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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The importance of salt-marsh wetness for seed exploitation by dabbling ducks Anas sp.
Auteurs :	Ole R. Therkildsen, Auteur ; Thomas Bregnballe, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (147(4) OCT 2006)
Article en page(s) :	591-598
Langues:	Anglais
Résumé :	The relationship between the inundation of a salt marsh in southeast Denmark not subject to lunar tides and the availability and predation of seeds of the annuals Salicornia spp. and Suaeda maritima by autumn staging dabbling ducks was studied by carrying out exclosure experiments over the course of 2 years. There was a marked difference in the wetness of the salt marsh between the two study years, which resulted in distinct temporal patterns of salt-marsh use by dabbling ducks. In both years, the depletion of seeds of both Salicornia spp. and S. maritima was initiated subsequent to the flooding of the sample transects, which also induced the gradual release of seeds from the plants within the exclosures. Nevertheless, seeds were removed more rapidly in plots visited by dabbling ducks than in the exclosures. The predation of seeds took place as soon as the individual plants had been fully submerged, but before the seeds were released from the plants. The timing of flooding events during early autumn may potentially affect the availability of the salt-marsh seed stock. Therefore, weather conditions may impose critical constraints on the feeding opportunities for dabbling ducks during autumn migration on non-tidal salt marshes.

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