Grey Seal Numbers in the Wadden Sea and on Helgoland in 2013-2014

The German and Dutch Wadden Sea areas were surveyed for grey seals (Halichoerus grypus) by means of coordinated aerial and boat counts during the pupping season (November-January). On Helgoland (Germany), surveys were carried out from land. Furthermore, dedicated grey seal aerial surveys were carried out during the moulting period (March-April) in the German and Dutch Wadden Sea. In the Danish Wadden Sea grey seals were only counted during the summer counts for harbour seals (Phoca vitulina).

Authors: 

Trilateral Seal Expert Group (TSEG)

Sophie Brasseur, Richard Czeck, Britta Diederichs, Anders Galatius, Lasse Fast Jensen, Peter Körber, Ursula Siebert, Jonas Teilmann, Sascha Klöpper