Population information

Order name Anseriformes
Family name Anatidae
Scientific name Mareca strepera Common name Gadwall
Population name strepera, North-west Europe
Breeding range NW Europe Non-breeding range W Europe
Red List Category Least Concern
Ramsar regions Europe
Notes

Conservation Framework

Conservation framework Notes
AEWA
EUBD
Note:

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 2 1990 1995 30,000 30,000 [R578]
WPE 4 0 0 60,000 60,000 [R257]
WPE 1 0 0 25,000 25,000 [R469]
WPE 3 0 0 60,000 60,000 [R257]
WPE 5 1997 1999 60,000 60,000 Expert opinion [R257]
CSR 4 1997 1999 60,000 60,000 Expert opinion [R257]
CSR 5 1997 1999 60,000 60,000 Expert opinion [R257]
CSR 6 2012 2012 110,000 110,000 Expert opinion [S8524] [R257] [R1362] [R1365]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 2 1967 1993 INC [R578]
WPE 4 1973 2002 INC [T3294] [R692]
WPE 1 0 0 Unknown
WPE 3 1987 1996 INC [R181]
WPE 5 1997 2007 INC Good [T5971] [R888]
CSR 4 1974 2002 INC Good
CSR 5 1997 2007 INC Good [T3298] [R888]
CSR 6 2003 2012 INC Reasonable [T6520] [R1381] [R1362]

Population 1% level

Publication Yearset 1 percent Note
WPE 2 1997 300
WPE 4 2006 600
WPE 1 1994 250
WPE 3 2002 600
WPE 5 2012 600
CSR 4 0 -1
CSR 5 0 -1
CSR 6 0 -1

References

  • 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.
  • R257 - Gilissen, N., Haanstra, L. and Delany, S. Boere, G. and Hagemeijer, W. 2002. Numbers and Distribution of Wintering Waterbirds in the Western Palearctic and Southwest Asia in 1997, 1998 and 1999 - Results from the International Waterbird Census. Wetlands International Globale Series No. 11, Wageningen, The Netherlands
  • R692 - Wetlands International, International Waterbird Census, unpublished data, 2005. See: http://www.wetlands.org/listmenu.aspx?id=56f39008-f9a9-4569-92c1-a0457e95eeaf
  • R469 - Morrison, R.G. et al. 1994. In: Hyslop, C. and Kennedy, J.A. (eds.). Bird Trends No. 3. Canadian Wildlife Service publication.
  • R181 - Delany, S.N., Reyes, C. Hubert, E., Pihl, S., Rees, E., Haanstra, L., and van Strien, A. 1999. Results from the International Waterbird Census in the Western Palearctic and Southwest Asia 1995 and 1996.
  • 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
  • R1362 - European Topic Centre on Biological Diversity (in prep) Population and trend data provided by the EU Member States in the frame of their reporting under Article 12 of the EU Birds Directive. Online fact sheets. European Topic Centre on Biological Diversity, Paris. URL: http://bd.eionet.europa.eu/activities/Reporting/Article_12/Reports_2013/Member_State_Deliveries. Accessed on 31 July 2014.
  • R1365 - Wetlands International, International Waterbird Census, unpublished data, 2014.
  • R1381 - Nagy, S., Flink, S., Langendoen, T. (2014) Waterbird trends 1988-2012: Results of trend analyses of data from the International Waterbird Census in the African-Eurasian Flyway. Wetlands International, Ede.
  • R1549 - BirdLife International 2015. European Red List of Birds. Luxembourg: Office for Official Publications of the European Communities. http://datazone.birdlife.org/info/euroredlist
  • 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

  • T3294 - The increase continues, but 122 erroneously included Central European birds in estimate for NW Europe.
  • T5971 - Wetlands International 2012. Trend 1983-2007: +7.5% p.a. ? Increase.
  • T3298 - 898. Trend 1983-2007: +7.5% p.a. – Increase.
  • S8524 - The current population estimate is 60,000 birds based on IWC counts from 1997-1999 (Gilissen, Haanstra, Delany, Boere, & Hagemeijer, 2002). However, IWC count totals reached 76,660 in individuals on sites where the species was observed at least twice and to some 99,000 individuals if all counts considered (Wetlands International, 2014). The total of national wintering population estimates in the EU Birds Directive Art. 12 report is 107,693-132,390 individuals, while the breeding population in SE, FI, EE, LT, LV, PL, DE, DK, UK, IE, NL, BE and FR is 29,157-44,659 pairs, i.e. 87,500-134,000 individuals (European Topic Centre on Biological Diversity, in prep.). Therefore, a new population estimate of 110,000 is proposed.
  • T6520 - The IWC trend analysis indicates large increase (Nagy et al., 2014). This is consistent with the overall trend obtained from the EU Birds Directive Art. 12 report for wintering (2.80-4.97% p.a. increase for 2000-2012 and 3.84-4.26% p.a. for 1980-2012) and breeding birds from NW Europe (5.12-7.46% p.a. increase for 2000-2012 and 3.48-5.47% increase for 1980-2012).
  • S8895 - The population estimate proposed in CSR6 based on IWC data agrees well with the breeding numbers (29,867 - 46,069 pairs, i.e. 90,000 - 138,000 individuals).



Copyright Wetlands International 2012

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