Red-necked Phalarope

Characterized as a delicate, highly specialized pelagic wader, this species is immediately recognized by its slender profile and needle-thin black bill. It measures between 18 and 19 cm in length, with a wingspan ranging from 31 to 34 cm and a body mass of 20 to 48 g. The taxon exhibits reversed sexual dimorphism, in which females display distinctly brighter coloration and larger body proportions than males. In breeding condition, the female features dark slate-gray upperparts, a crisp white throat, and an intense chestnut-red wash extending across the lateral and anterior margins of the neck. Non-breeding individuals transition to a subdued plumage dominated by pure white underparts, soft pale gray mantles with fine striping, and a prominent dark auricular smudge behind the eye. Its dark legs terminate in partially lobed toes, providing exceptional propulsion while swimming.

Geographical distribution: It maintains an extensive circumpolar breeding range across the high northern latitudes. Nesting populations are distributed through the subarctic zones of Alaska, northern Canada, coastal Greenland, Iceland, northern Fennoscandia, and across the vast Siberian tundra of Russia. In the non-breeding season, it undertakes long-distance pelagic migrations, gathering in major oceanic upwelling sectors such as the Humboldt Current off western South America, the Arabian Sea, the Gulf of Oman, and offshore zones near Indonesia and New Guinea.

Habitat: Breeding territories are strictly associated with low-arctic and subarctic wet tundra, sedge marshes, peat bogs, and shallow margins of freshwater or brackish tarns. Throughout migration and the boreal winter, the taxon shifts exclusively to marine pelagic realms, congregating along continental shelf breaks, thermal oceanic fronts, and nutrient-rich current convergences where biological productivity is exceptionally high.

Feeding: The diet is predominantly zoophagous, comprising diverse aquatic invertebrates and marine plankton. In pelagic wintering areas, it feeds intensively on marine copepods, euphausiids, amphipods, and larval stages of pelagic fish. In breeding wetlands, prey items shift toward terrestrial and freshwater organisms, including dipteran larvae (such as chironomids and culicids), aquatic beetles, caddisflies, and miniature gastropods.

Behavior: This bird is renowned for its unique feeding maneuver, wherein it swims in rapid, tight circles on the water´s surface to generate a hydrodynamic vortex. This spinning motion pulls microscopic prey from deeper layers directly up to the surface, where the bird rapidly pecks them with its slender bill. Highly pelagic outside the nesting season, it spends months resting and swimming on open ocean swells, forming vast, cohesive flocks.

Nesting: The reproductive framework is characterized by rare sequential polyandry, accompanied by full role reversal. Brightly colored females actively defend breeding territories and court cryptically colored males. The nest is a modest scrape concealed among grasses, mosses, or dwarf willows, lined with dry leaves. The clutch contains 4 pyriform eggs, cryptically marked with olive and dark brown blotches. Following oviposition, the female departs to seek additional mates, leaving the male solely responsible for the 17 to 21 days of incubation and the direct brooding of the precocial chicks until fledging at 18 to 20 days.

Conservation status: The species is currently classified under the category of Least Concern (LC) on the IUCN Red List of Threatened Species. While its global population remains large, localized declines may arise from ocean temperature shifts, disruption of planktonic food webs, pelagic oil spills, and high rates of plastic ingestion in open-sea wintering grounds.