Population information

Order name Anseriformes
Family name Anatidae
Scientific name Thalassornis leuconotus Common name White-backed Duck
Population name leuconotus, Eastern & Southern Africa
Breeding range E, S Africa Non-breeding range
Red List Category Least Concern
Ramsar regions Africa
Notes

Conservation Framework

Conservation framework Notes
AEWA
Note:

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 1 0 0 10,000 25,000 No quality assessment [R115]
WPE 2 0 0 10,000 25,000 No quality assessment [R115]
WPE 3 0 0 10,000 25,000 No quality assessment [R115]
WPE 4 0 0 10,000 25,000 No quality assessment [R115]
WPE 5 1990 1990 10,000 25,000 Expert opinion [R115]
AEWA CSR 4 1990 1990 10,000 25,000 Expert opinion [R115]
AEWA CSR 5 1990 1990 10,000 25,000 Expert opinion [R115]
AEWA CSR 6 1990 1990 10,000 25,000 Expert opinion [S8680] [R115]
AEWA CSR 7 1990 1990 10,000 25,000 Best guess [S9132] [R115]
AEWA CSR 8 1990 1990 10,000 25,000 Best guess [S9132] [R115]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 1 1980 1990 STA No quality assessment [R115]
WPE 2 1980 1990 STA No quality assessment [R115]
WPE 3 1980 1990 STA No quality assessment [R115]
WPE 4 1980 1990 STA No quality assessment [R115]
WPE 5 1980 1990 STA Poor [R115]
AEWA CSR 4 1980 1990 STA Poor [R115]
AEWA CSR 5 1980 1990 STA Poor [R115]
AEWA CSR 6 2002 2012 Unknown No idea
AEWA CSR 7 2006 2014 DEC Reasonable [R1548]
AEWA CSR 8 2008 2017 DEC? Reasonable [T7238] [R1619]

Population 1% level

Publication Yearset 1 percent Note
WPE 1 1994 180
WPE 2 1994 180
WPE 3 1994 180
WPE 4 1994 180
WPE 5 2012 250
AEWA CSR 4 -1 -1 Not Set
AEWA CSR 5 -1 -1 Not Set
AEWA CSR 7 2012 250
AEWA CSR 8 2012 250

References

  • R115 - Callaghan, D.A. and Green, A.J. 1993. Wildfowl at risk, 1993. Wildfowl 44: 149-169.
  • R1548 - Wetlands International (2017) Flyway trend analyses based on data from the African-Eurasian Waterbird Census from the period of 1967-2015. Ede, The Netherlands: Wetlands International. URL: http://iwc.wetlands.org/index.php/aewatrends
  • R1619 - Nagy, S. & Langendoen, T. (2020) Flyway trend analyses based on data from the African-Eurasian Waterbird Census from the period of 1967-2018. Online publication. Wetlands International, Wageningen, The Netherlands. URL: http://iwc.test.wetlands.org/index.php/aewatrends8

Notes

  • S8680 - IWC counts may reach ca. 1,000 for whole range. No significant new information for this rather thinly-spread species.
  • S9132 - IWC counts may reach ca. 1,000 for whole range. No significant new information for this rather thinly-spread species.
  • T7238 - The short-term trend is statistically uncertain but suggests a declining population. Based on the short-term growth rate of 0.931, the population is projected to decrease by 66% over 3 generations. The trend is also negative in the last 3 generations and a statistically significant decrease between 1999 – 2017. However, it is based on a very small sample size.



Copyright Wetlands International 2012

Citation: Wetlands International (). "Waterbird Population Estimates" . Retrieved from wpe.wetlands.org on