Data Zone
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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2016 | Least Concern |
| Migratory status | full migrant | Forest dependency | low |
| Land-mass type | Average mass | 11 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 22,600,000 | medium |
| Extent of Occurrence non-breeding (km2) | 8,280,000 | medium |
| Severely fragmented? | no | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Number of mature individuals | 10000000-500000000 | medium | estimated | 2015 |
| Population trend | increasing | suspected | - | |
| Generation length (years) | 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 | Presence | Origin | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Brunei | extant | native | yes | |||
| Bulgaria | extant | vagrant | ||||
| Cambodia | extant | native | yes | |||
| China (mainland) | extant | native | yes | |||
| Denmark | extant | vagrant | ||||
| Faroe Islands (to Denmark) | extant | vagrant | ||||
| Finland | extant | native | yes | |||
| France | extant | vagrant | ||||
| Germany | extant | vagrant | ||||
| Gibraltar (to UK) | extant | vagrant | ||||
| Greece | extant | vagrant | ||||
| Hong Kong (China) | extant | native | yes | |||
| India | extant | vagrant | ||||
| Indonesia | extant | native | yes | |||
| Ireland | extant | vagrant | ||||
| Italy | extant | vagrant | ||||
| Kazakhstan | extant | vagrant | ||||
| Laos | extant | native | yes | |||
| Luxembourg | extant | vagrant | ||||
| Malaysia | extant | native | yes | |||
| Malta | extant | vagrant | ||||
| Mongolia | extant | native | yes | |||
| Myanmar | extant | native | yes | |||
| Netherlands | extant | vagrant | ||||
| Norway | extant | native | yes | |||
| Oman | extant | vagrant | ||||
| Poland | extant | vagrant | ||||
| Russia | extant | native | yes | |||
| Russia (Central Asian) | extant | native | yes | |||
| Russia (European) | extant | native | yes | |||
| Saudi Arabia | extant | vagrant | ||||
| Singapore | extant | native | yes | |||
| Spain | extant | vagrant | ||||
| Sweden | extant | native | yes | |||
| Taiwan, China | extant | native | yes | |||
| Tajikistan | extant | native | yes | |||
| Thailand | extant | native | yes | |||
| Timor-Leste | extant | native | yes | yes | ||
| United Kingdom | extant | vagrant | ||||
| USA | extant | native | yes | |||
| Vietnam | extant | native | yes |
| 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 |
| 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 | ||||||
|
|||||||||
| Purpose | Primary form used | Life stage used | Source | Scale | Level | Timing |
|---|---|---|---|---|---|---|
| Pets/display animals, horticulture | - | - | non-trivial | recent |
Recommended citation
BirdLife International (2023) Species factsheet: Phylloscopus borealis. Downloaded from
http://datazone.birdlife.org/species/factsheet/arctic-warbler-phylloscopus-borealis on 28/09/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://datazone.birdlife.org on 28/09/2023.
