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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Distributional ecology of individually radio-marked Knots Calidris canutus in the western Dutch Wadden Sea in August-October 1999] (2000)
Auteurs :	Jan van Gils, Auteur ; Theunis Piersma, Auteur ; Anne Dekinga, Auteur ; Bernard Spaans, Auteur
Type de document :	Article
Dans :	Limosa (73(1) 2000)
Article en page(s) :	29-34
Résumé :	This is a progress report on a study in 1999 during which we marked 45 wing-moulting Knots at Richel in early August and then followed their tide-induced movements in the western Dutch Wadden Sea by using 14 strategically placed automatic recording stations. We can confirm that Knots foraged by day and by night, but were also able to show subtle differences in the use of foraging and roosting areas. For example, an area where the birds were probably visually hunting for shorecrabs and shrimp was mostly visited during the day, whereas an area where buried bivalves formed the diet (that can be found by their exquisite 'remote'-detection mechanism), Knots were present in greatest numbers during the night. Analysis of the details of movement of a single individual showed it to usually forage on the intertidal flats just east of Griend, whereas it roosted either on the high flats near Griend (during tides when the high water level was low) or extensive sandbank Richel (during spring tides). That this Knot (and many of its mates) avoided roosting on Griend is explained by the presence of Peregrines Falco peregrinus and the many possibilities of surpise attacks at this site.

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