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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Spring migration, late arrival, temporary change of partner and breeding success in the Lesser Spotted Eagle Aquila pomarina.
Auteurs :	B.-U. Meyburg, Auteur ; C. Meyburg, Auteur ; J. Matthes, Auteur ; H. Matthes, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (128(1) 2007)
Article en page(s) :	21-31
Résumé :	With the help of satellite telemetry (ST) the complete spring migration route of a Lesser Spotted Eagle from winter quarters to breeding site, including all overnight stops, was documented in detail for the first time. A female fitted with transmitter left its winter quarters in the Kruger National Park, South Africa, on 21(st) February 1998 and 64 days later, on 25(th) April, arrived late at the breeding site in Germany. During 51 days it covered on average 211 km (min. 18, max. 406 km/day). Between times it rested for 13 days. The arrival of the female at the breeding site was observed directly. This enabled, for the first time, proof of a temporary partner change. The female (fitted with a transmitter) from the previous year immediately ousted a new female that had already paired with the last year's male.Punctual arrival at the breeding site is one of the decisive factors governing whether adult breeding takes place. it has been repeatedly recorded in various countries over the past few years that a large number of adult Lesser Spotted Eagles arrived so late in spring that eggs were not laid. We believe that in many cases, as with the individuals with transmitters, late departure from winter quarters was the reason for the delay and not unsuitable weather en route. One possible explanation is the strongly reduced precipitation in the over-wintering regions in southern Africa as a consequence of the El Nino climatic phenomenon. This has probably resulted in a reduced prey density for the Lesser Spotted Eagle, perhaps forcing the birds to remain longer in their winter quarters in order to build up the necessary energy reserves for migration. It is essential that this question is further studied as it is important for breeding success and consequently population development.

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