Population information

Nom ordre Charadriiformes
Nom famille Laridae
Nom scientifique Thalasseus bergii Nom courant Greater Crested Tern
Nom population bergii, Southern Africa (Angola - Mozambique)
Aire de reproduction Namibia to South Africa Aire de non-reproduction Angola to S. Mozambique
Catégorie de la Liste Rouge Least Concern
Regions Ramsar Africa
Notes In WPE2 this population belonged to one single population (S Africa/Madagascar (breeding)).

Réseau de conservation

Réseau de conservation Notes
AEWA
Note:

Taille de population

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 3 0 0 20,000 20,000 No quality assessment [R295]
WPE 4 0 0 20,000 20,000 No quality assessment [R295]
WPE 5 1994 1996 20,000 20,000 Expert opinion [R295]
AEWA CSR 4 1994 1996 20,000 20,000 Expert opinion [R295]
AEWA CSR 5 1994 1996 20,000 20,000 Expert opinion [R295]
AEWA CSR 6 1994 1996 15,000 25,000 Expert opinion [S8707] [R1371] [R317] [R196] [R1513]
AEWA CSR 7 1994 1996 15,000 25,000 Expert opinion [S8707] [R1371] [R317] [R196] [R1513]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 3 1990 2000 STA No quality assessment [R196]
WPE 4 1990 2000 STA No quality assessment [R196]
WPE 5 1990 2000 STA? No idea [R196]
AEWA CSR 4 1990 2000 STA? Poor [R196]
AEWA CSR 5 1990 2000 STA? Poor [R196]
AEWA CSR 6 2003 2012 Unknown No idea
AEWA CSR 7 1994 2015 INC? Poor [R1548]

Population 1% level

Publication Yearset 1 percent Note
WPE 3 2002 200
WPE 4 2006 200
WPE 5 2012 200
AEWA CSR 4 -1 -1 Not Set
AEWA CSR 5 -1 -1 Not Set
AEWA CSR 7 2018 200

References

  • 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.
  • R196 - du Toit, M., Boere, G.C., Cooper, J., Kemper, J., Lenten, B., Simmons, R.S., Whittington, P.A. and Byers, O. (eds). 2002. Conservation assessment and management plan for southern African coastal seabirds. Workshop Report, Cape Town, South Africa, 4-8 Feb
  • 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/
  • R317 - Hockey P.A.R., Dean, W.R.J. and Ryan, P.G. (eds). 2005. Roberts - Birds of Southern Africa, 7th ed. The Trustees of the John Voelcker Bird Book Fund, Cape Town.
  • R1513 - Crawford (2003)
  • 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
  • R1620 - van Roomen, M., Nagy, S., Citegetse, G., & Schekkerman, H. (2018). East Atlantic Flyway Assessment 2017: the status of coastal waterbird populations and their sites. Wadden Sea Flyway Initiative p/a CWSS, Wetlands International, BirdLife International, Wilhelmshaven, Wageningen and Cambridge. Retrieved from: https://www.waddensea-worldheritage.org/resources/east-atlantic-flyway-assessment-2017
  • 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

  • S8707 - A range seems most appropriate, as breeding population is significantly related to food availability.
  • T7665 - Based on IWC data, van Roomen et al. (2018) reported moderate increase for 1995-2017 (1.05) and uncertain trend for 2008-2017 (1.03). Based on updated IWC data and using different site selection and trend analysis techniques Nagy & Langendoen (2020) reported moderate increase for 1994-2017 (1.0652) and uncertain trend for 2008-2017 (0.9827). Based on the growth rate of the last 10 years, the population is projected to decrease by 48% in 3 generations compared to the population levels in 2008. The decline is particularly visible in the trends for NA but it is also visible in the count totals.



Copyright Wetlands International 2012

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