Population information

Order name Ciconiiformes
Family name Ardeidae
Scientific name Ixobrychus dubius Common name Australian Little Bittern
Population name dubius
Breeding range SW & E Australia (not Tasmania), S New Guinea (possible migrant from Australia) Non-breeding range
Red List Category Least Concern
Ramsar regions Oceania
Notes Now considered a distinct species, previously laced under Ixobrychus minutus

Conservation Framework

Conservation framework Notes
No conservation frameworks
Note:

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 3 1999 1999 7,500 7,500 [R249]
WPE 1 0 0 -1 -1
WPE 2 0 0 -1 -1
WPE 4 2003 2003 1 25,000 [S3988] [R341]
WPE 5 1994 2010 1 10,000 Best guess [S7783] [R341] [R1025] [R1041] [R1044] [R1103]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 3 1985 1995 STA [R249]
WPE 1 0 0 Unknown
WPE 2 0 0 Unknown
WPE 4 0 0 Unknown
WPE 5 1982 2011 DEC? No idea [T5714] [R1101]

Population 1% level

Publication Yearset 1 percent Note
WPE 3 2002 75
WPE 1 0 -1
WPE 2 0 -1
WPE 4 2006 250
WPE 5 2012 100

References

  • R249 - Garnett, S.T. and Crowley, G.M. 2000. The Action Plan for Australian Birds 2000. Environment Australia, Canberra.
  • 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,
  • R1025 - Birds Australia. 2011. The Bittern Chronicle No. 3, September 2011. Online http://www.birdsaustralia.com.au/images/stories/current-projects/bittern/Bittern-Chronicle-Sep11.pdf accessed April 2012.
  • R1041 - Christidis, L. and Boles, W.E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Melbourne.
  • R1044 - Clarke, A.G., Lane, J.A.K. and Jaensch, R.P. 2011. Surveys of waterbirds in selected wetlands of south-western Australia in spring-summer 2009-10, with further assessment of changes in habitat and waterbird usage over 2-3 decades. Western Australian Department of Environment and Conservation. 101pp.
  • R1103 - Jaensch, R.P. 1995. Little Bitterns (Ixobrychus minutus) in the Middle Fly wetlands. Muruk 7 (3): 117-118.
  • 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.

Notes

  • S3988 - 252 estimated 5,000 breeding birds (7,500 individuals). 344 amended: "given extent of remaining habitat, pop. size could be at least double and so within range 1 - 25,000".
  • S7783 - Data inadequate to derive a numerical estimate due to survey difficulties; numbers recorded support 1 - 10,000.
  • T5714 - Trend is possibly declining due to loss of inland habitat.



Copyright Wetlands International 2012

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