||Henderson Lorikeet, Stephen's Lorikeet
||Lori de Stephen
||del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
||18 cm. Red-and-green parakeet. Dark green above shading to golden-yellow tip of tail. Red on cheeks and underparts, dark purple central belly. Belt across chest green at sides, purple in centre. Golden-yellow bill and eyes. Voice A shrill screech.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Brooke, M., Hall, J., Bell, B., Bond, A. & Oppel, S.
||Mahood, S., Shutes, S., Stattersfield, A., Derhé, M. & Stringer, C.
This species may prove to be the only member of its genus whose habitat and population size have been little affected by adverse changes to its environment. However, it qualifies as Vulnerable as it is found only on one small island, where it is at risk from the accidental introduction of alien species.
|Previously published Red List assessments:|
- 2013 – Vulnerable (VU)
- 2012 – Vulnerable (VU)
- 2008 – Vulnerable (VU)
- 2004 – Vulnerable (VU)
- 2000 – Vulnerable (VU)
- 1996 – Vulnerable (VU)
- 1994 – Vulnerable (VU)
- 1988 – Threatened (T)
|Population:||The population is was estimated to number 720-1,820 individuals in 1987, roughly equating to 480-1,200 mature individuals (adjusted to 650-1600 individuals when using the correct island area and assuming 75% of the island is suitable habitat) (Oppel and Bond in litt. 2016). In 2015, the population at 25 point count locations was estimated to number 139 (95% CI 66 - 342) individuals. However, given the potentially long movements of this species it is difficult to extrapolate this sample from a limited (but unknown) area to a global population estimate. The trend estimated for counts from 2009 - 2015 indicated that the population is stable (mean trend 0.045, 95%CI: -0.017 - 0.107) (Oppel and Bond in litt. 2016).|
Trend Justification: Although no new data are available on population trends, the entire range of the species is well protected and no new threats are suspected. Hence, the species is suspected to be stable.
|Current Population Trend:||Stable|
|♦ Number of mature individuals:||480-1200||♦ Continuing decline of mature individuals:||No|
|♦ 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|