Monday, January 8, 2024

Lost History of Antarctica

 From Science:

Some 100,000 years ago, scientists believe Antarctica’s massive western ice sheet collapsed, temporarily opening waterways between a trio of seas surrounding the continent. New evidence for that scenario comes from a surprising source: octopus DNA. The ice sheet’s collapse allowed long-separated populations of Turquet’s octopus (Pareledone turqueti) to interbreed for thousands of years; when the sheet reformed, the animals were isolated once more, a story that has been recorded in the sea creatures’ genes, researchers report today in Science. The work also bolsters concerns that a large rise in sea level may be in our planet’s near future.

“It’s a really creative approach” to uncovering Antarctica’s lost history, says Andrea Dutton, a geologist at the University of Wisconsin-Madison who studies ancient sea levels but was not involved in the study. (Read more.)

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