World’s largest chinstrap penguin colony sees 63% decline in 14 years

Zavodovski Island, located in the South Sandwich Islands of Antarctica, once housed the largest chinstrap penguin colony in the world. However, over the past 14 years, the population of these birds has plummeted by 63%, dwindling from around 1.09 million to just 402,000 breeding pairs. The British Antarctic Survey (BAS) attributes this rapid decline to climate change and its impacts on the birds' food supply.

Chinstrap penguins primarily consume Antarctic krill, and as rising ocean temperatures cause krill to migrate southward into colder waters, the penguins struggle to adapt to the new habitats, leading to food scarcity. While researchers ruled out the volcanic eruption of Mount Curry in 2016 as the main cause of the decline, they attribute the trend to the broader warming of the Antarctic region, which has increased winter temperatures by 5 degrees Celsius above pre-industrial levels.

The decline in chinstrap penguins and their contrasting fortunes with the increasing macaroni penguin population highlights how environmental changes can impact different species in various ways.