Population information

Order name Charadriiformes
Family name Laridae
Scientific name Gygis alba Common name Common White Tern
Population name candida (royana), Norfolk I and Kermadec Is
Breeding range Norfolk & Kermadec Is Non-breeding range
Red List Category Least Concern
Ramsar regions Oceania
Notes some authors have preferred to recognize several additional races, including royana (of Norfolk I and Kermadec Is), kittlitzi (Caroline Is), pacifica (Melanesia and other islands of S Pacific) and rothschildi (Hawaii), all of which herein included in candida, but all are sometimes referred instead to nominate race.

Conservation Framework

Conservation framework Notes
No conservation frameworks
Note:

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 1 0 0 6,000 6,000 [R165]
WPE 2 0 0 15,000 15,000 [R165]
WPE 3 0 0 -1 -1 [S2802] [R249]
WPE 4 0 0 -1 -1 [S2802] [R249]
WPE 5 1995 1999 1 10,000 Best guess [S7465] [R267] [R313]

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 No idea

Population 1% level

Publication Yearset 1 percent Note
WPE 1 1994 60
WPE 2 1997 150
WPE 3 0 -1
WPE 4 0 -1
WPE 5 2012 100

References

  • R165 - Croxall, J.P., Evans, P.G.H. and Schreiber, R.W. (eds.). 1984. Status and Conservation of the World's Seabirds. ICBP Technical Publication No. 2. Cambridge, UK.
  • R249 - Garnett, S.T. and Crowley, G.M. 2000. The Action Plan for Australian Birds 2000. Environment Australia, Canberra.
  • R267 - Green, A.J. 1992a. The status and conservation of the White-winged Wood Duck (Cairina scutulata). IWRB Special Publication No. 17. Slimbridge, UK. 115 pp.
  • R313 - Marchant, S.M. and Higgins, P.J. 1993. Handbook of Australian, New Zealand and Antarctic Birds. Volume 2: Raptors to Lapwings. Oxford University Press, Melbourne, Australia.

Notes

  • S2802 - 252 estimate 6,500 breeding adults (9,750 individuals) on Norfolk, Cocos-Keeling & Lord Howe Is.
  • S7465 - Estimate based on conservative interpretation of data on breeding numbers from Norfolk, Lord Howe and Kermadec Islands.



Copyright Wetlands International 2012

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