring warmer deep water toward the surface, helping to reduce sea
ice—the broken crust that forms when the ocean’s briny surface freezes.
Sea ice now appears later and disappears faster: The ice-free season on
the western peninsula lasts a full 90 days longer than in 1979. For a
Northern Hemisphere equivalent, imagine summer suddenly stretching to
Christmas.
The winter before Poncet was born, his parents spent weeks camping and exploring frozen Marguerite Bay, hauling gear by sledge across its solid surface. “Nowadays,” Poncet says, “that’s finished. Sea ice barely even forms.”
The loss of ice exposes warm water to the cold air, increasing evaporation, which returns to the world’s driest continent as snow—even rain. On a 2016 trip to Marguerite Bay, halfway down the west coast, Poncet faced a deluge that lasted almost a week. “Thirty years ago I don’t think anyone had ever seen a drop of water fall from the sky down there,” he says.
The winter before Poncet was born, his parents spent weeks camping and exploring frozen Marguerite Bay, hauling gear by sledge across its solid surface. “Nowadays,” Poncet says, “that’s finished. Sea ice barely even forms.”
The loss of ice exposes warm water to the cold air, increasing evaporation, which returns to the world’s driest continent as snow—even rain. On a 2016 trip to Marguerite Bay, halfway down the west coast, Poncet faced a deluge that lasted almost a week. “Thirty years ago I don’t think anyone had ever seen a drop of water fall from the sky down there,” he says.
The western peninsula is Antarctica’s hot spot. Often
depicted on maps in white, it’s now so warm that tufts of the
continent’s only native flowering plants, hair grass and yellow-flowered
pearlwort, are spreading. So are invasive grasses and lichens. Green
moss is growing three times as fast as it did in the past. Island peaks
once cloaked in snow are now wet and melting, exposing mud or yawning
crevasses.
“The landscape is shriveling,” Poncet says.
Hiking recently on the south shore of Elephant Island, off the tip of the peninsula, Poncet was flabbergasted by how temperate things seemed. The weather was humid, the landscape ice free, and enough grass had sprouted that it brought to mind a meadow.
“It didn’t feel like Antarctica at all,” he says.
Adélies are the peninsula’s only truly Antarctic penguin
species. (Chinstraps also live in South America; red-beaked gentoos
range from there to Africa.) They build nests of pebbles and return to
the same site each year at the same time, even if it’s raining or
snowing or ice is melting. They prefer dry rock or soil but now are
often forced to build on light snow—only to have nests collapse when the
snow melts or fill like ponds when it rains. Adélie eggs are drowning
in flooded nests. Drenched and windblown chicks are freezing to death;
they lack the moisture-repelling feathers that protect adults.
“The landscape is shriveling,” Poncet says.
Hiking recently on the south shore of Elephant Island, off the tip of the peninsula, Poncet was flabbergasted by how temperate things seemed. The weather was humid, the landscape ice free, and enough grass had sprouted that it brought to mind a meadow.
“It didn’t feel like Antarctica at all,” he says.
A heavy rain is falling as we depart the Hans Hansson
one morning on black rubber rafts, bound for a pebbly shore near the
Antarctic Sound, at the northern tip of the peninsula. On a rocky shelf
colored like a sunset by streaks of guano, we spy several muddy Adélie
penguins. One is a fledgling, whose gray, pillowy down is damp and
matted.
Adults, meanwhile, struggle with lost sea ice. Adélies
molt on floes far at sea and use ice as way stations to avoid predators
between hunts. They can swim for days but tend to dive only in the upper
few hundred feet of sea. As waters warm, more adaptable penguins are
pushing in. Gentoos—fat, tall generalists—are more flexible about when
and where they build nests and are more apt to lay new eggs if nesting
fails. They hunt closer to land and eat whatever is available. From 1982
to 2017, the number of breeding pairs of Adélies along the western
peninsula and South Shetland Islands dropped by more than 70 percent,
from 105,000 to 30,000. Gentoo pairs saw a sixfold increase, from 25,000
to 173,000.
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| A young blue-eyed shag attempts what may be its first dive near shore.
Many flying seabirds nest or feed along the Antarctic Peninsula. Cristina Mittermeier LARGE IMAGE |
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A skua bathes in a tide pool. Skuas prey on penguin eggs and chicks, fish, and krill. They also act as scavengers—the Antarctic equivalent of vultures, on constant cleanup duty in a place where carcasses don’t decompose because of the icy cold. Keith Ladzinski LARGE IMAGE |
| Scientists tracking how climate change is altering life for seabirds on
or near the Antarctic Peninsula, such as these blue-eyed shags, often
rely on early bird counts done in the 1980s by Dion Poncet’s parents. Keith Ladzinski LARGE IMAGE |
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Ice is essential to more than just Adélies. It’s as
central to this region as grass is to the savanna. When it disappears,
relationships can shift unpredictably. One morning near the Antarctic
Sound, Nicklen, photographer Keith Ladzinski, and I zip into dry suits
and go snorkeling near shore. We watch a skittish Adélie survey the
waves from a crumbling raft of ice. The bird seems hesitant to plunge
in—with good reason. A leopard seal is circling and occasionally nosing
onto the ice.
A leopard seal can weigh half as much as a small car. Its toothy jaws open wider than a grizzly bear’s. When closed, its mouth curves in a mischievous smile. That’s how the predator looks as it corkscrews around us—rakish, impatient, the king of its domain.
Suddenly, two more leopard seals appear. They turn in lazy laps, spiraling one after the other. Soon there are two more, their eyes locked on other penguins. One by one, the birds slip into the water, and the seals give chase. Some penguins turn and scamper back to ice and safety. Others aren’t so lucky. In an area not much bigger than two suburban backyards, five seals are soon feasting on penguins, shaking and shredding their bloody prey.
The show is mesmerizing—and “highly unusual,” Tracey Rogers, a leopard seal expert at the University of New South Wales, later tells me. Leopard seals, like grizzlies, are solitary creatures that usually stake out vast territories offshore. They need ice floes to rest on between hunts. Loss of ice from climate change is leading them to congregate near land, shifting how, where, and even what they hunt.
Get up close and personal with leopard seals in Antarctica and learn why they’re at the top of their food chain.
Leopard seals used to be rarely seen near fur seal breeding grounds. “Some sealers in the 1800s kept meticulous logs and records,” says Doug Krause, a wildlife biologist with the National Oceanic and Atmospheric Administration. “None of them reported seeing leopard seals hanging around.” Now, 60 to 80 leopard seals wriggle ashore every year at Cape Shirreff, in the South Shetlands. At the region’s largest fur-seal breeding ground, they kill more than half the newborn pups.
A leopard seal can weigh half as much as a small car. Its toothy jaws open wider than a grizzly bear’s. When closed, its mouth curves in a mischievous smile. That’s how the predator looks as it corkscrews around us—rakish, impatient, the king of its domain.
Suddenly, two more leopard seals appear. They turn in lazy laps, spiraling one after the other. Soon there are two more, their eyes locked on other penguins. One by one, the birds slip into the water, and the seals give chase. Some penguins turn and scamper back to ice and safety. Others aren’t so lucky. In an area not much bigger than two suburban backyards, five seals are soon feasting on penguins, shaking and shredding their bloody prey.
The show is mesmerizing—and “highly unusual,” Tracey Rogers, a leopard seal expert at the University of New South Wales, later tells me. Leopard seals, like grizzlies, are solitary creatures that usually stake out vast territories offshore. They need ice floes to rest on between hunts. Loss of ice from climate change is leading them to congregate near land, shifting how, where, and even what they hunt.
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A leopard seal nips at a young Adélie before dragging it deep and drowning it (top). These half-ton predators sometimes toy with penguins, catching them and then letting them go, only to wait and nab them again moments later. One of the curious predators comes in for a closer look at photographer Paul Nicklen (bottom). Paul Nicklen, Cristina Mittermeier LARGE IMAGE LARGE IMAGE |
| Crabeater seals slither onto floating ice to nap, give birth, or hide from killer whales or leopard seals. (Note the prominent scars.) With less sea ice available off the Antarctic Peninsula, icebergs like this one, calved from glaciers on land, provide critical resting places for animals. Despite their name, crabeaters feed mostly on shrimplike krill— another Antarctic staple whose future is in doubt. Cristina Mittermeier LARGE IMAGE |
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Get up close and personal with leopard seals in Antarctica and learn why they’re at the top of their food chain.
Leopard seals used to be rarely seen near fur seal breeding grounds. “Some sealers in the 1800s kept meticulous logs and records,” says Doug Krause, a wildlife biologist with the National Oceanic and Atmospheric Administration. “None of them reported seeing leopard seals hanging around.” Now, 60 to 80 leopard seals wriggle ashore every year at Cape Shirreff, in the South Shetlands. At the region’s largest fur-seal breeding ground, they kill more than half the newborn pups.
After commercial sealing stopped in Antarctica in the
1950s, fur seals started making a triumphant comeback. Scientists
thought they would adapt well to a warming climate. Now their numbers at
Cape Shirreff are declining 10 percent each year. “What we’re seeing is
extraordinary,” Krause says. “No one saw this coming.”
No one foresaw the good news either—the boom in humpback whales.
Starting in the early 20th century, industrial whalers drove most of Antarctica’s cetaceans nearly to extinction, and many species are still struggling. Blue whales, for example, are thought to have numbered about a quarter of a million around 1900; the population today is 5 percent of that. But Antarctic humpbacks are roaring back: Their population is rising by 7 to 10 percent a year. “They’re going bonkers!” Ari Friedlaender shouts as we dart across the water in an open skiff in the Palmer Archipelago, where we rendezvoused with him.
Friedlaender, a marine ecologist with the University of California at Santa Cruz and a National Geographic explorer, has been studying humpbacks off Antarctica since 2001, tracking how and where they move and feed. He has recorded them rolling and playing with one another and diving deeper than anyone expected. He’s seen them opening gashes in ice with their blowholes. For animals that can weigh up to 40 tons, all this requires a lot of energy—and for now, he says, climate change is making more fuel available.
Friedlaender saw his first sign of that on a cruise in May 2009. It was late fall, so he and his colleagues assumed the humpbacks would have long since left for their wintering grounds near Ecuador and Panama. Then an echo-sounder detected a blob of krill that spread for miles below the ship. “We woke the next day, and there were more whales than any of us had ever seen at any time, at any place on the planet,” says Friedlaender, who has also studied them off Alaska, California, and New England. They counted 306 humpbacks in a 10-mile stretch. “They were here because there was no ice.”
Starting in the early 20th century, industrial whalers drove most of Antarctica’s cetaceans nearly to extinction, and many species are still struggling. Blue whales, for example, are thought to have numbered about a quarter of a million around 1900; the population today is 5 percent of that. But Antarctic humpbacks are roaring back: Their population is rising by 7 to 10 percent a year. “They’re going bonkers!” Ari Friedlaender shouts as we dart across the water in an open skiff in the Palmer Archipelago, where we rendezvoused with him.
Friedlaender, a marine ecologist with the University of California at Santa Cruz and a National Geographic explorer, has been studying humpbacks off Antarctica since 2001, tracking how and where they move and feed. He has recorded them rolling and playing with one another and diving deeper than anyone expected. He’s seen them opening gashes in ice with their blowholes. For animals that can weigh up to 40 tons, all this requires a lot of energy—and for now, he says, climate change is making more fuel available.
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| A humpback whale displays its fluke before diving on a calm evening in
the Gerlache Strait. Humpbacks are thriving as shorter sea-ice seasons
give them more time and room to hunt krill. Paul Nicklen LARGE IMAGE |
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Several humpback whales spiral around a mass of krill (top), releasing bursts of air bubbles to corral their prey—which they then consume by lunging open-mouthed through the school. The photographers also encountered a dead humpback (bottom). While it's impossible to know what killed this particular animal, an increase in ship traffic has increased the risk of whales being struck. Paul Nicklen LARGE IMAGE LARGE IMAGE |
| Bones of blue whales still dot the peninsula’s coast—a stark reminder of how fast humans can upend the natural world. After more than a century of whaling, much of it along these shores, the blue whale population is 5 percent of what it once was. Keith Ladzinski LARGE IMAGE |
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Friedlaender saw his first sign of that on a cruise in May 2009. It was late fall, so he and his colleagues assumed the humpbacks would have long since left for their wintering grounds near Ecuador and Panama. Then an echo-sounder detected a blob of krill that spread for miles below the ship. “We woke the next day, and there were more whales than any of us had ever seen at any time, at any place on the planet,” says Friedlaender, who has also studied them off Alaska, California, and New England. They counted 306 humpbacks in a 10-mile stretch. “They were here because there was no ice.”
Humpbacks, he explains, used to leave Antarctica in late
March or early April, when sea ice closed in. Now they have many more
ice-free weeks with more open water in which to roam widely and feed on
krill. Those beady-eyed, translucent creatures are the size of a child’s
pinkie, but they travel in thick swarms that can stretch for miles,
with 78,000 or more in a single cubic yard. Humpbacks are sticking
around and fattening up on krill, and that’s fueling a population boom.
Female whales are producing calves every year. Lactating mothers have so
much strength they’re feeding newborns while pregnant. “That’s insane
for an animal that big,” Friedlaender says.
He pulls alongside a humpback and her calf, resting in brash ice. The skiff bobs as Friedlaender, like some ponytailed modern harpooner, raises a long shaft above his head. The business end holds a waterproof camera fitted with suction cups. Friedlaender steadies his quivering weapon, takes aim, then slaps the camera on the leviathan’s back. The surprised whale makes a sound like a wet snore. Both mother and calf dive.
“Felt like a great stick!” Friedlaender yells. For a day or two, until it falls off and floats to the surface to be retrieved, the camera will record a whale’s-eye view of the sea. Humpbacks fare far and deep with few natural competitors. But how well they fare now depends on us.
He pulls alongside a humpback and her calf, resting in brash ice. The skiff bobs as Friedlaender, like some ponytailed modern harpooner, raises a long shaft above his head. The business end holds a waterproof camera fitted with suction cups. Friedlaender steadies his quivering weapon, takes aim, then slaps the camera on the leviathan’s back. The surprised whale makes a sound like a wet snore. Both mother and calf dive.
“Felt like a great stick!” Friedlaender yells. For a day or two, until it falls off and floats to the surface to be retrieved, the camera will record a whale’s-eye view of the sea. Humpbacks fare far and deep with few natural competitors. But how well they fare now depends on us.
A few years ago, an icebreaker dragged research nets
around the Palmer Archipelago, looking for Antarctic silverfish—oily,
sardinelike creatures that spawn beneath sea ice. They used to be the
dominant fish off the western peninsula, composing half of what some
Adélie penguins ate. But the team, led by Joseph Torres of the
University of South Florida, towed day and night around Anvers and
Renaud Islands and never caught a single silverfish. In waters that have
experienced some of the greatest sea-ice declines, the fish had all but
disappeared. Meanwhile scientists noticed penguins gulping more
krill—even though it can take 20 krill to match the caloric value of one
silverfish.
Will there be enough krill to go around? It’s not an easy question. Penguins and humpbacks eat krill, but so do skuas, squid, fur seals, and crabeater seals. Leopard seals sometimes eat krill. A blue whale eats millions a day. Animals that don’t eat krill often feed on prey that does. Antarctica loves fatty krill. So do we.
In the 1960s, seeing a potential new seafood source, Soviet fleets began circling the continent. Today about 10 ships a year catch krill, led by Norway, South Korea, China, Chile, and Ukraine. The catch turns up in omega-3 pills and chewable krill-oil gummies and farmed salmon. In Ukraine peeled krill is sold in tins, like sardines. Sometimes krill gets processed at sea, boiled and dried into powder on huge trawlers.
Will there be enough krill to go around? It’s not an easy question. Penguins and humpbacks eat krill, but so do skuas, squid, fur seals, and crabeater seals. Leopard seals sometimes eat krill. A blue whale eats millions a day. Animals that don’t eat krill often feed on prey that does. Antarctica loves fatty krill. So do we.
In the 1960s, seeing a potential new seafood source, Soviet fleets began circling the continent. Today about 10 ships a year catch krill, led by Norway, South Korea, China, Chile, and Ukraine. The catch turns up in omega-3 pills and chewable krill-oil gummies and farmed salmon. In Ukraine peeled krill is sold in tins, like sardines. Sometimes krill gets processed at sea, boiled and dried into powder on huge trawlers.
| Translucent krill, about two inches long, are the centerpiece of the Antarctic food web. Fish, squid, penguins, seals, and whales all consume krill—and so do we. Ships from various countries come to Antarctica to net swarming krill by the billions, for use in dietary supplements or to feed farmed salmon and aquarium fish. Keith Ladzinski LARGE IMAGE |
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After almost a month at sea we finally see one, in the Bransfield Strait, off the South Shetlands. A storm rocks the 333-foot Long Da, a
Chinese mid-water factory trawler, as we pull along her stern. The
boat’s net courses through the water like a gape-mouthed whale shark. As
the crew haul it in, the net’s green mesh curls over itself, cocooning
millions of krill.
For now, krill around Antarctica remain abundant. Trawlers net only a tiny fraction of the continent’s krill. Fishing is tightly managed by 24 countries and the European Union, organized as the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). But krill populations are cyclical, and researchers can’t say how quickly or severely warming and loss of ice may affect them. “We measure krill and may think we understand it, but we don’t, really,” says Christian Reiss of NOAA Fisheries.
Many experts worry that krill boats could target and deplete krill on feeding grounds important for other wildlife. A team of U.S. government scientists in 2017 put it bluntly: “If predators and the fishery use the same population of krill, it follows that removal of krill by one group may limit the availability to the other.” Most fishing takes place where climate change has stressed animals the most—near the western peninsula. “Where is there also one of the greatest densities of predators?” Friedlaender asks. “Same place.”
National Geographic Photographer Paul Nicklen braves rough ocean waters and sub-zero temperatures to return to Antarctica and dive beneath the ice for a close-up encounter with a twelve-foot-long leopard seal.
For now, krill around Antarctica remain abundant. Trawlers net only a tiny fraction of the continent’s krill. Fishing is tightly managed by 24 countries and the European Union, organized as the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). But krill populations are cyclical, and researchers can’t say how quickly or severely warming and loss of ice may affect them. “We measure krill and may think we understand it, but we don’t, really,” says Christian Reiss of NOAA Fisheries.
Many experts worry that krill boats could target and deplete krill on feeding grounds important for other wildlife. A team of U.S. government scientists in 2017 put it bluntly: “If predators and the fishery use the same population of krill, it follows that removal of krill by one group may limit the availability to the other.” Most fishing takes place where climate change has stressed animals the most—near the western peninsula. “Where is there also one of the greatest densities of predators?” Friedlaender asks. “Same place.”
National Geographic Photographer Paul Nicklen braves rough ocean waters and sub-zero temperatures to return to Antarctica and dive beneath the ice for a close-up encounter with a twelve-foot-long leopard seal.
In 2017 Chile and Argentina proposed that CCAMLR place
thousands of square miles west and north of the peninsula off-limits to
krill fishing. Just this summer, environmental groups and Norway’s
AkerBioMarine, the largest krill-fishing company in the world, helped
persuade most others in the krill industry to avoid fishing near penguin
colonies during breeding periods next year. Starting in 2020, the
companies say, they will stay at least 30 kilometers, or 19 miles, from
penguin colonies year-round.
Many scientists and wildlife advocates maintain that permanent no-fishing zones regulated by CCAMLR are the safest solution. Otherwise, says Kim Bernard, an Oregon State University oceanographer who studies krill, “things could go very badly here. That really scares me.”
Many scientists and wildlife advocates maintain that permanent no-fishing zones regulated by CCAMLR are the safest solution. Otherwise, says Kim Bernard, an Oregon State University oceanographer who studies krill, “things could go very badly here. That really scares me.”
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| The sun sets on Booth Island, near the Lemaire Channel. Keith Ladzinski LARGE IMAGE |
One evening on the Hans Hansson, after a dinner of
lamb and potatoes, Poncet traces a map in the galley, pointing out
places he once chased krill with a butterfly net. It was common when he
was a child to see massive swarms at the surface, he says. “Sometimes
the engine would overheat because the water intakes were blocked with
krill,” Poncet recalls. Today “you almost never see them” in those
places.
Scientists take Poncet’s long experience seriously. “In a way, it’s traditional knowledge,” Bernard says. As Antarctica hurtles toward the unknown, scientific knowledge is still sparse.
This year Poncet abruptly sold the Hans Hansson. He says he and his companion, Juliet Hennequin—also an accomplished boat captain—were exhausted. But he also felt that too many visitors took the region’s bounty for granted, just as it was changing into a place he barely recognized. “When I take stock of the current situation, the Antarctic Peninsula I knew as a child has already largely gone,” he says. “I do wonder a lot what it will become.”
Links
Scientists take Poncet’s long experience seriously. “In a way, it’s traditional knowledge,” Bernard says. As Antarctica hurtles toward the unknown, scientific knowledge is still sparse.
This year Poncet abruptly sold the Hans Hansson. He says he and his companion, Juliet Hennequin—also an accomplished boat captain—were exhausted. But he also felt that too many visitors took the region’s bounty for granted, just as it was changing into a place he barely recognized. “When I take stock of the current situation, the Antarctic Peninsula I knew as a child has already largely gone,” he says. “I do wonder a lot what it will become.”
Links
- National Geographic Special Report: Antarctica
- The Larsen C Ice Shelf Collapse Is Just the Beginning—Antarctica Is Melting
- Antarctica Is Melting at a Dangerous Pace—Here's Why (video)
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