The Permian-Triassic mass extinction triggered the complete replacement of ecosystems. Here, foraminifers were studied including 173 species and 62 genera from South China. The authors propose “that foraminifera migrated to deeper water to avoid overheating and toxicity in shallow waters that were driven by the emplacement of the Siberian Traps and coeval volcanic activities around the Paleotethys Ocean.” More on the migration of Chinese foraminiferas is found here.