A new study reveals a significant loss of diversity during the Ediacaran Period, which lasted from 635 million to 540 million years ago. According to a new study conducted by Virginia Tech geobiologists, the cause of the first known mass extinction of animals was decreased global oxygen availabilit
Impressions of the Ediacaran fossils Dickinsonia with the smaller anchor-shaped Parvancorina in sandstone of the Ediacara Member from the Nilpena Ediacara National Park in South Australia. Credit: Scott Evans
Impressions of the Ediacaran fossils Dickinsonia and related but rare form Andiva in sandstone of the Ediacara Member from the Nilpena Ediacara National Park in South Australia. Credit: Scott Evans The study by Evans and Xiao is timelier than one would think. In an unconnected study, Virginia Tech scientists recently found that anoxia, the loss of oxygen availability, is affecting the world’s fresh waters. The cause? The warming of waters brought on by climate change and excess pollutant runoff from land use. Warming waters diminish freshwater’s capacity to hold oxygen, while the breakdown of nutrients in runoff by freshwater microbes gobbles up oxygen.
There are five known mass extinctions that stand out in the history of animals, the “Big Five,” according to Xiao, including the Ordovician-Silurian Extinction , the late Devonian Extinction , the Permian--Paleogene Extinction .
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