little auk

little auk. The little auk, or dovekie, is a small, stocky seabird of the auk family and the sole member of the genus Alle. It breeds in vast colonies on Arctic islands and forages in the cold, productive waters of the North Atlantic Ocean and adjacent seas. This highly pelagic bird is a crucial component of the High Arctic ecosystem and a key prey species for predators like the Arctic fox and glaucous gull.

Description and taxonomy

The little auk is a diminutive, black-and-white bird, first formally described by Carl Linnaeus in his seminal 1758 work Systema Naturae. It is placed in the auk family, Alcidae, and is most closely related to the extinct great auk, though it is significantly smaller. Its plumage is predominantly black on the head, neck, and back, contrasting sharply with a white underside, and it develops a distinctive dark throat patch in winter. The species exhibits slight size variation across its range, with the larger nominate subspecies, Alle alle alle, breeding in the eastern Atlantic and the smaller Alle alle polaris inhabiting regions around Svalbard and Franz Josef Land.

Distribution and habitat

The little auk is a bird of the high latitudes, with a circumpolar breeding distribution centered on the Arctic. Major breeding colonies are found on islands such as Greenland, Svalbard, Novaya Zemlya, and Franz Josef Land. During the breeding season, it nests on steep, rocky talus slopes and screes in mountainous coastal areas. Outside of summer, it becomes entirely pelagic, dispersing across the cold waters of the North Atlantic Ocean, the Greenland Sea, the Barents Sea, and occasionally venturing as far south as the United Kingdom and New England during harsh winters.

Behavior and ecology

Little auks are highly social and gregarious, forming immense, noisy colonies that can contain hundreds of thousands of pairs during the breeding season. They exhibit strong site fidelity, often returning to the same nesting crevice year after year. Their flight is characteristically fast and direct, with rapid wingbeats, and they are adept swimmers, using their wings for propulsion underwater in a form of aquatic flight. Key predators at colonies include the Arctic fox, polar bear, and various gull species like the glaucous gull and Iceland gull, while at sea they may be hunted by Greenland shark and marine mammals.

Diet and foraging

The diet of the little auk is primarily composed of zooplankton, especially cold-water copepods of the genus Calanus, particularly the lipid-rich Calanus finmarchicus and Calanus glacialis. They forage in areas of high marine productivity, often associated with the marginal ice zone and oceanic fronts, where upwelling concentrates prey. Feeding dives are typically shallow, utilizing wing-propelled pursuit diving to capture prey individually. This specialized diet makes them important bio-transporters of nutrients from the marine environment to the nutrient-poor terrestrial Arctic ecosystems via their guano.

Conservation status

The little auk is currently classified as Least Concern by the International Union for Conservation of Nature due to its extremely large population and range. However, it faces growing threats from climate change, which is rapidly altering its Arctic breeding habitat and affecting the distribution and abundance of its key copepod prey. Other potential risks include increased disturbance from shipping and oil exploration in the Arctic Ocean, as well as the threat of oil spills in its pelagic feeding grounds. Long-term monitoring programs, such as those conducted by the Norwegian Polar Institute, are essential for tracking population trends.

Category:Alcidae Category:Birds of the Arctic