Population information

Order name Charadriiformes
Family name Laridae
Scientific name Hydroprogne caspia Common name Caspian Tern
Population name (strenua), New Zealand
Breeding range New Zealand Non-breeding range
Red List Category Least Concern
Ramsar regions Oceania
Notes No movements recorded between Australia and New Zealand (Higgins & Davies (1996)). Population split from Sterna caspia (strenua), Australia, New Zealand in WPE4

Conservation Framework

Conservation framework Notes
No conservation frameworks

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 4 0 0 1 5,000 [R178]
WPE 5 1995 2007 3,900 4,200 Census based [S7311] [R1016]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 4 0 0 Unknown
WPE 5 1971 1995 STA Good [T4492] [R1016]

Population 1% level

Publication Yearset 1 percent Note
WPE 4 2006 50
WPE 5 2012 40


  • R178 - del Hoyo, J., Elliot, A. and Sargatal, J. (eds). 1996. Handbook of the Birds of the World. Volume 3: Hoatzin to Auks. Lynx Edicions, Barcelona.
  • R1016 - Bell, M. and Bell, B.D. 2008. Population numbers of the Caspian tern (Sterna caspia) in New Zealand. Notornis 55: 84-88.


  • S7311 - Estimate based on breeding pairs in 17 colonies, with allowance for isolated pairs (thus, total of 1300-1400 pairs).
  • T4492 - Trend stable over more than two decades.

Copyright Wetlands International 2012

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