La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Digital video aerial surveys of Red-throated Diver in the Outer Thames Estuary SPA (2019)
Auteurs :	Martin Scott, Auteur ; Andy Webb, Auteur ; Catherine Irwin, Auteur ; Richard Caldow, Auteur
Type de document :	Article
Dans :	British Birds (112(6) JUN 2019)
Article en page(s) :	349-357
Résumé :	The Outer Thames Estuary Special Protection Area (SPA) was classified in 2010 in recognition of its importance for wintering Red-throated Diver Gavia stellata, a species listed in Annex I of the EU Birds Directive. At classification in 2010 the SPA was estimated to hold 6,466 individuals on the basis of visual aerial surveys between 1989 and 2006/07. Aerial surveys using digital photography in January and February 2013 produced a revised peak population estimate of 14,161 individuals. A new survey, carried out in early 2018 and reported here, used high resolution digital video imagery and generated a peak population estimate of 22,280 birds (95% CI 15,611-29,784). This confirms that the Outer Thames Estuary SPA supports by far the largest aggregation of non-breeding Red-throated Divers in UK waters.

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