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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	White stork Ciconia ciconia survey in Pelagonia indicates a decrease in its breeding population and colony disintegration
Auteurs :	Borut Stumberger, Auteur ; Metodija Velevski, Auteur
Type de document :	Article
Dans :	Acrocephalus (23(112) 2002)
Article en page(s) :	67-74
Résumé :	In May 2002, a survey of the White Stork Ciconia ciconia was carried out in Pelagonia in the south of the Republic of Macedonia. In an area covering 1, 104 km(2), 223 breeding pairs (HPa), 7 unoccupied nests (H) and 5 breeding attempts (HB1 or HB2) were established. The largest colony (>= 5 HPa) numbered 20 pairs. In Pelagonian villages, White Storks breed as follows: 56.1% on buildings, 29.6% on pylons of the overhead transmission lines, 12.1% in trees, and 2.2% on stacks and bales of hay. The ecological density (StDBiol) reached 20.2 pairs/100 km(2). In comparison to the last survey by JOVETIC (1959) in 1958, the 2002 survey shows a 52.4% HPa decrease, and a decrease in the number of colonies from 27 to 15, as well as of colony size from 16.7 to 9.7 pairs per colony. The proportion of colonial breeders in the Pelagonian population has decreased from 92.9% to 65.0%, while the proportion of solitary breeders (1HPa/village) has risen from 2.1% in 1958 to 18.8% in 2002. White Stork colonies have drastically declined from the land claimed areas in southern Pelagonia. In northern and central Pelagonia, where extensive grazing and mowing is still practised, the numbers of breeding pairs (HPa) and colonies were found to be the same in both surveys: the decline in colony size from 14.5 to 9.7 pairs per colony has been compensated by the increased number of solitary breeders. The population decrease and the disintegration of White Stork colonies in Pelagonia indicate a general negative trend in Macedonia. An extensive reconstruction of overhead transmission lines in Pelagonia that is utterly at variance with nature conservation will only hasten the process of colony disintegration and decline of the population.

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