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Permian dieoff: Animals faced brave new world

BROWN (US) — The mass extinction that ended the Permian Period 252 million years ago was disastrous for land-based animals, setting off a boom-and-bust period that lasted for 8 million years.

During the watershed moment in history, as much as 90 percent of ocean organisms were extinguished. The event ushered in a new order of marine species, some of which still exist today. But while it is known that land dwellers sustained major losses, the extent of extinction and the reshuffling afterward is less clear.

In a paper published in the journal Proceedings of the Royal Society B, researchers describe a specimen-by-specimen analysis in an effort to confirm that land-based vertebrates suffered catastrophic losses as the Permian drew to a close.

From the ashes, the survivors, a handful of genera labeled “disaster taxa,” were free to roam more or less unimpeded, with few competitors in their respective ecological niches. The lack of competition caused vicious boom-and-bust cycles in the ecosystems, as external forces wreaked magnified havoc on the tenuous links in the food web.

“It means the (terrestrial ecosystems) were more subject to greater risk of collapse because there were fewer links” in the food web, says Jessica Whiteside, assistant professor of geological sciences at Brown University and co-author on the paper.

The up-and-down cycles that marked land-based ecosystems’ erratic rebound were like “mini-extinction events and recoveries,” says Randall Irmis, co-author on the paper, assistant professor of geology and geophysics at the University of Utah and a curator of paleontology at the Natural History Museum of Utah.

The hypothesis, in essence, places ecosystems’ recovery post-Permian squarely on the repopulation and diversification of species, rather than on an outside event, such as a smoothing out of climate. The new work also mirrors the conclusions reached by Whiteside in a paper published last year in Geology.

In that study, she and a colleague argued that it took up to 10 million years after the end-Permian mass extinction for enough species to repopulate the ocean—restoring the food web—and for the marine ecosystem to stabilize.

“It really is the same pattern” with land-based ecosystems as marine environments, Whiteside says, adding that the same seems to hold true for plants.

Some studies have argued that continued volcanism following the end-Permian extinction kept ecosystems’ recovery at bay, but Whiteside and Irmis say there’s no physical evidence of such activity.

The researchers examined nearly 8,600 specimens from near the end of the Permian to the middle Triassic, roughly 260 million to 242 million years ago. The fossils came from sites in the southern Ural Mountains of Russia and from the Karoo Basin in South Africa. The specimen count and analysis indicated that approximately 78 percent of land-based vertebrate genera perished in the end-Permian mass extinction.

Out of the rubble emerged just a few species, the disaster taxa. One of these was Lystrosaurus, a dicynodont synapsid (related to mammals) about the size of a German shepherd. This creature barely registered during the Permian but dominated the ecosystem following the end-Permian extinction, the fossil record shows.

Why Lystrosaurus survived the cataclysm when most others did not is a mystery—perhaps a combination of luck and the animal’s willingness to eat what was available and live just about anywhere. Similarly, a reptilian taxon, procolophonids, were mostly absent leading to the end-Permian extinction, yet exploded onto the scene afterward.

“Comparison with previous food-web modeling studies suggests this low diversity and prevalence of just a few taxa meant that links in the food web were few, causing instability in the ecosystem and making it susceptible to boom-bust cycles and further extinction,” Whiteside says.

The ecosystems that emerged from the extinction had such low animal diversity that it was especially vulnerable to crashes spawned by environmental and other changes, the authors write.

Only after species richness and evenness had been re-established, restoring enough population numbers and redundancy to the food web, did the terrestrial ecosystem fully recover. At that point, the carbon cycle, which is a broad indicator of life and death as well as the effect of outside influences, stabilized, according to data from previous studies of carbon isotopes spanning the Permian and Triassic periods, Whiteside says.

“These results are consistent with the idea that the fluctuating carbon cycle reflects the unstable ecosystems in the aftermath of the extinction event.”

The National Science Foundation and the University of Utah funded the work.

More news from Brown University: http://news.brown.edu

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