1South African National Biodiversity Institute, P.O. Box 754, Pretoria, 0001 South Africa
2Department of Genetics, University of the Free State, P.O. Box 339, Bloemfontein, 9300 South Africa
3Area Avifauna Migratrice, Istituto Superiore per la Protezione e la Ricerca Ambientale, via Ca’ Fornacetta 9, I-40064 Ozzano Emilia, BO Italy
4Departament de Genètica, Universitat de Barcelona, Gran Via de les Corts Catalanes, 585, 08007 Barcelona, Spain
5Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona, Gran Via de les Corts Catalanes, 585, 08007 Barcelona, Spain
6Dipartimento di Scienze e Politiche Ambientali, Università degli Studi di Milano, via Celoria 26, Milan, I-20133 Italy
7Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, Milan, I-20133 Italy
8Departament de Biologia Evolutiva, Universitat de Barcelona, Gran Via de les Corts Catalanes, 585, 08007 Barcelona, Spain
9Istituto di Ricerca sulle Acque, IRSA-CNR, Via del Mulino 19, I-20861 Brugherio, (MB) Italy
10Max Planck Research Group Behavioural Genomics, Max Planck Institute for Evolutionary Biology, 24306 Plön, Germany
11Institute of Avian Research, An der Vogelwarte 21, 26386 Wilhelmshaven, Germany
12School of Health and Life Sciences, Teesside University, Middlesbrough, TS1 3BA UK
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