Rising temperatures and overfishing in the pristine(未受污染的) waters around the Antarctic could see king penguin populations pushed to the brink of extinction by the end of the century, according to a new study. The study's report states that as global warming transforms the environment in the world's last great wilderness, 70 percent of king penguins could either disappear or be forced to find new breeding grounds.
Co-author Celine Le Bohec, from the University of Strasbourg in France, warned: "If there're no actions aimed at halting or controlling global warming, and the pace of the current human-induced changes such as climate change and overfishing stays the same, the species may soon disappear." The findings come amid growing concern over the future of the Antarctic. Earlier this month a separate study found that a combination of climate change and industrial fishing is threatening the krill(磷虾) population in Antarctic waters, with a potentially disastrous impact on whales, seals and penguins. But today's report is the starkest warming yet of the potentially devastating impact of climate change and human exploitation on the Antarctic's delicate ecosystems.
Le Bohec said: "Unless current greenhouse gas emissions drop, 70 percent of king penguins -- 1.1 million breeding pairs -- will be forced to relocate their breeding grounds, or face extinction by 2100." King penguins are the second-largest type of penguin and only breed on specific isolated islands in the Southern Ocean where there is no ice cover and easy access to the sea. As the ocean warms, a body of water called the Antarctic Polar Front -- an upward movement of nutrient-rich sea that supports a huge abundance of marine life -- is being pushed further south. This means that king penguins, which feed on fish and kill in this body of water, have to travel further to their feeding grounds, leaving their hungry chicks for longer. And as the distance between their breeding, grounds and their fool prows, entire colonies could be wiped out.
Le Bohec said: "The plight of the king penguin should serve as a warming about the future of the entire marine environment in the Antarctic. Penguins, like other seabirds and marine mammals, occupy higher levels in the food chain and they are what we call bio-indicators of their ecosystems." Penguins are sensitive indicators of changes in marine ecosystems. As such, they are key species for understanding and predicting impacts of global change on Antarctic and sub-Antarctic marine ecosystems. The report found that although some king penguins may be able to relocate to new breeding grounds closer to their retreating food source, suitable new habitats would be scarce. Only a handful of islands in the Southern Ocean are suitable for sustaining large breeding colonies.
正确答案及解析
正确答案
51.A) King penguins in the Antarctic will be on the verge of dying out.
52.C) Industrial fishing and climate change could be fatal to certain Antarctic species.
53.D) The majority of them may have to find new breeding grounds in the future.
54.A) Many baby king penguins can't have food in time.
55.D) Only a few of its islands can serve as luge breeding grounds for king penguins.
解析
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