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Emperor penguins face a bleak future – but some colonies will do better than others in diverse sea-ice conditions
Sara Labrousse/French Polar Institute, CC BY-SA
Sara Labrousse, Sorbonne Université and Michelle LaRue, University of CanterburyThe long-term future looks bleak for Emperor penguins, but our new research shows some birds may be able to survive in certain conditions, depending on where they live, at least for the next few decades.
Over the past two years, Antarctic sea ice has declined dramatically, prompting scientists to suggest it could reach a “new state”.
A study based on satellite images shows that sea ice broke out early in Antarctica’s Bellingshausen Sea in 2022, potentially resulting in breeding failures across several Emperor penguin colonies in that region.
Our research shows Emperors form colonies in surprisingly diverse environmental conditions that vary depending on location around the continent. Within each of these regions, there is little difference between where birds make their homes and other sites, suggesting they could shift if they had to. This provides a ray of hope in an otherwise bleak outlook.
Emperor penguins may be the only birds to rarely set foot on land. They are unique among penguin species in that they breed on sea ice during the harsh Antarctic winter.
Male Emperor penguins incubate eggs and raise the chicks on sea ice during the Antarctic winter. Sara Labrousse/French Polar Institute, CC BY-SA
We know that they need “fast ice” – the coastal sea ice attached to the Antarctic continent or ice shelves. But they actually inhabit a range of fast-ice locations that differ in the timing of ice formation, how much ice forms and breaks, and even how close they get to other penguin species.
Depending on where they are along the Antarctic coast, Emperors make use of the habitat available to them. Their behaviour may be flexible enough to allow some colonies to cope better in a warming world.
Why fast ice is important
Emperor penguins rely on fast ice as a stable platform for their breeding season. Female Emperors lay their eggs and the males incubate them for about two and a half months.
Even though Antarctica’s sea ice is diminishing, this refers to a measure known as “sea ice extent”, which includes all sea ice covering the polar ocean, whether it is fast ice or drifting pack ice.
A decrease in sea ice extent is not necessary linearly linked to a drop in the area covered by fast ice (although the reverse is true).
If fast ice were to disappear, we would expect more than 90% of Emperor colonies to become functionally extinct by the end of the century. However, our study suggests that in the short to medium term, we should consider the differences in the penguins’ breeding habitats when we think about ways to protect them.
Emperors are unlikely to move far
By looking a little closer at different fast-ice habitats, we found Emperor penguins have certain preferences. The persistence of the ice (how long it lasts into the summer) was important because chicks had more time to develop their water-proof swimming feathers.
In some cases, being close to Adélie penguins made a difference. In other cases, Emperors preferred sites with shallow ocean depths below the colony.
Our results suggest that two of these habitat conditions support larger colonies: stable fast ice that lasts throughout the breeding season (with only small changes in the growth and retreat seasonal cycle) and a good balance between a fast-ice platform that is wide enough to raise chicks but close enough to the ocean to get food for them.
Emperor penguins need access to the ocean to feed their chicks during the breeding season. Sara Labrousse/French Polar Institute, CC BY-SAWe need further studies to clarify these links and the relationship between population size and habitat quality. In our study, we weren’t able to consider prey availability and there may be other factors that play an important role.
Previous research has already shown that Emperor penguins have limited capacity to disperse to find more suitable climate refuges. This is supported by the genetic partitioning among the penguin populations in different Antarctic regions we studied.
Emperors don’t easily move to other breeding sites, even if the conditions are better. Sara Labrousse/French Polar Institute, CC BY-SAProtecting penguin habitat
Climate change is currently one of the main pressures driving Emperor penguins closer to extinction.
However, the latest global assessment by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) clearly identified fishing activities as historic and current drivers of the erosion of marine biodiversity worldwide.
This is also true for Antarctica. While fishing pressure there is limited to a fraction of the global fishing fleet, some of the largest vessels target krill, a tiny shrimp-like crustacean consumed by many Antarctic predators, including Emperor penguins.
With climate models predicting further reductions in sea ice extent, new fishing grounds could open and amplify pressure on other Antarctic wildlife.
If we want to live in a world with Emperor penguins, the most important thing to do would be to cut greenhouse gas emissions steeply. Another key action could be to prevent fishing in areas where climate change will have the most impact.
In this respect, truly protected areas are one conservation tool at our disposal. Now that our research provides more detailed information about penguin habitats, we can begin the process of more careful planning for conservation.
The world’s largest marine protected area exists in the Ross Sea, which is home to about 25% of the world’s Emperor penguins. Lessons we learn from protection there could help mitigate future declines of Emperors around Antarctica.![]()
Sara Labrousse, Chercheuse en écologie polaire, Sorbonne Université and Michelle LaRue, Associate Professor in Conservation Biology, University of Canterbury
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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award is worth 8 million kronor, or about $1.2 million. Only two women have won the physics prize since it was first awarded in 1901: Marie Curie in 1903 and Maria Goeppert-Mayer in 1963. The prizes are always handed out on December 10, the anniversary of prize founder Alfred Nobel's death in 1896. A glance at the Nobel Prize for physics: Who won? Frenchman Serge Haroche of the College de France and Ecole Normale Superieure, Paris, and American David Wineland of the University of Colorado in Boulder. For what? The two were cited for inventing and developing methods for observing tiny quantum particles without destroying them. The significance? Their research has led to the construction of extremely precise clocks that could become the basis for a new standard of measuring time and helped scientists take the first steps toward building superfast computers. What they said? Haroche: "It's very overwhelming. ... At first I called my children. ... There are a lot of people in the world that deserve the prize so I tried to not to expect too much." Wineland: "It was certainly surprising, and kind of overwhelming right now...I feel like I got a lot smarter overnight. ... When they also told me that the prize was shared with a good friend, that was nice to hear, too." Source: Hindustan Times
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On Board The Planet Solar, Italy — Scanning the horizon on his solar-powered catamaran, Swiss electrical engineer Raphael Domjan counts down the hours to the completion of his record-breaking world tour. "The idea was not to perform a feat but an eco-adventure with the aim of passing on the message that change is possible," Domjan told AFP-TV as his boat furrowed through choppy waves from Italy's Elba Island to Corsica in France. Domjan began his journey from Monaco in September 2010 on the boat he built after seeing the effects of climate change on an Icelandic glacier, and he is due to complete it on May 4 when he returns to the Mediterranean port. "I realised climate change was real and I had to do something," he said. The 31-metre (102-foot) white Planetsolar, with 537 square metres of black solar panels mounted around a raised cockpit, cost 15 million euros to build, and the project only became possible after Domjan joined up with German businessman Immo Stroeher. Domjan, 40, and his crew, including a captain, a chief builder and a mechanic, are hoping that their exhausting but historic 600-day journey will herald a new era in eco-friendly travel, particularly in the tourism sector. After crossing the Atlantic and passing through the Panama Canal, they crossed the Pacific and returned to Europe via the Suez Canal. There were a few hiccups along the way, including a frustrating three-day wait off the coast of Australia when a storm blocked out the sun. "We have everything at our disposal: the know-how, technology, raw materials and renewable energy to become sustainable and protect the planet," said the engineer, a nature lover who is also a pilot, ambulance man and mountain guide. Planetsolar can produce up to 500 or 600 kiloWatts per hour in good weather -- enough to travel 300 kilometres (186 miles) when the battery is fully charged using engines no more powerful than those on a scooter. Everything on board is solar-powered: from the boat's engines and the on-board computers to the hot water and the light bulbs. "The boat wasn't easy to build, but we built it in a record time of year-and-a-half years," said Jens Langwasser, 28, the chief builder. "We had a lot of problems with finding the right panels, the right battery. It hasn't been easy. This is solar energy. You go on the road with storms, rain and all types of conditions. You never know what will happen." As the boat requires maximum sunlight to move, it had to sail as close as possible to the Equator and follow routes that constantly had to change, based on how much sunlight was forecast for any particular day. "Twice a day we get a bulletin with sunlight forecasts. Sometimes we have to slow down to go through a patch of clouds and find a sunny spot," said captain Erwann Le Rouzic, 40, an experienced sailor. Erwann said that despite all the frustrations he was thrilled about the implications of solar-powered travel. "Of course it only works in sunny areas and on some types of boat, and I'm not saying we'll see cargo ships becoming solar powered in 10 years, but now we know it works and there are a lot of possible uses," he said. Ibor, a resident of Calvi where the ship arrived on one of its final legs of the world tour, said he was impressed. "There's no two ways about it. This is the future. No doubt about it," he said. Raphael said he has managed to show to industrialists, businessmen and politicians that his were not just fantasies from the novels of Jules Verne such as "Around the World in 80 days", but feasible ideas. His first victory is already secure. As the Planetsolar was passing the Galapagos Islands, the government there decided to ban access to one of the archipelago's islands to all boats except for solar or electric-powered ones. Source: The Way I See It









