Penguin populations could drop 60 percent by the end of the century

Adelie penguins at risk
Credit: University of Delaware/Megan Cimino

ANTARCTICA - Climate has influenced the distribution patterns of Adélie penguins across Antarctica for millions of years.

The geologic record shows that as glaciers expanded and covered Adélie breeding habitats with ice, penguin colonies were abandoned. When the glaciers melted during warming periods, this warming positively affected the Adélie penguins, allowing them to return to their rocky breeding grounds.

But now, University of Delaware (UD) scientists and colleagues report that this beneficial warming may have reached its tipping point.

Adelie penguins, gentoo penguins, food and robots

University of Delaware researchers are working
to better understand foraging competition between
Adelie and Gentoo penguins.
Photo credit: Chris Linder

ANTARCTICA - For hundreds of years, Adélie penguins have been breeding in the West Antarctic Peninsula (WAP), which has recently become one of the most rapidly warming areas on Earth.

At Palmer Station, a US research base located along the WAP, scientists have been monitoring Adélie penguin population declines for decades. There were 15,000 breeding pairs of Adélie penguins in 1975; today only a few thousand pairs are left.

Now, in a study published in Scientific Reports, University of Delaware oceanographers consider whether Adélie penguins and gentoo penguins - newcomers to the Palmer Station region over the last two decades - may be competing for the same food resources and whether this might exacerbate the Adélie population decline.

Penguin chick weights connected to local weather conditions

Adelie penguin chicks in Antarctica
Credit: Megan Cimino/University of Delaware

ANTARCTICA - Adélie penguins are an indigenous species of the West Antarctic Peninsula (WAP), one of the most rapidly warming areas on Earth. Since 1950, the average annual temperature in the Antarctic Peninsula has increased 2°C on average, and 6°C during winter.

As the WAP climate warms, it is changing from a dry, polar system to a warmer, sub-polar system with more rain.

University of Delaware (UD) oceanographers recently reported a connection between local weather conditions and the weight of Adélie penguin chicks in an article in Marine Ecology Progress Series, a top marine ecology journal.