Population information

Nom ordre Charadriiformes
Nom famille Laridae
Nom scientifique Thalasseus bergii Nom courant Greater Crested Tern
Nom population bergii, Madagascar & Mozambique/Southern Africa
Aire de reproduction Madagascar, ?Juan de Nova, Mozambique Aire de non-reproduction Zambezi Delta, Mozambique, to Durban, South Africa
Catégorie de la Liste Rouge Least Concern
Regions Ramsar Africa
Notes In WPE2 this population belonged to one single population (S Africa/Madagascar (breeding)). Then this population was separated as 'enigma' subspecies. 'Enigma' is now synonymised with the nominate form. However, the population is treated separately until further evidence is available to confirm the degree of exchange of individuals among colonies.

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 2001 2001 7,500 10,000 No quality assessment [R190]
WPE 4 2001 2001 7,500 10,000 No quality assessment [R190]
WPE 5 2001 2001 7,500 10,000 Expert opinion [R190]
AEWA CSR 4 2001 2001 7,500 10,000 Expert opinion [R190]
AEWA CSR 5 2001 2001 7,500 10,000 Expert opinion [R190]
AEWA CSR 6 2001 2001 7,500 10,000 Expert opinion [R190]
AEWA CSR 7 2001 2001 7,500 10,000 Expert opinion [R190]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 3 0 0 Unknown No quality assessment
WPE 4 0 0 Unknown No quality assessment
WPE 5 0 0 Unknown No quality assessment
AEWA CSR 4 0 0 Unknown No quality assessment
AEWA CSR 5 0 0 Unknown No quality assessment
AEWA CSR 6 0 0 Unknown No idea
AEWA CSR 7 1993 2015 STA/FLU Poor [T7069] [R1548]

Population 1% level

Publication Yearset 1 percent Note
WPE 3 2002 90
WPE 4 2006 90
WPE 5 2012 85
AEWA CSR 4 -1 -1 Not Set
AEWA CSR 5 -1 -1 Not Set
AEWA CSR 7 2018 85

References

  • R190 - Dodman, T. 2002. Waterbird Population Estimates in Africa. Unpublished report to Wetlands International.
  • 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

Notes

  • T7069 - Possibly increasing in the short-term.



Copyright Wetlands International 2012

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