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Magellanic penguin at Punta Tombo showing its metal band. Credit: Dee Boersma |
ARGENTINA – Biologists of all stripes attest to evolution, but have debated its details since Darwin’s day. Since changes arise and take hold slowly over many generations, it is daunting to track this process in real time for long-lived creatures.
“We know that evolution occurs – that species change,” said Dee Boersma, a
University of Washington (UW) professor of biology.
“But to see this process in long-lived animals you have to look at generations of individuals, track how traits are inherited and detect selection at work.”
Boersma studies one particularly intriguing long-lived species, the
Magellanic penguins of South America. She has spent 34 years gathering information about their lifespan, reproduction and behaviour at Punta Tombo, a stretch of Argentine coast that serves as their largest breeding site.
Boersma and her colleagues combed through 28 years’ worth of penguin data to search for signs that natural selection – one of the main drivers of evolution – may be acting on certain penguin traits. As they report in a paper published on 21 September in
The Auk: Ornithological Advances, selection is indeed at work at Punta Tombo.