Data Zone
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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| 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) | 82,100,000 | medium |
| Extent of Occurrence non-breeding (km2) | 100,000,000 | medium |
| Number of locations | - | |
| Fragmentation | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | poor | estimated | 2012 | |
| Population trend | Unknown | not applicable | - | |
| 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) | 7.3 | - | - | - |
Population justification: The global population is estimated to number c.1,700,000-2,400,000 individuals (Wetlands International 2015). The European population is estimated at 66,800-103,000 pairs, which equates to 134,000-206,000 mature individuals (BirdLife International 2015).
Trend justification: The overall population trend is not known, although some populations are increasing, some decreasing, some stable and others have unknown trends (Wetlands International 2015). In Europe the population size is estimated to be stable (BirdLife International 2015). This species has undergone a small or statistically insignificant increase over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Afghanistan | N | Extant | Yes | |||
| Albania | N | Extant | Yes | |||
| Algeria | V | Extant | ||||
| Austria | N | Extant | Yes | |||
| Azerbaijan | N | Extant | Yes | |||
| Bangladesh | N | Extant | ||||
| Belarus | N | Extant | Yes | Yes | ||
| Belgium | N | Extant | Yes | |||
| Bermuda (to UK) | N | Extant | ||||
| Bhutan | N | Extant | ||||
| Bosnia and Herzegovina | N | Extinct | Yes | |||
| Bulgaria | N | Extant | Yes | |||
| Canada | N | Extant | Yes | Yes | ||
| China (mainland) | N | Extant | ||||
| Croatia | N | Extant | Yes | |||
| Cyprus | V | Extant | ||||
| Czech Republic | N | Extant | Yes | |||
| Denmark | N | Extant | Yes | |||
| Estonia | N | Extant | Yes | Yes | ||
| Finland | N | Extant | Yes | Yes | ||
| France | N | Extant | Yes | Yes | ||
| Germany | N | Extant | Yes | Yes | ||
| Greece | N | Extant | Yes | |||
| Greenland (to Denmark) | V | Extant | ||||
| Hungary | N | Extant | Yes | |||
| Iceland | N | Extant | Yes | |||
| India | N | Extant | ||||
| Iran, Islamic Republic of | N | Extant | Yes | |||
| Iraq | N | Extant | Yes | |||
| Ireland | N | Extant | Yes | |||
| Israel | V | Extant | ||||
| Italy | N | Extant | Yes | |||
| Japan | N | Extant | ||||
| Kazakhstan | N | Extant | Yes | |||
| Kyrgyzstan | N | Extant | Yes | |||
| Latvia | N | Extant | Yes | Yes | ||
| Lebanon | N | Extant | ||||
| Liechtenstein | N | Extant | Yes | |||
| Lithuania | N | Extant | Yes | Yes | ||
| Luxembourg | N | Extant | Yes | |||
| Malta | V | Extant | ||||
| Mexico | N | Extant | ||||
| Moldova | N | Extant | ||||
| Mongolia | N | Extant | Yes | |||
| Montenegro | N | Extant | Yes | |||
| Morocco | V | Extant | ||||
| Myanmar | N | Extant | ||||
| Nepal | N | Extant | ||||
| Netherlands | N | Extant | Yes | |||
| North Korea | N | Extant | ||||
| North Macedonia | N | Extant | Yes | |||
| Norway | N | Extant | Yes | Yes | ||
| Pakistan | N | Extant | ||||
| Poland | N | Extant | Yes | Yes | ||
| Portugal | V | Extant | ||||
| Romania | N | Extant | Yes | Yes | ||
| Russia | N | Extant | Yes | Yes | Yes | |
| Russia (Asian) | N | Extant | Yes | |||
| Russia (Central Asian) | N | Extant | Yes | |||
| Russia (European) | N | Extant | Yes | Yes | ||
| Serbia | N | Extant | Yes | |||
| Slovakia | N | Extant | Yes | |||
| Slovenia | N | Extant | Yes | |||
| South Korea | N | Extant | ||||
| Spain | N | Extant | Yes | |||
| St Pierre and Miquelon (to France) | N | Extant | Yes | Yes | ||
| Svalbard and Jan Mayen Islands (to Norway) | V | Extant | ||||
| Sweden | N | Extant | Yes | Yes | ||
| Switzerland | N | Extant | Yes | |||
| Taiwan, China | N | Extant | ||||
| Tajikistan | N | Extant | Yes | |||
| Tunisia | V | Extant | ||||
| Turkey | N | Extant | Yes | |||
| Turkmenistan | N | Extant | ||||
| Ukraine | N | Extant | Yes | Yes | ||
| United Kingdom | N | Extant | Yes | |||
| USA | N | Extant | Yes | |||
| Uzbekistan | N | Extant | Yes |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Boreal | suitable | breeding |
| Forest | Temperate | suitable | breeding |
| Marine Neritic | Estuaries | suitable | non-breeding |
| Marine Neritic | Macroalgal/Kelp | suitable | non-breeding |
| Marine Neritic | Seagrass (Submerged) | suitable | non-breeding |
| Marine Neritic | Subtidal Loose Rock/pebble/gravel | suitable | non-breeding |
| Marine Neritic | Subtidal Rock and Rocky Reefs | suitable | non-breeding |
| Marine Neritic | Subtidal Sandy | suitable | non-breeding |
| Marine Neritic | Subtidal Sandy-Mud | suitable | non-breeding |
| Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | major | non-breeding |
| Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | major | breeding |
| Wetlands (inland) | Permanent Rivers/Streams/Creeks (includes waterfalls) | major | breeding |
| Wetlands (inland) | Permanent Saline, Brackish or Alkaline Lakes | suitable | non-breeding |
| Altitude | 1900 - 1900 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Biological resource use | Hunting & trapping terrestrial animals - Persecution/control | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Negligible declines | Low Impact: 4 | ||||||
|
|||||||||
| Purpose | Primary form used | Life stage used | Source | Scale | Level | Timing |
|---|---|---|---|---|---|---|
| Food (human) | Whole | Adults and juveniles | 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 | |
| Sport | Whole | Adults and juveniles | Wild | Non-trivial | Recent | |
| Sport hunting/specimen collecting | - | - | Non-trivial | Recent |
Recommended citation
BirdLife International (2019) Species factsheet: Mergus merganser. Downloaded from
http://www.birdlife.org on 17/07/2019.
Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 17/07/2019.
