Antarctica's penguins in peril as climate warms: WWF
New York (PTI): Antarctica's penguin population is facing a threat of extinction due to global warming. This inference can be drawn from a World Wildlife Fund report.
According to the report, the four species of penguins that breed on the Antarctic continent -- Chinstrap, Emperor, Adlie and Gentoo -- are under escalating pressure because global warming is taking away precious ground on which they raise their young, the 'ScienceDaily' said on Sunday.
Moreover, food has become increasingly scarce because of climate change and overfishing.
"The Antarctic penguins already have a long march behind them. Now it seems these icons of the Antarctic will have to face an extremely tough battle to adapt to the unprecedented rate of climate change," Deputy Director of WWF's Global Climate Change Programme Anna Reynolds said.
The Antarctic Peninsula is warming five times faster than the average rate of global warming. The vast Southern Ocean has warmed all the way down to a depth of 3,000 metres.
Sea ice -- ice that forms from sea water -- covers 40 per cent less area than it did 26 years ago off the West Antarctic Peninsula. This decrease has led to reduced numbers of krill, the main source of food for Chinstrap penguins, according to the report.
The number of Chinstraps decreased by as much as 30 per cent to 66 per cent in some colonies, as less food has made it more difficult for the young to survive. It's the same story for Gentoo penguins, who are increasingly dependent on the declining krill stocks as overfishing kills off their usual food sources.
The Emperor penguin, the largest and most majestic penguin in the world, has seen some of its colonies halved in size over the past half century. Warmer winter temperatures and stronger winds mean that the penguins have to raise their chicks on increasingly thinner sea ice.
For many years, sea ice has broken off early and many eggs and chicks have been blown away before they were ready to survive on their own.
In the northwestern coast of the Antarctic Peninsula, where warming has been the most dramatic, populations of Adlie penguins have dropped by 65 per cent over the past 25 years. Not only has food become scarcer with the disappearance of sea ice, but the Adlies' warm-loving cousins, the Gentoos and Chinstraps, have also "invaded" the region, the WWF said.
Warmer temperatures mean that the atmosphere can hold more moisture, which in turn brings more snow. Scientists are worried for the Adlie penguin, which needs land that is free of snow and ice to raise their young, and is likely to lose out to its warm-loving cousins.
"The food web of Antarctica, and thus the survival of penguins and many other species, is bound up in the future of the sea ice. After such a long march to Bali, Ministers must now commit to sharp reductions in carbon emissions for industrialised countries, to protect Antarctica and safeguard the health of the planet," Jame Leape, the Director-General of WWF International, was quoted as saying.
Sci. & Tech.
