CR
Brazilian Merganser Mergus octosetaceus



Family: Anatidae (Ducks, Geese, Swans)

Authority: Vieillot, 1817

Red List Category

Criteria: C2a(i)

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Justification of Red List category
Recent records from Brazil indicate that this species's status may be marginally better than previously thought. Nevertheless, the remaining known population is still extremely small and fragmented, and the perturbation, damming and pollution of rivers are likely to be causing continuing declines. For these reasons, it is listed as Critically Endangered. Further information on the population size (in particular whether it exceeds 250 mature individuals) and on the subpopulation structure may result in its downlisting to Endangered in the future.



Population size: 50-249

Population trend: Decreasing

Distribution size (breeding/resident): 1,270,000 km2

Country endemic: No

Attributes
Land-mass type - continent
Realm - Neotropical
IUCN Ecosystem -- Freshwater biome

Recommended citation
BirdLife International (2016) Species factsheet: Mergus octosetaceus. Downloaded from http://www.birdlife.org on 10/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 10/12/2016.