Population information

Order name Charadriiformes
Family name Laridae
Scientific name Hydroprogne caspia Common name Caspian Tern
Population name (strenua), Australia
Breeding range Australia 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 2003 2003 10,000 100,000 No quality assessment [R341]
WPE 5 1995 2004 10,000 100,000 Best guess [S7310] [R313] [R341] [R1101]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 4 0 0 Unknown No quality assessment
WPE 5 1982 2011 STA? No idea [T4491] [R1126]

Population 1% level

Publication Yearset 1 percent Note
WPE 4 2006 1000
WPE 5 2012 1000


  • R341 - Jaensch, Roger, August 2005. Detailed data and notes on numbers and distribution of waterbirds in Australia, updated from Jaensch, 2003, and derived from more than 90 Australian sources including Wetlands International, Birds Australia and Jaensch, 2003,
  • 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.
  • R1101 - Jaensch, R. April 2012. Detailed data and notes on numbers and trends of waterbirds in Australia and other parts of the Oceania region, in a spreadsheet prepared for Wetlands International - Oceania for the 5th edition of WPE.
  • R1126 - Minton, C.D.T. In litt. 19, 23 and 27 April 2012 (Victorian Wader Study Group).


  • S7310 - Estimate derived from WPE4 estimate, moderated to provide a more conservative estimate in the absence of adequate count data across entire range of inland and coastal Australia.
  • T4491 - Some evidence of stable trend at coastal sites monitored for three decades.

Copyright Wetlands International 2012

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