||Phalacrocorax colensoi Buller, 1888
||Auckland Shag, Auckland Island Shag
Leucocarbo colensoi ssp. colensoi (Buller, 1888) — Turbott (1990)
||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.
||63 cm. Medium-sized, black-and-white cormorant. Black head, hindneck, lower back, rump, uppertail-coverts, all with metallic blue sheen. White underparts. Pink feet. White patches on wings appear as bar when folded. Caruncles absent. Voice During courtship displays, male barks and makes ticking sounds, female gives soft purr.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Bell, B., Hiscock, J., Taylor, G.A. & Weeber, B.
||Benstead, P., Mahood, S., McClellan, R., Pilgrim, J., Taylor, J.
This species is classified as Vulnerable because it has a very small range when breeding, being locally restricted to inaccessible coastline sites, and is therefore susceptible to stochastic events and human impacts. Population trends are unknown, but are assumed to be stable.
|Previously published Red List assessments:|
- 2012 – Vulnerable (VU)
- 2010 – Vulnerable (VU)
- 2008 – Vulnerable (VU)
- 2005 – Vulnerable (VU)
- 2004 – Vulnerable (VU)
- 2000 – Vulnerable (VU)
- 1996 – Vulnerable (VU)
- 1994 – Vulnerable (VU)
- 1988 – Lower Risk/least concern (LR/lc)
|Population:||Although the population was thought to number fewer than 1,000 individuals, surveys in 1988 and 1989 indicated 475 nests in 11 colonies on Enderby, one colony of 62 nests on Rose, and 306 nests on Ewing. A boat-based survey of Enderby Island carried out in 2011 counted 1,366 active nests in 10 colonies (J. Hiscock in litt. 2012). Based on these data, a population of c.3,000 mature individuals is estimated, although a more up-to-date estimate of numbers in other colonies is needed (J. Hiscock in litt. 2012). On the basis of the estimated number of mature individuals, there are assumed to be c.4,500 individuals in total.|
Trend Justification: There are no new data, but the population is thought to be stable, following the elimination of most feral predators.
|Current Population Trend:||Stable|
|♦ Number of mature individuals:||3000||♦ Continuing decline of mature individuals:||Unknown|
|♦ Extreme fluctuations:||No||♦ Population severely fragmented:||No|
|♦ No. of subpopulations:||5||♦ Continuing decline in subpopulations:||Unknown|
|♦ Extreme fluctuations in subpopulations:||No||♦ All individuals in one subpopulation:||No|
|♦ No. of individuals in largest subpopulation:||1-89|