LC
Wilson's Phalarope Steganopus tricolor



Family: Scolopacidae (Sandpipers, Snipes, Phalaropes)

Authority: (Vieillot, 1819)

Red List Category

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Justification of Red List category

This species has a large geographic range size (extent of occurrence >9 million km2 in both the breeding and non-breeding seasons), and so does not approach Criterion B thresholds. It also has a large estimated population size (1,500,000 mature individuals; Partners in Flight 2023), and so does not approach Criteria C or D thresholds. Considering its population trend over three generations (c. 10 years), the data presented in Smith et al. (2023) indicate a small increase of c. 6%, albeit with wide confidence intervals. This is broadly consistent with the c. 14% increase recorded by the Breeding Bird Survey (Ziolkowski et al. 2022). Data from Partners in Flight (2023) suggest that the population may have declined by c. 4%, again with wide confidence intervals. Since the 1980s, declines have been noted at some of the salt lakes where this species congregates on passage, probably associated with drought, but evidence for overall population decrease is inconclusive (Colwell and Jehl 2020). As there is no evidence that the population is declining, it does not approach or meet the thresholds for listing under Criterion A. The species is therefore listed as Least Concern.



Population size: 1500000 mature individuals

Population trend: stable

Extent of occurrence (breeding/resident): 9,270,000 km2

Country endemic: no

Attributes
USFWS - Bird of Conservation Concern
Realm - Nearctic
Realm - Neotropical
Realm - Oceanian
Realm - Palearctic
Realm - Antarctic
IUCN System - Freshwater
IUCN System - Terrestrial
IUCN System - Marine

Recommended citation
BirdLife International (2024) Species factsheet: Wilson's Phalarope Steganopus tricolor. Downloaded from https://datazone.birdlife.org/species/factsheet/wilsons-phalarope-steganopus-tricolor on 21/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 21/11/2024.