Petrello magenta

Identificazione

This medium-sized petrel has a brownish-grey head, neck, and upper breast, with white underparts. The undersides of the wings are brown. It has a black bill and pink legs. Adults weigh 400–580 g.<p>The bird nests in 1–3 m long burrows under dense forest. They form long-term monogamous pair bonds, raising one egg at a time, and both partners incubate the egg and feed the chick. The breeding season is between September and May, during which time the birds forage over the open ocean.

Tassonomia

Nome scientifico

Pterodroma magentae

Autorità

(Giglioli & Salvadori, 1869)

Ordine

Procellariformi

Famiglia

Procellaridi

Genere

Pterodroma

Areale e habitat

Areale riproduttivo

PO : Chatham Is. (e of South I., New Zealand)

Areale non riproduttivo

to Pitcairn group (se Polynesia), Juan Fernandez and Nazca Ridge (w of c South America)

Migrazione

Complete migrants

Conservazione

Formerly widespread on Chatham Island, the tāiko is now confined to the forested Tuku Valley on the south-west of the island. The species is one of the rarest birds in the world. The species is classified as critically endangered due to an assumed population decline in excess of 80% in the last 60 years and the fact that it is restricted to one small location. In the 2005 breeding season, the 13 known breeding pairs successfully fledged 11 chicks. In 2017, 34 breeding pairs were being monitored. The current population is estimated at between 80 and 100 mature individuals.<p>The main threats to the species are introduced mammalian predators, principally cats and rats, other threats are present from feral pigs collapsing burrows.<p>The land on which tāiko were first rediscovered was privately owned by Manuel and Evelyn Tuanui, who in 1983 donated 1283 hectares of land to the government to protect the species, becoming the Tuku Nature Reserve. In a 2004 report, about 80 percent of tāiko breeding burrows were in this reserve. The Tuanui family were also founding members of the Chatham Island Taiko Trust, an organisation formed to promote taiko conservation work.<p>A conservation strategy is in place on the island to translocate chicks to an area where the main threats have been removed called the Sweetwater Secure Breeding Site. Studies in other petrel species such as the Manx shearwater, wandering albatross, and Cory's shearwater, have shown that birds return to the site in which they fledged. In 2007, eight chicks were successfully translocated and fledged from the breeding site. There has also been a predator-proof fence built around a small area of land since 2006, 60 tāiko have been relocated to this area.

Tendenza della popolazione

rising