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Titre :	The autumn migration of soaring birds at Bourgas Bay, Bulgaria
Auteurs :	Tanyo Michev, Auteur ; Lyubomir Profirov, Auteur ; Konstantin Nyagolov, Auteur ; Milko Dimitrov, Auteur
Type de document :	Article
Dans :	British Birds (104(1) JAN 2011)
Article en page(s) :	16-37
Résumé :	The results of a survey of the autumn migration of soaring birds via the western Black Sea migration route ('Via Pontica'), at Bourgas Bay, Bulgaria, are presented here, for five species of waterbird and 33 species of raptor. Visual observations were carried out on 1,640 days in August, September and October between 1979 and 2003. The mean number of migrating waterbirds logged in autumn during the survey was 169,072 individuals (max. 250,623 in 1999), and the corresponding figure for migrant raptors was 38,534 (max. 65,065 in 1990). These data confirm that Bourgas Bay is one of the most important sites for monitoring the migration of soaring birds in Europe, and the most important for the autumn migration of several species, including White Pelican Pelecanus onocrotalus, Dalmatian Pelican P. crispus, White Stork Ciconia ciconia, harriers Circus, Levant Sparrowhawk Accipiter brevipes, Lesser Spotted Eagle Aquila pomarina and Red-footed Falcon Falco vespertinus. For a majority of the main species, the numbers recorded were either stable or increased over the study period, although eight species showed a declining trend. The data collected during 20 years of the Bourgas survey provide the opportunity to track long-term changes in the populations of migrant waterbirds and raptors in eastern Europe.

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