Population information

Order name Anseriformes
Family name Anatidae
Scientific name Anas undulata Common name Yellow-billed Duck
Population name undulata, Southern Africa
Breeding range Southern 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 60,000 60,000 [R423]
WPE 2 1990 1995 60,000 60,000 [R578]
WPE 3 0 0 100,000 100,001 [R295]
WPE 4 0 0 100,000 1,000,000 [S5213] [R295]
WPE 5 1996 1996 100,000 100,001 Best guess [R295]
CSR 4 1996 1996 100,000 100,001 Best guess [R295]
CSR 5 1996 1996 100,000 100,001 Best guess [R295]
CSR 6 1965 2014 100,000 250,000 Best guess [S8619] [R1371]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 1 1972 1992 STA [R214]
WPE 2 1980 1996 STA [R578]
WPE 3 1980 1996 STA [R578]
WPE 4 1980 1996 STA [R578]
WPE 5 1997 2007 INC Poor [T6017] [R888]
CSR 4 1990 1992 INC Poor
CSR 5 1997 2007 INC Poor [T3415] [R888]
CSR 6 1997 2007 INC Poor [T6762] [R888]

Population 1% level

Publication Yearset 1 percent Note
WPE 1 1994 600
WPE 2 1997 600
WPE 3 2002 1000
WPE 4 2006 10000
WPE 5 2012 1000
CSR 4 0 -1
CSR 5 0 -1

References

  • R423 - Madge, S. and H. Burn 1988. Wildfowl: An identification guide to ducks, geese and swans of the world. Christopher Helm, Bromley, UK.
  • R214 - Ellis-Joseph, S., Hewston, N. and Green, A. (compilers). 1992. Global Waterfowl Conservation Assessment and Management Plan: First Review Draft. Report by the IUCN Captive Breeding Specialist Group and The Wildfowl and Wetlands Trust. 1992. 77 pp.
  • R578 - Scott, D.A. and Rose, P.M. 1996. Atlas of Anatidae populations in Africa and western Eurasia. Wetlands International Publication No. 41. Wetlands International, Wageningen, NL. 336 pp.
  • R295 - Harrison, J.A., Allan, D.G., Underhill, L.G., Herremans, M., Tree, A.J., Parker, V. and Brown, C.J. (1997). The Atlas of Southern African Birds. Vol.1. BirdLife South Africa, Johannesburg. 785 pp.
  • R888 - Wetlands International, 2012. Results of trend analysis undertaken for CSR5 2012, presented in Annex 4. http://www.unep-aewa.org/meetings/en/mop/mop5_docs/pdf/mop5_14_csr5.pdf
  • R1371 - Dodman, T. 2014. Status, Estimates and Trends of Waterbird Populations in Africa: AEWA-listed African populations. Wetlands International. (CSR6 African populations) URL: https://www.wetlands.org/publications/1304/
  • 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. Temporary URL: https://www.dropbox.com/sh/r76f4eyuhzu65co/AADzzQkhySsUDsmwFJUcHs91a?dl=0

Notes

  • S5213 - 100,000 in Orange Free State & S Transvaal alone (298).
  • T6017 - Wetlands International 2012. Trend 1983-2007: +2.4% p.a. ? Increase.
  • T3415 - 898. Trend 1983-2007: +2.4% p.a. – Increase.
  • S8619 - One estimate of 100,000 in Orange & Transvaal (South Africa) is the basis of the previous estimate, which dates from 1980s. Yet no data has ever supported the previous maximum estimate of 1 million. A more conservative upper limit is given, noting that the region where 100,000 were estimated is where it is most abundant.
  • T6762 - Wetlands International 2012. Trend 1983-2007: +2.4% p.a. ? Increase.



Copyright Wetlands International 2012

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