LC
Surfbird Calidris virgata



Taxonomy

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2024 Least Concern
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status full migrant Forest dependency does not normally occur in forest
Land-mass type Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 1,550,000 km2 medium
Extent of Occurrence (non-breeding) 30,000,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 70000 mature individuals poor estimated 2009
Population trend decreasing - suspected -
Generation length 6.12 years - - -
Number of subpopulations 1 - - -
Percentage of mature individuals in largest subpopulation 100% - - -

Population justification: It has a relatively small estimated population size (70,000 mature individuals; Partners in Flight 2023), but this does not approach Criteria C or D thresholds.

Trend justification: Considering its population trend over three generations (c. 18 years), data from the Christmas Bird Count (Meehan et al. 2022) indicate a decline of c. 23% (albeit with wide confidence intervals), although the underlying interannual trend data suggest the population has fluctuated over the last decade, following a long-term decline. Over the same period, Partners in Flight (2023) reports a decline of c. 11% (albeit with large confidence intervals), and eBird also indicates a decline (Fink et al. 2023). Although the population has declined and may still be declining, it does not currently appear to be declining at a rate approaching Criterion A thresholds.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Argentina extant native
Canada extant native yes yes yes
Chile extant native
Colombia extant native yes
Costa Rica extant native yes
Ecuador extant native yes
El Salvador extant native
Falkland Islands (Malvinas) extant vagrant
Guatemala extant native yes
Honduras extant native yes
Mexico extant native
Panama extant native yes
Peru extant native yes
USA extant native yes yes yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Canada Barkley Sound
Canada White Islets and Wilson Creek
Costa Rica Nicoya Gulf mangroves and coastal areas
USA Homer Spit
USA Mendenhall Wetlands
USA Northern Montague Island

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Tundra suitable breeding
Marine Intertidal Rocky Shoreline major non-breeding
Marine Intertidal Tidepools major non-breeding
Rocky areas (eg. inland cliffs, mountain peaks) major breeding
Altitude 0 - 1800 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Pollution Industrial & military effluents - Oil spills Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) Unknown Past Impact
Stresses
Species disturbance, Ecosystem degradation, Species mortality
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Species disturbance, Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2024) Species factsheet: Surfbird Calidris virgata. Downloaded from https://datazone.birdlife.org/species/factsheet/surfbird-calidris-virgata on 24/12/2024.
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 24/12/2024.