LC
Ruddy Duck Oxyura jamaicensis



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). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to 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.

Trend justification
The overall population trend is decreasing, although some populations may be stable and others have unknown trends (Wetlands International 2006). 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).

Ecology

The species is partly migratory; North American breeders tend to depart from breeding grounds to winter further south or near the coast, whereas other populations are sedentary or make only short-distance movements. Freshwater swamps, lakes, pools, and marshes with emergent vegetation and open water are preferred breeding habitats, although outside the breeding season the species can also be found on larger lakes, brackish lagoons and estuaries (Carboneras 1992).

Acknowledgements

Text account compilers
Butchart, S., Ekstrom, J., Symes, A., Taylor, J. & Temple, H.


Recommended citation
BirdLife International (2019) Species factsheet: Oxyura jamaicensis. Downloaded from http://www.birdlife.org on 22/03/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/03/2019.