Distribution and Habitat
Zino's Petrel is endemic to the main island of Madeira, where it breeds on inaccessible and well-vegetated ledges in the central mountains between Pico do Areeiro and Pico Ruivo. The typical ledge plants are endemic hemicryptophytess and Chamaephytes, but grasses may also be present. It nests at heights above 1650 m (5400 ft). It was formerly more widespread, since subfossil remains have been found in a cave in eastern Madeira, and on nearby Porto Santo Island. The breeding ledges have to be inaccessible to introduced goats so that they remain rich in endemic flora. The vegetation ensures that there is sufficient earth on the ledges to allow the birds to burrow and make their nests, and trampling by grazing animals reduces the soil cover.
This petrel is only present in Madeiran waters during the breeding season. Its distribution at sea during the rest of the year is poorly known due to the rarity of the species and the difficulty of separating it from other Pterodroma petrels at sea. Birds identified as either Zino's or Fea's have been recorded from both sides of the North Atlantic, and in Ireland and Britain there has been a large increase in the number of reports, perhaps because global warming brings increasing numbers of tropical species into temperate waters. The timing of the reports, mainly in late spring and summer in the western North Atlantic, and in late summer and early autumn in the east, has suggested that birds follow a clockwise route around the North Atlantic after leaving their breeding sites. However, the few birds that have been identified with certainty have all been Fea's. Zino's Petrel may have a similar strategy, since preliminary results from geolocation studies indicate widespread dispersal over the North Atlantic central ridge during the breeding season, and migration towards the Brazilian coast in the non-breeding period. Pterodroma petrels have been recorded in the Canary Islands and the Azores on surprisingly few occasions; a claim of possible Zino's from South Africa is now thought to be erroneous.
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