LC
Black Swan Cygnus atratus



Justification

Justification of Red List Category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The global population is estimated to number c.100,000-1,000,000 individuals (Wetlands International 2006), while the population in Japan has been estimated at c.100-10,000 introduced breeding pairs (Brazil 2009).

Trend justification
The population is suspected to be stable in the absence of evidence for any declines or substantial threats.

Acknowledgements

Text account compilers
Ekstrom, J., Butchart, S.


Recommended citation
BirdLife International (2019) Species factsheet: Cygnus atratus. 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.