Migration patterns of the Osprey Pandion haliaetus on the Eastern European–East African flyway

We analysed migration strategies of the Osprey Pandion haliaetus on the poorly studied Eastern European–East African flyway. Four adult birds were equipped with GPS-based satellite-transmitters or data-loggers in their breeding sites in Estonia (north-eastern Europe) and tracked to their wintering grounds in Africa and back, during up to six migration cycles. Departure times, migration routes, as well as wintering and stopover sites varied remarkably between individuals but not much between years. Stopovers (2–30 days) were made mostly in Europe and less in the Middle East (Turkey) and north-eastern Africa (Egypt). The Ospreys did not avoid flying long distances over the sea, and the sea was crossed four times during the night. The current study adds to current knowledge on Osprey migration and should help to concentrate actions on protecting important flyways and stopover locations.     

Distribution pattern of an expanding Osprey ( Pandion haliaetus) population in a changing environment

We studied the nest site selection and distribution pattern at landscape level of the German Osprey population, and demonstrated how to test the predictions of the ideal free distribution theory and its derivatives on such an expanding population. Information about the location and breeding success of each Osprey nest site between 1995 and 2005 was collected through a long-term monitoring programme. Data of land cover types were acquired from the administrations of each federal state and the CORINE Land Cover database. The results showed that Ospreys preferred landscapes with more water bodies and forests. Such sites were also occupied earlier and had higher local population density. However, in the study period of 11 years, there was a gradual shift from forest-dominated landscapes to agricultural land-dominated landscapes. The breeding success increased over time, with no difference in the breeding success between pairs nesting on trees and poles, whereas there was higher breeding success at nest sites surrounded by more agricultural land and less forest. The more efficient foraging in eutrophic lakes in agricultural landscapes was the most likely cause for the higher breeding success. The distribution pattern of the Ospreys did not match the resource allocation, which deviated from the models tested. We suggested that the proximate cues used for nest site selection mismatched site quality due to anthropogenic environmental changes.     

Archaeozoological records and distribution history of the osprey (Pandion haliaetus) in Central Europe

A review of the Holocene records of the osprey (Pandion haliaetus) in Central Europe indicates an immigration around 10,000 years BP at the latest. During the middle Holocene—9,000–5,000 years BP—the species seems to have been common in the south-western Baltic region and perhaps also in Switzerland, but scarce in the rest of Central Europe. After a complete lack of osprey remains for nearly 4,000 years up to medieval times, a few records again suggest a sporadic distribution of this species in the south-western Baltic. In early modern times, the osprey recolonised north-eastern Germany and, during the nineteenth and the first decades of the twentieth century, bred in colony-like densities. Because of relentless persecution and, later, contamination with pesticides, osprey populations collapsed. Recently, the Central European populations have been slowly increasing again. The significance of the subfossil findings is discussed and possible reasons for their scarcity are outlined.     

The role of age of first breeding in modeling raptor reintroductions

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