Resumen de Notes on the distribution of the madeiran barn owl Tyto Alba Schmitzi (Aves: Tytonidae)

Felipe Siverio, Domingo Trujillo González, Juan José Ramos Melo

• español

  En este trabajo se aborda la distribucion de Tyto alba en el archipielago de Madeira y, de forma preliminar, se tipifica su habitat en las islas de Madeira y Porto Santo. En la primera aparece desde practicamente el nivel del mar hasta las medianfas, donde ademas de su aparente predileccion por paredes de barrancos interiores. con contornos cultivados, tambien ocupa enclaves tanto aislados como muy antropizados. Parece estar completamente ausente en el interior de los bosques de laurisilva, y una deteccion a 1.600 m.s.m. podria corresponder a un caso de presencia temporal. Las observaciones en Porto Santo dejan entrever que se distribuye principalmente en el sector septentrional, hecho vinculado a la mayor riqueza de biotopos adecuados. Respecto a Ilheu de Baixo y Deserta Grande, islotes donde habría referencias del ave, unicamente fue registrada en el ultimo; sin embargo, se ofrecen los primeros datos para Bugio.

• English

  This paper discusses the distribution of Tyto alba in the Madeiran Archipelago and presents a preliminary typification of the species habitat on the islands of Madeira and Porto Santo. On Madeira, the Barn Owl is found practically from sea level up to the middle zones of the island where, in addition to its apparently preference for the walls of interior gorges situated in cultivated districts, it also occupies remote areas as well as heavily populated ones. However, it appears to be completely absent from the interior of laurel forests, and an observation made at 1,600 m. a.s.l. could well correspond to a case of temporary presence. The observations from Porto Santo tend to indicate that the species is found mainly in the northern half of the island, a fact which appears to be related to the greater abundance of suitable biotopes. As regards to Ilheu de Baixo and Deserta Grande, islets where the species had been recorded previously, only one observation was made on the latter; on the other hand, the first record is presented for Bugio.