This is issue 23 of a serial publication with a selection of notable ring recoveries from the province of Groningen. Details of each ring recovery are given, often with a brief explanation of its importance. The previous issue was published in 2011. This issue is therefore an extended one. Presented are the first ring recoveries in Groningen of Shag Phalacrocorax aristotelis (photo 1), Bald Ibis Geronticus eremita (photos 2-3), Black Swan Cygnus atratus ( photo 4 ), Ruddy Shelduck Tadorna ferruginea (photo 5), Stonecurlew Burhinus oedicnemus and Dipper Cinclus cinclus. Figure 1 presents the staging areas and the presumed route of a Black Swan (blue 01A6, born nearby Roermond, photo 4) during a sweep through The Netherlands and northern Germany. Figure 2 presents the migration route and the staging areas during the non-breeding season of an Arctic Tern Sterna paradisaea with a geolocator (see Fijn et al. 2013 for details). The geolocator was deployed on a breeding bird trapped on the nest at Eemshaven on 3 June 2011. The bird of figure 2 was photographed landing on its nest at Eemshaven, half an hour before it was retrapped on 9 June 2012 (photo 13). The lightcoloured dots in figure 2 connect the interpolated lines between calculated locations during the autumn migration. The dark-coloured dots connect the lines between those locations during the spring migration. The large number of dots in the lower right part of the figure depicts the area where this bird spent most of its time between the autumn migration and the spring migration. This area is situated at sea in the Antarctic, off Dumont d’Urville (ca 140°E), ca 17,000 kms southeast of Eemshaven. Photo 14 depicts another Arctic Tern breeding at Eemshaven, which was deployed with a geolocator on 3 June 2011. The picture was taken one year after the geolocator was removed. The tracks revealed that the bird had used roughly the same migration route and staging areas as the other Arctic Terns. Its main staging area between both migration periods was at sea in the Antarctic east of Prydz Bay (ca 78°E).

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De Grauwe Gors

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Avifauna Groningen

Klaas van Dijk. (2015). Geringde vogels in Groningen, aflevering 23. De Grauwe Gors, 42(1), 70–83.