Evidence found
428,335 records across 35 countries and territories, 1790–2026.
Mergus serrator · GBIF taxon key 2498375
Where has the Red-breasted Merganser been recorded?
Mergus serrator occurrence evidence comes from 428,335 records in 35 countries and territories, from 1790 to 2026. Most records come from Sweden.
- 428,335 records
- 35 places
- 165 years recorded
- Aves class
Observation evidence passport
Source coverage
CC0 GBIF Animalia occurrence facets, including country, month and year summaries.
Refreshed 2026-08-23. Inspect the taxon on GBIF.
What this means
The species has been recorded in the listed places in the stated source universe. Peak month: May.
12 months reach at least 10% of the peak facet count.
What this does not mean
repeated describes the record pattern, not a formal range, residency, abundance or conservation assessment.
A single record remains evidence of a recording, not proof that a population lives there.
Compare this animal’s observation pattern
When it is recorded
JFMAMJJASOND
Peak month: May. Records cluster in the months an animal is present and being looked for, so a summer peak can reflect observer effort as much as the animal.
Records over time
17902026
Recording effort has risen steeply almost everywhere since the 1990s, so a rising line usually shows more observers rather than more animals.
Where Red-breasted Merganser has been recorded
The countries below show where occurrence evidence exists for Red-breasted Merganser. They do not define a complete habitat range: survey effort differs by place, and historical or one-off records can appear alongside repeated presence.
| Place | Records | Share |
|---|---|---|
| Sweden | 409,535 | |
| United States | 10,823 | |
| Belgium | 5,214 | |
| Canada | 1,196 | |
| United Kingdom | 615 | |
| South Korea | 270 | |
| Austria | 236 | |
| Russia | 64 | |
| Netherlands | 62 | |
| Spain | 60 | |
| Ukraine | 57 | |
| Germany | 38 | |
| Norway | 34 | |
| Mexico | 25 | |
| Denmark | 20 | |
| Iceland | 17 | |
| Estonia | 13 | |
| Finland | 11 | |
| Japan | 9 | |
| Mongolia | 7 | |
| France | 6 | |
| Ireland | 5 | |
| Italy | 4 | |
| India | 3 | |
| Albania | 1 | |
| Belarus | 1 | |
| Switzerland | 1 | |
| China | 1 | |
| Croatia | 1 | |
| Iran | 1 | |
| Jersey | 1 | |
| Poland | 1 | |
| Romania | 1 | |
| Slovenia | 1 | |
| ZZ | 1 |
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Record pattern: repeated
Repeated records across many years and months. This is inferred from how many years and months the animal appears in, not from a range map — treat it as evidence, not a formal assessment.
Repeated records across many years and months. This is inferred from how many years and months the animal appears in, not from a range map — treat it as evidence, not a formal assessment.