Researchers studying Adelie penguins – the most common species of penguin in Antarctica – have produced a study suggesting global warming may actually be good for the species.
‘For penguins, swimming is a whopping four times faster than walking,’ lead researcher Yuuki Watanabe at the National Institute of Polar Research said.AdvertisementIn recent decades, Antarctica has experienced a steady increase in the extent of its sea ice, even as the Arctic has suffered through a marked decrease, researchers say.
Polar biologists have known for some time that Adelie penguins tend to see population increases during years of sparse sea ice and suffer massive breeding failures in the years with the greatest growth of sea ice.Researchers with Japan’s National Institute of Polar Research electronically tagged 175 penguins with GPS devices, accelerometers and video cameras across four seasons with different sea ice conditions.
But when there is less sea ice, the birds can dive anywhere they want, often just entering the water right by their nests.Scientists say this is more energy and time efficient and it expands their foraging range. The study published in Science Advances covered the breeding seasons in 2010/11, 2011/12, 2012/13 and 2016/17.The researchers found that the penguins may have expended an average of 15% to 33% less energy per trip compared with ice-covered seasons, putting that saved energy into growth and reproduction.Two years ago, a previously hidden colony of Adelie penguins was discovered living on remote islands on the coast of Antarctica.
Source: Energy Industry News (energyindustrynews.net)
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