Ice Age Megafauna Extinctions Driven by Too Much Moisture
Research led by the Australian Centre for Ancient DNA (ACAD) at the University of Adelaide, published today in Nature Ecology and Evolution, has revealed that the ancient bones preserve direct biochemical evidence of the environmental upheavals, which can be traced through time.
Using 511 radiocarbon dated bones from animals such as bison, horse, and llamas the team was able to investigate the role of environmental change in the mysterious megafaunal extinctions, which claimed the vast majority of existing large land animals such as giant sloths and sabre-toothed cats.
The international team of researchers, including the University of Alaska Fairbanks, University of Oslo, the Yukon Government, and palaeontologists across Russia and Canada, measured nitrogen isotopes preserved in dated ancient animal bones and teeth recovered from permafrost areas and caves across Europe, Siberia, North and South America. They found distinctive biochemical signals reflecting massive increases of moisture on the landscape.
“Grassland megafauna were critical to the food chains. They acted like giant pumps that shifted nutrients around the landscape”, says lead author Dr Tim Rabanus-Wallace, from the University of Adelaide. “When the moisture influx pushed forests and tundras to replace the grasslands, the ecosystem collapsed and took many of the megafauna with it.”
Professor Matthew Wooller, of the University of Alaska Fairbanks, says: “We find that on different continents the climate changes happened at different times, but they all showed that moisture increased massively just prior to extinction. The really elegant feature of this study is that it produces direct evidence from the fossils themselves – these extinct creatures are informing us about the climate they experienced leading up to their own extinctions.”
Professor Alan Cooper
Source: http://www.ineffableisland.com/2017/04/ice-age-megafauna-extinctions-driven-by.html
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