La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Changing nesting dates and nest placement as adaptations of Aquatic Warbler Acrocephalus paludicola to unstable nesting conditions on fen mires in Belarus
Auteurs :	Lyubov Vergeichik, Auteur ; Alexander Kozulin, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (127(3) 2006)
Article en page(s) :	163-174
Résumé :	Between 1998 and 2005, several studies were undertaken into breeding phenology and nest placement of the Aquatic Warbler on the three largest fen mires in Belarus (Dikoe, Sporovo and Zvanets). These sites form the main breeding grounds of the species within its entire range. Nest placement in the first and second clutches (n = 191 nests) in different nesting conditions were as follows; standard placement under old vegetation 54.4%, in tussock hollows and holes 18.8%, under a canopy of only green vegetation 19.8% and in old sedge tangles above water 6.8% of nests. There are usually two periods of egg-laying, but it appears that only part of the females breed in both periods and others produce only one clutch in either period. However, when nesting conditions are unfavourable females shift the timing of breeding quite freely, and in certain years all females nest within a single short period. Major factors determining the timing of breeding and the way of nest placement of Aquatic Warbler water level fluctuations and changes in the composition of vegetation due to fires and water levels.

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