Volcanic gases, carbon dioxide, and UV-B rays made for a noxious combination for Permian life.
That explains much of the prehistoric carnage in the water, but what about on land? What types of terrestrial organisms died, and why? The fossil record there is much less clear.Researchers had previously dug up clues of some immense destruction. For instance, several parts of that ancient world were once covered with forests of great ferns. Both of these biomesaround the end of the Permian, suggesting that ground dwellers suffered worldwide.
But these scientists may have found a missing piece. In 2014, Liu collected samples from rocks under what is now southern Tibet. When he and his colleagues studied the rock closely, they found ancient grains of conjoined and misshapen pollen.Feng Lui “I think the key thing is that we have definite evidence that plants were affected by this,” says Jardine. “The increase in UV-B-absorbing compounds that we have observed shows that plants were biochemically responding to this situation.”
“Whilst it would be pre-emptive of me to suggest ozone depletion or elevated UV radiation were the only cause of these mass extinctions, it certainly seems plausible that increasing UV radiation at a time when the global ecosystem is already under considerable stress is likely to exacerbate negative impacts on life on Earth,” says[Related:If UV-B really did make the planet more unlivable in that period, the devastation may have happened globally.
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