Volcanoes saw species survive ice ages

Volcanoes saw species  survive ice ages
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The steam and heat from volcanoes allowed species of plants and animals to survive past ice ages, a study showed on Tuesday, offering help for scientists dealing with climate change.
An international team of researchers said their analysis helped explain a long-running mystery about how some species thrived, often in isolation, in areas covered by glaciers, with volcanoes acting as an oasis of life during long cold periods.
“Volcanic steam can melt large ice caves under the glaciers, and it can be tens of degrees warmer in there than outside,” said the Australian National University joint team leader Ceridwen Fraser.
“Caves and warm steam fields would have been great places for species to hang out during ice ages. We can learn a lot from looking at the impacts of past climate change as we try to deal with the accelerated change that humans are now causing.” The team studied tens of thousands of records of Antarctic mosses, lichens and bugs, collected over decades by hundreds of researchers and found there were more species close to volcanoes, and fewer further away.
While the study was based on Antarctica, the findings will also help scientists understand how species survived past ice ages in other frigid regions, including in periods when it is thought there was little or no ice-free land on the planet.
Antarctica has at least 16 volcanoes which have been active since the last ice age 20,000 years ago with around 60 percent of Antarctic invertebrate species found nowhere else in the world, largely due to the unique conditions that have allowed them to evolve.
“They have clearly not arrived on the continent recently, but must have been there for millions of years,” said Peter Convey from the British Antarctic Survey.
“How they survived past ice ages has long puzzled scientists.”  Aleks Terauds from the Australian Antarctic Division, which ran the analysis that was published by the US-based journal Proceedings of the National Academy of Sciences, said the closer researchers got to volcanoes, the more species were found. “This pattern supports our hypothesis that species have been expanding their ranges and gradually moving out from volcanic areas since the last ice age,” he said. 

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