Study Says: Ecosystem Recovery Takes Longer Than Previously Believed

The full recovery of ecological systems, following the most devastating extinction event of all time, took at least 30 million years, according to new research from the University of Bristol.

Ecological systems take considerably longer to recover from a devastating extinction event than previously considered. A recent study by a team of researchers at the University of Bristol, found that the full recovery of ecological systems, following the most devastating extinction event of all time, took at least 30 million years. The University press release says that at the end of the Permian, approximately 250 million years ago, a major extinction event killed over 90 per cent of life on earth, including insects, plants, marine animals, amphibians, and reptiles. The destruction spread through ecosystems around the world and communities were restructured and organisms were left struggling to recover. This was the nearest life ever came to being completely wiped out. Prior to this study the work that had been undertaken indicated that life bounced back quite quickly, but this was mostly in the form of ‘disaster taxa’ (opportunistic organisms that filled the empty ecospace left behind by the extinction), such as the hardy Lystrosaurus, a barrel-chested herbivorous animal, about the size of a pig. This recent study, that was conducted by Sarda Sahney and Professor Michael Benton at the University of Bristol and published in Proceedings of the Royal Society B this week, indicates that specialised animals forming complex ecosystems, with high biodiversity, complex food webs and a variety of niches, took much longer to recover. Sahney said: “Our research shows that after a major ecological crisis, recovery takes a very long time. So although we have not yet witnessed anything like the level of the extinction that occurred at the end of the Permian, we should nevertheless bear in mind that ecosystems take a very long time to fully recover.” The researchers examined the recovery of tetrapods – animals with a backbone and four legs, such as amphibians and reptile. What they found was that although globally tetrapods appeared to recover quickly, the dramatic restructuring that occurred at the community level was not permanent and communities did not recover numerically or ecologically until about 30 million years later. Professor Benton explained: “Diversity is most commonly assessed by tallying the number of taxa on a global scale, but these studies are subject to the vagaries of sampling. By examining well-preserved and well-studied faunas, the taxonomic and ecological recovery of communities after the Permian extinction event can be examined more accurately, and the problems of geological bias are largely avoided.” The Permian extinctions took place in three waves with the largest being at the boundary between the Permian and Triassic periods, 251 million years ago. This was the most devastating ecological event of all time, thought to be caused by large-scale volcanism in Russia which produced the ‘Siberian Traps’, covering over 200,000 square kilometers (77,000 square miles) in lava.