Ancient mystery on K’gari as world’s largest sand island lakes dried up during rainy era
Geological research on K'gari, the world's largest sand island, reveals that its lakes dried up 7,500 years ago despite a period of high rainfall. Scientists believe shifting wind patterns may have prevented moisture from replenishing the lakes during that era.
Why it matters
Understanding how ancient climate patterns affected water stability helps scientists predict how modern ecosystems might respond to changing environmental conditions.
K'gari, the world's largest sand island, is celebrated for its striking freshwater lakes. New research from the University of Adelaide, however, suggests that even the island's largest and deepest lakes may be vulnerable to disappearing under certain climate conditions.
By examining ancient layers of lake sediment, researchers uncovered evidence that several lakes dried out roughly 7,500 years ago. This period, known as the middle Holocene, came thousands of years after the last Ice Age and was generally wetter than today.
"Our research shows that about 7500 years ago, at a time of higher rainfall and long after the end of the last Ice Age, some of K'gari's deepest lakes dried out," says lead researcher Associate Professor John Tibby, from the University of Adelaide.
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