La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Changes in the timing and pattern of arrival of the White Stork (Ciconia ciconia) in western Poland
Auteurs :	J. Ptaszyk, Auteur ; J. Kosicki, Auteur ; T. H. Sparks, Auteur ; P. Tryjanowski, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (144(3) JUL 2003)
Article en page(s) :	323-329
Langues:	Anglais
Résumé :	Changes in the spring arrival dates of migrant birds, particularly passerines, have been -reported from a range of locations. In this paper we take the opportunity provided by a -detailed monitoring scheme to examine several features of the timing and arrival pattern of White Storks (Ciconia ciconia) in Poznan province, western Poland during the period 1983 - 2002. In doing so, we address several criticisms associated with the use of first -arrival dates. We found no evidence of a weekend bias to phenological recording and, unlike in some other species, found no effect of population size on recorded arrival date. Some aspects of the arrival pattern got earlier over time and first arrival appears to have been about 10 days earlier in the last 20 years than in the previous century. Earlier arrival was associated with warmer spring weather and with a protracted arrival period. From our experience with this study, we suggest how the general public can be used to collect high quality phenological data.

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