| Titre : | The Osprey Pandion haliaetus on the Portuguese coast: Past, present and recovery potential |
| Auteurs : | Luis Palma, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (122(3-4) 2001) |
| Article en page(s) : | 179-190 |
| Résumé : | According to literature, toponymy and personal communication, Ospreys were common along the rocky coast of Portugal until the beginning of the 20th century. Thereafter, increasing human encroachment on the coastline, especially through persecution, caused a severe and steady decline that led to the verge extinction as the breeding population became reduced to one single pair. Considering the critical demographic situation and geographic isolation of the population, natural recovery is unlikely. Precipitous sea-cliffs, exposed coastline and moderate to low human presence are the dominant features of Osprey breeding habitat in Portugal. Nests are built atop rock pinnacles and on cliff ledges. During periods of rough water surface at sea, fresh and brackish water fish from inland dams and coastal lagoons predominate over marine fish in the diet. Freshwater prey is often taken at long distances from nest sites, presumably involving high energetic expenditure. Planned conservation actions aim at reducing disturbance and conflict with human interests through access management, building of artificial nests in areas of low angling quality, education and negotiation with local representatives; and at reducing foraging costs by providing new freshwater foraging sites closer to the coastline. As the management of habitat and its use by humans alone will predictably be insufficient, restocking the population with young from donor populations by hacking techniques is fundamental. |
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