||Acrocephalus vaughani (Sharpe, 1900)
||Pitcairn Reed-warbler, Pitcairn Reed Warbler, Pitcairn Reed-Warbler
||del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
||17 cm. Large warbler with relatively short bill. Adult olive-brown above, yellowish-white below, with dark streak through eye and pale superciliary. White feathers variably and often asymmetrically scattered among darker feathers. Immatures brown above, rich tawny below without white feathers.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Bell, B., Bell, D., Brooke, M., Hall, J., Stringer, C., Bond, A., Oppel, S. & Bell, E.
||Derhé, M., Mahood, S., O'Brien, A., Stattersfield, A., Symes, A., Taylor, J., Stringer, C.
This species is listed as Endangered because it has a very small population which may be continuing to decline on the one tiny island where it occurs, as a result of habitat degradation and predation by introduced mammals. In the absence of robust evidence on population trend or size, it is suggested that a precautionary approach should be taken and it should be assumed that this species is at risk due to the tiny area it occupies, and the likely impact of introduced and invasive species.
|Previously published Red List assessments:|
- 2014 – Endangered (EN)
- 2012 – Endangered (EN)
- 2008 – Endangered (EN)
- 2004 – Vulnerable (VU)
- 2000 – Vulnerable (VU)
- 1996 – Vulnerable (VU)
- 1994 – Not Recognized (NR)
- 1988 – Not Recognized (NR)
|Population:||In 1998-1999, its population was estimated at c.2,000-3,000 individuals and increasing dramatically following the partial, but temporary control of feral cats Felis catus and Pacific rats Rattus exulans (B. and D. Bell verbally 1999, M. Brooke in litt. 2005). However, by 2005 numbers of Pacific rats and feral cats had recovered (M. Brooke in litt. 2005), which may have been accompanied by a reduction in numbers of the species. Efforts are now being made to obtain a more definite population estimate (A. Schofield, pers. comm. 2016).|
Trend Justification: There are no new quantitative data on population size and trends; however, since the unsuccessful eradication of feral cats and Pacific rats, the species is suspected to be declining at a slow rate as the populations of these pests recover.
|Current Population Trend:||Unknown|
|♦ Number of mature individuals:||250-999||♦ Continuing decline of mature individuals:||Unknown|
|♦ Extreme fluctuations:||No||♦ Population severely fragmented:||No|
|♦ No. of subpopulations:||1||♦ Continuing decline in subpopulations:||Unknown|
|♦ Extreme fluctuations in subpopulations:||No||♦ All individuals in one subpopulation:||Yes|
|♦ No. of individuals in largest subpopulation:||100|