Amphibians face ‘terrifying’ rate of extinction
By Camila Ruz, www.guardian.co.uk
16 November 2011 If the current rapid extermination of animals, plants and other species really is the “sixth mass extinction”, then it is the amphibian branch of the tree of life that is undergoing the most drastic pruning. In research described as “terrifying” by an independent expert, scientists predict the future for frogs, toads, newts and salamanders is even more bleak than conservationists had realised. Around half of amphibian species are in decline, while a third are already threatened with extinction. But scientists now predict that areas with the highest diversity of amphibian species will be under the most intense threat in the future. And they warn that a three-pronged threat could also cause populations to decline faster than previously thought. Like many creatures, amphibians have been hit hard by climate change and habitat loss. But they have also been decimated by the spread of the deadly fungal disease chytridiomycosis. One in three of the world’s amphibians are on the International Union for Conservation of Nature’s red list of endangered species. These include the Malagasy rainbow frog that lives in the rocky forests of Madagascar. It has the ability to inflate itself when under attack and can climb vertical rock faces. Found in an area smaller than 100 square kilometres, it is a prime target for the pet trade. The Chinese giant salamander is also critically endangered. The largest of all amphibian species, it can grow to more than a metre long. Overexploitation for food has led to a catastrophic decline in the last 30 years. European species are also threatened. Scientists predict climate change, habitat destruction, and disease could drive more than half of all Europe’s frogs, toads and newts to extinction within 40 years. Now the largest study of its kind has found that it is in areas where amphibian diversity is at its highest that the greatest threat lies. Researchers led by Dr Christian Hof, from the University of Copenhagen, used computer modelling to predict the impact of climate change, the effect of habitat loss from urbanisation and farming and, finally, the fungal disease on amphibian populations. “What we found looking at climate change, for example, is that many tropical regions, such as northern South America, the Andes and parts of Africa, will be highly impacted,” said Hof. The team then compared this map of impact with the global distribution of more than 5,500 species of amphibians. The results, published in the journal Nature, show that two-thirds of the areas with the richest diversity of frog and salamander species will be affected by one or more of these threats by 2080. […]
