• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: #http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls#.
Cramp, S. and Simmons, K.E.L. (eds). 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.
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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2018	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

Migratory status	full migrant	Forest dependency	Medium
Land mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	16,900,000
Extent of Occurrence non-breeding (km2)	21,400,000
Number of locations		-
Fragmentation		-

	Estimate	Data quality	Derivation	Year of estimate
No. of mature individuals		poor	estimated	2011
Population trend	Increasing		estimated	-
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)	8.1	-	-	-

Population justification: The European population is estimated at 800-900 pairs, which equates to 1,600-1,800 mature individuals (BirdLife International 2015). However Europe represents <5% of the global range. Wetlands International (2018) estimate the population at 205,500-257,800 individuals, rounded here to 205,000-258,00 individuals.

Trend justification: This species has undergone a large and statistically significant increase over the last 40 years in North America (171% increase over 40 years, equating to a 28.3% increase per decade; data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007). The European population trend is unknown (BirdLife International 2015).

Country/Territory	Occurrence status	Presence	Resident	Breeding	Non-breeding	Passage
Canada	N	Extant			Yes	Yes
Czech Republic	V	Extant
Faroe Islands (to Denmark)	V	Extant
France	V	Extant
Germany	V	Extant
Greenland (to Denmark)	N	Possibly Extinct		Yes
Iceland	N	Extant	Yes
Montenegro	V	Extant
Norway	V	Extant
Russia	V	Extant
Russia (European)	V	Extant
Serbia	V	Extant
South Korea	V	Extant
Spain	V	Extant
Svalbard and Jan Mayen Islands (to Norway)	V	Extant
United Kingdom	V	Extant
USA	N	Extant		Yes

Country/Territory	IBA Name
Canada	English Bay and Burrard Inlet
Iceland	Apavatn-Laugarvatn
Iceland	Brúará
Iceland	Mývatn-Laxá
Iceland	Sog
Iceland	Veidivötn
USA	Glacier Bay & Icy Strait
USA	Prince William Sound

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Boreal	suitable	breeding
Forest	Temperate	suitable	breeding
Marine Coastal/Supratidal	Coastal Brackish/Saline Lagoons/Marine Lakes	suitable	non-breeding
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	major	non-breeding
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	major	breeding
Altitude	0 - 3000 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion, Reduced reproductive success
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Reduced reproductive success, Species mortality
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Salvelinus fontinalis	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Pollution	Industrial & military effluents - Oil spills	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Indirect ecosystem effects, Species mortality

Purpose	Primary form used	Life stage used	Source	Scale	Level	Timing
Food (human)	Whole	Eggs	Wild		Non-trivial	Recent
Food - human	-	-			Non-trivial	Recent
Pets	Whole	Adults and juveniles	Wild	International	Non-trivial	Recent
Pets/display animals, horticulture	-	-		International	Non-trivial	Recent

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Recommended citation
BirdLife International (2019) Species factsheet: Bucephala islandica. Downloaded from http://www.birdlife.org on 25/05/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/05/2019.