The study's findings show mergansers arrived in the New Zealand region at least seven million years ago from the Northern Hemisphere, in a separate colonisation event to that which led to the Brazilian merganser.
"There is not even a deep-time fossil record of these birds in the Southern Hemisphere," Associate Professor Rawlence says. The collaborative research, which also involved scientists from Manaaki Whenua Landcare Research, the Museum of New Zealand Te Papa Tongarewa, and the University of Adelaide, used state-of-the-art ancient DNA techniques to extract the DNA from historical specimens of the extinct Auckland Island merganser and the critically endangered Brazilian merganser and"went fishing for their DNA."
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