Population information

Order name Charadriiformes
Family name Laridae
Scientific name Thalasseus bergii Common name Greater Crested Tern
Population name enigma, Madagascar & Mozambique/Southern Africa
Breeding range Madagascar, ?Juan de Nova, Mozambique Non-breeding range Zambezi Delta, Mozambique, to Durban, South Africa
Red List Category Least Concern
Ramsar regions Africa
Notes Often assigned to bergii. In WPE2 this population belonged to one single population (S Africa/Madagascar (breeding)). Enigma is now synonymised with the nominate form. Following Safford and Hawkins (2013) this population is combined with the population thalassinus, Seychelles, Tanzania & Chagos (breeding) into the new population thalassinus, western Indian Ocean.

Conservation Framework

Conservation framework Notes
AEWA
Note:

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 3 2001 2001 7,500 10,000 [R190]
WPE 4 2001 2001 7,500 10,000 [R190]
WPE 5 2001 2001 7,500 10,000 Expert opinion [R190]
CSR 4 2001 2001 7,500 10,000 Expert opinion [R190]
CSR 5 2001 2001 7,500 10,000 Expert opinion [R190]
CSR 6 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
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

Population 1% level

Publication Yearset 1 percent Note
WPE 3 2002 90
WPE 4 2006 90
WPE 5 2012 85
CSR 4 0 -1
CSR 5 0 -1

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 Unpublished report to Wetlands International.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. Temporary URL: https://www.dropbox.com/sh/r76f4eyuhzu65co/AADzzQkhySsUDsmwFJUcHs91a?dl=0

Notes

  • T7069 - Possibly increasing in the short-term.



Copyright Wetlands International 2012

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