Population information

Order name Charadriiformes
Family name Laridae
Scientific name Thalasseus bergii Common name Greater Crested Tern
Population name thalassinus, Eastern Africa & Seychelles
Breeding range Tanzania, Seychelles, Chagos Non-breeding range
Red List Category Least Concern
Ramsar regions Africa Asia
Notes In CSR6 it was proposed to combine this population with the Madagascar & Mozambique/Southern Africa population. However, the population is treated separately until further evidence is available to confirm the degree of exchange of individuals among colonies.

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 1,200 1,200 [R670]
WPE 2 0 0 1,200 1,200 [R670]
WPE 3 2001 2001 1,300 1,700 [R190]
WPE 4 2001 2001 1,300 1,700 [R190]
WPE 5 2001 2001 1,300 1,700 Expert opinion [R190]
CSR 4 2001 2001 1,300 1,700 Expert opinion [R190]
CSR 5 2001 2001 1,300 1,700 Expert opinion [R190]
CSR 6 2001 2001 1,300 1,700 Expert opinion [R190]
CSR 7 2001 2001 1,300 1,700 Expert opinion [R190]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 1 0 0 Unknown
WPE 2 0 0 Unknown
WPE 3 0 0 Unknown
WPE 4 0 0 Unknown
WPE 5 0 0 Unknown
CSR 4 0 0 Unknown
CSR 5 0 0 Unknown
CSR 6 0 0 Unknown No idea
CSR 7 1995 2015 STA/FLU Poor [R1548]

Population 1% level

Publication Yearset 1 percent Note
WPE 1 1994 12
WPE 2 1997 12
WPE 3 2002 15
WPE 4 2006 15
WPE 5 2012 15
CSR 4 0 -1
CSR 5 0 -1
CSR 7 2018 15

References

  • R670 - Urban, E.K., Fry, C.H. and Keith, S. 1986. The Birds of Africa. Volume II. Academic Press, London and Orlando.
  • 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 Unpublished report to Wetlands International.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




Copyright Wetlands International 2012

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