LC
Arctic Warbler Phylloscopus borealis



Taxonomy

Taxonomic note
Phylloscopus borealis , P. examinandus and P. xanthodryas (del Hoyo and Collar 2016) were previously lumped as P. borealis following AERC TAC (2003), AOU (1998 & supplements), Christidis & Boles (2008), Cramp et al. (1977-1994), Sibley & Monroe (1990, 1993) and Stotz et al. (1996).

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

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

Red List history
Year Category Criteria
2016 Least Concern
Species attributes

Migratory status full migrant Forest dependency Low
Land mass type Average mass 11 g
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 22,600,000 medium
Extent of Occurrence non-breeding (km2) 8,280,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 10000000-500000000 medium estimated 2015
Population trend Increasing suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 3.6 - - -

Population justification: In Europe, the breeding population is estimated to number 3,700,000-7,000,000 pairs, which equates to 7,400,000-14,000,000 mature individuals (BirdLife International 2015). It is likely that the global population falls into the range 10,000,000-500,000,000 mature individuals.

Trend justification: The population is suspected to be stable in the absence of evidence for any declines or substantial threats. The European population is estimated to be increasing (BirdLife International 2015).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Brunei N Extant Yes
Bulgaria V Extant
Cambodia N Extant Yes
China (mainland) N Extant Yes
Denmark V Extant
Faroe Islands (to Denmark) V Extant
Finland N Extant Yes
France V Extant
Germany V Extant
Gibraltar (to UK) V Extant
Greece V Extant
Hong Kong (China) N Extant Yes
India V Extant
Indonesia N Extant Yes
Ireland V Extant
Italy V Extant
Kazakhstan V Extant
Laos N Extant Yes
Luxembourg V Extant
Malaysia N Extant Yes
Malta V Extant
Mongolia N Extant Yes
Myanmar N Extant Yes
Netherlands V Extant
Norway N Extant Yes
Oman V Extant
Poland V Extant
Russia N Extant Yes
Russia (Central Asian) N Extant Yes
Russia (European) N Extant Yes
Saudi Arabia V Extant
Singapore N Extant Yes
Spain V Extant
Sweden N Extant Yes
Taiwan, China N Extant Yes
Tajikistan N Extant Yes
Thailand N Extant Yes
Timor-Leste N Extant Yes Yes
United Kingdom V Extant
USA N Extant Yes
Vietnam N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Sweden Vindel Mountains (including Lake Tärna)
Sweden Sjaunja
Finland Linnansaari
Finland Talaskangas
Finland Päätyeenlahti bay
Finland Koitajoki area
Finland Värtsilä valley
Finland Valtavaara-Pyhävaara
Finland Närängänvaara-Virmajoki-Romevaara
Finland Oulanka-Sukerijärvi
Finland Juortanansalo
Finland Elimyssalo
Finland Kemihaara (Vuotos) mires and forests
Finland Luosto
Finland Kevo
Finland Maltio fjelds
Finland Värriö-Tuntsa
Finland Pallas and Ylläs fjelds
Finland Saariselkä and Koilliskaira
Finland Lemmenjoki-Hammastunturi-Pulju
Finland Käsivarsi fjelds
Russia (European) Zaonezh'ye
Russia (European) Yugyd Va
Russia (European) Valley of Sysola river
Russia (European) Lapland Biosphere Reserve
Russia (European) Kivach Nature Reserve
Russia (European) Yamantau mountain
Russia (European) Verkhnevisherski mountain
Russia (European) Kumikushski wetland
Russia (European) Adovo-Chugrumski wetland
Russia (European) Iremel'ski mountain
Norway Øvre Pasvik
Russia (European) Druzhinnoe lake and its outskirts
Russia (Central Asian) Bystroistokskaya
Russia (Central Asian) Zapovednik "Denezhkin Kamen'"
Russia (Central Asian) Kileinoye bog
Russia (Central Asian) Basins of the Schuchya and Khadytayakha rivers
Russia (Central Asian) Dvuob'ye
Russia (Central Asian) Lower Ob'
Russia (Central Asian) Kondinskiye lakes
Russia (Central Asian) Flood-plain of the Tuy river
Russia (Central Asian) Vizhay river
Russia (Central Asian) Molebny Kamen' ridge
Russia (Central Asian) Poyasovy Kamen' ridge
Russia (Central Asian) Kataiginskiye bogs
Russia (Central Asian) Ust'-Ozerninskiye bogs
Russia (Central Asian) Vodorazdel'naya
Russia (Central Asian) Seketovo, Rakhtovo and Artevo lakes
Russia (Central Asian) East slope of the Northern Ural
Norway Øvre Anárjohka
Norway Reisa
Sweden Muddus

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable non-breeding
Artificial/Terrestrial Plantations suitable non-breeding
Artificial/Terrestrial Rural Gardens suitable non-breeding
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable non-breeding
Forest Boreal suitable breeding
Forest Subtropical/Tropical Dry suitable non-breeding
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable non-breeding
Forest Subtropical/Tropical Moist Lowland suitable non-breeding
Shrubland Boreal major breeding
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) suitable non-breeding
Altitude 0 - 2500 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

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - Non-trivial Recent

Recommended citation
BirdLife International (2020) Species factsheet: Phylloscopus borealis. Downloaded from http://www.birdlife.org on 28/11/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/11/2020.