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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The status and breeding biology of the Osprey Pandion haliaetus in the Middle East
Auteurs :	Paul R. Fisher, Auteur ; Stephen F. Newton, Auteur ; Hany M. A. Tatwany, Auteur ; Chris R. Goldspink, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (122(3-4) 2001)
Article en page(s) :	191-204
Résumé :	The breeding range of the Osprey in the Middle East spans all coastlines and seas surrounding the Arabian Peninsula. Overall, the population is estimated at 1400 pairs, with the majority nesting on islands in the Red Sea, whereas the mainland coast of the Arabian Sea in southern Yemen and Oman is sparsely inhabited by breeding birds. In all areas, nesting occurs during the cooler winter months, with the first eggs laid November and December. The breeding success of 44 and 82 Osprey pairs on the Farasan Islands, southern Red Sea, was monitored over two breeding seasons, in 1994-95 and 1995-96 respectively. Clutch size ranged from 2-4 with a mean of 2.8 (+-0.1 s.d.) eggs, on average 2.0 hatchlings and 1.7 fledglings per active nest (pooled data). Fledging success was significantly higher, 2.6 fledglings per nest, for polyandrous breeding groups (3-4 adults present) than for monogamous pairs. Breeding failure was most pronounced during the egg laying - incubation period, with 27% of eggs laid (pooled data, n=76 clutches) failing to hatch, and 17% of hatchlings failing to fledge. The average growth rate (logistic model) for the nestlings was k=1.72 day-1. Brood sex ratios were biased toward males, with 87% of first hatchlings sexed as males from body measurements. The ecology and conservation of the Osprey are discussed with regard to the known threats for this species and breeding requirements in the Middle East region.

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