||Pterodroma defilippiana (Giglioli & Salvadori, 1869)
||Masatierra Petrel, Defilippe's Petrel, Defilippi's Petrel, Masatierra Petrel, Mas Atierra Petrel
||Fardela blanca de Más a Tierra, Petrel chileno
||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.
||26 cm. Small, typical "M" marked gadfly petrel. Dark grey upperparts with sharp "M" mark. White forehead but dark grey cap and mask, extending to grey half-collar on upper breast. Dark grey rump and uppertail-coverts. Paler outer tail feathers. White throat and lower chest/belly. Predominantly white underwing, but black tip and narrow trailing edge, extending to leading edge. Similar spp. Separated from most other small gadfly petrels by whiter underwing. Cook's Petrel P. cookii has shorter and thinner bill and shorter tail. Stejneger's Petrel P. longirostris has paler crown and nape, and lacks darker central tail feathers. Pycroft's Petrel P. pycrofti is possibly inseparable, but ranges may not overlap.
|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Hodum, P. & Torres-Mura, J.
||Bird, J., Clay, R.P., Moreno, R., Temple, H.
This species qualifies as Vulnerable because it has a very small breeding range at three or four locations, and is therefore susceptible to stochastic events or human impacts. It is likely to have been extirpated from one island some time ago, but the bulk of the population is presumably stable.
|Previously published Red List assessments:|
- 2012 – Vulnerable (VU)
- 2010 – Vulnerable (VU)
- 2008 – Vulnerable (VU)
- 2006 – Vulnerable (VU)
- 2004 – Vulnerable (VU)
- 2000 – Vulnerable (VU)
- 1996 – Vulnerable (VU)
- 1994 – Vulnerable (VU)
- 1988 – Threatened (T)
|Range Description:||Pterodroma defilippiana is an east Pacific seabird, currently breeding on three or four islands off the coast of Chile. In the Desventuradas Islands, 10,000 or more birds occurred on San Ambrosio in 1970, with an additional 150-200 pairs on San Félix. The most recent estimate is 4600 breeding individuals on San Ambrosio (Hodum 2012). In the Juan Fernández Islands, it has possibly been extirpated on Robinson Crusoe, and the population on Santa Clara was suggested at hundreds, possibly thousands, in 1986, but available habitat was found for only 100-200 individuals in 1991. A recent estimate for the Juan Fernández Islands was 954 breeding individuals, of which 327 breeding pairs are on Santa Clara (Hodum 2012). The remaining breeding birds are on small rock stacks immediately offshore of Robinson Crusoe.|
It ranges at sea in the nearby Peru Current, south of the equator (Roberson and Bailey 1991, Spear et al. 1992).
|♦ Estimated area of occupancy (AOO) - km2:||9||♦ Continuing decline in area of occupancy (AOO):||Unknown|
|♦ Extreme fluctuations in area of occupancy (AOO):||No||♦ Estimated extent of occurrence (EOO) - km2:||1900000|
|♦ Continuing decline in extent of occurrence (EOO):||Unknown||♦ Extreme fluctuations in extent of occurrence (EOO):||No|
|♦ Number of Locations:||3||♦ Continuing decline in number of locations:||Unknown|
|♦ Extreme fluctuations in the number of locations:||No|
|Range Map:||Click here to open the map viewer and explore range.|