As we say goodbye to the sub-Antarctic skuas, we thought it only fair to give them an additional spot on our blog…

This blog focuses on the life cycle of the sub-Antarctic skuas, as well as the challenges and threats that these birds face

The life cycle of the sub-Antarctic skua

Sub-Antarctic skuas are migratory birds, meaning they spend much of their lives in the open sea, often near the Antarctic pack ice during the winter months. However, they return to their breeding grounds on the sub-Antarctic islands in the spring to mate and raise their chicks.

Their breeding cycle is fascinating. Skuas are monogamous during the breeding season, and they typically build their nests on the ground in the rocky, windswept landscapes of the islands. The female lays one or two eggs, which both parents take turns incubating. After about a month, the eggs hatch, and the parents fiercely protect their chicks from predators.

Their diet during the breeding season is highly varied. While they are known for their predatory behavior and may hunt other seabirds, they are also opportunistic feeders and will scavenge from other animals or even steal food from other birds. This behavior is what gives the skuas their reputation as fierce and aggressive predators.

Conservation challenges and threats

While the sub-Antarctic skua is not considered endangered at the moment, the species faces several threats that could jeopardize its future. These threats are particularly pronounced in their breeding habitats on the Prince Edward Islands and other remote locations:

Climate change: As global temperatures rise, sea ice in the Southern Ocean is shrinking, which affects the availability of prey. Since skuas rely on fish and smaller seabirds, any disruption to marine food chains can impact their populations.

Invasive species: On some of the sub-Antarctic islands, invasive species like rats, mice, and cats pose a threat to skuas’ nests and eggs. Conservation efforts are being put in place to eradicate these invasive species, but it remains an ongoing battle.

Human activity: While these remote islands are largely untouched by human development, there is still the threat of pollution, ship traffic, and even tourism. These activities can disrupt local ecosystems and disturb the delicate balance of nature that skuas depend on for breeding and feeding.

Farewell until next year, beautiful birds!