Topic: Environment
A large iceberg grounded near an emperor penguin colony in Antarctica. The iceberg blocked the penguins' access to food, leading to a significant decline in chick numbers.
In 2025, a team of researchers from the Korea Polar Research Institute studied the emperor penguin colony on Coulman Island in Antarctica. They found that the number of chicks in the colony decreased by about 69% compared to the previous year and the average count over the past few years.
The researchers suggested that a large iceberg, which grounded off the island between July 2025 and January 2026, was responsible for the decline. The iceberg blocked the penguins' access to open-water food sources, making it difficult for them to feed their chicks.
To study this phenomenon, Jeong-Hoon Kim and his colleagues conducted two aerial field surveys of the colony in November and December 2025. They counted 6,658 live chicks during these surveys. The researchers also used satellite imagery to track the movement of the iceberg and combined it with a detailed model of its shape.
The study found that the iceberg's steep southern face and grounded position increased the distance penguins needed to travel to forage from around 9.3 km in 2024 to approximately 14.9 km in 2025. This increased distance likely contributed to the reduced breeding success in 2025.
Why It Matters
This study is important because it shows how individual events, like an iceberg blocking a food source, can affect animal populations. It also highlights the importance of considering these events when studying broader trends and climate change.
Key Facts
- The number of chicks in the Coulman Island emperor penguin colony decreased by about 69% in 2025 compared to the previous year.
- A large iceberg, which grounded off the island between July 2025 and January 2026, was likely responsible for the decline.
- The iceberg blocked the penguins' access to open-water food sources, making it difficult for them to feed their chicks.
- Jeong-Hoon Kim and his colleagues conducted two aerial field surveys of the colony in November and December 2025.
- The study found that the iceberg's movement increased the distance penguins needed to travel to forage from around 9.3 km in 2024 to approximately 14.9 km in 2025.
Key Terms
- Iceberg
- A large chunk of ice that breaks off from a glacier or ice shelf and floats in the ocean.
- Emperor Penguin
- The largest species of penguin, found in Antarctica, which breeds on sea ice and feeds in open water.
Implications
This study is important because it shows how individual events, like an iceberg blocking a food source, can affect animal populations. It also highlights the importance of considering these events when studying broader trends and climate change.
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